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\/>\n<h2>\u5171\u4eab\u5185\u5b58<\/h2>\n<p>\u90a3\u4e48\u6b64\u524d\u6211\u4eec\u5df2\u7ecf\u5b66\u4e60\u4e86\u4e24\u79cd\u901a\u4fe1\u65b9\u5f0f&#xff0c;\u5206\u522b\u662f\u533f\u540d\u7ba1\u9053\u4ee5\u53ca\u547d\u540d\u7ba1\u9053\u6765\u5b9e\u73b0\u8fdb\u7a0b\u7684\u901a\u4fe1&#xff0c;\u90a3\u4e48\u8fd9\u671f\u535a\u5ba2&#xff0c;\u6211\u4fbf\u4f1a\u4ecb\u7ecd\u7b2c\u4e09\u79cd\u901a\u4fe1\u65b9\u5f0f&#xff0c;\u4fbf\u662f\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u6211\u4f1a\u4ece\u4e09\u4e2a\u7ef4\u5ea6\u6765\u89e3\u6790\u5171\u4eab\u5185\u5b58&#xff0c;\u5206\u522b\u662f\u4ec0\u4e48\u662f\u5171\u4eab\u5185\u5b58\u4ee5\u53ca\u5171\u4eab\u5185\u5b58\u7684\u5e95\u5c42\u76f8\u5173\u7684\u539f\u7406\u548c\u7ed3\u5408\u524d\u9762\u4e24\u4e2a\u7ef4\u5ea6\u7684\u7406\u8bba\u77e5\u8bc6&#xff0c;\u5982\u4f55\u5229\u7528\u5171\u4eab\u5185\u5b58\u6765\u5b9e\u73b0\u8fdb\u7a0b\u7684\u901a\u4fe1&#xff0c;\u4e5f\u5c31\u662f\u6587\u7ae0\u7684\u672b\u5c3e\u6211\u4eec\u4f1a\u5199\u4e00\u4e2a\u7528\u5171\u4eab\u5185\u5b58\u5b9e\u73b0\u901a\u4fe1\u7684\u5c0f\u9879\u76ee<\/p>\n<h3>\u4ec0\u4e48\u662f\u5171\u4eab\u5185\u5b58\u4ee5\u53ca\u5171\u4eab\u5185\u5b58\u7684\u5e95\u5c42\u539f\u7406<\/h3>\n<p>\u90a3\u4e48\u6211\u4eec\u77e5\u9053\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u6838\u5fc3\u601d\u60f3\u5c31\u662f\u901a\u8fc7\u5f00\u8f9f\u4e00\u5757\u516c\u5171\u7684\u533a\u57df&#xff0c;\u7136\u540e\u8ba9\u8fdb\u7a0b\u53cc\u65b9\u80fd\u591f\u770b\u5230\u8fd9\u4efd\u8d44\u6e90\u4ece\u800c\u5b9e\u73b0\u901a\u4fe1&#xff0c;\u6240\u4ee5\u8fd9\u91cc\u7684\u5171\u4eab\u5185\u5b58\u5176\u5b9e\u672c\u8d28\u5c31\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u5176\u901a\u4fe1\u8fdb\u7a0b\u53cc\u65b9\u5206\u914d\u7684\u4e00\u4e2a\u7269\u7406\u5185\u5b58&#xff0c;\u90a3\u4e48\u8fd9\u4efd\u7269\u7406\u5185\u5b58\u5c31\u662f\u5171\u4eab\u5185\u5b58&#xff0c;\u6240\u4ee5\u5171\u4eab\u5185\u5b58\u7684\u6982\u5ff5\u5176\u5b9e\u5f88\u7b80\u5355\u4e0e\u76f4\u63a5<\/p>\n<p>\u6839\u636e\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u6838\u5fc3\u601d\u60f3&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u7684\u516c\u5171\u7684\u533a\u57df\u5df2\u7ecf\u6709\u4e86&#xff0c;\u90a3\u4e48\u4e0b\u4e00\u6b65\u64cd\u4f5c\u7cfb\u7edf\u8981\u89e3\u51b3\u7684\u95ee\u9898\u4fbf\u662f\u521b\u5efa\u597d\u4e86\u5171\u4eab\u5185\u5b58&#xff0c;\u5982\u4f55\u8ba9\u8fdb\u7a0b\u53cc\u65b9\u80fd\u591f\u770b\u5230\u8fd9\u4efd\u5171\u4eab\u5185\u5b58\u8d44\u6e90<\/p>\n<p>\u90a3\u4e48\u5bf9\u4e8e\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u6309\u7167\u8fdb\u7a0b\u7684\u89c6\u89d2&#xff0c;\u90a3\u4e48\u5b83\u624b\u5934\u4e0a\u53ea\u6301\u6709\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u8fdb\u7a0b\u8bbf\u95ee\u5404\u79cd\u6570\u636e\u90fd\u53ea\u80fd\u901a\u8fc7\u865a\u62df\u5730\u5740\u53bb\u8bbf\u95ee&#xff0c;\u7136\u540e\u7cfb\u7edf\u518d\u501f\u52a9\u9875\u8868\u5c06\u865a\u62df\u5730\u5740\u8f6c\u6362\u4e3a\u7269\u7406\u5730\u5740\u4ece\u800c\u8bbf\u95ee\u5230\u76f8\u5173\u6570\u636e&#xff0c;\u6240\u4ee5\u8981\u8ba9\u901a\u4fe1\u8fdb\u7a0b\u53cc\u65b9\u770b\u5230\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u6b64\u65f6\u64cd\u4f5c\u7cfb\u7edf\u7684\u4efb\u52a1\u5c31\u662f\u63d0\u4f9b\u7ed9\u901a\u4fe1\u8fdb\u7a0b\u53cc\u65b9\u5404\u81ea\u4e00\u4e2a\u6307\u5411\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740&#xff0c;\u7136\u540e\u901a\u4fe1\u8fdb\u7a0b\u53cc\u65b9\u5c31\u53ef\u4ee5\u901a\u8fc7\u8be5\u865a\u62df\u5730\u5740\u6765\u5411\u5171\u4eab\u5185\u5b58\u4e2d\u5199\u5165\u4ee5\u53ca\u8bfb\u53d6\u6570\u636e\u4e86&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u64cd\u4f5c\u7cfb\u7edf\u8981\u8fdb\u884c\u7684\u5de5\u4f5c&#xff0c;\u5c31\u662f\u521b\u5efa\u901a\u4fe1\u7684\u8fdb\u7a0b\u7684\u540c\u65f6&#xff0c;\u8bbe\u7f6e\u597d\u8be5\u8fdb\u7a0b\u5bf9\u5e94\u7684mm_struct\u7ed3\u6784\u4f53\u4e2d\u7684\u5171\u4eab\u5185\u5b58\u6bb5&#xff0c;\u5e76\u4e14\u5728\u5176\u5bf9\u5e94\u7684\u9875\u8868\u6dfb\u52a0\u5176\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u7684\u6761\u76ee<\/p>\n<p>\u90a3\u4e48\u77e5\u9053\u4e86\u5171\u4eab\u5185\u5b58\u6765\u5b9e\u73b0\u8fdb\u7a0b\u53cc\u65b9\u901a\u4fe1\u7684\u4e00\u4e2a\u5927\u81f4\u7684\u539f\u7406&#xff0c;\u90a3\u4e48\u73b0\u5728\u7684\u95ee\u9898\u5c31\u662f\u5982\u4f55\u8bf7\u6c42\u8ba9\u64cd\u4f5c\u7cfb\u7edf\u6765\u4e3a\u8be5\u901a\u4fe1\u8fdb\u7a0b\u53cc\u65b9\u521b\u5efa\u5171\u4eab\u5185\u5b58<\/p>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5c31\u8981\u8ba9\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u8be5\u5176\u521b\u5efa\u4e00\u4efd\u5171\u4eab\u5185\u5b58&#xff0c;\u5c31\u9700\u8981\u6211\u4eec\u5728\u4ee3\u7801\u5c42\u9762\u4e0a\u8c03\u7528shmget\u63a5\u53e3&#xff0c;\u90a3\u4e48\u8be5\u63a5\u53e3\u7684\u4f5c\u7528\u5c31\u662f\u8ba9\u5185\u6838\u4e3a\u6211\u4eec\u521b\u5efa\u4e00\u4efd\u5171\u4eab\u5185\u5b58&#xff0c;\u4f46\u662f\u5728\u4ecb\u7ecd\u8fd9\u4e2a\u63a5\u53e3\u5982\u4f55\u4f7f\u7528\u4e4b\u524d&#xff0c;\u6211\u4eec\u8fd8\u5f97\u8865\u5145\u4e00\u4e9b\u76f8\u5173\u7684\u7406\u8bba\u57fa\u7840&#xff0c;\u6709\u4e86\u8fd9\u4e9b\u7406\u8bba\u57fa\u7840&#xff0c;\u6211\u4eec\u624d\u80fd\u591f\u8ba4\u8bc6\u5230shmget\u8fd9\u4e9b\u53c2\u6570\u7684\u610f\u4e49\u662f\u4ec0\u4e48<\/p>\n<ul>\n<li>shmget<\/li>\n<li>\u5934\u6587\u4ef6&#xff1a;&lt;sys\/shm.h&gt; \u548c&lt;sys\/ipc.h&gt;<\/li>\n<li>\u51fd\u6570\u58f0\u660e&#xff1a;int shmget(ket_t key,size_t size,int shmflg);<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u8c03\u7528\u6210\u529f\u8fd4\u56deshmid&#xff0c;\u8c03\u7528\u5931\u8d25\u5219\u8fd4\u56de-1,\u5e76\u8bbe\u7f6eerrno<\/li>\n<\/ul>\n<h4>key\/shmid<\/h4>\n<p>\u90a3\u4e48\u8fd9\u91cc\u7684shmget\u7684\u4e00\u4e2a\u53c2\u6570\u5c31\u662f\u4e00\u4e2akey&#xff0c;\u90a3\u4e48\u8bfb\u8005\u5bf9\u4e8ekey\u7684\u7591\u95ee\u65e0\u975e\u5c31\u662f\u8fd9\u4e24\u4e2a\u65b9\u9762&#xff1a;\u8fd9\u4e2akey\u662f\u4ec0\u4e48?key\u7684\u4f5c\u7528\u662f\u4ec0\u4e48&#xff1f;<\/p>\n<p>\u90a3\u4e48\u63a5\u4e0b\u6765\u7684\u8bb2\u89e3\u4f1a\u4ee5\u8fd9\u4e24\u4e2a\u95ee\u9898\u4e3a\u6838\u5fc3&#xff0c;\u6765\u4e3a\u4f60\u89e3\u6790\u8fd9\u4e2akey\u7a76\u7adf\u662f\u4f55\u65b9\u795e\u5723<\/p>\n<p>\u9996\u5148\u6211\u4eec\u4e00\u5b9a\u8981\u6e05\u695a\u7684\u662f\u7cfb\u7edf\u4e2d\u5b58\u5728\u4e0d\u53ea\u6709\u4e00\u4e2a\u5171\u4eab\u5185\u5b58&#xff0c;\u56e0\u4e3a\u7cfb\u7edf\u4e2d\u9700\u8981\u901a\u4fe1\u7684\u8fdb\u7a0b\u4e0d\u53ea\u6709\u4e00\u5bf9&#xff0c;\u6240\u4ee5\u6b64\u65f6\u7cfb\u7edf\u4e2d\u7684\u5171\u4eab\u5185\u5b58\u5c31\u4e0d\u53ea\u6709\u4e00\u4e2a&#xff0c;\u90a3\u4e48\u7cfb\u7edf\u4e2d\u5b58\u5728\u8fd9\u4e48\u591a\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u6bcf\u4e00\u4e2a\u5171\u4eab\u5185\u5b58\u90fd\u4f1a\u6d89\u53ca\u5230\u521b\u5efa\u4ee5\u53ca\u8bfb\u53d6\u548c\u5199\u5165\u4ee5\u53ca\u6700\u540e\u7684\u9500\u6bc1&#xff0c;\u90a3\u4e48\u64cd\u4f5c\u7cfb\u7edf\u80af\u5b9a\u5c31\u8981\u7ba1\u7406\u5b58\u5728\u7684\u6240\u6709\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u7ba1\u7406\u7684\u65b9\u5f0f\u5c31\u662f\u6211\u4eec\u719f\u6089\u7684\u5148\u63cf\u8ff0\u518d\u7ec4\u7ec7\u7684\u65b9\u5f0f\u6765\u7ba1\u7406\u8fd9\u4e9b\u5171\u4eab\u5185\u5b58&#xff0c;\u4e5f\u5c31\u662f\u4e3a\u6bcf\u4e00\u4e2a\u5171\u4eab\u5185\u5b58\u521b\u5efa\u4e00\u4e2astruct shm_kernel\u7ed3\u6784\u4f53&#xff0c;\u90a3\u4e48\u8be5\u7ed3\u6784\u4f53\u5c31\u8bb0\u5f55\u4e86\u8be5\u5171\u4eab\u5185\u5b58\u7684\u76f8\u5173\u7684\u5c5e\u6027&#xff0c;\u6bd4\u5982\u5171\u4eab\u5185\u5b58\u7684\u5927\u5c0f\u4ee5\u53ca\u5171\u4eab\u5185\u5b58\u7684\u6743\u9650\u4ee5\u53ca\u6302\u8f7d\u65f6\u95f4\u7b49\u7b49&#xff0c;\u90a3\u4e48\u6bcf\u4e00\u4e2a\u5171\u4eab\u5185\u5b58\u90fd\u6709\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53&#xff0c;\u90a3\u4e48\u5185\u6838\u4f1a\u6301\u6709\u8fd9\u4e9b\u7ed3\u6784\u4f53&#xff0c;\u5e76\u4e14\u4f1a\u91c7\u53d6\u7279\u5b9a\u7684\u6570\u636e\u7ed3\u6784\u5c06\u8fd9\u4e9b\u7ed3\u6784\u4f53\u7ec4\u7ec7\u8d77\u6765&#xff0c;\u6bd4\u5982\u94fe\u8868\u6216\u8005\u54c8\u5e0c\u8868&#xff0c;\u90a3\u4e48\u7cfb\u7edf\u4e2d\u6bcf\u4e00\u4e2a\u5171\u4eab\u5185\u5b58\u80af\u5b9a\u662f\u4e0d\u76f8\u540c\u7684&#xff0c;\u90a3\u4e48\u4e3a\u4e86\u533a\u5206\u8fd9\u4e9b\u4e0d\u540c\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u7cfb\u7edf\u5c31\u5f97\u7ed9\u8fd9\u4e9b\u5171\u4eab\u5185\u5b58\u5206\u914d\u4e00\u4e2a\u6807\u8bc6\u7b26&#xff0c;\u901a\u8fc7\u6807\u8bc6\u7b26\u6765\u533a\u5206\u8fd9\u4e9b\u5171\u4eab\u5185\u5b58<\/p>\n<p>\u800c\u8fdb\u7a0b\u8981\u7528\u5171\u4eab\u5185\u5b58\u5b9e\u73b0\u901a\u4fe1&#xff0c;\u90a3\u4e48\u8fdb\u7a0b\u9996\u5148\u5f97\u8bf7\u6c42\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u6211\u4eec\u8be5\u8fdb\u7a0b\u521b\u5efa\u4e00\u4efd\u5171\u4eab\u5185\u5b58&#xff0c;\u7136\u540e\u83b7\u53d6\u5230\u6307\u5411\u8be5\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740&#xff0c;\u800c\u8fdb\u7a0b\u95f4\u7684\u901a\u4fe1&#xff0c;\u6d89\u53ca\u7684\u8fdb\u7a0b\u7684\u6570\u91cf\u81f3\u5c11\u4e3a\u4e24\u4e2a&#xff0c;\u90a3\u4e48\u4ee5\u4e24\u4e2a\u8fdb\u7a0b\u4e3a\u4f8b\u5b50&#xff0c;\u5047\u8bbe\u8fdb\u7a0bA\u548c\u8fdb\u7a0bB\u8981\u8fdb\u884c\u901a\u4fe1&#xff0c;\u90a3\u4e48\u6b64\u65f6\u9700\u8981\u4e3a\u8fd9\u5bf9\u8fdb\u7a0b\u63d0\u4f9b\u4e00\u4e2a\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u5c31\u9700\u8981A\u8fdb\u7a0b\u6216\u8005B\u8fdb\u7a0b\u544a\u8bc9\u64cd\u4f5c\u7cfb\u7edf\u6765\u4e3a\u5176\u521b\u5efa\u4e00\u4efd\u5171\u4eab\u5185\u5b58<\/p>\n<p>\u90a3\u4e48\u8fd9\u91cc\u4f60\u53ef\u4ee5\u770b\u5230\u6211\u5c06\u6216\u8005\u8fd9\u4e24\u4e2a\u5b57\u52a0\u7c97&#xff0c;\u90a3\u4e48\u5c31\u662f\u4e3a\u4e86\u544a\u8bc9\u8bfb\u8005&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u53ea\u9700\u8981\u4e00\u4e2a\u8fdb\u7a0b\u6765\u544a\u8bc9\u5185\u6838\u521b\u5efa\u4e00\u4efd\u5171\u4eab\u5185\u5b58&#xff0c;\u4e0d\u9700\u8981\u4e24\u4e2a\u8fdb\u7a0b\u90fd\u5411\u64cd\u4f5c\u7cfb\u7edf\u53d1\u51fa\u521b\u5efa\u5171\u4eab\u5185\u5b58\u7684\u8bf7\u6c42&#xff0c;\u6240\u4ee5\u53ea\u9700\u8981\u4e00\u4e2a\u8fdb\u7a0b\u8bf7\u6c42\u5185\u6838\u521b\u5efa\u4e00\u4efd\u5171\u4eab\u5185\u5b58&#xff0c;\u7136\u540e\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u76f4\u63a5\u8bbf\u95ee\u521b\u5efa\u597d\u7684\u5171\u4eab\u5185\u5b58\u5373\u53ef<\/p>\n<p>\u90a3\u4e48\u77e5\u9053\u4e86\u8fd9\u70b9\u4e4b\u540e&#xff0c;\u90a3\u4e48\u5047\u8bbe\u8fd9\u91cc\u521b\u5efa\u5171\u4eab\u5185\u5b58\u7684\u4efb\u52a1\u4ea4\u7ed9\u4e86A\u8fdb\u7a0b&#xff0c;\u90a3\u4e48\u6b64\u65f6A\u8fdb\u7a0b\u8bf7\u6c42\u5185\u6838\u521b\u5efa\u597d\u4e86\u4e00\u4efd\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u5bf9\u4e8eB\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u5b83\u5982\u4f55\u77e5\u9053\u83b7\u53d6\u5230A\u8fdb\u7a0b\u521b\u5efa\u597d\u7684\u5171\u4eab\u5185\u5b58\u5462&#xff0c;\u7531\u4e8e\u7cfb\u7edf\u5185\u5b58\u5728\u90a3\u4e48\u591a\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48B\u8fdb\u7a0b\u600e\u4e48\u77e5\u9053\u54ea\u4e00\u4e2a\u5171\u4eab\u5185\u5b58\u662fA\u8fdb\u7a0b\u521b\u5efa\u7684&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5c31\u9700\u8981key\u503c&#xff0c;\u90a3\u4e48\u8fd9\u4e2akey\u503c\u5c31\u662f\u5171\u4eab\u5185\u5b58\u7684\u6807\u8bc6\u7b26<\/p>\n<p>key\u5c31\u597d\u6bd4\u9152\u5e97\u623f\u95f4\u7684\u4e00\u4e2a\u95e8\u724c\u53f7&#xff0c;\u90a3\u4e48A\u548cB\u8fdb\u7a0b\u53ea\u9700\u8981\u5404\u81ea\u6301\u6709\u8be5\u623f\u95f4\u7684\u95e8\u724c\u53f7&#xff0c;\u90a3\u4e48\u5c31\u80fd\u591f\u627e\u5230\u8be5\u623f\u95f4&#xff0c;\u4f46\u662f\u8fd9\u91cc\u8981\u6ce8\u610f\u7684\u5c31\u662f\u8fd9\u91cc\u7684key\u503c\u4e0d\u662f\u7531\u5185\u6838\u81ea\u5df1\u751f\u6210\u7684&#xff0c;\u800c\u662f\u7531\u7528\u6237\u81ea\u5df1\u6765\u751f\u6210\u4e00\u4e2akey\u503c<\/p>\n<p>\u90a3\u4e48\u6709\u4e9b\u8bfb\u8005\u53ef\u80fd\u5c31\u4f1a\u611f\u5230\u7591\u95ee&#xff0c;\u90a3\u4e48\u6807\u8bc6\u7b26\u8fd9\u4e2a\u6982\u5ff5\u5bf9\u4e8e\u5927\u90e8\u5206\u7684\u8bfb\u8005\u6765\u8bf4\u90fd\u4e0d\u4f1a\u611f\u5230\u964c\u751f&#xff0c;\u65e9\u5728\u5b66\u4e60\u8fdb\u7a0b\u7684\u65f6\u5019&#xff0c;\u6211\u4eec\u5c31\u5df2\u7ecf\u63a5\u89e6\u5230\u6807\u8bc6\u7b26\u8fd9\u4e2a\u6982\u5ff5&#xff0c;\u90a3\u4e48\u5bf9\u5185\u6838\u4e3a\u4e86\u7ba1\u7406\u8fdb\u7a0b&#xff0c;\u90a3\u4e48\u4f1a\u4e3a\u6bcf\u4e00\u4e2a\u8fdb\u7a0b\u5206\u914d\u4e00\u4e2a\u6807\u8bc6\u7b26&#xff0c;\u90a3\u4e48\u5c31\u662f\u8fdb\u7a0b\u7684PID&#xff0c;\u800c\u5728\u6587\u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\/>\n<p>\u90a3\u4e48\u63a5\u4e0b\u6765\u6211\u5c31\u6765\u4f9d\u6b21\u89e3\u7b54\u8bfb\u8005\u7684\u8fd9\u4e9b\u7591\u95ee&#xff0c;\u90a3\u4e48\u9996\u5148\u5173\u4e8e\u4e3a\u4ec0\u4e48\u6211\u4eec\u8fdb\u7a0b\u53cc\u65b9\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u901a\u8fc7shmid\u6765\u8bbf\u95ee\u5185\u5b58<\/p>\n<p>\u90a3\u4e48\u6211\u4eec\u77e5\u9053\u5185\u6838\u5728\u521b\u5efa\u5171\u4eab\u5185\u5b58\u7684\u540c\u65f6\u4f1a\u4e3a\u8be5\u5171\u4eab\u5185\u5b58\u521b\u5efa\u5bf9\u5e94\u7684struct 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efb\u610f\u4e00\u4e2a\u65e0\u7b26\u53f7\u7684\u6574\u5f62\u4f5c\u4e3akey&#xff0c;\u4f46\u662f\u8981\u6ce8\u610f\u7684\u5c31\u662f\u7531\u4e8e\u8fd9\u91cckey\u662f\u7528\u6237\u81ea\u5df1\u751f\u6210\u81ea\u5df1\u51b3\u5b9a\u7684&#xff0c;\u90a3\u4e48\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u8fd9\u6837\u7684\u573a\u666f&#xff0c;\u90a3\u4e48\u5c31\u662f\u7528\u6237\u81ea\u5df1\u751f\u6210\u7684key\u548c\u5df2\u7ecf\u521b\u5efa\u597d\u7684\u5171\u4eab\u5185\u5b58\u7684key\u7684\u503c\u4e00\u6837\u6216\u8005\u8bf4\u51b2\u7a81&#xff0c;\u6240\u4ee5\u8fd9\u91cc\u7cfb\u7edf\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86ftok\u51fd\u6570&#xff0c;\u90a3\u4e48\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5c31\u662fkey\u503c&#xff0c;\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u4e0d\u8c03\u7528\u8be5\u51fd\u6570&#xff0c;\u81ea\u5df1\u968f\u4fbf\u751f\u6210\u4e00\u4e2akey\u503c&#xff0c;\u4f46\u662f\u9020\u6210\u51b2\u7a81\u7684\u540e\u679c\u5c31\u5f97\u81ea\u5df1\u627f\u62c5&#xff0c;\u6240\u4ee5\u8fd9\u91cc\u66f4\u63a8\u8350\u8c03\u7528ftok\u51fd\u6570\u751f\u6210\u4e00\u4e2akey\u503c<\/p>\n<p>\u8fd9\u91cc\u63a8\u8350\u4f7f\u7528ftok\u51fd\u6570\u6765\u751f\u6210\u7684key&#xff0c;\u4e0d\u662f\u56e0\u4e3aftok\u51fd\u6570\u751f\u6210\u7684key\u5b8c\u5168\u4e0d\u4f1a\u4e0e\u5b58\u5728\u7684\u5171\u4eab\u5185\u5b58\u7684key\u9020\u6210\u51b2\u7a81&#xff0c;\u800c\u662f\u56e0\u4e3a\u5176\u51b2\u7a81\u7684\u6982\u7387\u76f8\u6bd4\u4e8e\u6211\u4eec\u81ea\u5df1\u968f\u624b\u751f\u6210\u4e00\u4e2a\u7684key\u662f\u5f88\u4f4e\u7684<\/p>\n<ul>\n<li>ftok<\/li>\n<li>\u5934\u6587\u4ef6&#xff1a;&lt;sys\/types.h&gt; \u548c&lt;sys\/ipc.h&gt;<\/li>\n<li>\u51fd\u6570\u58f0\u660e&#xff1a;key_t ftok(const char* pathname,int proj_id);<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u8c03\u7528\u6210\u529f\u8fd4\u56dekey\u503c&#xff0c;\u8c03\u7528\u5931\u8d25\u5219\u8fd4\u56de-1<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u8fd9\u91ccftok\u4f1a\u63a5\u6536\u4e24\u4e2a\u53c2\u6570&#xff0c;\u9996\u5148\u662f\u4e00\u4e2a\u6587\u4ef6\u7684\u8def\u5f84\u540d\u4ee5\u53ca\u6587\u4ef6\u540d&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6ce8\u610f\u7684\u5c31\u662f\u8fd9\u91cc\u7684\u6587\u4ef6\u7684\u8def\u5f84\u540d\u4ee5\u53ca\u6587\u4ef6\u540d\u4e00\u5b9a\u662f\u7cfb\u7edf\u4e2d\u5b58\u5728\u7684\u6587\u4ef6&#xff0c;\u56e0\u4e3a\u5b83\u4f1a\u89e3\u6790\u8fd9\u4e2a\u8def\u5f84\u4ee5\u53ca\u6587\u4ef6\u540d\u4ece\u800c\u83b7\u53d6\u8be5\u6587\u4ef6\u7684inode\u7f16\u53f7&#xff0c;\u7136\u540e\u5f97\u5230\u5bf9\u5e94\u7684inode\u7ed3\u6784\u4f53&#xff0c;\u4ece\u4e2d\u518d\u83b7\u53d6\u5176\u8bbe\u5907\u7f16\u53f7&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u7684proj_id\u7684\u4f5c\u7528\u5c31\u662f\u7528\u6765\u964d\u4f4e\u51b2\u7a81\u7684\u6982\u7387&#xff0c;\u56e0\u4e3a\u5230\u65f6\u5019ftok\u51fd\u6570\u83b7\u53d6\u5230\u6587\u4ef6\u7684inode\u7f16\u53f7\u4ee5\u53ca\u8bbe\u5907\u53f7\u548cproj_id&#xff0c;\u7136\u540e\u4f1a\u8fdb\u884c\u4f4d\u8fd0\u7b97&#xff0c;\u5f97\u5230\u4e00\u4e2a32\u4f4d\u7684\u65e0\u7b26\u53f7\u6574\u5f62&#xff0c;\u90a3\u4e48\u5176\u4f4d\u8fd0\u7b97\u5c31\u662f&#xff1a; ftok \u901a\u8fc7\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u751f\u6210 key \u7684\u7b97\u6cd5\u5982\u4e0b&#xff1a;<\/p>\n<p>key <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>st_dev <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">0xFF<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">24<\/span> <span class=\"token operator\">|<\/span> <span class=\"token punctuation\">(<\/span>st_ino <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">0xFFFF<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">8<\/span> <span class=\"token operator\">|<\/span> <span class=\"token punctuation\">(<\/span>proj_id <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">0xFF<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u2022 st_dev&#xff1a;\u6587\u4ef6\u6240\u5728\u8bbe\u5907\u7684\u8bbe\u5907\u53f7&#xff08;\u53d6\u4f4e8\u4f4d&#xff09;<\/p>\n<p>\u2022 st_ino&#xff1a;\u6587\u4ef6\u7684inode\u7f16\u53f7&#xff08;\u53d6\u4f4e16\u4f4d&#xff09;<\/p>\n<p>\u2022 proj_id&#xff1a;\u7528\u6237\u6307\u5b9a\u7684\u9879\u76eeID&#xff08;\u53d6\u4f4e8\u4f4d&#xff09;<\/p>\n<h4>\u5171\u4eab\u5185\u5b58\u7684\u5927\u5c0f<\/h4>\n<p>\u90a3\u4e48shmget\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4fbf\u662f\u6307\u5b9a\u7684\u5c31\u662f\u5171\u4eab\u5185\u5b58\u7684\u5927\u5c0f&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u81f3\u4e8e\u5185\u6838\u5728\u7533\u8bf7\u5206\u914d\u7269\u7406\u5185\u5b58\u7684\u5355\u4f4d\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d&#xff0c;\u4e5f\u5c31\u662f\u4ee54KB\u4e3a\u5355\u4f4d\u6765\u5206\u914d\u7269\u7406\u5185\u5b58&#xff0c;\u800c\u8fd9\u91ccshmget\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u5efa\u8bae\u6211\u4eec\u5f00\u8f9f\u7684\u5171\u4eab\u5185\u5b58\u662f\u4ee54096\u7684\u6574\u6570\u500d\u6765\u5f00\u8f9f&#xff0c;\u56e0\u4e3a\u5047\u8bbe\u4f60\u7533\u8bf7\u4e00\u4e2a4097\u4e2a\u5b57\u8282&#xff0c;\u90a3\u4e48\u6b64\u65f6\u5185\u6838\u5b9e\u9645\u4e0a\u4e3a\u4f60\u5206\u914d\u7684\u7269\u7406\u5185\u5b58\u662f2*4096&#xff0c;\u4e5f\u5c31\u662f8kb\u7684\u7a7a\u95f4&#xff0c;\u867d\u7136\u4eba\u5bb6\u5185\u6838\u7ed9\u4f60\u5206\u914d\u4e868kb\u7684\u7a7a\u95f4&#xff0c;\u4f46\u662f\u5b83\u53ea\u5141\u8bb8\u4f60\u4f7f\u7528\u5176\u4e2d\u76844097\u4e2a\u5b57\u8282&#xff0c;\u4e5f\u5c31\u662f\u5269\u4e0b\u7684\u7a7a\u95f4\u5c31\u5168\u90e8\u6d6a\u8d39\u4e86&#xff0c;\u6240\u4ee5\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5efa\u8bae\u7533\u8bf7\u7684\u7a7a\u95f4\u5927\u5c0f\u662f4096\u7684\u6574\u6570\u500d&#xff0c;\u90a3\u4e48\u8fd9\u5c31\u662fshmget\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570<\/p>\n<h4>shmget\u7684\u5b8f<\/h4>\n<p>\u90a3\u4e48shmget\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u4fbf\u662f\u5b8f\u6765\u6307\u5b9a\u5176\u884c\u4e3a&#xff0c;\u90a3\u4e48\u4e0a\u6587\u6211\u4eec\u5c31\u57cb\u4e86\u4e00\u4e2a\u4f0f\u7b14&#xff0c;\u5c31\u662f\u4e24\u4e2a\u8fdb\u7a0b\u90fd\u8c03\u7528\u4e86shmget\u4f46\u662f\u5374\u6709\u7740\u4e0d\u540c\u7684\u884c\u4e3a&#xff0c;\u90a3\u4e48\u5c31\u548c\u8fd9\u91cc\u7684\u5b8f\u6709\u5173&#xff1a;<\/p>\n<ul>\n<li>IPC_CREAT (01000)&#xff1a;\u5982\u679c\u5171\u4eab\u5185\u5b58\u4e0d\u5b58\u5728\u5219\u521b\u5efa<\/li>\n<li>IPC_EXCL (02000)&#xff1a;\u4e0d\u80fd\u5355\u72ec\u4f7f\u7528&#xff0c;\u4e0eIPC_CREAT\u4e00\u8d77\u4f7f\u7528&#xff0c;\u82e5\u5171\u4eab\u5185\u5b58\u5df2\u5b58\u5728\u5219\u5931\u8d25<\/li>\n<li>SHM_HUGETLB (04000)&#xff1a;\u4f7f\u7528\u5927\u9875\u5185\u5b58&#xff08;Linux\u7279\u6709&#xff09;<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u7740\u91cd\u8981\u638c\u63e1\u7684\u4fbf\u662fIPC_CREAT\u4ee5\u53caIPC_EXEC\u8fd9\u4e24\u4e2a\u5b8f IPC_CREAT: \u90a3\u4e48\u4f20\u9012IPC_CREAT\u8fd9\u4e2a\u5b8f\u7ed9shmget\u63a5\u53e3&#xff0c;\u5176\u5e95\u5c42\u6d89\u53ca\u5230\u5de5\u4f5c&#xff0c;\u5c31\u662f\u5185\u6838\u9996\u5148\u4f1a\u6301\u6709\u6211\u4eec\u4f20\u9012\u7684key\u503c&#xff0c;\u7136\u540e\u53bb\u904d\u5386\u7ec4\u7ec7\u6240\u6709\u5171\u4eab\u5185\u5b58\u7684\u7ed3\u6784\u4f53\u7684\u6570\u636e\u7ed3\u6784&#xff0c;\u5982\u679c\u904d\u5386\u5b8c\u4e86\u6240\u6709\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53\u5e76\u4e14\u53d1\u73b0\u6ca1\u6709\u5339\u914d\u7684key\u503c&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5171\u4eab\u5185\u5b58\u5e76\u4e14\u540c\u65f6\u521b\u5efa\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53&#xff0c;\u7136\u540e\u5bf9\u5176\u7ed3\u6784\u4f53\u7684\u5c5e\u6027\u8fdb\u884c\u521d\u59cb\u5316\u5176\u4e2d\u5c31\u5305\u62ec\u586b\u5165key\u503c\u5e76\u5c06\u5176\u653e\u5165\u7ec4\u7ec7\u5171\u4eab\u5185\u5b58\u7ed3\u6784\u4f53\u7684\u6570\u636e\u7ed3\u6784\u4e2d&#xff0c;\u90a3\u4e48\u6700\u540e\u521b\u5efa\u5b8c\u6210\u540e&#xff0c;\u4f1a\u8fd4\u56de\u8be5\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u800c\u5982\u679c\u8bf4\u53d1\u73b0\u6709\u5339\u914d\u7684key\u503c\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u5c31\u76f4\u63a5\u8fd4\u56de\u8be5\u5171\u4eab\u5185\u5b58\u7684shmid IPC_EXCL: \u800cIPC_EXCL\u5219\u662f\u548cIPC_CREAT\u4e00\u8d77\u4f7f\u7528&#xff0c;\u90a3\u4e48\u4f20\u9012IPC_CREAT| IPC_EXCL\u8fd9\u4e2a\u5b8f\u7ed9shmget\u63a5\u53e3&#xff0c;\u5176\u5e95\u5c42\u6d89\u53ca\u5230\u5de5\u4f5c,j\u5c31\u662f\u5982\u679c\u5185\u6838\u53d1\u73b0\u4e86\u6709\u5339\u914d\u7684key\u503c\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u4e0d\u4f1a\u8fd4\u56de\u8be5\u5171\u4eab\u5185\u5b58\u7684shmid\u800c\u662f\u8fd4\u56de-1\u5e76\u8bbe\u7f6eerrno&#xff0c;\u6ca1\u6709\u7684\u8bdd\u5c31\u521b\u5efa\u65b0\u7684\u5171\u4eab\u5185\u5b58\u5e76\u8fd4\u56de\u5668shmid&#xff0c;\u6240\u4ee5\u8fd9\u4e2a\u9009\u9879\u5c31\u662f\u4fdd\u8bc1\u4e86\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u662f\u6700\u65b0\u7684\u5171\u4eab\u5185\u5b58&#xff0c;<\/p>\n<p>\u800c\u8fd9\u91cc\u7684\u5b8f\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u7279\u5b9a\u503c\u768432\u4f4d\u7684\u4e8c\u8fdb\u5236\u5e8f\u5217&#xff0c;\u90a3\u4e48\u4ed6\u4eec\u7684\u6bcf\u4e00\u4e2a\u6bd4\u7279\u4f4d\u4ee3\u8868\u7740\u7279\u5b9a\u542b\u4e49\u7684\u6807\u8bb0\u4f4d&#xff0c;\u800c\u8be5\u6807\u8bb0\u4f4d\u5219\u662f\u5206\u5e03\u5728\u4e8c\u8fdb\u5236\u5e8f\u5217\u7684\u9ad824\u4f4d&#xff0c;\u800c\u4f4e8\u4f4d\u5219\u662f\u8868\u793a\u8be5\u5171\u4eab\u5185\u5b58\u7684\u6743\u9650&#xff0c;\u6240\u4ee5\u5728\u4e0a\u6587\u6240\u4e3e\u7684\u4f8b\u5b50\u4e2d&#xff0c;\u5bf9\u4e8eA\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u5b83\u662f\u521b\u5efa\u5171\u4eab\u5185\u5b58\u7684\u4e00\u65b9&#xff0c;\u90a3\u4e48\u5b83\u4f20\u9012\u7684\u5b8f\u5c31\u5e94\u8be5\u662fIPC_CREAT|IPC_EXCL|0666&#xff0c;\u800c\u5bf9\u4e8eB\u8fdb\u7a0b\u6765\u8bf4\u4ed6\u662f\u8bbf\u95ee\u7684\u4e00\u65b9&#xff0c;\u90a3\u4e48\u5b83\u4f20\u9012\u7684\u5c31\u662fIPC_CREAT|0666<\/p>\n<p>\u90a3\u4e48shmget\u4f1a\u6839\u636e\u5176\u5b8f\u8fdb\u884c\u76f8\u5e94\u7684\u884c\u4e3a&#xff0c;\u5e76\u4e14\u8fd8\u4f1a\u6838\u5bf9\u5176\u6743\u9650\u662f\u5426\u4e00\u81f4&#xff0c;\u4e0d\u4e00\u81f4\u5219\u8fd4\u56de-1&#xff0c;\u8c03\u7528\u5931\u8d25<\/p>\n<hr \/>\n<h4>shmat<\/h4>\n<p>\u90a3\u4e48\u6b64\u65f6\u4e0a\u9762\u6240\u8bb2\u7684\u6240\u6709\u5185\u5bb9\u90fd\u662f\u5173\u4e8e\u521b\u5efa\u5171\u4eab\u5185\u5b58\u7684\u4e00\u4e9b\u7406\u8bba\u77e5\u8bc6&#xff0c;\u90a3\u4e48\u6211\u4eec\u73b0\u5728\u5df2\u7ecf\u77e5\u9053\u5982\u4f55\u521b\u5efa\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u4e0b\u4e00\u6b65\u5c31\u662f\u5982\u4f55\u8ba9\u901a\u4fe1\u7684\u8fdb\u7a0b\u53cc\u65b9\u770b\u5230\u8be5\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u4ece\u4e0a\u6587\u7684\u5171\u4eab\u5185\u5b58\u5b9e\u73b0\u901a\u4fe1\u7684\u5927\u81f4\u539f\u7406&#xff0c;\u6211\u4eec\u77e5\u9053\u521b\u5efa\u5b8c\u5171\u4eab\u5185\u5b58\u7684\u4e0b\u4e00\u4e2a\u73af\u8282\u5c31\u662f\u8ba9\u8fdb\u7a0b\u53cc\u65b9\u6301\u6709\u6307\u5411\u8be5\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5c31\u9700\u8981\u8bf7\u6c42\u64cd\u4f5c\u7cfb\u7edf\u6765\u8bbe\u7f6e\u901a\u4fe1\u8fdb\u7a0b\u7684\u53cc\u65b9\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4\u7684\u5171\u4eab\u5185\u5b58\u6bb5\u4ee5\u53ca\u5728\u9875\u8868\u4e2d\u6dfb\u52a0\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u6761\u76ee&#xff0c;\u6240\u4ee5\u6b64\u65f6\u5c31\u9700\u8981\u6211\u4eec\u5728\u4ee3\u7801\u5c42\u9762\u4e0a\u8c03\u7528shmat\u7cfb\u7edf\u8c03\u7528\u63a5\u53e3&#xff0c;\u90a3\u4e48\u8be5\u7cfb\u7edf\u8c03\u7528\u63a5\u53e3\u7684\u80cc\u540e\u6240\u505a\u7684\u5de5\u4f5c\u5c31\u662f\u521a\u624d\u6240\u8bf4\u7684\u5185\u5bb9&#xff0c;\u800cshmat\u6240\u505a\u7684\u5de5\u4f5c\u4e5f\u53eb\u505a\u6302\u8f7d<\/p>\n<ul>\n<li>shmat<\/li>\n<li>\u5934\u6587\u4ef6&#xff1a;&lt;sys\/shm.h&gt; \u548c&lt;sys\/types.h&gt;<\/li>\n<li>\u51fd\u6570\u58f0\u660e&#xff1a;void* shmat(int shmid,void *shmadder,int shmflg);<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u8c03\u7528\u6210\u529f\u8fd4\u56de\u6307\u5411\u5171\u4eab\u5185\u5b58\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740&#xff0c;\u8c03\u7528\u5931\u8d25\u5219\u8fd4\u56de(void*)-1,\u5e76\u8bbe\u7f6eerrno<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u8fd9\u91ccshmat\u63a5\u53e3\u4f1a\u63a5\u6536\u4e4b\u524d\u6211\u4eec\u8c03\u7528shmget\u63a5\u53e3\u83b7\u53d6\u7684\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u7136\u540e\u5185\u6838\u4f1a\u6839\u636e\u8be5shmid\u904d\u5386\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53&#xff0c;\u7136\u540e\u627e\u5230\u5339\u914d\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u63a5\u7740\u5728\u5c06\u5171\u4eab\u5185\u5b58\u6302\u8f7d\u5230\u901a\u4fe1\u7684\u8fdb\u7a0b\u53cc\u65b9&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5c31\u662f\u6211\u4eec\u53ef\u4ee5\u6307\u5b9a\u5185\u6838\u6302\u8f7d\u5230\u5171\u4eab\u5185\u5b58\u6bb5\u7684\u54ea\u4e2a\u5177\u4f53\u533a\u57df&#xff0c;\u4f46\u662f\u8fd9\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6700\u597d\u8bbe\u7f6e\u4e3aNULL,\u90a3\u4e48\u8bbe\u7f6e\u4e3aNULL\u610f\u5473\u7740\u4f1a\u8ba9\u5185\u6838\u6765\u5728\u5171\u4eab\u5185\u5b58\u6bb5\u4e2d\u9009\u62e9\u5e76\u4e14\u5206\u914d\u4e00\u4e2a\u5408\u9002\u7684\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u8be5\u865a\u62df\u5730\u5740\u5c31\u4f1a\u4f5c\u4e3a\u8fd4\u56de\u503c<\/p>\n<p>\u800cshmat\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u5219\u662f\u4f1a\u63a5\u6536\u4e00\u4e2a\u5b8f&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u5b8f\u5c31\u662f\u7528\u6765\u6307\u5b9a\u8be5\u8fdb\u7a0b\u5bf9\u4e8e\u8be5\u5171\u4eab\u5185\u5b58\u7684\u4e00\u4e2a\u8bfb\u5199\u6743\u9650&#xff1a;<\/p>\n<ul>\n<li>SHM_RDONLY (\u53ea\u8bfb\u6a21\u5f0f)&#xff1a;\u4ee5\u53ea\u8bfb\u65b9\u5f0f\u9644\u52a0\u5171\u4eab\u5185\u5b58<\/li>\n<li>SHM_RND (\u5730\u5740\u5bf9\u9f50)&#xff1a;\u5f53\u6307\u5b9a\u4e86\u975eNULL\u7684shmaddr\u65f6&#xff0c;\u81ea\u52a8\u5c06\u5730\u5740\u5411\u4e0b\u5bf9\u9f50\u5230SHMLBA\u8fb9\u754c<\/li>\n<li>SHM_REMAP (Linux\u7279\u6709&#xff0c;\u91cd\u65b0\u6620\u5c04)&#xff1a; \u66ff\u6362\u6307\u5b9a\u5730\u5740\u7684\u73b0\u6709\u6620\u5c04&#xff0c;\u9700\u8981\u4e0e\u5177\u4f53\u7684shmaddr\u914d\u5408\u4f7f\u7528<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8e\u6211\u4eec\u6765\u8bf4&#xff0c;\u90a3\u4e48\u6211\u4eec\u4e0d\u7528\u4f20\u9012\u4efb\u4f55\u5b8f\u5c31\u8fdb\u53bb&#xff0c;\u5c31\u4f20\u9012\u4e00\u4e2aNULL\u6216\u80050&#xff0c;\u90a3\u4e48\u6211\u4eec\u8be5\u8fdb\u7a0b\u5c31\u80fd\u591f\u6b63\u5e38\u7684\u5199\u5165\u4ee5\u53ca\u8bfb\u53d6\u8be5\u5171\u4eab\u5185\u5b58\u7684\u5185\u5bb9&#xff0c;\u90a3\u4e48\u8fd9\u4e09\u4e2a\u5b8f\u7684\u4f7f\u7528\u573a\u666f&#xff0c;\u5728\u76ee\u524d\u73b0\u9636\u6bb5\u7684\u5b66\u4e60\u6765\u8bf4&#xff0c;\u6211\u4eec\u6682\u65f6\u8fd8\u4f7f\u7528\u4e0d\u5230\u3002<\/p>\n<p>\u90a3\u4e48\u8fd9\u5c31\u662fshmat\u63a5\u53e3&#xff0c;\u90a3\u4e48\u8ba4\u8bc6\u4e86shmat\u63a5\u53e3\u4e4b\u540e&#xff0c;\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u6765\u5229\u7528\u5171\u4eab\u5185\u5b58\u6765\u5b9e\u73b0\u6b63\u5e38\u7684\u8fdb\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u4e86&#xff0c;\u90a3\u4e48\u9996\u5148\u7b2c\u4e00\u4e2a\u73af\u8282\u5c31\u662f\u5148\u8ba9\u5404\u81ea\u901a\u4fe1\u7684\u8fdb\u7a0b\u53cc\u65b9\u6301\u6709key&#xff0c;\u7136\u540e\u4e00\u4e2a\u8fdb\u7a0b\u901a\u8fc7key\u6765\u8c03\u7528shmget\u63a5\u53e3\u6765\u521b\u5efa\u5171\u4eab\u5185\u5b58\u5e76\u4e14\u83b7\u5f97\u5176shmid&#xff0c;\u800c\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u4e5f\u662f\u540c\u6837\u901a\u8fc7key\u503c\u6765\u8c03\u7528shmge\u63a5\u53e3\u6765\u83b7\u53d6\u5df2\u7ecf\u521b\u5efa\u597d\u7684\u5171\u4eab\u5185\u5b58\u7684shmid,\u90a3\u4e48\u4e0b\u4e00\u4e2a\u73af\u8282\u5c31\u662f\u6302\u8f7d&#xff0c;\u90a3\u4e48\u6b64\u65f6\u5c31\u9700\u8981\u8bf7\u6c42\u7cfb\u7edf\u8bbe\u7f6e\u901a\u4fe1\u7684\u8fdb\u7a0b\u53cc\u65b9\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4\u7684\u5171\u4eab\u5185\u5b58\u6bb5&#xff0c;\u5e76\u4e14\u6dfb\u52a0\u76f8\u5e94\u7684\u5173\u4e8e\u8be5\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u7684\u6761\u76ee&#xff0c;\u5e76\u4e14\u8fd4\u56de\u7ed9\u8fdb\u7a0b\u53cc\u65b9\u8be5\u5171\u4eab\u5185\u5b58\u7684\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u6b64\u65f6\u8fdb\u7a0b\u53cc\u65b9\u5c31\u53ef\u4ee5\u6301\u6709\u8be5\u865a\u62df\u5730\u5740\u53bb\u8bbf\u95ee\u5171\u4eab\u5185\u5b58\u4e86<\/p>\n<h4>shmdet<\/h4>\n<p>\u90a3\u4e48\u8fdb\u7a0b\u901a\u4fe1\u5b8c\u4e4b\u540e&#xff0c;\u90a3\u6b64\u65f6\u5c31\u8981\u6e05\u7406\u76f8\u5173\u7684\u8d44\u6e90&#xff0c;\u5176\u4e2d\u5c31\u5305\u62ec\u6253\u5f00\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u6211\u4eec\u8981\u6ce8\u610f\u7684\u5c31\u662f\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684shm_kernel\u7ed3\u6784\u4f53\u4e2d\u4f1a\u6709\u4e00\u4e2a\u5c5e\u6027&#xff0c;\u90a3\u4e48\u8be5\u5c5e\u6027\u4fbf\u662f\u5f15\u7528\u8ba1\u6570&#xff0c;\u8bb0\u5f55\u4e86\u6709\u591a\u5c11\u4e2a\u8fdb\u7a0b\u6307\u5411\u5b83\u6216\u8005\u8bf4\u6709\u591a\u5c11\u4e2a\u8fdb\u7a0b\u7684\u9875\u8868\u4e2d\u6709\u5173\u4e8e\u8be5\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u6761\u76ee&#xff0c;\u90a3\u4e48\u6b64\u65f6shmdet\u63a5\u53e3\u7684\u4f5c\u7528\u5c31\u662f\u5220\u9664\u8be5\u8fdb\u7a0b\u5bf9\u5e94\u7684\u9875\u8868\u4e2d\u5171\u4eab\u5185\u5b58\u7684\u6620\u5c04\u6761\u76ee\u6216\u8005\u5c06\u8be5\u9875\u8868\u7684\u6761\u76ee\u8bbe\u7f6e\u4e3a\u65e0\u6548&#xff0c;\u4ece\u800c\u89e3\u9664\u8be5\u8fdb\u7a0b\u4e0e\u5171\u4eab\u5185\u5b58\u4e4b\u95f4\u7684\u7ed1\u5b9a&#xff0c;\u8ba9\u8be5\u8fdb\u7a0b\u65e0\u6cd5\u518d\u8bbf\u95ee\u5230\u5171\u4eab\u5185\u5b58\u7684\u8d44\u6e90&#xff0c;\u5e76\u4e14\u8fd8\u4f1a\u51cf\u5c11\u8be5\u5171\u4eab\u5185\u5b58\u7684\u5f15\u7528\u8ba1\u6570<\/p>\n<ul>\n<li>shmdet<\/li>\n<li>\u5934\u6587\u4ef6&#xff1a;&lt;sys\/shm.h&gt; \u548c&lt;sys\/ipc.h&gt;<\/li>\n<li>\u51fd\u6570\u58f0\u660e&#xff1a;int shmdet(const void *shmadder);<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u8fd4\u56de0,\u5931\u8d25\u8fd4\u56de-1&#xff0c;\u5e76\u8bbe\u7f6eerrno<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u53ef\u80fd\u4f1a\u6709\u7684\u8bfb\u8005\u4f1a\u611f\u5230\u7591\u60d1\u7684\u5c31\u662f&#xff0c;\u8fd9\u91ccshmdet\u63a5\u53e3\u53ea\u63a5\u6536\u4e00\u4e2a\u865a\u62df\u5730\u5740&#xff0c;\u800c\u8be5\u865a\u62df\u5730\u5740\u662f\u5171\u4eab\u5185\u5b58\u7684\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u5185\u6838\u53ef\u4ee5\u901a\u8fc7\u8be5\u865a\u62df\u5730\u5740\u501f\u52a9\u9875\u8868\u6765\u8bbf\u95ee\u5230\u5171\u4eab\u5185\u5b58&#xff0c;\u800c\u5f15\u7528\u8ba1\u6570\u8fd9\u4e2a\u5c5e\u6027\u662f\u5b58\u50a8\u5728\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53\u4e2d&#xff0c;\u90a3\u4e48\u610f\u5473\u7740\u8fd9\u91ccshmdet\u80fd\u591f\u901a\u8fc7\u865a\u62df\u5730\u5740\u6765\u8bbf\u95ee\u5230\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7269\u7406\u7ed3\u6784\u4f53&#xff0c;\u800c\u5171\u4eab\u5185\u5b58\u4e2d\u5b58\u50a8\u7684\u5185\u5bb9\u53bb\u554a\u4e0d\u662f\u901a\u4fe1\u7684\u6d88\u606f&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5185\u6838\u662f\u5982\u4f55\u901a\u8fc7\u8be5\u865a\u62df\u5730\u5740\u8bbf\u95ee\u5230\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53\u7684\u5462&#xff1f;<\/p>\n<p>\u90a3\u4e48\u6211\u4eec\u77e5\u9053\u8fdb\u7a0b\u5bf9\u5e94\u7684task_struct\u7ed3\u6784\u4f53\u4e2d\u4f1a\u6709\u4e00\u4e2a\u5b57\u6bb5mm_struct\u7ed3\u6784\u4f53\u5176\u4e2d\u4f1a\u7ef4\u62a4\u4e00\u4e2avma&#xff08;\u865a\u62df\u5185\u5b58\u533a\u57df&#xff09;\u7684\u6570\u636e\u7ed3\u6784&#xff0c;\u90a3\u4e48\u8be5\u6570\u636e\u7ed3\u6784\u4e00\u822c\u662f\u91c7\u53d6\u94fe\u8868\u6765\u5b9e\u73b0&#xff0c;\u5176\u4e2d\u8be5\u94fe\u8868\u7684\u6bcf\u4e00\u4e2a\u8282\u70b9\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53&#xff0c;\u7528\u6765\u63cf\u8ff0\u4ee5\u53ca\u8bb0\u5f55\u8be5\u865a\u62df\u5185\u5b58\u533a\u57df\u7684\u76f8\u5173\u5c5e\u6027&#xff0c;\u5176\u4e2d\u5c31\u5305\u62ec\u8be5\u865a\u62df\u5185\u5b58\u533a\u57df\u7684\u865a\u62df\u5730\u5740\u7684\u8d77\u59cb\u4f4d\u7f6e\u4ee5\u53ca\u865a\u62df\u5730\u5740\u7684\u7ed3\u675f\u4f4d\u7f6e&#xff0c;\u4ee5\u53ca\u76f8\u5173\u7684\u8bfb\u5199\u6743\u9650\u4ee5\u53ca\u5176\u6587\u4ef6\u7684\u5927\u5c0f\u548c\u6587\u4ef6\u7684\u7c7b\u578b<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>mmap<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ VMA \u94fe\u8868\u7684\u5934\u8282\u70b9&#xff08;\u5355\u94fe\u8868&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">rb_root<\/span> mm_rb<span class=\"token punctuation\">;<\/span>               <span class=\"token comment\">\/\/ VMA \u7ea2\u9ed1\u6811\u7684\u6839\u8282\u70b9&#xff08;\u7528\u4e8e\u5feb\u901f\u67e5\u627e&#xff09;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;\u5176\u4ed6\u5b57\u6bb5&#xff08;\u5982\u9875\u8868\u3001\u5185\u5b58\u8ba1\u6570\u5668\u7b49&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u5b58\u8303\u56f4<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> vm_start<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> vm_end<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6743\u9650\u4e0e\u6807\u5fd7<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> vm_flags<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6587\u4ef6\u4e0e\u504f\u79fb<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>vm_file<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> vm_pgoff<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u64cd\u4f5c\u51fd\u6570<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_operations_struct<\/span> <span class=\"token operator\">*<\/span>vm_ops<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u94fe\u8868\u4e0e\u6811\u7ed3\u6784<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vm_next<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">rb_node<\/span> vm_rb<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5176\u4ed6\u5143\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>vm_mm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5176\u4e2d\u5728vma\u7684\u89c6\u89d2\u4e0b&#xff0c;\u90a3\u4e48\u5b83\u5c06\u6bcf\u4e00\u4e2a\u865a\u62df\u5185\u5b58\u533a\u57df\u6bd4\u5982\u6808\u6216\u8005\u5806&#xff0c;\u4ee5\u6587\u4ef6\u7684\u5f62\u5f0f\u6765\u770b\u5f85&#xff0c;\u90a3\u4e48\u5176\u4e2d\u8fd9\u91cc\u7684vm_file\u5b57\u6bb5\u4f1a\u6307\u5411\u8be5\u865a\u62df\u5185\u5b58\u533a\u57df\u521b\u5efa\u7684\u4e00\u4e2afile\u7ed3\u6784\u4f53&#xff0c;\u5176\u4e2d\u5c31\u4f1a\u5305\u542b\u8be5\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684struct shm_kernal\u7ed3\u6784\u4f53&#xff0c;\u6240\u4ee5\u8fd9\u91ccshmdet\u63a5\u53e3\u4f1a\u83b7\u53d6\u5230\u865a\u62df\u5730\u5740&#xff0c;\u7136\u540e\u4f1a\u67e5\u8be2mm_struct\u7ed3\u6784\u4f53\u4e2d\u8bb0\u5f55\u7684vma\u94fe\u8868\u6839\u636e\u8be5\u865a\u62df\u5730\u5740\u786e\u5b9a\u843d\u5728\u54ea\u4e00\u4e2avma\u7ed3\u6784\u4f53\u4e2d&#xff0c;\u90a3\u4e48\u8be5vma\u7ed3\u6784\u4f53\u5c31\u662f\u5171\u4eab\u5185\u5b58\u6bb5\u533a\u57df\u6240\u5bf9\u5e94\u7684vma\u7ed3\u6784\u4f53&#xff0c;\u7136\u540e\u901a\u8fc7vm_file\u6765\u95f4\u63a5\u83b7\u53d6\u5230\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u6700\u540e\u518d\u62ff\u7740shmid\u4ece\u4fdd\u5b58\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u6570\u636e\u7ed3\u6784\u4e2d\u627e\u5230\u5bf9\u5e94\u5339\u914d\u7684\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53&#xff0c;\u7136\u540e\u8ba9\u5176\u5f15\u7528\u8ba1\u6570\u51cf\u4e00<\/p>\n<h4>shmctl<\/h4>\n<p>\u800cshmdet\u53ea\u662f\u89e3\u9664\u4e86\u8fdb\u7a0b\u4e0e\u5171\u4eab\u5185\u5b58\u4e4b\u95f4\u7684\u6302\u8f7d&#xff0c;\u90a3\u4e48shmdet\u7684\u4f5c\u7528\u5c31\u597d\u6bd4\u6307\u5411\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\u7684\u9996\u5143\u7d20\u7684\u6307\u9488&#xff0c;\u90a3\u4e48\u6211\u4eec\u53ea\u662f\u5c06\u8be5\u6307\u9488\u7f6e\u7a7a&#xff0c;\u8ba9\u6211\u4eec\u65e0\u6cd5\u5728\u4e4b\u540e\u7684\u4ee3\u7801\u4e2d\u901a\u8fc7\u8be5\u6307\u9488\u6765\u8bbf\u95ee\u8be5\u52a8\u6001\u6570\u7ec4&#xff0c;\u4f46\u662f\u8be5\u52a8\u6001\u6570\u7ec4\u6240\u5bf9\u5e94\u7684\u7a7a\u95f4\u5e76\u6ca1\u6709\u91ca\u653e&#xff0c;\u800c\u5bf9\u4e8e\u5171\u4eab\u5185\u5b58\u6765\u8bf4&#xff0c;\u90a3\u4e48\u5185\u6838\u8981\u771f\u6b63\u91ca\u653e\u5171\u4eab\u5185\u5b58\u7684\u8d44\u6e90\u5f97\u6ee1\u8db3\u4e24\u4e2a\u524d\u63d0\u6761\u4ef6&#xff0c;\u90a3\u4e48\u5c31\u662f\u8be5\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u5f15\u7528\u8ba1\u6570\u4e3a0\u5e76\u4e14\u8be5\u5171\u4eab\u5185\u5b58\u8fd8\u5f97\u88ab\u6807\u8bb0\u4e3a\u5df2\u5220\u9664&#xff0c;\u56e0\u4e3a\u5185\u6838\u6ca1\u6709\u89c4\u5b9a\u8be5\u5171\u4eab\u5185\u5b58\u53ea\u80fd\u7ed9\u521b\u5efa\u5b83\u7684\u8fdb\u7a0b\u53cc\u65b9\u901a\u4fe1\u7528&#xff0c;\u90a3\u4e48\u4e00\u65e6\u8be5\u8fdb\u7a0b\u53cc\u65b9\u7ed3\u675f\u901a\u4fe1\u4e86&#xff0c;\u90a3\u4e48\u53ef\u4ee5\u8ba9\u8be5\u8fdb\u7a0b\u53cc\u65b9\u89e3\u9664\u4e0e\u8be5\u5171\u4eab\u5185\u5b58\u7684\u6302\u8f7d&#xff0c;\u7136\u540e\u8ba9\u5176\u4ed6\u8fdb\u7a0b\u4e0e\u8be5\u5171\u4eab\u5185\u5b58\u6302\u8f7d&#xff0c;\u4ece\u800c\u901a\u8fc7\u518d\u6b21\u5229\u7528\u8be5\u5171\u4eab\u5185\u5b58\u6765\u8fdb\u884c\u901a\u4fe1&#xff0c;\u6240\u4ee5\u8fd9\u91cc\u5c31\u662f\u4e3a\u4ec0\u4e48\u8981\u8bbe\u8ba1\u4e00\u4e2a\u5220\u9664\u6807\u5fd7<\/p>\n<p>\u6240\u4ee5\u8bf4\u8fd9\u91cc\u7684shmctl\u63a5\u53e3\u7684\u4f5c\u7528\u5c31\u662f\u7528\u6765\u63a7\u5236\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u8be5\u63a5\u53e3\u5c06\u5171\u4eab\u5185\u5b58\u6807\u8bb0\u4e3a\u53ef\u5220\u9664&#xff0c;\u90a3\u4e48\u4e00\u65e6\u8be5\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u5f15\u7528\u8ba1\u6570\u4e3a0&#xff0c;\u90a3\u4e48\u6b64\u65f6\u5185\u6838\u5c31\u4f1a\u91ca\u653e\u8be5\u5171\u4eab\u5185\u5b58\u7684\u8d44\u6e90<\/p>\n<ul>\n<li>shmctl<\/li>\n<li>\u5934\u6587\u4ef6&#xff1a;&lt;sys\/shm.h&gt; \u548c&lt;sys\/ipc.h&gt;<\/li>\n<li>\u51fd\u6570\u58f0\u660e&#xff1a;int shmctl(int shmid,int cmd,struct shmid_ds* buffer);<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u8c03\u7528\u6210\u529f\u8fd4\u56de0&#xff0c;\u8c03\u7528\u5931\u8d25\u5219\u8fd4\u56de-1,\u5e76\u8bbe\u7f6eerrno<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8eshmctl\u6765\u8bf4&#xff0c;\u5176\u7b2c\u4e00\u4e2a\u53c2\u6570\u662fshmid,\u90a3\u4e48\u5230\u65f6\u5185\u6838\u4f1a\u6301\u6709\u8be5\u53c2\u6570\u53bb\u5bfb\u627e\u5bf9\u5e94\u7684\u5171\u4eab\u5185\u5b58\u7684\u7ed3\u6784\u4f53&#xff0c;\u800cshmctl\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5219\u662f\u63a7\u5236shmctl\u63a5\u53e3\u7684\u884c\u4e3a&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u8fd8\u662f\u901a\u8fc7\u5b8f\u4ee5\u53ca\u4f4d\u8fd0\u7b97\u7684\u65b9\u5f0f\u6765\u6307\u5b9ashmctl\u63a5\u53e3\u7684\u884c\u4e3a&#xff1a;<\/p>\n<ul>\n<li>IPC_STAT&#xff1a;\u83b7\u53d6\u5171\u4eab\u5185\u5b58\u6bb5\u7684\u72b6\u6001<\/li>\n<li>IPC_RMID&#xff1a;\u5220\u9664\u5171\u4eab\u5185\u5b58\u6bb5<\/li>\n<li>IPC_SET&#xff1a;\u8bbe\u7f6e\u5171\u4eab\u5185\u5b58\u6bb5\u7684\u72b6\u6001<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u8fd9\u91ccIPC_SET\u8fd9\u4e2a\u5b8f&#xff0c;\u6211\u4eec\u76ee\u524d\u8fd8\u5e94\u7528\u4e0d\u5230&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5982\u679c\u8981\u5c06\u5171\u4eab\u5185\u5b58\u6807\u8bb0\u4e3a\u5220\u9664&#xff0c;\u90a3\u4e48\u5c31\u4f20\u5165IPC_RMID\u5373\u53ef<\/p>\n<p>\u800c\u5982\u679c\u6211\u4eec\u8981\u83b7\u53d6\u5171\u4eab\u5185\u5b58\u7684\u72b6\u6001&#xff0c;\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u4f20\u5165IPC_STAT\u8fd9\u4e2a\u5b8f&#xff0c;\u6b64\u65f6shmctl\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u5c31\u6709\u610f\u4e49&#xff0c;\u90a3\u4e48\u5b83\u4f1a\u63a5\u6536\u4e00\u4e2a\u6307\u5411struct shm_ds\u7684\u7ed3\u6784\u4f53&#xff0c;\u90a3\u4e48\u8be5\u7ed3\u6784\u4f53\u7684\u5b9a\u4e49\u662f\u5b58\u653e\u5728sys\/shm.h\u5934\u6587\u4ef6\u4e2d&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5185\u6838\u4f1a\u901a\u8fc7shmid\u7136\u540e\u8bbf\u95ee\u5230\u8be5\u5171\u4eab\u5185\u5b58\u5bf9\u5e94\u7684\u7ed3\u6784\u4f53&#xff0c;\u6839\u636e\u5176\u7ed3\u6784\u4f53\u6765\u521d\u59cb\u5316struct shm_ds<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">shmid_ds<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ipc_perm<\/span> shm_perm<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5171\u4eab\u5185\u5b58\u6bb5\u7684\u6743\u9650\u4fe1\u606f<\/span><br \/>\n    <span class=\"token class-name\">size_t<\/span>          shm_segsz<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5171\u4eab\u5185\u5b58\u6bb5\u7684\u5927\u5c0f&#xff08;\u5b57\u8282&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">time_t<\/span>          shm_atime<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6700\u540e\u4e00\u6b21\u9644\u52a0\u7684\u65f6\u95f4<\/span><br \/>\n    <span class=\"token class-name\">time_t<\/span>          shm_dtime<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6700\u540e\u4e00\u6b21\u65ad\u5f00\u7684\u65f6\u95f4<\/span><br \/>\n    <span class=\"token class-name\">time_t<\/span>          shm_ctime<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6700\u540e\u4e00\u6b21\u4fee\u6539\u7684\u65f6\u95f4<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span>           shm_cpid<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u521b\u5efa\u5171\u4eab\u5185\u5b58\u6bb5\u7684\u8fdb\u7a0b ID<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span>           shm_lpid<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u6700\u540e\u4e00\u6b21\u64cd\u4f5c\u7684\u8fdb\u7a0b ID<\/span><br \/>\n    <span class=\"token class-name\">shmatt_t<\/span>        shm_nattch<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5f53\u524d\u9644\u52a0\u5230\u5171\u4eab\u5185\u5b58\u6bb5\u7684\u8fdb\u7a0b\u6570&#xff08;\u5f15\u7528\u8ba1\u6570&#xff09;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; \u5176\u4ed6\u5b57\u6bb5&#xff08;\u53ef\u80fd\u56e0\u7cfb\u7edf\u800c\u5f02&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/* \u5b9a\u4e49\u5728 sys\/ipc.h \u4e2d *\/<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">ipc_perm<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">key_t<\/span>          __key<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/* \u7528\u4e8e\u6807\u8bc6 IPC \u5bf9\u8c61\u7684\u952e\u503c *\/<\/span><br \/>\n    <span class=\"token class-name\">uid_t<\/span>          uid<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/* \u5171\u4eab\u5185\u5b58\u6bb5\u7684\u6240\u6709\u8005\u7528\u6237 ID *\/<\/span><br \/>\n    <span class=\"token class-name\">gid_t<\/span>          gid<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/* \u5171\u4eab\u5185\u5b58\u6bb5\u7684\u6240\u6709\u8005\u7ec4 ID *\/<\/span><br \/>\n    <span class=\"token class-name\">uid_t<\/span>          cuid<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/* \u521b\u5efa\u8be5 IPC \u5bf9\u8c61\u7684\u7528\u6237 ID *\/<\/span><br \/>\n    <span class=\"token class-name\">gid_t<\/span>          cgid<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/* \u521b\u5efa\u8be5 IPC \u5bf9\u8c61\u7684\u7ec4 ID *\/<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> mode<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/* \u6743\u9650\u4f4d&#xff08;\u7c7b\u4f3c\u4e8e\u6587\u4ef6\u6743\u9650&#xff09; *\/<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> __seq<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/* \u5e8f\u5217\u53f7&#xff0c;\u7528\u4e8e\u9632\u6b62\u952e\u503c\u51b2\u7a81 *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u901a\u8fc7\u8bbf\u95ee\u8be5\u7ed3\u6784\u4f53\u4e2d\u7684\u76f8\u5173\u6210\u5458\u53d8\u91cf\u6765\u83b7\u53d6\u5171\u4eab\u5185\u5b58\u7684\u76f8\u5173\u5c5e\u6027\u4fe1\u606f<\/p>\n<hr \/>\n<h2>\u5229\u7528\u5171\u4eab\u5185\u5b58\u6765\u5b9e\u73b0\u8fdb\u7a0b\u95f4\u7684\u901a\u4fe1<\/h2>\n<p>\u90a3\u4e48\u5728\u4e0a\u6587\u6211\u4ecb\u7ecd\u4e86\u5171\u4eab\u5185\u5b58\u76f8\u5173\u7684\u7406\u8bba\u57fa\u7840\u4ee5\u53ca\u5173\u4e8e\u5171\u4eab\u5185\u5b58\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\u63a5\u53e3&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c31\u4f1a\u7ed3\u5408\u524d\u9762\u6240\u5b66\u7684\u77e5\u8bc6\u4ee5\u53ca\u7cfb\u7edf\u8c03\u7528\u63a5\u53e3\u6765\u5b9e\u73b0\u4e24\u4e2a\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u4e00\u4e2a\u5c0f\u9879\u76ee&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u4ecb\u7ecd\u8fd9\u4e2a\u9879\u76ee\u4e4b\u524d&#xff0c;\u6211\u4eec\u8fd8\u662f\u6765\u68b3\u7406\u4e00\u4e0b\u5927\u81f4\u7684\u6846\u67b6&#xff0c;\u7136\u540e\u518d\u5177\u4f53\u843d\u5b9e\u5177\u4f53\u5404\u4e2a\u6a21\u5757\u7684\u4ee3\u7801\u600e\u4e48\u53bb\u5199<\/p>\n<h3>\u5927\u4f53\u6846\u67b6<\/h3>\n<p>\u90a3\u4e48\u8fd9\u91cc\u65e2\u7136\u8981\u5b9e\u73b0\u8fdb\u7a0b\u95f4\u7684\u901a\u4fe1&#xff0c;\u90a3\u4e48\u6211\u9996\u5148\u5c31\u5f97\u51c6\u5907\u4e24\u4e2a\u964c\u751f\u8fdb\u7a0b&#xff0c;\u5206\u522b\u662fprocessA\u4ee5\u53caprocessB&#xff0c;\u90a3\u4e48processA\u8fdb\u7a0b\u7684\u4efb\u52a1\u5c31\u662f\u5c31\u662f\u8d1f\u8d23\u521b\u5efa\u5171\u4eab\u5185\u5b58&#xff0c;\u7136\u540e\u5c06\u521b\u5efa\u597d\u7684\u5171\u4eab\u5185\u5b58\u6302\u8f7d&#xff0c;\u7136\u540eprocessA\u4f5c\u4e3a\u5171\u4eab\u5185\u5b58\u7684\u5199\u5165\u65b9&#xff0c;\u5411\u5171\u4eab\u5185\u5b58\u5199\u5165\u6570\u636e&#xff0c;\u6700\u540e\u89e3\u9664\u6302\u8f7d&#xff0c;\u7136\u540e\u6e05\u7406\u5171\u4eab\u5185\u5b58\u8d44\u6e90&#xff0c;\u800cprocessB\u7684\u4efb\u52a1\u5219\u662f\u8bbf\u95eeprocessA\u521b\u5efa\u597d\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u7136\u5c06\u8be5\u5171\u4eab\u5185\u5b58\u6302\u8f7d\u5230\u5176\u865a\u62df\u5730\u5740\u7a7a\u95f4&#xff0c;\u7136\u540eprocessB\u4f5c\u4e3a\u5171\u4eab\u5185\u5b58\u7684\u8bfb\u53d6\u6cd5&#xff0c;\u8bfb\u53d6\u6570\u636e&#xff0c;\u6700\u540e\u89e3\u9664\u6302\u8f7d<\/p>\n<h4>comm.hpp<\/h4>\n<p>\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u77e5\u9053\u5230\u65f6\u5019A\u548cB\u8fdb\u7a0b\u4f1a\u63a5\u6536\u5230\u4e00\u4e2a\u5171\u540c\u7684key&#xff0c;\u7136\u540e\u4e00\u4e2a\u8fdb\u7a0b\u7528\u8fd9\u4e2akey\u6765\u521b\u5efa\u5171\u4eab\u5185\u5b58&#xff0c;\u800c\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u5219\u662f\u7528\u8be5key\u6765\u83b7\u53d6\u8be5\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u6240\u4ee5\u5230\u65f6\u5019\u8fd9\u4e24\u4e2a\u8fdb\u7a0b\u5bf9\u5e94\u7684\u6e90\u6587\u4ef6\u4f1a\u5404\u81ea\u5f15\u7528\u8be5comm.hpp\u5934\u6587\u4ef6&#xff0c;\u90a3\u4e48comm.hpp\u4e2d\u5c31\u4f1a\u5b9a\u4e49\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u7684key&#xff0c;\u7136\u540e\u5176\u4e2d\u4f1a\u5b9a\u4e49\u4e00\u4e2aCreatkey\u51fd\u6570&#xff0c;\u90a3\u4e48\u8be5\u51fd\u6570\u5185\u90e8\u5c31\u4f1a\u8c03\u7528ftok\u63a5\u53e3\u6765\u751f\u6210\u4e00\u4e2akey\u503c\u5e76\u4e14\u8fd4\u56de&#xff0c;\u800ccomm.hpp\u4e2d\u8fd8\u4f1a\u5b9a\u4e49CreaShm\u51fd\u6570\u548cGetshm\u51fd\u6570&#xff0c;\u90a3\u4e48\u4ece\u8fd9\u4e24\u4e2a\u51fd\u6570\u540d\u6211\u4eec\u5c31\u77e5\u9053\u5b83\u4eec\u5404\u81ea\u7684\u4f5c\u7528&#xff0c;\u90a3\u4e48CreatShm\u51fd\u6570\u5c31\u662f\u63d0\u4f9b\u7ed9A\u8fdb\u7a0b\u4f7f\u7528\u7684&#xff0c;\u5b83\u7684\u4f5c\u7528\u662f\u521b\u5efa\u5171\u4eab\u5185\u5b58&#xff0c;\u5e76\u4e14\u8fd4\u56de\u5176shmid&#xff0c;\u800cGetShm\u5219\u662f\u63d0\u4f9b\u7ed9process B\u4f7f\u7528&#xff0c;\u90a3\u4e48\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u83b7\u53d6process A\u6253\u5f00\u7684\u5171\u4eab\u5185\u5b58\u5e76\u4e14\u8fd4\u56de\u5176shmid,\u800c\u8fd9\u91cc\u53ea\u662f\u68b3\u7406\u5927\u81f4\u6846\u67b6&#xff0c;\u90a3\u4e48\u5177\u4f53\u7684\u5b9e\u73b0\u4f1a\u5728\u540e\u6587\u7ed9\u51fa<\/p>\n<h4>processA.cpp<\/h4>\n<h5>1.\u521b\u5efa\u5171\u4eab\u5185\u5b58<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8eprocess A\u6765\u8bf4&#xff0c;\u90a3\u4e48\u5b83\u7684\u7b2c\u4e00\u4e2a\u73af\u8282\u5c31\u662f\u521b\u5efa\u5171\u4eab\u5185\u5b58&#xff0c;\u4e5f\u5c31\u662f\u8c03\u7528CreatShm\u51fd\u6570\u6765\u83b7\u53d6shmid<\/p>\n<h5>2.\u5c06\u5171\u4eab\u5185\u5b58\u6302\u8f7d\u5230\u865a\u62df\u5730\u5740\u7a7a\u95f4<\/h5>\n<p>\u90a3\u4e48\u63a5\u4e0b\u6765\u83b7\u53d6\u5230\u5171\u4eab\u5185\u5b58\u7684shmid\u4e4b\u540e&#xff0c;\u90a3\u4e48\u4e0b\u4e00\u6b65\u4fbf\u662f\u8c03\u7528shmat\u63a5\u53e3\u6765\u5c06\u8be5\u5171\u4eab\u5185\u5b58\u7ed9\u6302\u8f7d\u5230processA\u8fdb\u7a0b\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4&#xff0c;\u7136\u540e\u83b7\u53d6\u5176\u5171\u4eab\u5185\u5b58\u7684\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740<\/p>\n<h5>3.\u5411\u5171\u4eab\u5185\u5b58\u4e2d\u5199\u5165\u6570\u636e<\/h5>\n<p>\u90a3\u4e48\u8fd9\u4e2a\u73af\u8282\u5c31\u662f\u6839\u636e\u4e4b\u524d\u83b7\u53d6\u5230\u7684\u5171\u4eab\u5185\u5b58\u7684\u865a\u62df\u5730\u5740&#xff0c;\u7136\u540e\u901a\u8fc7\u8be5\u865a\u62df\u5730\u5740\u5411\u5171\u4eab\u5185\u5b58\u4e2d\u5199\u5165\u6570\u636e&#xff0c;\u5176\u4e2d\u5199\u5165\u6570\u636e\u4f1a\u56de\u5c01\u88c5\u5230\u4e00\u4e2a\u6b7b\u5faa\u73af\u7684\u903b\u8f91\u5f53\u4e2d<\/p>\n<h5>4.\u89e3\u9664\u6302\u8f7d<\/h5>\n<p>\u90a3\u4e48\u8fd9\u4e2a\u73af\u8282\u5c31\u662f\u89e3\u9664\u5171\u4eab\u5185\u5b58\u4e0eprocess A\u7684\u5173\u8054&#xff0c;\u5176\u4e2d\u6d89\u53ca\u8c03\u7528shmdet<\/p>\n<h5>5.\u6e05\u7406\u5171\u4eab\u5185\u5b58\u8d44\u6e90<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u6e05\u7406\u5171\u4eab\u5185\u5b58\u8d44\u6e90\u4f1a\u8c03\u7528shmctl\u63a5\u53e3&#xff0c;\u56e0\u4e3ashmdet\u53ea\u662f\u51cf\u5c11\u5f15\u7528\u8ba1\u6570\u4ee5\u53ca\u5220\u9664\u8be5\u8fdb\u7a0b\u5173\u4e8e\u8be5\u5171\u4eab\u5185\u5b58\u7684\u6620\u5c04\u6761\u76ee<\/p>\n<h4>processB.cpp<\/h4>\n<h5>1.\u83b7\u53d6process A\u8fdb\u7a0b\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5c31\u4f1a\u901a\u8fc7\u8c03\u7528GetShm\u6765\u83b7\u53d6process A\u8fdb\u7a0b\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684shmid<\/p>\n<h5>2.\u5c06\u5171\u4eab\u5185\u5b58\u6302\u8f7d<\/h5>\n<p>\u90a3\u4e48\u8fd9\u4e2a\u73af\u8282\u548c\u4e0a\u6587\u7684process A\u6240\u505a\u7684\u5185\u5bb9\u662f\u4e00\u6837\u7684&#xff0c;\u5c31\u662f\u8c03\u7528shmat\u63a5\u53e3&#xff0c;\u7136\u540e\u83b7\u53d6\u8be5\u5171\u4eab\u5185\u5b58\u7684\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740<\/p>\n<h5>3.\u8bfb\u53d6process A\u5411\u5171\u4eab\u5185\u5b58\u5199\u5165\u7684\u6570\u636e<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u4f1a\u540c\u6837\u4f1a\u6839\u636e\u4e0a\u4e00\u4e2a\u73af\u8282\u83b7\u53d6\u5230\u7684\u865a\u62df\u5730\u5740&#xff0c;\u800c\u901a\u8fc7\u8be5\u865a\u62df\u5730\u5740\u8bfb\u53d6\u5171\u4eab\u5185\u5b58\u7684\u5185\u5bb9<\/p>\n<h5>4.\u89e3\u9664\u6302\u8f7d<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8eprocess A\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u90a3\u4e48\u7531\u4e8eprocess A\u8fdb\u7a0b\u6765\u5b8c\u6210\u7684\u5171\u4eab\u5185\u5b58\u7684\u5220\u9664&#xff0c;\u6240\u4ee5\u8fd9\u91cc\u5bf9\u4e8eB\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5b83\u53ea\u9700\u89e3\u9664\u4e0e\u5171\u4eab\u5185\u5b58\u7684\u6302\u8f7d\u5373\u53ef<\/p>\n<h2>\u5404\u4e2a\u6a21\u5757\u7684\u5177\u4f53\u5b9e\u73b0<\/h2>\n<h4>comm.hpp<\/h4>\n<p>\u90a3\u4e48\u8fd9\u91cc\u7684comm.hpp\u7684\u5185\u5bb9\u5c31\u5305\u62ecprocess A\u8fdb\u7a0b\u4ee5\u53caprocess B\u8fdb\u7a0b\u4f1a\u6301\u6709\u7684key&#xff0c;\u4ee5\u53caCreatkey\u51fd\u6570&#xff0c;\u8be5\u51fd\u6570\u5185\u90e8\u4f1a\u8c03\u7528ftok\u51fd\u6570\u6765\u83b7\u53d6\u5230\u8981\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684key\u503c&#xff0c;\u800cftok\u51fd\u6570\u4f1a\u63a5\u6536\u4e00\u4e2a\u5df2\u5b58\u5728\u7684\u8def\u5f84\u4ee5\u53ca\u6587\u4ef6\u540d&#xff0c;\u548cproject_id&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u5f97\u4fdd\u8bc1\u4f20\u9012\u7ed9ftok\u51fd\u6570\u7684\u8def\u5f84\u540d\u4ee5\u53ca\u6587\u4ef6\u540d\u4e00\u81f4&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c06\u6587\u4ef6\u7684\u8def\u5f84\u4ee5\u53ca\u6587\u4ef6\u540d\u5b9a\u4e49\u4e3a\u5168\u5c40\u7684string\u7c7b\u578b\u7684\u53d8\u91cf\u540c\u65f6\u5c06project_id\u4e5f\u5b9a\u4e49\u4e3a\u4e86\u5168\u5c40\u53d8\u91cf&#xff0c;\u800cCreatShm\u51fd\u6570\u5219\u662f\u521b\u5efa\u5171\u4eab\u5185\u5b58&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5185\u90e8\u5b9e\u73b0\u5c31\u4f1a\u6d89\u53ca\u5230\u8c03\u7528shmget\u63a5\u53e3&#xff0c;\u90a3\u4e48GetShm\u51fd\u6570\u5219\u662f\u83b7\u53d6\u5230process A\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5185\u90e8\u4e5f\u8981\u8c03\u7528shmget&#xff0c;\u53ea\u4e0d\u8fc7\u4f20\u9012\u7ed9shmget\u63a5\u53e3\u7684\u5b8f\u4e0d\u4e00\u6837<\/p>\n<p>\u800c\u8fd9\u91cc\u6211\u8fdb\u884c\u4e00\u4e2a\u5de7\u5999\u7684\u5904\u7406&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u76f4\u63a5\u51fd\u6570\u7684\u590d\u7528&#xff0c;\u90a3\u4e48\u76f4\u63a5\u5728GetShm\u51fd\u6570\u5185\u90e8\u76f4\u63a5\u590d\u7528\u5b9a\u4e49\u597d\u7684CreatShm\u51fd\u6570&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u5f97\u5229\u7528\u7f3a\u7701\u53c2\u6570&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u7684\u9ed8\u8ba4\u7f3a\u7701\u53c2\u6570\u5c31\u662fIPC_CREAT|IPC_EXCL|066,\u90a3\u4e48\u8fd9\u91cc\u8c03\u7528GetShm\u51fd\u6570\u4e2d\u5c31\u4f1a\u663e\u793a\u4f20\u9012\u4e00\u4e2aIPC_CREAT\u7684\u5b8f&#xff0c;\u90a3\u4e48\u6b64\u65f6GetShm\u51fd\u6570\u5c31\u4f1a\u8fd4\u56de\u4e00\u4e2a\u4e0e\u76f8\u540ckey\u503c\u7684\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u4e5f\u5c31\u662fprocess A\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684shmid<\/p>\n<p><span class=\"token keyword\">const<\/span> std<span class=\"token operator\">::<\/span>string pathname<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\/home\/WangZhe&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> key<span class=\"token punctuation\">;<\/span><br \/>\nlog a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">CreatKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n       key<span class=\"token operator\">&#061;<\/span><span class=\"token function\">ftok<\/span><span class=\"token punctuation\">(<\/span>pathname<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>ProjectId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;ftoke\u8c03\u7528\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token class-name\">size_t<\/span> <span class=\"token function\">CreatShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> flag<span class=\"token operator\">&#061;<\/span>IPC_CREAT<span class=\"token operator\">|<\/span>IPC_EXCL<span class=\"token operator\">|<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n   <span class=\"token function\">CreatKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmget<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span>SHM_SIZE<span class=\"token punctuation\">,<\/span>flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;shemget fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">return<\/span> shmid<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token class-name\">size_t<\/span> <span class=\"token function\">GetShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">CreatShm<\/span><span class=\"token punctuation\">(<\/span>IPC_CREAT<span class=\"token operator\">|<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token keyword\">return<\/span> shmid<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5728\u51fd\u6570\u5185\u90e8\u8fd8\u8fdb\u884c\u4e86\u76f8\u5e94\u7684\u65e5\u5fd7\u6253\u5370\u903b\u8f91&#xff0c;\u90a3\u4e48\u5982\u679c\u5bf9\u65e5\u5fd7\u4e0d\u719f\u6089\u7684\u8bfb\u8005&#xff0c;\u90a3\u4e48\u5efa\u8bae\u770b\u6211\u4e4b\u524d\u7684\u4e00\u671f\u535a\u5ba2<\/p>\n<h4>processA.cpp<\/h4>\n<h5>1.\u521b\u5efa\u5171\u4eab\u5185\u5b58<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8eprocessA.cpp\u6765\u8bf4&#xff0c;\u7b2c\u4e00\u4e2a\u73af\u8282\u5c31\u662f\u8c03\u7528CreatShm\u51fd\u6570\u6765\u521b\u5efa\u5927\u5c0f\u4e3a4096\u5b57\u8282\u7684\u5171\u4eab\u5185\u5b58\u5e76\u4e14\u83b7\u53d6\u8fd4\u56de\u503c&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u8fd8\u8981\u5bf9\u8fd4\u56de\u503c\u8fdb\u884c\u68c0\u67e5&#xff0c;\u5982\u679cshmget\u63a5\u53e3\u8c03\u7528\u5931\u8d25&#xff0c;\u90a3\u4e48\u8fd4\u56de\u503c\u662f-1&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u9519\u8bef\u662f\u81f4\u547d\u7684&#xff0c;\u90a3\u4e48\u7a0b\u5e8f\u5c31\u65e0\u6cd5\u518d\u7ee7\u7eed\u5f80\u4e0b\u6b63\u5e38\u8fd0\u884c&#xff0c;\u7136\u540e\u8fdb\u884c\u76f8\u5e94\u7684\u65e5\u5fd7\u6253\u5370&#xff0c;\u5e76\u4e14\u9000\u51fa<\/p>\n<p><span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">CreatShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA creat Shm successfully:%d&#034;<\/span><span class=\"token punctuation\">,<\/span>shmid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">mkfifo<\/span><span class=\"token punctuation\">(<\/span>FIFO_FILE<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;creat fifo fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><\/p>\n<h5>2.\u5c06\u5171\u4eab\u5185\u5b58\u6302\u8f7d\u5230\u865a\u62df\u5730\u5740\u7a7a\u95f4<\/h5>\n<p>\u90a3\u4e48\u8be5\u73af\u8282\u4f1a\u5229\u7528\u4e0a\u4e00\u4e2a\u6b65\u9aa4\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684shmid&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u4f1a\u8c03\u7528shmat\u63a5\u53e3\u5c06\u5171\u4eab\u5185\u5b58\u6302\u8f7d\u5230process A\u7684\u5730\u5740\u7a7a\u95f4&#xff0c;\u5e76\u4e14\u6b64\u65f6\u4f1a\u8fd4\u56de\u4e00\u4e2avoid* \u7684\u6307\u9488&#xff0c;\u90a3\u4e48\u8be5\u6307\u9488\u5c31\u662f\u6307\u5411\u5171\u4eab\u5185\u5b58\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u63a5\u4e0b\u6765process A\u8fdb\u7a0b\u5411\u5171\u4eab\u5185\u5b58\u4e2d\u5199\u5165\u6570\u636e\u5c31\u4f1a\u5229\u7528\u8be5\u865a\u62df\u5730\u5740&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528\u8be5\u865a\u62df\u5730\u5740\u53ef\u4ee5\u8054\u7cfb\u6211\u4eec\u901a\u8fc7\u8c03\u7528malloc\u51fd\u6570\u5728\u5806\u4e0a\u7533\u8bf7\u4e86\u4e00\u4e2a\u8fde\u7eed\u7684\u7a7a\u95f4&#xff0c;\u7136\u540e\u5f97\u5230\u8be5\u7a7a\u95f4\u7684\u9996\u5143\u7d20\u7684\u5730\u5740&#xff0c;\u7136\u540e\u6211\u901a\u8fc7\u8be5\u9996\u5143\u7d20\u5730\u5740\u6765\u8bbf\u95ee\u8be5\u7a7a\u95f4\u5e76\u4e14\u5199\u5165\u7684\u8fc7\u7a0b<\/p>\n<p>\u90a3\u4e48\u8fd9\u91cc\u7531\u4e8e\u4e4b\u540e\u6211\u4eec\u8981\u5199\u5165\u7684\u6d88\u606f\u662f\u5b57\u7b26\u4e32&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c31\u53ef\u4ee5\u5c06\u5171\u4eab\u5185\u5b58\u89c6\u4f5c\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c31\u8981\u5c06void*\u7684\u6307\u9488\u5f3a\u5236\u8f6c\u5316\u4e3achar *\u7c7b\u578b<\/p>\n<p>\u800c\u5982\u679cshmat\u8c03\u7528\u5931\u8d25&#xff0c;\u90a3\u4e48\u6b64\u65f6\u4f1a\u8fd4\u56de&#xff08;void*&#xff09;-1\u7684\u6307\u9488&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6ce8\u610f\u7684\u5c31\u662f\u8fd9\u91cc\u7684-1\u662f\u6307\u9488\u7c7b\u578b&#xff0c;\u4e5f\u5c31\u662f\u8bf4\u8fd9\u91cc\u7684-1\u4e0d\u80fd\u6309\u7167\u6240\u8c13\u7684\u6570\u503c\u4e3a-1\u6765\u7406\u89e3&#xff0c;\u800c\u662f\u5f97\u6309\u7167\u4e00\u4e2a\u503c\u4e3a-1\u7684\u4e8c\u8fdb\u5236\u5e8f\u5217&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u6bd4\u8f83\u8fd4\u56de\u503c\u4e0e(void *)-1&#xff0c;\u5224\u65adshmat\u662f\u5426\u8c03\u7528\u6210\u529f<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> Shmadder<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">shmat<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n     a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA attach Fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA attch successfully:0x%x&#034;<\/span><span class=\"token punctuation\">,<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token 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<span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      std<span class=\"token double-colon punctuation\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Please Enter the messasge:&#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">,<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">,<\/span><span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      size_t len<span class=\"token operator\">&#061;<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len<span class=\"token operator\">&gt;<\/span><span class=\"token number\">0<\/span><span class=\"token operator\">&amp;&amp;<\/span>Shmadder<span class=\"token punctuation\">[<\/span>len<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n           Shmadder<span class=\"token punctuation\">[<\/span>len<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n      std<span class=\"token double-colon punctuation\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Please Enter the code(Press a:continue to send message\/Press x:stop sending):&#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n      std<span class=\"token double-colon punctuation\">::<\/span>cin<span class=\"token operator\">&gt;&gt;<\/span>c<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;x&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;write fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u90a3\u4e48\u8fd9\u91cc\u6211\u91c7\u53d6\u7684\u5c31\u662ffets\u51fd\u6570\u5f80\u5171\u4eab\u5185\u5b58\u4e2d\u5199\u5165\u6570\u636e&#xff0c;\u56e0\u4e3a\u5b83\u4f1a\u9996\u5148\u4f1a\u8bfb\u53d6\u7a7a\u683c&#xff0c;\u76f4\u5230\u8bfb\u53d6\u6362\u884c\u7b26\u7ed3\u675f&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6ce8\u610f\u7684\u5c31\u662ffets\u4f1a\u8bfb\u53d6\u6362\u884c\u7b26&#xff0c;\u5e76\u4e14\u8fd8\u4f1a\u518d\u6570\u636e\u7684\u6700\u540e\u6dfb\u52a0\u4e00\u4e2a\u2019\\\\0\u2019\u6807\u8bb0&#xff0c;&#xff0c;\u8fd9\u6837\u5c31\u80fd\u591f\u65b9\u4fbfB\u8fdb\u7a0b\u6765\u786e\u5b9a\u6d88\u606f\u7684\u7ed3\u5c3e&#xff0c;\u4f46\u662f\u7531\u4e8efets\u4f1a\u8bfb\u53d6\u6362\u884c\u7b26&#xff0c;\u800c\u5230\u65f6\u6211\u4eecB\u8fdb\u7a0b\u901a\u8fc7\u65e5\u5fd7\u6253\u5370\u7ec8\u7aef\u6d88\u606f\u7684\u65f6\u5019&#xff0c;\u4e5f\u4f1a\u8f93\u5165\u4e00\u4e2a\u6362\u884c\u7b26&#xff0c;\u6240\u4ee5\u8fd9\u91cc\u5c31\u8981\u5904\u7406\u672b\u5c3e\u7684\u6362\u884c\u7b26&#xff0c;\u7528\u2019\\\\0\u2019\u6765\u8986\u76d6<\/p>\n<p>\u800c\u8fd9\u91cc\u8981\u6ce8\u610f\u7684\u5c31\u662f\u6211\u4eec\u8fd9\u91cc\u5411\u7ba1\u9053\u6587\u4ef6\u5199\u5165\u5b57\u7b26c\u7684\u65f6\u5019&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u662f\u4ece\u6807\u51c6\u8f93\u5165\u4e2d\u8bfb\u53d6\u5c06\u5176\u8d4b\u503c\u7ed9\u5b57\u7b26c&#xff0c;\u800c\u8fd9\u91cc\u6211\u4eec\u6700\u540e\u4f1a\u6572\u4e00\u4e2a\u56de\u8f66\u952e\u4e5f\u5c31\u662f\u6362\u884c\u7b26&#xff0c;\u800c\u8fd9\u91cccin\u8bfb\u53d6\u6807\u51c6\u8f93\u5165\u548cfets\u4e0d\u540c\u7684\u662f&#xff0c;\u5b83\u8fd9\u91cc\u4e0d\u4f1a\u8bfb\u53d6\u6362\u884c\u7b26&#xff0c;\u8bfb\u5230\u6362\u884c\u7b26\u5c31\u7ed3\u675f&#xff0c;\u90a3\u4e48\u5c31\u4f1a\u5bfc\u81f4\u7f13\u51b2\u533a\u4f1a\u9057\u7559\u4e00\u4e2a\u6362\u884c\u7b26&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u5c31\u901a\u8fc7getchar\u6765\u5c06\u8fd9\u4e2a\u6362\u884c\u7b26\u7ed9\u8bfb\u53d6\u51fa\u6765<\/p>\n<h5>4.\u89e3\u9664\u6302\u8f7d<\/h5>\n<p>\u90a3\u4e48\u6700\u540e\u5269\u4e0b\u7684\u4e24\u4e2a\u73af\u8282\u5c31\u5f88\u7b80\u5355\u4e86&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5c31\u662f\u8c03\u7528shmdet\u63a5\u53e3\u89e3\u9664\u6302\u8f7d&#xff0c;\u7136\u540e\u5224\u65ad\u4e00\u4e0b\u8fd4\u56de\u503c&#xff0c;\u7136\u540e\u8fdb\u884c\u76f8\u5e94\u7684\u65e5\u5fd7\u6253\u5370<\/p>\n<p>n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmdt<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA detach FAILER:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA detach successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>5.\u6e05\u7406\u8d44\u6e90<\/h5>\n<p>\u90a3\u4e48\u6700\u540e\u4e00\u6b65\u5c31\u662f\u6e05\u7406\u8d44\u6e90&#xff0c;\u5305\u62ec\u4e4b\u524d\u521b\u5efa\u7684\u7ba1\u9053\u6587\u4ef6\u4ee5\u53ca\u5171\u4eab\u5185\u5b58<\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">unlink<\/span><span class=\"token punctuation\">(<\/span>FIFO_FILE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nn<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmctl<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token punctuation\">,<\/span>IPC_RMID<span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA shmctl fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA quit successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>processB.cpp<\/h4>\n<h5>1.\u83b7\u53d6process A\u8fdb\u7a0b\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u8fd9\u4e2a\u73af\u8282\u8c03\u7528GetShm\u6765\u83b7\u53d6\u8fdb\u7a0bA\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58&#xff0c;\u83b7\u53d6\u5176shmid<\/p>\n<p> <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">GetShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB get Shm successfully:%d&#034;<\/span><span class=\"token punctuation\">,<\/span>shmid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>2.\u5c06\u5171\u4eab\u5185\u5b58\u6302\u8f7d<\/h5>\n<p>\u90a3\u4e48\u8fd9\u4e2a\u73af\u8282\u548c\u4e0a\u6587\u7684process A\u6240\u505a\u7684\u5185\u5bb9\u662f\u4e00\u6837\u7684&#xff0c;\u5c31\u662f\u8c03\u7528shmat\u63a5\u53e3&#xff0c;\u7136\u540e\u83b7\u53d6\u8be5\u5171\u4eab\u5185\u5b58\u7684\u8d77\u59cb\u4f4d\u7f6e\u7684\u865a\u62df\u5730\u5740<\/p>\n<p> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB open fifo successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> Shmadder<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">shmat<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;attch fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB attch successfully:0x%x&#034;<\/span><span class=\"token punctuation\">,<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u8bfb\u53d6process A\u5411\u5171\u4eab\u5185\u5b58\u4e2d\u5199\u5165\u7684\u6570\u636e<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u7531\u4e8e\u5728\u4e0a\u6587&#xff0c;\u6211\u4ecb\u7ecd\u4e86\u8fdb\u7a0b\u53cc\u65b9\u7684\u8bfb\u5199\u540c\u6b65\u7684\u673a\u5236&#xff0c;\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8eB\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u90a3\u4e48\u5b83\u9996\u5148\u5c31\u8981\u8bfb\u53d6\u7ba1\u9053\u4e2d\u7684\u4fe1\u606f&#xff0c;\u786e\u5b9aA\u8fdb\u7a0b\u7684\u610f\u56fe&#xff0c;\u5982\u679c\u8bfb\u53d6\u5230\u7684\u5b57\u7b26\u662fa&#xff0c;\u8bf4\u660eA\u8fdb\u7a0b\u6b64\u65f6\u5411\u5171\u4eab\u5185\u5b58\u5199\u5165\u4e86\u4e00\u6761\u6d88\u606f&#xff0c;\u7136\u540e\u6211\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e34\u65f6\u7684\u5b57\u7b26\u6570\u7ec4&#xff0c;\u4ece\u5171\u4eab\u5185\u5b58\u4e2d\u8bfb\u53d61024\u4e2a\u5b57\u8282\u6570\u636e\u62f7\u8d1d\u5230\u8be5\u5b57\u7b26\u6570\u7ec4\u4e2d&#xff0c;\u800c\u5982\u679c\u6b64\u65f6\u8bfb\u5230\u7684\u5b57\u7b26\u662fx&#xff0c;\u8bf4\u660eA\u8fdb\u7a0b\u6b64\u65f6\u7ed3\u675f\u901a\u4fe1&#xff0c;\u90a3\u4e48\u5c31\u9000\u51fa\u5faa\u73af<\/p>\n<p> <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;x&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034; processB read fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span>Shmadder<span class=\"token punctuation\">,<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB get a message:%s&#034;<\/span><span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<h5>5.\u6e05\u7406\u8d44\u6e90<\/h5>\n<p>\u90a3\u4e48\u8fd9\u91cc\u5bf9\u4e8eB\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u90a3\u4e48\u5b83\u53ea\u9700\u8981\u5173\u95ed\u7ba1\u9053\u6587\u4ef6\u7684\u8bfb\u7aef\u4ee5\u53ca\u89e3\u9664\u6302\u8f7d\u5373\u53ef&#xff0c;\u56e0\u4e3a\u7ba1\u9053\u6587\u4ef6\u4ee5\u53ca\u5171\u4eab\u5185\u5b58\u7684\u5220\u9664\u90fd\u4ea4\u7ed9\u4e86A\u8fdb\u7a0b<\/p>\n<p>  <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmdt<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB detach fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB detach successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB quit successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h2>\u6e90\u7801<\/h2>\n<p>comm.hpp<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">once<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;sys\/ipc.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;sys\/shm.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&#034;log.hpp&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;cerrno&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;cstring&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;cstdio&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SHM_SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">4096<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">FIFO_FILE<\/span> <span class=\"token string\">&#034;.\/myfifo&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_FAILURE<\/span>  <span class=\"token expression\"><span class=\"token number\">1<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">ProjectId<\/span> <span class=\"token expression\"><span class=\"token number\">110<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string pathname<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\/home\/WangZhe&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> key<span class=\"token punctuation\">;<\/span><br \/>\nlog a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">CreatKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n       key<span class=\"token operator\">&#061;<\/span><span class=\"token function\">ftok<\/span><span class=\"token punctuation\">(<\/span>pathname<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_str<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>ProjectId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;ftoke\u8c03\u7528\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>size_t <span class=\"token function\">CreatShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> flag<span class=\"token operator\">&#061;<\/span>IPC_CREAT<span class=\"token operator\">|<\/span>IPC_EXCL<span class=\"token operator\">|<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n   <span class=\"token function\">CreatKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmget<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span>SHM_SIZE<span class=\"token punctuation\">,<\/span>flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;shemget fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">return<\/span> shmid<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nsize_t <span class=\"token function\">GetShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">CreatShm<\/span><span class=\"token punctuation\">(<\/span>IPC_CREAT<span class=\"token operator\">|<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token keyword\">return<\/span> shmid<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>log.hpp<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">pragma<\/span> <span class=\"token expression\">once<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;time.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;stdarg.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SIZE<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">screen<\/span> <span class=\"token expression\"><span class=\"token number\">0<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">File<\/span> <span class=\"token expression\"><span class=\"token number\">1<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">ClassFile<\/span> <span class=\"token expression\"><span class=\"token number\">2<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">enum<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n  info<span class=\"token punctuation\">,<\/span><br \/>\n  debug<span class=\"token punctuation\">,<\/span><br \/>\n  warning<span class=\"token punctuation\">,<\/span><br \/>\n  Fatal<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">log<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n   <span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n   std<span class=\"token double-colon punctuation\">::<\/span>string memssage<span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> method<span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n   <span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> _method<span class=\"token operator\">&#061;<\/span>screen<span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token operator\">:<\/span><span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span>_method<span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><\/p>\n<p>   <span class=\"token punctuation\">}<\/span><br \/>\n   <span class=\"token keyword\">void<\/span> <span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> leval<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> format<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> _leval<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">switch<\/span><span class=\"token punctuation\">(<\/span>leval<span class=\"token punctuation\">)<\/span><br \/>\n     <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> info<span class=\"token operator\">:<\/span><br \/>\n        _leval<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;info&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> debug<span class=\"token operator\">:<\/span><br \/>\n        _leval<span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;debug&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> warning<span class=\"token operator\">:<\/span><br \/>\n        _leval<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;warning&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> Fatal<span class=\"token operator\">:<\/span><br \/>\n        _leval<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;Fatal&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> timebuffer<span class=\"token punctuation\">[<\/span>SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        time_t t<span class=\"token operator\">&#061;<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">tm<\/span><span class=\"token operator\">*<\/span> localTime<span class=\"token operator\">&#061;<\/span><span class=\"token function\">localtime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">snprintf<\/span><span class=\"token punctuation\">(<\/span>timebuffer<span class=\"token punctuation\">,<\/span>SIZE<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;[%d-%d-%d-%d:%d]&#034;<\/span><span class=\"token punctuation\">,<\/span>localTime<span class=\"token operator\">-&gt;<\/span>tm_year<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1900<\/span><span class=\"token punctuation\">,<\/span>localTime<span class=\"token operator\">-&gt;<\/span>tm_mon<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>localTime<span class=\"token operator\">-&gt;<\/span>tm_mday<span class=\"token punctuation\">,<\/span>localTime<span class=\"token operator\">-&gt;<\/span>tm_hour<span class=\"token punctuation\">,<\/span>localTime<span class=\"token operator\">-&gt;<\/span>tm_min<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> rightbuffer<span class=\"token punctuation\">[<\/span>SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        va_list arg<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">va_start<\/span><span class=\"token punctuation\">(<\/span>arg<span class=\"token punctuation\">,<\/span>format<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">vsnprintf<\/span><span class=\"token punctuation\">(<\/span>rightbuffer<span class=\"token punctuation\">,<\/span>SIZE<span class=\"token punctuation\">,<\/span>format<span class=\"token punctuation\">,<\/span>arg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> finalbuffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">*<\/span>SIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">snprintf<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;[%s]%s:%s&#034;<\/span><span class=\"token punctuation\">,<\/span>_leval<span class=\"token punctuation\">,<\/span>timebuffer<span class=\"token punctuation\">,<\/span>rightbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">switch<\/span><span class=\"token punctuation\">(<\/span>method<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> screen<span class=\"token operator\">:<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span>finalbuffer<span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> File<span class=\"token operator\">:<\/span><br \/>\n             fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;log.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_WRONLY<span class=\"token operator\">|<\/span>O_CREAT<span class=\"token operator\">|<\/span>O_TRUNC<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n             <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token operator\">&gt;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n             <span class=\"token punctuation\">{<\/span><br \/>\n               <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>finalbuffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n               <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n             <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> ClassFile<span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token keyword\">switch<\/span><span class=\"token punctuation\">(<\/span>leval<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                 <span class=\"token keyword\">case<\/span> info<span class=\"token operator\">:<\/span><br \/>\n                  fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;log\/info.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_WRONLY<span class=\"token operator\">|<\/span>O_CREAT<span class=\"token operator\">|<\/span>O_TRUNC<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>finalbuffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">case<\/span> debug<span class=\"token operator\">:<\/span><br \/>\n                  fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;log\/debug.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_WRONLY<span class=\"token operator\">|<\/span>O_CREAT<span class=\"token operator\">|<\/span>O_TRUNC<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>finalbuffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">case<\/span> warning<span class=\"token operator\">:<\/span><br \/>\n                fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;log\/Warning.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_WRONLY<span class=\"token operator\">|<\/span>O_CREAT<span class=\"token operator\">|<\/span>O_TRUNC<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>finalbuffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">case<\/span> Fatal<span class=\"token operator\">:<\/span><br \/>\n                  fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;log\/Fatal.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_WRONLY<span class=\"token operator\">|<\/span>O_CREAT<span class=\"token operator\">|<\/span>O_TRUNC<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                 <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token operator\">&gt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n               <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span>finalbuffer<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>finalbuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n               <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>processA.cpp<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&#034;comm.hpp&#034;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">CreatShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA creat Shm successfully:%d&#034;<\/span><span class=\"token punctuation\">,<\/span>shmid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">mkfifo<\/span><span class=\"token punctuation\">(<\/span>FIFO_FILE<span class=\"token punctuation\">,<\/span><span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;creat fifo fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA creat fifo successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA is waiting for processB open&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span>FIFO_FILE<span class=\"token punctuation\">,<\/span>O_WRONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA open fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA open fifo successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> Shmadder<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">shmat<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n     a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA attach Fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA attch successfully:0x%x&#034;<\/span><span class=\"token punctuation\">,<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      std<span class=\"token double-colon punctuation\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Please Enter the messasge:&#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">,<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">,<\/span><span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      size_t len<span class=\"token operator\">&#061;<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len<span class=\"token operator\">&gt;<\/span><span class=\"token number\">0<\/span><span class=\"token operator\">&amp;&amp;<\/span>Shmadder<span class=\"token punctuation\">[<\/span>len<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n           Shmadder<span class=\"token punctuation\">[<\/span>len<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n      std<span class=\"token double-colon punctuation\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Please Enter the code(Press a:continue to send message\/Press x:stop sending):&#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n      std<span class=\"token double-colon punctuation\">::<\/span>cin<span class=\"token operator\">&gt;&gt;<\/span>c<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;x&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">{<\/span><br \/>\n         a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;write fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n      <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token function\">unlink<\/span><span class=\"token punctuation\">(<\/span>FIFO_FILE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmdt<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA detach FAILER:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA detach successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmctl<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token punctuation\">,<\/span>IPC_RMID<span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA shmctl fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processA quit successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>processB.cpp<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span><span class=\"token string\">&#034;comm.hpp&#034;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> shmid<span class=\"token operator\">&#061;<\/span><span class=\"token function\">GetShm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB get Shm successfully:%d&#034;<\/span><span class=\"token punctuation\">,<\/span>shmid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd<span class=\"token operator\">&#061;<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span>FIFO_FILE<span class=\"token punctuation\">,<\/span>O_RDONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n   <span class=\"token punctuation\">{<\/span><br \/>\n      a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB open fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB open fifo successfully&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> Shmadder<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">shmat<\/span><span class=\"token punctuation\">(<\/span>shmid<span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;attch fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>debug<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;processB attch successfully:0x%x&#034;<\/span><span class=\"token punctuation\">,<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;x&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            a<span class=\"token punctuation\">.<\/span><span class=\"token function\">logmessage<\/span><span class=\"token punctuation\">(<\/span>Fatal<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034; processB read fail:%s&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span>EXIT_FAILURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n 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message:%s&#034;<\/span><span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token function\">shmdt<\/span><span class=\"token punctuation\">(<\/span>Shmadder<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token 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