{"id":33186,"date":"2025-04-27T02:52:15","date_gmt":"2025-04-26T18:52:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/33186.html"},"modified":"2025-04-27T02:52:15","modified_gmt":"2025-04-26T18:52:15","slug":"20242817-%e6%9d%8e%e8%87%bb-%e8%af%be%e4%b8%8a%e6%b5%8b%e8%af%95%ef%bc%9a%e4%bf%a1%e5%8f%b7%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/33186.html","title":{"rendered":"20242817-\u674e\u81fb-\u8bfe\u4e0a\u6d4b\u8bd5\uff1a\u4fe1\u53f7\u5904\u7406"},"content":{"rendered":"

\u4e00\u3001\u5b9e\u9a8c\u8981\u6c42<\/h2>\n
  • \u5728 Ubuntu \u6216 openEuler \u4e2d\u5b8c\u6210\u4efb\u52a1（\u63a8\u8350openEuler）<\/li>\n
  • \u5199\u4e00\u4e2a\u7236\u5b50\u8fdb\u7a0b\u901a\u4fe1\u7a0b\u5e8f\u3002\u7236\u8fdb\u7a0b\u6bcf2\u79d2\u5411\u5b50\u8fdb\u7a0b\u53d1\u9001SIGUSR2\u4fe1\u53f7\u3002\u5b50\u8fdb\u7a0b\u7edf\u8ba1\u6536\u5230\u4fe1\u53f7\u7684\u6b21\u6570，\u5e76\u5728\u6536\u5230\u7b2c5\u6b21\u65f6\u8f93\u51fa\u201cReceived 5 signals, child exit!\u201d，\u7136\u540e\u9000\u51fa\u3002\u7236\u8fdb\u7a0b\u68c0\u6d4b\u5230\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e（\u53ef\u901a\u8fc7SIGCHLD\u6216wait），\u8f93\u51fa\u201cChild terminated.\u201d\u5e76\u81ea\u8eab\u9000\u51fa\u3002<\/li>\n
  • \u63d0\u4ea4\u4ee3\u7801\u548c\u8fd0\u884c\u7ed3\u679c\u622a\u56fe\u6216\u6587\u672c<\/li>\n

    \u4e8c\u3001\u5b9e\u9a8c\u8fc7\u7a0b<\/h2>\n

    1\u3001\u7a0b\u5e8f\u5b9e\u73b0<\/h3>\n

    test.c<\/p>\n

    #<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdlib.h><\/span><\/span>
    \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
    \n#<\/span>include<\/span> <signal.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/wait.h><\/span><\/span><\/p>\n

    int<\/span> signal_count =<\/span> 0<\/span>;<\/span> \/\/ \u8bb0\u5f55\u63a5\u6536\u5230\u7684SIGUSR2\u4fe1\u53f7\u7684\u6b21\u6570<\/span><\/p>\n

    \/\/ \u5b50\u8fdb\u7a0b\u63a5\u6536\u5230SIGUSR2\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570<\/span>
    \nvoid<\/span> sigusr2_handler<\/span>(<\/span>int<\/span> sig)<\/span> {<\/span>
    \n signal_count++<\/span>;<\/span> \/\/ \u6bcf\u63a5\u6536\u5230\u4e00\u4e2aSIGUSR2\u4fe1\u53f7，\u8ba1\u6570\u5668\u52a0\u4e00<\/span>
    \n printf<\/span>(<\/span>"Received signal %d times\\\\n"<\/span>,<\/span> signal_count)<\/span>;<\/span><\/p>\n

    \/\/ \u5982\u679c\u63a5\u6536\u5230\u7b2c5\u6b21\u4fe1\u53f7，\u5b50\u8fdb\u7a0b\u9000\u51fa<\/span>
    \n if<\/span> (<\/span>signal_count ==<\/span> 5<\/span>)<\/span> {<\/span>
    \n printf<\/span>(<\/span>"Received 5 signals, child exit!\\\\n"<\/span>)<\/span>;<\/span>
    \n exit<\/span>(<\/span>0<\/span>)<\/span>;<\/span> \/\/ \u5b50\u8fdb\u7a0b\u9000\u51fa<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
    \n pid_t<\/span> pid =<\/span> fork<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u521b\u5efa\u5b50\u8fdb\u7a0b<\/span><\/p>\n

    if<\/span> (<\/span>pid <<\/span> 0<\/span>)<\/span> {<\/span>
    \n perror<\/span>(<\/span>"fork failed"<\/span>)<\/span>;<\/span>
    \n exit<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    if<\/span> (<\/span>pid ==<\/span> 0<\/span>)<\/span> {<\/span> \/\/ \u5b50\u8fdb\u7a0b<\/span>
    \n \/\/ \u8bbe\u7f6eSIGUSR2\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570<\/span>
    \n signal<\/span>(<\/span>SIGUSR2,<\/span> sigusr2_handler)<\/span>;<\/span><\/p>\n

    \/\/ \u5b50\u8fdb\u7a0b\u65e0\u9650\u5faa\u73af，\u7b49\u5f85\u4fe1\u53f7<\/span>
    \n while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>
    \n pause<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u7b49\u5f85\u4fe1\u53f7<\/span>
    \n }<\/span>
    \n }<\/span> else<\/span> {<\/span> \/\/ \u7236\u8fdb\u7a0b<\/span>
    \n sleep<\/span>(<\/span>1<\/span>)<\/span>;<\/span> \/\/ \u7ed9\u5b50\u8fdb\u7a0b\u4e00\u4e9b\u65f6\u95f4\u6765\u8bbe\u7f6e\u4fe1\u53f7\u5904\u7406<\/span><\/p>\n

    \/\/ \u6bcf2\u79d2\u5411\u5b50\u8fdb\u7a0b\u53d1\u9001SIGUSR2\u4fe1\u53f7<\/span>
    \n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 5<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n sleep<\/span>(<\/span>2<\/span>)<\/span>;<\/span> \/\/ \u6bcf2\u79d2\u53d1\u9001\u4e00\u6b21<\/span>
    \n kill<\/span>(<\/span>pid,<\/span> SIGUSR2)<\/span>;<\/span> \/\/ \u53d1\u9001SIGUSR2\u4fe1\u53f7\u7ed9\u5b50\u8fdb\u7a0b<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u7b49\u5f85\u5b50\u8fdb\u7a0b\u9000\u51fa（\u901a\u8fc7wait\u6216SIGCHLD\u4fe1\u53f7）<\/span>
    \n int<\/span> status;<\/span>
    \n waitpid<\/span>(<\/span>pid,<\/span> &<\/span>status,<\/span> 0<\/span>)<\/span>;<\/span> \/\/ \u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f<\/span><\/p>\n

    \/\/ \u5b50\u8fdb\u7a0b\u9000\u51fa\u540e，\u7236\u8fdb\u7a0b\u8f93\u51fa\u4fe1\u606f\u5e76\u9000\u51fa<\/span>
    \n printf<\/span>(<\/span>"Child terminated.\\\\n"<\/span>)<\/span>;<\/span><\/p>\n

    exit<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    2\u3001\u7a0b\u5e8f\u89e3\u6790<\/h3>\n
  • \n

    \u4fe1\u53f7\u5904\u7406：<\/p>\n

      \n
    • \u5b50\u8fdb\u7a0b\u4f7f\u7528 signal(SIGUSR2, sigusr2_handler) \u6765\u8bbe\u7f6e SIGUSR2 \u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570\u3002\u5f53\u5b50\u8fdb\u7a0b\u63a5\u6536\u5230 SIGUSR2 \u4fe1\u53f7\u65f6，sigusr2_handler \u51fd\u6570\u4f1a\u88ab\u8c03\u7528，\u8bb0\u5f55\u4fe1\u53f7\u63a5\u6536\u7684\u6b21\u6570，\u5e76\u5728\u63a5\u6536\u5230\u7b2c 5 \u6b21\u4fe1\u53f7\u65f6\u9000\u51fa\u5b50\u8fdb\u7a0b\u3002<\/li>\n
    • \u7236\u8fdb\u7a0b\u6bcf\u9694 2 \u79d2\u901a\u8fc7 kill(pid, SIGUSR2) \u5411\u5b50\u8fdb\u7a0b\u53d1\u9001\u4e00\u4e2a SIGUSR2 \u4fe1\u53f7\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \n

      \u7236\u5b50\u8fdb\u7a0b\u901a\u4fe1：<\/p>\n

        \n
      • \u7236\u8fdb\u7a0b\u901a\u8fc7 fork() \u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u3002\u5982\u679c fork() \u8fd4\u56de 0，\u5219\u662f\u5b50\u8fdb\u7a0b；\u5982\u679c\u8fd4\u56de\u4e00\u4e2a\u6b63\u6570，\u5219\u662f\u7236\u8fdb\u7a0b，\u5e76\u4e14\u8fd4\u56de\u503c\u662f\u5b50\u8fdb\u7a0b\u7684 PID\u3002<\/li>\n
      • \u7236\u8fdb\u7a0b\u4f7f\u7528 kill() \u5411\u5b50\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7，\u5b50\u8fdb\u7a0b\u5219\u4f7f\u7528 pause() \u6765\u7b49\u5f85\u5e76\u5904\u7406\u63a5\u6536\u5230\u7684\u4fe1\u53f7\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \n

        \u5b50\u8fdb\u7a0b\u9000\u51fa：<\/p>\n

          \n
        • \u5b50\u8fdb\u7a0b\u5728\u63a5\u6536\u5230\u7b2c 5 \u6b21 SIGUSR2 \u4fe1\u53f7\u65f6，\u4f1a\u8f93\u51fa \u201cReceived 5 signals, child exit!\u201d \u5e76\u8c03\u7528 exit(0) \u9000\u51fa\u3002<\/li>\n<\/ul>\n<\/li>\n
        • \n

          \u7236\u8fdb\u7a0b\u7b49\u5f85：<\/p>\n

            \n
          • \u7236\u8fdb\u7a0b\u901a\u8fc7 waitpid(pid, &status, 0) \u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\u3002\u5b50\u8fdb\u7a0b\u7ed3\u675f\u540e，\u7236\u8fdb\u7a0b\u4f1a\u8f93\u51fa \u201cChild terminated.\u201d \u5e76\u9000\u51fa\u3002<\/li>\n<\/ul>\n<\/li>\n

            3\u3001\u7f16\u8bd1\u548c\u8fd0\u884c<\/h3>\n

            \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

              \n
            • \u6bcf\u9694 2 \u79d2，\u7236\u8fdb\u7a0b\u4f1a\u53d1\u9001\u4e00\u6b21 SIGUSR2 \u4fe1\u53f7\u7ed9\u5b50\u8fdb\u7a0b\u3002<\/li>\n
            • \u5b50\u8fdb\u7a0b\u6536\u5230 5 \u6b21\u4fe1\u53f7\u540e\u8f93\u51fa\u201cReceived 5 signals, child exit!\u201d\u5e76\u9000\u51fa\u3002<\/li>\n
            • \u7236\u8fdb\u7a0b\u7b49\u5f85\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\u8f93\u51fa\u201cChild terminated.\u201d\u5e76\u7ed3\u675f\u3002<\/li>\n<\/ul>\n

              5\u3001Gitee\u4ed3\u5e93<\/h3>\n

              \u4ed3\u5e93\u94fe\u63a5：https:\/\/gitee.com\/li-zhen1215\/homework\/tree\/master\/Week8\/keshang3<\/p>\n

              \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

              \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb452\u6b21\uff0c\u70b9\u8d5e3\u6b21\uff0c\u6536\u85cf7\u6b21\u3002\u4ed3\u5e93\u94fe\u63a5\uff1ahttps:\/\/gitee.com\/li-zhen1215\/homework\/tree\/master\/Week8\/keshang3\u3002<\/p>\n","protected":false},"author":2,"featured_media":33184,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2710],"topic":[],"class_list":["post-33186","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-2710"],"yoast_head":"\n20242817-\u674e\u81fb-\u8bfe\u4e0a\u6d4b\u8bd5\uff1a\u4fe1\u53f7\u5904\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/33186.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"20242817-\u674e\u81fb-\u8bfe\u4e0a\u6d4b\u8bd5\uff1a\u4fe1\u53f7\u5904\u7406 - 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