{"id":22316,"date":"2025-04-19T05:51:27","date_gmt":"2025-04-18T21:51:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/22316.html"},"modified":"2025-04-19T05:51:27","modified_gmt":"2025-04-18T21:51:27","slug":"%e5%9f%ba%e4%ba%8elinux%e7%9a%84%e5%a4%9a%e8%bf%9b%e7%a8%8b%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%ae%be%e8%ae%a1%e4%b8%8e%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/22316.html","title":{"rendered":"\u57fa\u4e8eLinux\u7684\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668\u8bbe\u8ba1\u4e0e\u5b9e\u73b0"},"content":{"rendered":"<h2>\u57fa\u4e8eLinux\u7684\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668\u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/h2>\n<h3>\u7b80\u4ecb<\/h3>\n<p>\u672c\u9879\u76ee\u5b9e\u73b0\u4e86\u4e00\u4e2a\u57fa\u4e8eLinux\u7684\u591a\u8fdb\u7a0b\u5e76\u53d1\u670d\u52a1\u5668\u6846\u67b6&#xff0c;\u91c7\u7528\u8fdb\u7a0b\u6c60\u6280\u672f\u63d0\u9ad8\u670d\u52a1\u5668\u5e76\u53d1\u5904\u7406\u80fd\u529b&#xff0c;\u4e3b\u8981\u7528\u4e8e\u6587\u4ef6\u4f20\u8f93\u670d\u52a1\u3002\u8be5\u6846\u67b6\u5229\u7528\u4e86Unix\u57df\u5957\u63a5\u5b57\u3001\u7ba1\u9053\u901a\u4fe1\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f20\u9012\u548cepoll\u673a\u5236\u7b49\u6280\u672f&#xff0c;\u5b9e\u73b0\u4e86\u9ad8\u6548\u7684\u4efb\u52a1\u5206\u53d1\u548c\u5e76\u53d1\u5904\u7406\u3002<\/p>\n<h3>\u7cfb\u7edf\u67b6\u6784<\/h3>\n<p>\u8be5\u670d\u52a1\u5668\u91c7\u7528\u4e3b-\u4ece\u8fdb\u7a0b\u6a21\u578b&#xff08;Master-Worker\u6a21\u5f0f&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u8fdb\u7a0b&#xff08;Master\u8fdb\u7a0b&#xff09;&#xff1a;\u8d1f\u8d23\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u5e76\u5c06\u8fde\u63a5\u5206\u53d1\u7ed9\u7a7a\u95f2\u7684\u5b50\u8fdb\u7a0b<\/li>\n<li>\u5b50\u8fdb\u7a0b&#xff08;Worker\u8fdb\u7a0b&#xff09;&#xff1a;\u8d1f\u8d23\u5904\u7406\u5177\u4f53\u7684\u4e1a\u52a1\u903b\u8f91&#xff0c;\u5982\u6587\u4ef6\u4f20\u8f93<\/li>\n<\/ul>\n<p>\u7cfb\u7edf\u67b6\u6784\u56fe\u5982\u4e0b&#xff1a;<\/p>\n<p>&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<br 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&#043;&#8212;&#8211;&#043;<\/p>\n<h3>\u5173\u952e\u6280\u672f<\/h3>\n<h4>\u8fdb\u7a0b\u6c60\u8bbe\u8ba1<\/h4>\n<p>\u8fdb\u7a0b\u6c60\u662f\u9884\u5148\u521b\u5efa\u4e00\u7ec4\u5b50\u8fdb\u7a0b&#xff0c;\u8fd9\u4e9b\u8fdb\u7a0b\u7b49\u5f85\u4e3b\u8fdb\u7a0b\u5206\u914d\u4efb\u52a1\u3002\u6b64\u8bbe\u8ba1\u53ef\u907f\u514d\u9891\u7e41\u521b\u5efa\u548c\u9500\u6bc1\u8fdb\u7a0b\u7684\u5f00\u9500&#xff0c;\u63d0\u9ad8\u7cfb\u7edf\u54cd\u5e94\u901f\u5ea6\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u8fdb\u7a0b\u72b6\u6001\u5b9a\u4e49<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">worker_status<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    FREE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u7a7a\u95f2\u72b6\u6001<\/span><br \/>\n    BUSY       <span class=\"token comment\">\/\/ \u5fd9\u788c\u72b6\u6001<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> worker_status_t<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8fdb\u7a0b\u6570\u636e\u7ed3\u6784<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    pid_t pid<span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0bID<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> pipefd<span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">\/\/ \u4e0e\u7236\u8fdb\u7a0b\u901a\u4fe1\u7684\u7ba1\u9053<\/span><br \/>\n    worker_status_t status<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b\u5f53\u524d\u72b6\u6001<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> process_data_t<span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u8fdb\u7a0b\u95f4\u901a\u4fe1<\/h4>\n<p>\u672c\u9879\u76ee\u4f7f\u7528Unix\u57df\u5957\u63a5\u5b57&#xff08;socketpair&#xff09;\u5b9e\u73b0\u7236\u5b50\u8fdb\u7a0b\u95f4\u7684\u53cc\u5411\u901a\u4fe1&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">makechild<\/span><span class=\"token punctuation\">(<\/span>process_data_t <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> num<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> num<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> pipefd<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">socketpair<\/span><span class=\"token punctuation\">(<\/span>AF_LOCAL<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> pipefd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u521b\u5efa\u5168\u53cc\u5de5\u901a\u4fe1\u7ba1\u9053<\/span><br \/>\n        pid_t pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pid <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 function\">close<\/span><span class=\"token punctuation\">(<\/span>pipefd<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b\u5173\u95ed\u5199\u7aef<\/span><br \/>\n            <span class=\"token function\">handleTask<\/span><span class=\"token punctuation\">(<\/span>pipefd<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><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><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>pipefd<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7236\u8fdb\u7a0b\u5173\u95ed\u8bfb\u7aef<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4fdd\u5b58\u5b50\u8fdb\u7a0b\u4fe1\u606f<\/span><br \/>\n            p<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid <span class=\"token operator\">&#061;<\/span> pid<span class=\"token punctuation\">;<\/span><br \/>\n            p<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pipefd <span class=\"token operator\">&#061;<\/span> pipefd<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            p<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;<\/span> FREE<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f20\u9012<\/h4>\n<p>\u4f7f\u7528 sendmsg\/recvmsg \u7cfb\u7edf\u8c03\u7528&#xff0c;\u901a\u8fc7 SCM_RIGHTS \u63a7\u5236\u6d88\u606f\u4f20\u9012\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5b9e\u73b0\u7236\u8fdb\u7a0b\u5c06\u5ba2\u6237\u7aef\u8fde\u63a5\u4f20\u9012\u7ed9\u5b50\u8fdb\u7a0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">sendfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> pipefd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/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 keyword\">struct<\/span> <span class=\"token class-name\">iovec<\/span> iov<span class=\"token punctuation\">;<\/span><br \/>\n    iov<span class=\"token punctuation\">.<\/span>iov_base <span class=\"token operator\">&#061;<\/span> buf<span class=\"token punctuation\">;<\/span><br \/>\n    iov<span class=\"token punctuation\">.<\/span>iov_len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    size_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">CMSG_LEN<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">cmsghdr<\/span> <span class=\"token operator\">*<\/span>cmsg <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">cmsghdr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">calloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    cmsg<span class=\"token operator\">-&gt;<\/span>cmsg_len <span class=\"token operator\">&#061;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n    cmsg<span class=\"token operator\">-&gt;<\/span>cmsg_type <span class=\"token operator\">&#061;<\/span> SCM_RIGHTS<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u7c7b\u578b\u4e3a\u4f20\u9012\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    cmsg<span class=\"token operator\">-&gt;<\/span>cmsg_level <span class=\"token operator\">&#061;<\/span> SOL_SOCKET<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">CMSG_DATA<\/span><span class=\"token punctuation\">(<\/span>cmsg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> fd<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u586b\u5165\u8981\u4f20\u9012\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">msghdr<\/span> msg<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>msg<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    msg<span class=\"token punctuation\">.<\/span>msg_iov <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>iov<span class=\"token punctuation\">;<\/span><br \/>\n    msg<span class=\"token punctuation\">.<\/span>msg_iovlen <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    msg<span class=\"token punctuation\">.<\/span>msg_control <span class=\"token operator\">&#061;<\/span> cmsg<span class=\"token punctuation\">;<\/span><br \/>\n    msg<span class=\"token punctuation\">.<\/span>msg_controllen <span class=\"token operator\">&#061;<\/span> len<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">sendmsg<\/span><span class=\"token punctuation\">(<\/span>pipefd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>msg<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\">free<\/span><span class=\"token punctuation\">(<\/span>cmsg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>I\/O\u591a\u8def\u590d\u7528<\/h4>\n<p>\u4f7f\u7528epoll\u673a\u5236\u76d1\u542c\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u63d0\u9ad8I\/O\u6548\u7387&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">epolladdfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> ev<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">bzero<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76d1\u542c\u8bfb\u4e8b\u4ef6<\/span><br \/>\n    ev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">ERROR_CHECK<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;epoll_ctl error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u5de5\u4f5c\u6d41\u7a0b<\/h3>\n<li>\n<p>\u521d\u59cb\u5316\u9636\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u8fdb\u7a0b\u521b\u5efa\u6307\u5b9a\u6570\u91cf\u7684\u5b50\u8fdb\u7a0b<\/li>\n<li>\u6bcf\u4e2a\u5b50\u8fdb\u7a0b\u4e0e\u4e3b\u8fdb\u7a0b\u5efa\u7acb\u7ba1\u9053\u901a\u4fe1<\/li>\n<li>\u5b50\u8fdb\u7a0b\u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af&#xff0c;\u7b49\u5f85\u4efb\u52a1<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8fde\u63a5\u5904\u7406\u9636\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u8fdb\u7a0b\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5<\/li>\n<li>\u5ba2\u6237\u7aef\u8bf7\u6c42\u5230\u8fbe\u65f6&#xff0c;\u4e3b\u8fdb\u7a0b\u901a\u8fc7epoll\u76d1\u6d4b\u5230\u8fde\u63a5\u4e8b\u4ef6<\/li>\n<li>\u4e3b\u8fdb\u7a0b\u63a5\u53d7\u8fde\u63a5&#xff0c;\u83b7\u53d6\u5ba2\u6237\u7aefsocket\u63cf\u8ff0\u7b26<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u4efb\u52a1\u5206\u53d1\u9636\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u8fdb\u7a0b\u5bfb\u627e\u7a7a\u95f2\u5b50\u8fdb\u7a0b<\/li>\n<li>\u4e3b\u8fdb\u7a0b\u901a\u8fc7sendfd\u5c06\u5ba2\u6237\u7aefsocket\u63cf\u8ff0\u7b26\u4f20\u9012\u7ed9\u5b50\u8fdb\u7a0b<\/li>\n<li>\u4e3b\u8fdb\u7a0b\u5c06\u5b50\u8fdb\u7a0b\u72b6\u6001\u8bbe\u7f6e\u4e3aBUSY<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u4efb\u52a1\u5904\u7406\u9636\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\u5b50\u8fdb\u7a0b\u901a\u8fc7recvfd\u63a5\u6536\u5ba2\u6237\u7aefsocket\u63cf\u8ff0\u7b26<\/li>\n<li>\u5b50\u8fdb\u7a0b\u5904\u7406\u6587\u4ef6\u4f20\u8f93\u4e1a\u52a1<\/li>\n<li>\u4efb\u52a1\u5b8c\u6210\u540e&#xff0c;\u5b50\u8fdb\u7a0b\u5173\u95ed\u5ba2\u6237\u7aefsocket\u63cf\u8ff0\u7b26<\/li>\n<li>\u5b50\u8fdb\u7a0b\u5411\u4e3b\u8fdb\u7a0b\u53d1\u9001\u5b8c\u6210\u4fe1\u53f7<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u4efb\u52a1\u5b8c\u6210\u9636\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\u4e3b\u8fdb\u7a0b\u63a5\u6536\u5230\u5b50\u8fdb\u7a0b\u7684\u5b8c\u6210\u4fe1\u53f7<\/li>\n<li>\u4e3b\u8fdb\u7a0b\u5c06\u5b50\u8fdb\u7a0b\u72b6\u6001\u91cd\u65b0\u8bbe\u7f6e\u4e3aFREE<\/li>\n<li>\u5b50\u8fdb\u7a0b\u53ef\u4ee5\u7ee7\u7eed\u5904\u7406\u65b0\u7684\u4efb\u52a1<\/li>\n<\/ul>\n<\/li>\n<h3>\u6587\u4ef6\u4f20\u8f93\u5b9e\u73b0<\/h3>\n<p>\u6587\u4ef6\u4f20\u8f93\u91c7\u7528\u5206\u5757\u4f20\u8f93\u65b9\u5f0f&#xff0c;\u786e\u4fdd\u5927\u6587\u4ef6\u4e5f\u80fd\u9ad8\u6548\u4f20\u8f93&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">transferfile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> peerfd<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6253\u5f00\u6587\u4ef6<\/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>FILENAME<span class=\"token punctuation\">,<\/span> O_RDWR<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0777<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6587\u4ef6\u540d<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> namelen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>FILENAME<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sendn<\/span><span class=\"token punctuation\">(<\/span>peerfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>namelen<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>namelen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sendn<\/span><span class=\"token punctuation\">(<\/span>peerfd<span class=\"token punctuation\">,<\/span> FILENAME<span class=\"token punctuation\">,<\/span> namelen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u6587\u4ef6\u5927\u5c0f<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">stat<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fstat<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>st<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sendn<\/span><span class=\"token punctuation\">(<\/span>peerfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>st<span class=\"token punctuation\">.<\/span>st_size<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>st<span class=\"token punctuation\">.<\/span>st_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5206\u5757\u53d1\u9001\u6587\u4ef6\u5185\u5bb9<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/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    off_t sent <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>sent <span class=\"token operator\">&lt;<\/span> st<span class=\"token punctuation\">.<\/span>st_size<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sendn<\/span><span class=\"token punctuation\">(<\/span>peerfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ret<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u53d1\u9001\u5757\u5927\u5c0f<\/span><br \/>\n        <span class=\"token function\">sendn<\/span><span class=\"token punctuation\">(<\/span>peerfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53d1\u9001\u5757\u6570\u636e<\/span><br \/>\n        sent <span class=\"token operator\">&#043;&#061;<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\r\u53d1\u9001\u8fdb\u5ea6: %.2f%%&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span><span class=\"token punctuation\">)<\/span>sent <span class=\"token operator\">*<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">\/<\/span> st<span class=\"token punctuation\">.<\/span>st_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">fflush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stdout<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n\u53d1\u9001\u5b8c\u6210\\\\n&#034;<\/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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u5ba2\u6237\u7aef\u5b9e\u73b0<\/h3>\n<p>\u5ba2\u6237\u7aef\u8fde\u63a5\u670d\u52a1\u5668\u5e76\u63a5\u6536\u6587\u4ef6&#xff1a;<\/p>\n<p><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 comment\">\/\/ \u521b\u5efasocket\u5e76\u8fde\u63a5\u670d\u52a1\u5668<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> clientfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<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 keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    addr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    addr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;192.168.34.xxx&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6587\u4ef6\u540d<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> filename<span class=\"token punctuation\">[<\/span><span class=\"token number\">20<\/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 keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/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\">recv<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">,<\/span> filename<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6587\u4ef6\u5927\u5c0f<\/span><br \/>\n    off_t filesize <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>filesize<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>filesize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6587\u4ef6\u5185\u5bb9<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/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 keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span>filename<span class=\"token punctuation\">,<\/span> O_RDWR <span class=\"token operator\">|<\/span> O_CREAT<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0777<\/span><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 number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>clientfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> len<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\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>clientfd<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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u7f16\u8bd1\u4e0e\u8fd0\u884c<\/h3>\n<h4>\u7f16\u8bd1<\/h4>\n<p>\u9879\u76ee\u4f7f\u7528makefile\u8fdb\u884c\u7f16\u8bd1\u7ba1\u7406&#xff1a;<\/p>\n<p># \u7f16\u8bd1\u6240\u6709\u76ee\u6807<br \/>\nall: server client01<\/p>\n<p># \u7f16\u8bd1\u670d\u52a1\u5668<br \/>\nserver: server.o transfer.o sendfd.o main.o child.o<br \/>\ng&#043;&#043; $^ -o $&#064;<\/p>\n<p># \u7f16\u8bd1\u5ba2\u6237\u7aef<br \/>\nclient01: client01.cpp<br \/>\ng&#043;&#043; $^ -o $&#064;<\/p>\n<p># \u6e05\u7406\u7f16\u8bd1\u4ea7\u7269<br \/>\nclean:<br \/>\nrm -rf *.o server client01<\/p>\n<h4>\u8fd0\u884c<\/h4>\n<li>\u542f\u52a8\u670d\u52a1\u5668&#xff1a;<\/li>\n<p>.\/server <span class=\"token number\">192.168<\/span>.34.xxx <span class=\"token number\">8080<\/span> <span class=\"token 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