{"id":85031,"date":"2026-07-26T22:18:45","date_gmt":"2026-07-26T14:18:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/85031.html"},"modified":"2026-07-26T22:18:45","modified_gmt":"2026-07-26T14:18:45","slug":"%e7%bd%91%e7%bb%9c%e9%80%9a%e4%bf%a1-tcp%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8-io%e6%a8%a1%e5%9e%8b-%e5%a4%9a%e8%b7%af%e5%a4%8d%e7%94%a8io%e7%9b%b8%e5%85%b3%e5%87%bd%e6%95%b0%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/85031.html","title":{"rendered":"\u7f51\u7edc\u901a\u4fe1 --- TCP\u5e76\u53d1\u670d\u52a1\u5668\/IO\u6a21\u578b\/\u591a\u8def\u590d\u7528IO\u76f8\u5173\u51fd\u6570\u63a5\u53e3 --- Linux"},"content":{"rendered":"<h2>1\u3001TCP\u5e76\u53d1\u670d\u52a1\u5668<\/h2>\n<h3>&#xff11;.&#xff11;TCP\u5e76\u53d1\u670d\u52a1\u5668\u95ee\u9898<\/h3>\n<p>\u670d\u52a1\u7aef\u9700\u8981\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6&#xff0c;\u6838\u5fc3\u77db\u76fe&#xff1a;<\/p>\n<ul>\n<li>accept()&#xff1a;\u963b\u585e\u7b49\u5f85\u65b0\u5ba2\u6237\u7aef\u7684\u4e09\u6b21\u63e1\u624b&#xff0c;\u82e5\u65e0\u65b0\u8fde\u63a5\u5219\u4e00\u76f4\u963b\u585e&#xff1b;<\/li>\n<li>recv()\/send()&#xff1a;\u963b\u585e\u7b49\u5f85\u5bf9\u5e94\u5ba2\u6237\u7aef\u7684\u8bfb\u5199\u6570\u636e&#xff0c;\u82e5\u65e0\u6570\u636e\u5219\u4e00\u76f4\u963b\u585e\u3002\u5355\u7ebf\u7a0b\u4e0b&#xff0c;\u963b\u585e IO \u4f1a\u5bfc\u81f4\u670d\u52a1\u5668\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef&#xff0c;\u65e0\u6cd5\u54cd\u5e94\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u8fde\u63a5 \/ \u6570\u636e\u8bf7\u6c42&#xff0c;\u7a0b\u5e8f\u903b\u8f91\u65e0\u6cd5\u6ee1\u8db3\u5e76\u53d1\u9700\u6c42\u3002<\/li>\n<\/ul>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a;<\/p>\n<ul>\n<li>TCP\u5e76\u53d1\u670d\u52a1\u5668\u7ebf\u7a0b\/\u8fdb\u7a0b\u6a21\u578b&#xff1a;\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5b9e\u73b0\u7b80\u5355&#xff08;\u6bcf\u4e2a\u65b0\u8fde\u63a5\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b \/ \u8fdb\u7a0b\u5904\u7406&#xff09;&#xff0c;\u903b\u8f91\u76f4\u89c2&#xff1b;<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u8d44\u6e90\u6d88\u8017\u5927&#xff0c;\u8fde\u63a5\u6570\u8fc7\u591a\u65f6\u4f1a\u8017\u5c3d\u7cfb\u7edf\u8d44\u6e90&#xff0c;\u4e14\u7ebf\u7a0b \/ \u8fdb\u7a0b\u5207\u6362\u5f00\u9500\u5927&#xff1b;<\/li>\n<\/ul>\n<\/li>\n<li>TCP\u5e76\u53d1\u670d\u52a1\u5668\u591a\u8def\u590d\u7528\u6a21\u578b&#xff08;select\/poll\/epoll&#xff09;\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5355\u7ebf\u7a0b \/ \u5c11\u91cf\u7ebf\u7a0b\u5373\u53ef\u5904\u7406\u5927\u91cf\u8fde\u63a5&#xff0c;\u8d44\u6e90\u6d88\u8017\u4f4e&#xff0c;\u5207\u6362\u5f00\u9500\u5c0f&#xff1b;<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u7f16\u7a0b\u903b\u8f91\u7a0d\u590d\u6742&#xff0c;select\/poll \u5b58\u5728\u6027\u80fd\u74f6\u9888&#xff08;epoll \u65e0\u6b64\u95ee\u9898&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1.2 Linux\u7cfb\u7edf\u76844\u79cdIO\u6a21\u578b<\/h3>\n<p>\u963b\u585eIO&#xff1a;<br \/>\n\u6570\u636e\u6ca1\u6765\u65f6&#xff0c;\u8fdb\u7a0b\/\u7ebf\u7a0b\u963b\u585e\u7b49\u5f85&#xff0c;\u4e0d\u5360\u7528CPU\u8d44\u6e90<\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;CPU\u5229\u7528\u7387\u9ad8&#xff0c;\u7f16\u7a0b\u7b80\u5355<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u4e00\u4e2a\u7ebf\u7a0b\u53ea\u80fd\u5904\u7406\u4e00\u4e2afd<\/li>\n<\/ul>\n<p>\u975e\u963b\u585eIO&#xff1a;<br \/>\n\u7cfb\u7edf\u8c03\u7528\u7acb\u5373\u8fd4\u56de&#xff0c;\u7528\u6237\u7a0b\u5e8f\u9700\u8981\u4e0d\u65ad\u8f6e\u8be2\u68c0\u67e5\u6570\u636e<\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u7ba1\u7406\u591a\u4e2afd<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u5927\u91cf\u5360\u7528CPU\u8d44\u6e90&#xff08;\u7a7a\u8f6e\u8be2&#xff09;<\/li>\n<\/ul>\n<p>\u591a\u8def\u590d\u7528IO&#xff1a;<br \/>\n\u7528\u4e00\u4e2a\u51fd\u6570&#xff08;select\/poll\/epoll&#xff09;\u76d1\u542c\u591a\u4e2afd\u662f\u5426\u4ea7\u751fIO\u4e8b\u4ef6&#xff0c;<br \/>\n\u53ea\u8981\u6709fd\u5c31\u7eea\u5c31\u8fd4\u56de&#xff0c;\u7528\u6237\u518d\u5904\u7406\u5bf9\u5e94fd<\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u7ba1\u7406\u5927\u91cf\u8fde\u63a5&#xff0c;CPU\u5229\u7528\u7387\u9ad8<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u7f16\u7a0b\u903b\u8f91\u590d\u6742<\/li>\n<\/ul>\n<p>\u4fe1\u53f7\u9a71\u52a8IO&#xff1a;<br \/>\n\u5f53fd\u6570\u636e\u5c31\u7eea\u65f6&#xff0c;\u5185\u6838\u4e3b\u52a8\u53d1SIGIO\u4fe1\u53f7\u901a\u77e5\u5e94\u7528&#xff0c;<br \/>\n\u5e94\u7528\u5728\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u4e2d\u8bfb\u53d6\u6570\u636e<\/p>\n<p>\u5f02\u6b65IO&#xff1a;<br \/>\n\u5e94\u7528\u53d1\u8d77\u8c03\u7528IO\u63a5\u53e3\u64cd\u4f5c\u540e\u7acb\u5373\u8fd4\u56de&#xff0c;\u5185\u6838\u5b8c\u6210\u5168\u90e8IO\u64cd\u4f5c<br \/>\n&#xff08;\u5305\u62ec\u6570\u636e\u62f7\u8d1d\u5230\u7528\u6237\u7f13\u51b2\u533a&#xff09;\u540e\u624d\u901a\u77e5\u5e94\u7528<\/p>\n<table>\n<tr>IO\u6a21\u578b\u7279\u70b9CPU\u5360\u7528\u5e76\u53d1\u80fd\u529b\u7f16\u7a0b\u590d\u6742\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u963b\u585eIO<\/td>\n<td>\u6570\u636e\u672a\u5230\u963b\u585e<\/td>\n<td>\u4f4e<\/td>\n<td>\u5dee<\/td>\n<td>\u7b80\u5355<\/td>\n<\/tr>\n<tr>\n<td>\u975e\u963b\u585eIO<\/td>\n<td>\u8f6e\u8be2\u68c0\u67e5<\/td>\n<td>\u9ad8<\/td>\n<td>\u4e2d<\/td>\n<td>\u4e2d\u7b49<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u8def\u590d\u7528<\/td>\n<td>\u7edf\u4e00\u76d1\u542c<\/td>\n<td>\u4f4e<\/td>\n<td>\u9ad8<\/td>\n<td>\u590d\u6742<\/td>\n<\/tr>\n<tr>\n<td>\u4fe1\u53f7\u9a71\u52a8<\/td>\n<td>\u4fe1\u53f7\u901a\u77e5\u5c31\u7eea<\/td>\n<td>\u4f4e<\/td>\n<td>\u9ad8<\/td>\n<td>\u8f83\u590d\u6742<\/td>\n<\/tr>\n<tr>\n<td>\u5f02\u6b65IO<\/td>\n<td>\u5185\u6838\u5b8c\u6210\u6240\u6709<\/td>\n<td>\u4f4e<\/td>\n<td>\u9ad8<\/td>\n<td>\u6700\u590d\u6742<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u4fe1\u53f7\u9a71\u52a8 I\/O&#xff1a;\u5185\u6838\u53ea\u8d1f\u8d23\u201c\u901a\u77e5\u4f60\u53ef\u4ee5\u505a\u4e86\u201d<\/li>\n<li>\u5f02\u6b65 I\/O&#xff1a;\u5185\u6838\u76f4\u63a5\u628a I\/O \u64cd\u4f5c\u505a\u5b8c&#xff0c;\u5b8c\u6210\u540e\u518d\u901a\u77e5\u4f60<\/li>\n<\/ul>\n<h3>1.3 \u51fd\u6570\u63a5\u53e3<\/h3>\n<h4>1.3.1 fcntl&#xff08;\u8bbe\u7f6e\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c5e\u6027&#xff09;&#xff08;\u6587\u4ef6\u63cf\u8ff0\u7b26\u63a7\u5236&#xff09;<\/h4>\n<ul>\n<li>\u51fd\u6570\u539f\u578b&#xff1a;<\/li>\n<\/ul>\n<p>int fcntl(int fd, int cmd, &#8230; \/* arg *\/ );<\/p>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u5bf9\u5df2\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u6267\u884c\u6307\u5b9a\u7684\u63a7\u5236\u64cd\u4f5c&#xff08;\u5982\u4fee\u6539\u5c5e\u6027\u3001\u8bbe\u7f6e\u6240\u6709\u6743\u3001\u83b7\u53d6\u72b6\u6001\u7b49&#xff09;<\/li>\n<li>\u53c2\u6570&#xff1a;\n<ul>\n<li>fd&#xff1a;\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u00a0<\/li>\n<li>cmd&#xff1a;\u64cd\u4f5c\u547d\u4ee4&#xff08;\u6838\u5fc3\u5e38\u7528\u503c\u5982\u4e0b&#xff09;\n<ul>\n<li>\u00a0F_GETFL&#xff1a;\u83b7\u53d6\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u6807\u5fd7&#xff08;\u5982 O_NONBLOCK\u3001O_ASYNC&#xff09;<\/li>\n<li>\u00a0F_SETFL&#xff1a;\u8bbe\u7f6e\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u6807\u5fd7&#xff08;\u4ec5\u80fd\u4fee\u6539 O_APPEND\u3001O_NONBLOCK\u3001O_ASYNC \u7b49&#xff09;<\/li>\n<li>F_SETOWN&#xff1a;\u8bbe\u7f6e\u63a5\u6536 SIGIO\/SIGURG \u4fe1\u53f7\u7684\u8fdb\u7a0b ID \/ \u8fdb\u7a0b\u7ec4 ID<\/li>\n<li>\u00a0F_GETOWN&#xff1a;\u83b7\u53d6\u63a5\u6536 SIGIO\/SIGURG \u4fe1\u53f7\u7684\u8fdb\u7a0b ID \/ \u8fdb\u7a0b\u7ec4 ID<\/li>\n<\/ul>\n<\/li>\n<li>\u00a0arg&#xff1a;\u53ef\u9009\u53c2\u6570&#xff0c;\u6839\u636e cmd \u51b3\u5b9a&#xff08;\u5982 F_SETFL \u65f6\u4f20\u65b0\u7684\u6807\u5fd7\u4f4d&#xff0c;F_SETOWN \u65f6\u4f20\u8fdb\u7a0b ID&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li>\u6267\u884c F_GETFL&#xff1a;\u6210\u529f\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u6807\u5fd7\u503c&#xff08;\u6574\u6570&#xff09;&#xff0c;\u5931\u8d25\u8fd4\u56de &#8211; 1 \u00a0<\/li>\n<li>\u6267\u884c F_SETFL\/F_SETOWN&#xff1a;\u6210\u529f\u8fd4\u56de 0&#xff0c;\u5931\u8d25\u8fd4\u56de &#8211; 1<\/li>\n<li>\u5176\u4ed6 cmd&#xff08;\u5982 F_DUPFD&#xff09;&#xff1a;\u6210\u529f\u8fd4\u56de\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5931\u8d25\u8fd4\u56de &#8211; 1<\/li>\n<li>\u00a0\u901a\u7528\u89c4\u5219&#xff1a;\u5931\u8d25\u65f6\u5747\u4f1a\u8bbe\u7f6eerrno<\/li>\n<\/ul>\n<\/li>\n<li>eg:<\/li>\n<\/ul>\n<p>\/\/ \u67d0\u4e9b\u7cfb\u7edf\u9700\u8981\u5b9a\u4e49 _GNU_SOURCE \u624d\u80fd\u770b\u5230 F_SETOWN<br \/>\n#define _GNU_SOURCE<br \/>\n#include &lt;fcntl.h&gt;<\/p>\n<p>#include &lt;unistd.h&gt;<br \/>\n#include &lt;signal.h&gt;<br \/>\n#include &lt;stdio.h&gt;<\/p>\n<p>\/\/ \u793a\u4f8b&#xff1a;\u5c06fd\u8bbe\u7f6e\u4e3a\u4fe1\u53f7\u9a71\u52a8IO<br \/>\nvoid sigio_handler(int signo) {<br \/>\n    printf(&#034;\u6536\u5230IO\u4e8b\u4ef6\u901a\u77e5\\\\n&#034;);<br \/>\n}<\/p>\n<p>void set_async_io(int fd) {<br \/>\n    int flags;<br \/>\n    \/\/ 1. \u83b7\u53d6\u5f53\u524dfd\u7684\u5c5e\u6027<br \/>\n    flags &#061; fcntl(fd, F_GETFL);<br \/>\n    if (flags &#061;&#061; -1) {<br \/>\n        perror(&#034;fcntl F_GETFL error&#034;);<br \/>\n        return;<br \/>\n    }<br \/>\n    \/\/ 2. \u8bbe\u7f6e\u5f02\u6b65IO\u5c5e\u6027&#xff08;O_ASYNC&#xff09;<br \/>\n    flags |&#061; O_ASYNC;<br \/>\n    if (fcntl(fd, F_SETFL, flags) &#061;&#061; -1) {<br \/>\n        perror(&#034;fcntl F_SETFL error&#034;);<br \/>\n        return;<br \/>\n    }<br \/>\n    \/\/ 3. \u8bbe\u7f6e\u5f53\u524d\u8fdb\u7a0b\u63a5\u6536\u8be5fd\u7684SIGIO\u4fe1\u53f7<br \/>\n    if (fcntl(fd, F_SETOWN, getpid()) &#061;&#061; -1) {<br \/>\n        perror(&#034;fcntl F_SETOWN error&#034;);<br \/>\n        return;<br \/>\n    }<br \/>\n}<\/p>\n<p>\/\/ F_SETOWN \u7684\u4f5c\u7528&#xff1a;\u8bbe\u7f6e\u54ea\u4e2a\u8fdb\u7a0b(\u6216\u8fdb\u7a0b\u7ec4)\u63a5\u6536\u8be5fd\u7684SIGIO\u4fe1\u53f7<br \/>\nfcntl(fd, F_SETOWN, getpid());  \/\/ \u8bbe\u7f6e\u5f53\u524d\u8fdb\u7a0b\u63a5\u6536\u4fe1\u53f7<\/p>\n<p>\u5173\u952e\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>O_ASYNC\u4ec5\u5bf9 \u201c\u652f\u6301\u5f02\u6b65\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u201d \u6709\u6548&#xff08;\u5982\u5957\u63a5\u5b57\u3001\u7ec8\u7aef&#xff09;&#xff0c;\u666e\u901a\u6587\u4ef6\u4e0d\u652f\u6301&#xff1b;<\/li>\n<li>\u5f02\u6b65 IO \u7684\u6838\u5fc3\u662f \u201c\u5185\u6838\u4e3b\u52a8\u901a\u77e5\u201d&#xff0c;\u4f46O_ASYNC\u5b9e\u73b0\u7684\u662f\u4fe1\u53f7\u9a71\u52a8 IO&#xff08;\u975e\u771f\u6b63\u7684\u5f02\u6b65 IO&#xff09;\u3002<\/li>\n<\/ul>\n<p>\/\/\u5e38\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p>\/\/ 1. \u83b7\u53d6 fd \u7684\u72b6\u6001\u6807\u5fd7<br \/>\nint flags &#061; fcntl(fd, F_GETFL);<br \/>\nif (flags &#061;&#061; -1) {<br \/>\n    perror(&#034;fcntl F_GETFL&#034;);<br \/>\n    return -1;<br \/>\n}<\/p>\n<p>\/\/ 2. \u8bbe\u7f6e fd \u4e3a\u975e\u963b\u585eIO<br \/>\nflags |&#061; O_NONBLOCK;<br \/>\nif (fcntl (fd, F_SETFL, flags) &#061;&#061; -1) {<br \/>\n    perror (&#034;fcntl F_SETFL&#034;);<br \/>\n    return -1;<br \/>\n}<\/p>\n<p>\/\/ 3. \u8bbe\u7f6e fd \u7684 SIGIO \u4fe1\u53f7\u5f52\u5c5e\u5f53\u524d\u8fdb\u7a0b<br \/>\nif (fcntl (fd, F_SETOWN, getpid ()) &#061;&#061; -1) {<br \/>\n    perror (&#034;fcntl F_SETOWN&#034;);<br \/>\n    return -1;<br \/>\n}<\/p>\n<p>| \u6ce8\u610f\u4e8b\u9879 |<br \/>\n1. &#096;F_SETFL&#096;\u4ec5\u80fd\u4fee\u6539**\u53ef\u4fee\u6539\u7684\u6807\u5fd7\u4f4d**<br \/>\n&#xff08;\u5982O_NONBLOCK\u3001O_ASYNC&#xff09;&#xff0c;\u65e0\u6cd5\u4fee\u6539O_RDONLY\u3001O_WRONLY\u7b49\u6253\u5f00\u65f6\u7684\u57fa\u7840\u6807\u5fd7&#xff1b;<br \/>\n2. &#096;O_ASYNC&#096;&#xff08;\u5f02\u6b65IO\u6807\u5fd7&#xff09;\u4ec5\u5bf9\u5957\u63a5\u5b57\u3001\u7ec8\u7aef\u7b49\u201c\u9762\u5411\u5b57\u7b26\u201d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6709\u6548&#xff0c;\u666e\u901a\u6587\u4ef6\u4e0d\u652f\u6301\u3002<\/p>\n<h4>1.3.2 select \u51fd\u6570&#xff08;\u591a\u8def\u590d\u7528IO&#xff09;<\/h4>\n<ul>\n<li>\u51fd\u6570\u539f\u578b&#xff1a;<\/li>\n<\/ul>\n<p>int select(int nfds, fd_set *readfds, fd_set *writefds,<br \/>\n            fd_set *exceptfds, struct timeval *timeout);<\/p>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u76d1\u542c\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u3001\u5199\u3001\u5f02\u5e38\u4e8b\u4ef6&#xff0c;\u76f4\u5230\u6709\u4e8b\u4ef6\u53d1\u751f\u6216\u8d85\u65f6<\/li>\n<li>\u53c2\u6570&#xff1a;\n<ul>\n<li>nfds&#xff1a;\u9700\u8981\u76d1\u542c\u7684\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26 &#043; 1&#xff08;select \u4f1a\u4ece 0 \u904d\u5386\u5230 nfds-1&#xff0c;\u56e0\u6b64\u5fc5\u987b\u4f20\u6700\u5927\u503c &#043; 1&#xff09;<\/li>\n<li>readfds&#xff1a;\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u4e8b\u4ef6&#xff09;\u96c6\u5408&#xff08;\u76d1\u542c\u662f\u5426\u6709\u6570\u636e\u53ef\u8bfb&#xff0c;\u5982 recv\u3001accept&#xff09;&#xff0c;\u4f20 NULL \u8868\u793a\u4e0d\u76d1\u542c<\/li>\n<li>writefds&#xff1a;\u5199\u4e8b\u4ef6\u96c6\u5408&#xff08;\u76d1\u542c\u662f\u5426\u53ef\u5199&#xff0c;\u5982 send&#xff09;&#xff0c;\u4f20 NULL \u8868\u793a\u4e0d\u76d1\u542c<\/li>\n<li>exceptfds&#xff1a;\u5f02\u5e38\u4e8b\u4ef6\u96c6\u5408&#xff08;\u5982\u5957\u63a5\u5b57\u5e26\u5916\u6570\u636e&#xff1a;\u53ef\u4ee5\u7406\u89e3\u4e3a&#034;\u7d27\u6025\u6570\u636e&#034;\u6216&#034;\u52a0\u6025\u6570\u636e&#034;&#xff0c;\u5b83\u5728\u6b63\u5e38\u6570\u636e\u6d41\u4e4b\u5916\u4f20\u8f93&#xff0c;\u5373\u4f7f\u63a5\u6536\u7f13\u51b2\u533a\u6ee1\u4e86\u4e5f\u80fd\u88ab\u7acb\u5373\u5904\u7406\u3002&#xff09;&#xff0c;\u4f20 NULL \u8868\u793a\u4e0d\u76d1\u542c<\/li>\n<li>timeout&#xff1a;\u8d85\u65f6\u65f6\u95f4&#xff0c;\u7ed3\u6784\u4f53\u5b9a\u4e49\u5982\u4e0b&#xff1a;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>struct timeval {<br \/>\n    long tv_sec; \/\/ \u79d2<br \/>\n    long tv_usec; \/\/ \u5fae\u79d2<br \/>\n};<\/p>\n<ul>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li>\u6210\u529f&#xff1a;\u8fd4\u56de\u5c31\u7eea&#xff08;\u4ea7\u751f\u4e8b\u4ef6&#xff09;\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u603b\u6570&#xff08;\u8bfb&#043;\u5199&#043;\u5f02\u5e38&#xff09;\u00a0<\/li>\n<li>\u5931\u8d25&#xff1a;\u8fd4\u56de-1&#xff0c;\u8bbe\u7f6eerrno&#xff08;\u5982\u88ab\u4fe1\u53f7\u4e2d\u65ad\u65f6errno&#061;EINTR&#xff09;<\/li>\n<li>\u8d85\u65f6&#xff1a;\u8fd4\u56de0&#xff08;\u65e0\u4efb\u4f55\u4e8b\u4ef6\u5c31\u7eea<\/li>\n<\/ul>\n<\/li>\n<li>\u6ce8\u610f\u4e8b\u9879 &#xff1a;\n<ul>\n<li>select\u8fd4\u56de\u540e&#xff0c;\u672a\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f1a\u88ab\u4ece\u96c6\u5408\u4e2d\u6e05\u9664&#xff0c;\u56e0\u6b64\u6bcf\u6b21\u8c03\u7528\u524d\u9700\u91cd\u65b0\u521d\u59cb\u5316\u96c6\u5408&#xff1b;<\/li>\n<li>2. \u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u53d7\u9650\u4e8eFD_SETSIZE&#xff08;\u9ed8\u8ba41024&#xff09;&#xff0c;\u65e0\u6cd5\u7a81\u7834&#xff1b;<\/li>\n<li>\u9700\u904d\u5386\u6240\u6709\u76d1\u542c\u7684fd\u624d\u80fd\u627e\u5230\u5c31\u7eea\u7684fd&#xff0c;\u8fde\u63a5\u6570\u8d8a\u591a\u6548\u7387\u8d8a\u4f4e\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>1.3.3 fd_set\u76f8\u5173\u8f85\u52a9\u5b8f&#xff08;\u64cd\u4f5c\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff09;<\/h4>\n<p>void FD_CLR(int fd, fd_set *set);<\/p>\n<p>\u529f\u80fd&#xff1a;\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u4ece\u96c6\u5408set\u4e2d\u79fb\u9664<\/p>\n<p>\u6ce8\u610f&#xff1a;fd\u9700\u662f\u6709\u6548\u7684\u3001\u5df2\u52a0\u5165\u96c6\u5408\u7684\u63cf\u8ff0\u7b26<\/p>\n<p>int FD_ISSET(int fd, fd_set *set);<\/p>\n<p>\u529f\u80fd&#xff1a;\u5224\u65adfd\u662f\u5426\u5728\u5c31\u7eea\u7684\u96c6\u5408set\u4e2d<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a;\u5728\u96c6\u5408\u4e2d\u8fd4\u56de\u975e0\u503c&#xff0c;\u4e0d\u5728\u8fd4\u56de0<\/p>\n<p>\u6838\u5fc3\u7528\u9014&#xff1a;select\u8fd4\u56de\u540e&#xff0c;\u904d\u5386\u5224\u65ad\u54ea\u4e2afd\u5c31\u7eea<\/p>\n<p>void FD_SET(int fd, fd_set *set);<\/p>\n<p>\u529f\u80fd&#xff1a;\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u52a0\u5165\u96c6\u5408set<\/p>\n<p>\u6ce8\u610f&#xff1a;fd\u4e0d\u80fd\u8d85\u8fc7FD_SETSIZE-1&#xff0c;\u5426\u5219\u884c\u4e3a\u672a\u5b9a\u4e49<\/p>\n<p>void FD_ZERO(fd_set *set);<\/p>\n<p>\u529f\u80fd&#xff1a;\u5c06\u96c6\u5408set\u7684\u6240\u6709\u4f4d\u6e050&#xff08;\u521d\u59cb\u5316\u96c6\u5408&#xff09;&#xff1b;\u5fc5\u987b\u5728\u4f7f\u7528\u96c6\u5408\u524d\u8c03\u7528&#xff0c;\u5426\u5219\u96c6\u5408\u5185\u6570\u636e\u968f\u673a<\/p>\n<p>\/\/\u5e38\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p>fd_set read_fds;<\/p>\n<p>\/\/ 1. \u521d\u59cb\u5316\u96c6\u5408<br \/>\nFD_ZERO(&amp;read_fds);<\/p>\n<p>\/\/ 2. \u5c06\u76d1\u542cfd\u52a0\u5165\u96c6\u5408<br \/>\nFD_SET(listen_fd, &amp;read_fds);<\/p>\n<p>\/\/ 3. \u8c03\u7528select<br \/>\nselect(listen_fd&#043;1, &amp;read_fds, NULL, NULL, NULL);<\/p>\n<p>\/\/ 4. \u5224\u65adfd\u662f\u5426\u5c31\u7eea<br \/>\nif (FD_ISSET(listen_fd, &amp;read_fds)) {<br \/>\n  \/\/ \u76d1\u542cfd\u6709\u4e8b\u4ef6&#xff08;\u65b0\u8fde\u63a5&#xff09;<br \/>\n}<\/p>\n<p>\/\/ 5. \u79fb\u9664fd<br \/>\nFD_CLR(listen_fd, &amp;read_fds);<\/p>\n<table>\n<tr>\u96c6\u5408\u72b6\u6001timeout&#061;NULLtimeout&#061;0timeout&gt;0<\/tr>\n<tbody>\n<tr>\n<td>\u7a7a\u96c6\u5408<\/td>\n<td>\u8fdb\u7a0b\u4f1a\u4e00\u76f4\u963b\u585e&#xff0c;\u76f4\u5230\u624b\u52a8\u53d1\u9001\u4fe1\u53f7&#xff08;\u5982 Ctrl&#043;C&#xff09;\u4e2d\u65ad&#xff0c;\u5426\u5219\u4e0d\u4f1a\u8fd4\u56de\u3002<\/td>\n<td>\u7acb\u5373\u8fd4\u56de0<\/td>\n<td>\u7b49\u5f85\u8d85\u65f6\u540e\u8fd4\u56de0<\/td>\n<\/tr>\n<tr>\n<td>\u6709fd\u4f46\u65e0\u4e8b\u4ef6<\/td>\n<td>\u963b\u585e\u76f4\u5230\u6709\u4e8b\u4ef6\u5c31\u7eea\/\u88ab\u4fe1\u53f7\u4e2d\u65ad<\/td>\n<td>\u7acb\u5373\u8fd4\u56de0<\/td>\n<td>\u7b49\u5f85\u81f3\u8d85\u65f6&#xff08;\u8fd4\u56de 0&#xff09;\u6216\u6709 fd \u5c31\u7eea&#xff08;\u8fd4\u56de\u5c31\u7eea\u6570&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001TCP\u5e76\u53d1\u670d\u52a1\u5668&#xff11;.&#xff11;TCP\u5e76\u53d1\u670d\u52a1\u5668\u95ee\u9898\u670d\u52a1\u7aef\u9700\u8981\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6&#xff0c;\u6838\u5fc3\u77db\u76fe&#xff1a;accept()&#xff1a;\u963b\u585e\u7b49\u5f85\u65b0\u5ba2\u6237\u7aef\u7684\u4e09\u6b21\u63e1\u624b&#xff0c;\u82e5\u65e0\u65b0\u8fde\u63a5\u5219\u4e00\u76f4\u963b\u585e&#xff1b;recv()\/send()&#xff1a;\u963b\u585e\u7b49\u5f85\u5bf9\u5e94\u5ba2\u6237\u7aef\u7684\u8bfb\u5199\u6570\u636e&#xff0c;\u82e5\u65e0\u6570\u636e\u5219\u4e00\u76f4\u963b\u585e\u3002\u5355\u7ebf\u7a0b\u4e0b&#xff0c;\u963b\u585e IO \u4f1a\u5bfc\u81f4\u670d\u52a1\u5668\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef&#xff0c;\u65e0\u6cd5\u54cd\u5e94\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u8fde\u63a5 \/ \u6570\u636e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8195,9511,9512,43,78],"topic":[],"class_list":["post-85031","post","type-post","status-publish","format-standard","hentry","category-server","tag-io","tag-tcp","tag-43","tag-78"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u7f51\u7edc\u901a\u4fe1 - TCP\u5e76\u53d1\u670d\u52a1\u5668\/IO\u6a21\u578b\/\u591a\u8def\u590d\u7528IO\u76f8\u5173\u51fd\u6570\u63a5\u53e3 - Linux - \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\/85031.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7f51\u7edc\u901a\u4fe1 - TCP\u5e76\u53d1\u670d\u52a1\u5668\/IO\u6a21\u578b\/\u591a\u8def\u590d\u7528IO\u76f8\u5173\u51fd\u6570\u63a5\u53e3 - Linux - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"1\u3001TCP\u5e76\u53d1\u670d\u52a1\u5668&#xff11;.&#xff11;TCP\u5e76\u53d1\u670d\u52a1\u5668\u95ee\u9898\u670d\u52a1\u7aef\u9700\u8981\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6&#xff0c;\u6838\u5fc3\u77db\u76fe&#xff1a;accept()&#xff1a;\u963b\u585e\u7b49\u5f85\u65b0\u5ba2\u6237\u7aef\u7684\u4e09\u6b21\u63e1\u624b&#xff0c;\u82e5\u65e0\u65b0\u8fde\u63a5\u5219\u4e00\u76f4\u963b\u585e&#xff1b;recv()\/send()&#xff1a;\u963b\u585e\u7b49\u5f85\u5bf9\u5e94\u5ba2\u6237\u7aef\u7684\u8bfb\u5199\u6570\u636e&#xff0c;\u82e5\u65e0\u6570\u636e\u5219\u4e00\u76f4\u963b\u585e\u3002\u5355\u7ebf\u7a0b\u4e0b&#xff0c;\u963b\u585e IO \u4f1a\u5bfc\u81f4\u670d\u52a1\u5668\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef&#xff0c;\u65e0\u6cd5\u54cd\u5e94\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u8fde\u63a5 \/ \u6570\u636e\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/85031.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-26T14:18:45+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/85031.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/85031.html\",\"name\":\"\u7f51\u7edc\u901a\u4fe1 - TCP\u5e76\u53d1\u670d\u52a1\u5668\/IO\u6a21\u578b\/\u591a\u8def\u590d\u7528IO\u76f8\u5173\u51fd\u6570\u63a5\u53e3 - Linux - 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