{"id":208395,"date":"2025-09-04T09:45:57","date_gmt":"2025-09-04T01:45:57","guid":{"rendered":"https:\/\/www.server.hk\/blog\/?p=208395"},"modified":"2025-09-04T09:45:57","modified_gmt":"2025-09-04T01:45:57","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90-linux-%e5%86%85%e6%a0%b8%e7%bd%91%e7%bb%9c%e5%8d%8f%e8%ae%ae%e6%a0%88%e4%b8%ad%e7%9a%84-accept-%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208395\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Linux \u5185\u6838\u7f51\u7edc\u534f\u8bae\u6808\u4e2d\u7684 accept \u51fd\u6570"},"content":{"rendered":"<h2 dir=\"auto\">\u5f15\u8a00\uff1a\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684 accept \u51fd\u6570<\/h2>\n<p dir=\"auto\">accept \u51fd\u6570\u662f\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684\u6838\u5fc3\u7ec4\u4ef6\uff0c\u7528\u4e8e\u5728 TCP \u534f\u8bae\u4e2d\u5b9e\u73b0\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u5efa\u7acb\u3002\u5b83\u662f Linux \u5185\u6838\u7f51\u7edc\u534f\u8bae\u6808\u7684\u91cd\u8981\u90e8\u5206\uff0c\u4e3a\u53ef\u9760\u7684\u6570\u636e\u901a\u4fe1\u63d0\u4f9b\u4e86\u652f\u6301\u3002\u672c\u6587\u5c06\u6df1\u5165\u5256\u6790 accept \u51fd\u6570\u5728\u5185\u6838\u5404\u5c42\u4e2d\u7684\u5b9e\u73b0\uff0c\u5305\u62ec\u5e94\u7528\u5c42\u3001BSD \u5957\u63a5\u5b57\u5c42\u3001INET \u5957\u63a5\u5b57\u5c42\u548c\u4f20\u8f93\u5c42\uff0c\u65e8\u5728\u4e3a\u5f00\u53d1\u8005\u548c\u7cfb\u7edf\u5de5\u7a0b\u5e08\u63d0\u4f9b\u8be6\u5c3d\u7684\u6280\u672f\u6307\u5bfc\u3002<\/p>\n<h3 dir=\"auto\">\u4e3b\u8981\u76ee\u6807<\/h3>\n<ul dir=\"auto\">\n<li>\u9610\u660e accept \u51fd\u6570\u5728 TCP \u8fde\u63a5\u5efa\u7acb\u4e2d\u7684\u4f5c\u7528\u3002<\/li>\n<li>\u8be6\u7ec6\u89e3\u6790\u5176\u5728\u4e0d\u540c\u5185\u6838\u5c42\u4e2d\u7684\u5b9e\u73b0\u673a\u5236\u3002<\/li>\n<li>\u89e3\u91ca\u76d1\u542c\u5957\u63a5\u5b57\u4e0e\u901a\u4fe1\u5957\u63a5\u5b57\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/li>\n<li>\u4f18\u5316\u6587\u7ae0\u5185\u5bb9\u4ee5\u63d0\u5347\u641c\u7d22\u5f15\u64ce\u53ef\u89c1\u6027\uff0c\u878d\u5165\u5173\u952e\u8bcd\u5982\u201cLinux \u5185\u6838 accept \u51fd\u6570\u201d\u3001\u201cTCP \u8fde\u63a5\u5efa\u7acb\u201d\u548c\u201c\u5957\u63a5\u5b57\u7f16\u7a0b\u201d\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u5e94\u7528\u5c42\uff1aaccept \u7cfb\u7edf\u8c03\u7528<\/h2>\n<p dir=\"auto\">accept \u7cfb\u7edf\u8c03\u7528\u662f\u7528\u6237\u7a7a\u95f4\u5e94\u7528\u7a0b\u5e8f\u5efa\u7acb TCP \u8fde\u63a5\u7684\u5165\u53e3\u3002\u5b83\u4ece\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8fde\u63a5\u961f\u5217\u4e2d\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7528\u4e8e\u4e0e\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u65b0\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u3002<\/p>\n<h3 dir=\"auto\">\u51fd\u6570\u7b7e\u540d<\/h3>\n<div dir=\"auto\">\n<div data-testid=\"code-block\">\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>#include &lt;sys\/socket.h&gt;<\/div>\n<div>int accept(int sockfd, struct sockaddr *cliaddr, socklen_t *addrlen);<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<ul dir=\"auto\">\n<li><strong>\u53c2\u6570\u8bf4\u660e<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>sockfd\uff1a\u76d1\u542c\u5957\u63a5\u5b57\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u901a\u8fc7 socket() \u521b\u5efa\u5e76\u901a\u8fc7 bind() \u7ed1\u5b9a\u5230\u7aef\u53e3\u3002<\/li>\n<li>cliaddr\uff1a\u6307\u5411 sockaddr \u7ed3\u6784\u7684\u6307\u9488\uff0c\u7528\u4e8e\u5b58\u50a8\u8fde\u63a5\u6210\u529f\u540e\u5ba2\u6237\u7aef\u7684\u534f\u8bae\u5730\u5740\u3002<\/li>\n<li>addrlen\uff1a\u6307\u5411 socklen_t \u53d8\u91cf\u7684\u6307\u9488\uff0c\u6307\u5b9a cliaddr \u7ed3\u6784\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8fd4\u56de\u503c<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u6210\u529f\u65f6\u8fd4\u56de\u4e00\u4e2a\u975e\u8d1f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u8868\u793a\u65b0\u7684\u901a\u4fe1\u5957\u63a5\u5b57\u3002<\/li>\n<li>\u51fa\u9519\u65f6\u8fd4\u56de -1\uff0c\u5e76\u8bbe\u7f6e errno \u4ee5\u6307\u793a\u5177\u4f53\u9519\u8bef\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u6838\u5fc3\u529f\u80fd<\/h3>\n<ul dir=\"auto\">\n<li>\u76d1\u63a7\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n<li>\u63a5\u6536\u5230\u8bf7\u6c42\u540e\uff0c\u521b\u5efa\u65b0\u7684\u901a\u4fe1\u5957\u63a5\u5b57\uff0c\u5e76\u53ef\u8fd4\u56de\u5ba2\u6237\u7aef\u7684\u5730\u5740\u4fe1\u606f\u3002<\/li>\n<li>\u5982\u679c\u4e0d\u9700\u8981\u5ba2\u6237\u7aef\u5730\u5740\uff0c\u53ef\u5c06 cliaddr \u548c addrlen \u8bbe\u7f6e\u4e3a NULL\u3002<\/li>\n<\/ul>\n<p dir=\"auto\">\u901a\u5e38\uff0caccept \u51fd\u6570\u5728\u8c03\u7528 listen() \u5c06\u5957\u63a5\u5b57\u8bbe\u7f6e\u4e3a\u76d1\u542c\u6a21\u5f0f\u540e\u4f7f\u7528\uff0c\u4ee5\u51c6\u5907\u63a5\u53d7\u8fde\u63a5\u8bf7\u6c42\u3002<\/p>\n<h2 dir=\"auto\">BSD \u5957\u63a5\u5b57\u5c42\uff1asock_accept \u51fd\u6570<\/h2>\n<p dir=\"auto\">\u5728 BSD \u5957\u63a5\u5b57\u5c42\uff0csock_accept \u51fd\u6570\u8d1f\u8d23\u521b\u5efa\u65b0\u7684\u5957\u63a5\u5b57\u4ee5\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5\uff0c\u786e\u4fdd\u76d1\u542c\u5957\u63a5\u5b57\u7684\u72b6\u6001\u6b63\u786e\u5e76\u4e3a\u65b0\u8fde\u63a5\u5206\u914d\u8d44\u6e90\u3002<\/p>\n<h3 dir=\"auto\">\u4e3b\u8981\u64cd\u4f5c<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u5957\u63a5\u5b57\u9a8c\u8bc1<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26 (fd) \u662f\u5426\u6709\u6548\u4e14\u5bf9\u5e94\u4e00\u4e2a\u5957\u63a5\u5b57\u3002<\/li>\n<li>\u786e\u8ba4\u5957\u63a5\u5b57\u5904\u4e8e SS_UNCONNECTED \u72b6\u6001\u5e76\u8bbe\u7f6e\u4e86 SO_ACCEPTCON \u6807\u5fd7\uff0c\u8868\u793a\u5df2\u51c6\u5907\u597d\u63a5\u53d7\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u65b0\u5957\u63a5\u5b57\u5206\u914d<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u4f7f\u7528 sock_alloc() \u5206\u914d\u4e00\u4e2a\u65b0\u7684\u5957\u63a5\u5b57\u7ed3\u6784\u3002<\/li>\n<li>\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u7684\u5c5e\u6027\uff08\u5982\u7c7b\u578b\u548c\u64cd\u4f5c\u96c6\uff09\u590d\u5236\u5230\u65b0\u5957\u63a5\u5b57\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8fde\u63a5\u5efa\u7acb<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u8c03\u7528 inet_accept \u5904\u7406\u534f\u8bae\u7279\u5b9a\u7684\u8fde\u63a5\u903b\u8f91\u3002<\/li>\n<li>\u4f7f\u7528 get_fd() \u4e3a\u901a\u4fe1\u5957\u63a5\u5b57\u5206\u914d\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5ba2\u6237\u7aef\u5730\u5740\u5904\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u534f\u8bae\u5730\u5740\u5e76\u5728\u9700\u8981\u65f6\u590d\u5236\u5230\u7528\u6237\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u9519\u8bef\u5904\u7406<\/h3>\n<ul dir=\"auto\">\n<li>\u8fd4\u56de\u9519\u8bef\u5982 -EBADF\uff08\u65e0\u6548\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\u3001-ENOTSOCK\uff08\u975e\u5957\u63a5\u5b57\uff09\u6216 -EINVAL\uff08\u5957\u63a5\u5b57\u672a\u5904\u4e8e\u76d1\u542c\u72b6\u6001\uff09\u3002<\/li>\n<li>\u5982\u679c\u5957\u63a5\u5b57\u5206\u914d\u5931\u8d25\uff0c\u8fd4\u56de -ENOSR \u8868\u793a\u8d44\u6e90\u4e0d\u8db3\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">INET \u5957\u63a5\u5b57\u5c42\uff1ainet_accept \u51fd\u6570<\/h2>\n<p dir=\"auto\">inet_accept \u51fd\u6570\u4f4d\u4e8e INET \u5957\u63a5\u5b57\u5c42\uff0c\u8fde\u63a5 BSD \u5957\u63a5\u5b57\u5c42\u4e0e TCP \u534f\u8bae\u7684\u5e95\u5c42\u903b\u8f91\uff0c\u786e\u4fdd TCP \u8fde\u63a5\u8fc7\u7a0b\u7684\u6b63\u786e\u5904\u7406\u3002<\/p>\n<h3 dir=\"auto\">\u6838\u5fc3\u804c\u8d23<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u5957\u63a5\u5b57\u72b6\u6001\u7ba1\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u786e\u4fdd\u76d1\u542c\u5957\u63a5\u5b57\u6709\u6548\u4e14\u5177\u5907\u5173\u8054\u7684\u534f\u8bae\u64cd\u4f5c\u96c6\u3002<\/li>\n<li>\u5c06\u65b0\u5957\u63a5\u5b57\u72b6\u6001\u8bbe\u7f6e\u4e3a SS_CONNECTED \u8868\u793a\u8fde\u63a5\u5df2\u5efa\u7acb\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>TCP \u8fde\u63a5\u5904\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u8c03\u7528 tcp_accept \u51fd\u6570\u5904\u7406 TCP \u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n<li>\u5904\u7406\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u7684\u4e2d\u65ad\uff0c\u5b58\u50a8\u88ab\u4e2d\u65ad\u7684\u5957\u63a5\u5b57\u4ee5\u4fbf\u540e\u7eed\u4f18\u5148\u5904\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8d44\u6e90\u6e05\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u91ca\u653e\u65b0\u5957\u63a5\u5b57\u4e2d\u5df2\u5b58\u5728\u7684\u65e7\u6570\u636e\uff0c\u9632\u6b62\u8d44\u6e90\u6cc4\u6f0f\u3002<\/li>\n<li>\u5bf9\u5931\u8d25\u7684\u8fde\u63a5\u8fdb\u884c\u9500\u6bc1\u5e76\u66f4\u65b0\u9519\u8bef\u72b6\u6001\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u5173\u952e\u7279\u6027<\/h3>\n<ul dir=\"auto\">\n<li>\u652f\u6301\u975e\u963b\u585e\u64cd\u4f5c\uff0c\u901a\u8fc7 O_NONBLOCK \u6807\u5fd7\u5b9e\u73b0\u3002<\/li>\n<li>\u7ba1\u7406 TCP \u4e09\u6b21\u63e1\u624b\uff0c\u786e\u4fdd\u8fde\u63a5\u8fbe\u5230 TCP_ESTABLISHED \u72b6\u6001\u3002<\/li>\n<li>\u5904\u7406\u9519\u8bef\u5982 -EOPNOTSUPP\uff08\u4e0d\u652f\u6301\u7684\u64cd\u4f5c\uff09\u6216 -ERESTARTSYS\uff08\u7cfb\u7edf\u8c03\u7528\u88ab\u4e2d\u65ad\uff09\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u4f20\u8f93\u5c42\uff1atcp_accept \u51fd\u6570<\/h2>\n<p dir=\"auto\">tcp_accept \u51fd\u6570\u5728 TCP \u5c42\u8d1f\u8d23\u4ece\u76d1\u542c\u5957\u63a5\u5b57\u7684\u961f\u5217\u4e2d\u83b7\u53d6\u5df2\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u7684\u8fde\u63a5\u3002<\/p>\n<h3 dir=\"auto\">\u5de5\u4f5c\u6d41\u7a0b<\/h3>\n<ul dir=\"auto\">\n<li><strong>\u76d1\u542c\u72b6\u6001\u9a8c\u8bc1<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u786e\u8ba4\u5957\u63a5\u5b57\u5904\u4e8e TCP_LISTEN \u72b6\u6001\u3002<\/li>\n<li>\u4f7f\u7528 sk-&gt;inuse \u9501\u5b9a\u5957\u63a5\u5b57\uff0c\u9632\u6b62\u5e76\u53d1\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8fde\u63a5\u83b7\u53d6<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u8c03\u7528 tcp_dequeue_established \u4ece receive_queue \u4e2d\u83b7\u53d6\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\u3002<\/li>\n<li>\u5982\u679c\u961f\u5217\u4e3a\u7a7a\u4e14\u542f\u7528\u975e\u963b\u585e\u6a21\u5f0f\uff0c\u8fd4\u56de -EAGAIN\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8d44\u6e90\u7ba1\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u51cf\u5c11 ack_backlog \u8ba1\u6570\u5668\uff0c\u53cd\u6620\u5df2\u5904\u7406\u7684\u8fde\u63a5\u3002<\/li>\n<li>\u91ca\u653e\u76d1\u542c\u5957\u63a5\u5b57\u7684\u9501\uff0c\u5141\u8bb8\u5904\u7406\u540e\u7eed\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u8fde\u63a5\u961f\u5217\u7ec6\u8282<\/h3>\n<ul dir=\"auto\">\n<li>\u76d1\u542c\u5957\u63a5\u5b57\u7684 receive_queue \u5b58\u50a8\u4e0e\u8fde\u63a5\u5efa\u7acb\u76f8\u5173\u7684\u5305\uff08\u5982 SYN \u5305\uff09\u3002<\/li>\n<li>\u4e09\u6b21\u63e1\u624b\u5b8c\u6210\u540e\uff0c\u76f8\u5173\u5957\u63a5\u5b57\u88ab\u6807\u8bb0\u4e3a TCP_ESTABLISHED \u5e76\u8fd4\u56de\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u6df1\u5165\u5206\u6790\uff1atcp_conn_request \u51fd\u6570\u4e0e\u8fde\u63a5\u5efa\u7acb<\/h2>\n<p dir=\"auto\">\u5f53\u5ba2\u6237\u7aef\u53d1\u9001 SYN \u5305\u53d1\u8d77 TCP \u8fde\u63a5\u65f6\uff0ctcp_conn_request \u51fd\u6570\u88ab\u8c03\u7528\uff0c\u8d1f\u8d23\u521b\u5efa\u901a\u4fe1\u5957\u63a5\u5b57\u5e76\u5904\u7406\u8fde\u63a5\u8bf7\u6c42\u3002<\/p>\n<h3 dir=\"auto\">\u5173\u952e\u6b65\u9aa4<\/h3>\n<ol dir=\"auto\">\n<li><strong>\u5957\u63a5\u5b57\u521b\u5efa<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u5206\u914d\u65b0\u7684\u5957\u63a5\u5b57\u7ed3\u6784 (newsk)\uff0c\u590d\u5236\u76d1\u542c\u5957\u63a5\u5b57\u7684\u76f8\u5173\u5b57\u6bb5\u3002<\/li>\n<li>\u521d\u59cb\u5316\u961f\u5217\uff08write_queue\u3001receive_queue\u3001back_log\uff09\u548c TCP \u53c2\u6570\uff08\u5982 rtt\u3001mtu\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6570\u636e\u5305\u521b\u5efa<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u521b\u5efa SYN+ACK \u6570\u636e\u5305\u4ee5\u54cd\u5e94\u5ba2\u6237\u7aef\u3002<\/li>\n<li>\u8bbe\u7f6e TCP \u5934\u90e8\u5b57\u6bb5\uff0c\u5305\u62ec\u5e8f\u5217\u53f7\u548c\u7a97\u53e3\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u961f\u5217\u7ba1\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u5c06\u65b0\u5957\u63a5\u5b57\u4e0e SYN+ACK \u6570\u636e\u5305\u5173\u8054\u3002<\/li>\n<li>\u5c06\u6570\u636e\u5305\u63d2\u5165\u76d1\u542c\u5957\u63a5\u5b57\u7684 receive_queue\u3002<\/li>\n<li>\u589e\u52a0 ack_backlog \u8ba1\u6570\u5668\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6570\u636e\u4f20\u8f93<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u4f7f\u7528 queue_xmit \u53d1\u9001 SYN+ACK \u6570\u636e\u5305\u3002<\/li>\n<li>\u66f4\u65b0\u76d1\u542c\u5957\u63a5\u5b57\u548c\u65b0\u5957\u63a5\u5b57\u7684\u5185\u5b58\u5206\u914d\u8ba1\u6570\u5668\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3 dir=\"auto\">\u76d1\u542c\u4e0e\u901a\u4fe1\u5957\u63a5\u5b57\u7684\u5173\u7cfb<\/h3>\n<ul dir=\"auto\">\n<li>\u76d1\u542c\u5957\u63a5\u5b57\u7684 receive_queue \u5b58\u50a8\u4e0e\u65b0\u901a\u4fe1\u5957\u63a5\u5b57\u5173\u8054\u7684\u5305\uff0c\u5305\u542b\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u4e2d\u7684\u6570\u636e\u3002<\/li>\n<li>accept \u51fd\u6570\u5728\u8fde\u63a5\u5b8c\u6210\uff08TCP_ESTABLISHED \u72b6\u6001\uff09\u540e\u4ece\u8be5\u961f\u5217\u4e2d\u83b7\u53d6\u901a\u4fe1\u5957\u63a5\u5b57\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u5f00\u53d1\u8005\u5b9e\u8df5\u6307\u5357<\/h2>\n<p dir=\"auto\">\u5728\u5f00\u53d1\u4f7f\u7528 accept \u51fd\u6570\u7684\u7f51\u7edc\u5e94\u7528\u65f6\uff0c\u5e94\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul dir=\"auto\">\n<li><strong>\u53ef\u6269\u5c55\u6027<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u901a\u8fc7 listen() \u8bbe\u7f6e\u5408\u9002\u7684 backlog \u503c\uff0c\u4ee5\u5904\u7406\u591a\u4e2a\u5e76\u53d1\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n<li>\u4f7f\u7528\u975e\u963b\u585e\u5957\u63a5\u5b57 (O_NONBLOCK) \u63d0\u9ad8\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u7684\u54cd\u5e94\u80fd\u529b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u9519\u8bef\u5904\u7406<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u5904\u7406\u9519\u8bef\u5982 -EAGAIN\uff08\u65e0\u53ef\u7528\u8fde\u63a5\uff09\u6216 -EINVAL\uff08\u65e0\u6548\u5957\u63a5\u5b57\u72b6\u6001\uff09\u3002<\/li>\n<li>\u5bf9\u88ab\u4e2d\u65ad\u7684\u8fde\u63a5 (-ERESTARTSYS) \u5b9e\u73b0\u91cd\u8bd5\u673a\u5236\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5b89\u5168\u6027<\/strong>\uff1a\n<ul dir=\"auto\">\n<li>\u9a8c\u8bc1 accept \u8fd4\u56de\u7684\u5ba2\u6237\u7aef\u5730\u5740\uff0c\u9632\u6b62\u672a\u7ecf\u6388\u6743\u7684\u8bbf\u95ee\u3002<\/li>\n<li>\u76d1\u63a7 ack_backlog\uff0c\u907f\u514d\u56e0\u8fc7\u591a\u8fde\u63a5\u8bf7\u6c42\u5bfc\u81f4\u8d44\u6e90\u8017\u5c3d\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 dir=\"auto\">\u793a\u4f8b\u4ee3\u7801\u7247\u6bb5<\/h3>\n<div dir=\"auto\">\n<div data-testid=\"code-block\">\n<div>c<\/div>\n<div>\n<div>\n<div><\/div>\n<\/div>\n<\/div>\n<div><code><\/code><\/p>\n<div>\n<div>\n<div>#include &lt;sys\/socket.h&gt;<\/div>\n<div>#include &lt;netinet\/in.h&gt;<\/div>\n<div>#include &lt;stdio.h&gt;<\/div>\n<div>#include &lt;string.h&gt;<\/div>\n<div><\/div>\n<div>int main() {<\/div>\n<div>int server_fd, new_socket;<\/div>\n<div>struct sockaddr_in address;<\/div>\n<div>int addrlen = sizeof(address);<\/div>\n<div><\/div>\n<div>\/\/ \u521b\u5efa\u5957\u63a5\u5b57<\/div>\n<div>server_fd = socket(AF_INET, SOCK_STREAM, 0);<\/div>\n<div>if (server_fd == -1) {<\/div>\n<div>perror(&#8220;\u521b\u5efa\u5957\u63a5\u5b57\u5931\u8d25&#8221;);<\/div>\n<div>return -1;<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>\/\/ \u7ed1\u5b9a\u5e76\u76d1\u542c<\/div>\n<div>address.sin_family = AF_INET;<\/div>\n<div>address.sin_addr.s_addr = INADDR_ANY;<\/div>\n<div>address.sin_port = htons(8080);<\/div>\n<div>bind(server_fd, (struct sockaddr *)&amp;address, sizeof(address));<\/div>\n<div>listen(server_fd, 10);<\/div>\n<div><\/div>\n<div>\/\/ \u63a5\u53d7\u8fde\u63a5<\/div>\n<div>new_socket = accept(server_fd, (struct sockaddr *)&amp;address, (socklen_t *)&amp;addrlen);<\/div>\n<div>if (new_socket &lt; 0) {<\/div>\n<div>perror(&#8220;\u63a5\u53d7\u8fde\u63a5\u5931\u8d25&#8221;);<\/div>\n<div>return -1;<\/div>\n<div>}<\/div>\n<div><\/div>\n<div>printf(&#8220;\u8fde\u63a5\u5df2\u5efa\u7acb\\n&#8221;);<\/div>\n<div>return 0;<\/div>\n<div>}<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<h2 dir=\"auto\">\u7ed3\u8bba<\/h2>\n<p dir=\"auto\">accept \u51fd\u6570\u662f Linux \u5185\u6838\u4e2d TCP \u7f51\u7edc\u7f16\u7a0b\u7684\u57fa\u77f3\uff0c\u652f\u6301\u53ef\u9760\u7684\u5ba2\u6237\u7aef-\u670d\u52a1\u5668\u901a\u4fe1\u3002\u901a\u8fc7\u7406\u89e3\u5176\u5728\u5e94\u7528\u5c42\u3001BSD \u5957\u63a5\u5b57\u5c42\u3001INET \u5957\u63a5\u5b57\u5c42\u548c TCP \u5c42\u7684\u5b9e\u73b0\u673a\u5236\uff0c\u5f00\u53d1\u8005\u80fd\u591f\u6784\u5efa\u9ad8\u6548\u7684\u7f51\u7edc\u5e94\u7528\u3002\u76d1\u542c\u5957\u63a5\u5b57\u7684 receive_queue \u4e0e\u901a\u4fe1\u5957\u63a5\u5b57\u7684\u534f\u4f5c\u786e\u4fdd\u4e86\u8fde\u63a5\u7ba1\u7406\u7684\u6548\u7387\uff0c\u800c\u5408\u7406\u7684\u9519\u8bef\u5904\u7406\u548c\u8d44\u6e90\u5206\u914d\u8fdb\u4e00\u6b65\u63d0\u5347\u4e86\u7cfb\u7edf\u53ef\u9760\u6027\u3002<\/p>\n<h3 dir=\"auto\">\u6838\u5fc3\u8981\u70b9<\/h3>\n<ul dir=\"auto\">\n<li>accept \u51fd\u6570\u4ece\u76d1\u542c\u5957\u63a5\u5b57\u7684\u961f\u5217\u4e2d\u83b7\u53d6\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\u3002<\/li>\n<li>tcp_conn_request \u51fd\u6570\u521b\u5efa\u901a\u4fe1\u5957\u63a5\u5b57\u5e76\u7ba1\u7406 TCP \u4e09\u6b21\u63e1\u624b\u3002<\/li>\n<li>\u6b63\u786e\u914d\u7f6e\u5957\u63a5\u5b57\u53c2\u6570\u548c\u9519\u8bef\u5904\u7406\u673a\u5236\u662f\u6784\u5efa\u53ef\u6269\u5c55\u7f51\u7edc\u5e94\u7528\u7684\u5173\u952e\u3002<\/li>\n<\/ul>\n<p dir=\"auto\">\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u77e5\u8bc6\uff0c\u5f00\u53d1\u8005\u80fd\u591f\u4f18\u5316\u7f51\u7edc\u7f16\u7a0b\u5b9e\u8df5\uff0c\u6784\u5efa\u9ad8\u6548\u3001\u5b89\u5168\u7684\u670d\u52a1\u5668\u5e94\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u8a00\uff1a\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684 accept&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-208395","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208395"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208395\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}