{"id":36366,"date":"2025-05-09T14:35:54","date_gmt":"2025-05-09T06:35:54","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/36366.html"},"modified":"2025-05-09T14:35:54","modified_gmt":"2025-05-09T06:35:54","slug":"%e3%80%90%e6%9c%8d%e5%8a%a1%e5%99%a8%e9%80%9a%e4%bf%a1-accept%e3%80%91-int-acceptint-sockfd-struct-sockaddr-addr-socklen_t-addrlen%ef%bc%9b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/36366.html","title":{"rendered":"\u3010\u670d\u52a1\u5668\u901a\u4fe1-accept\u3011\u2014\u2014int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)\uff1b"},"content":{"rendered":"

#include <sys\/types.h>\u00a0\u00a0<\/p>\n

#include <sys\/socket.h><\/p>\n

int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/p>\n

sockfd:<\/p>\n

\u00a0\u00a0\u00a0 socket\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n

addr:<\/p>\n

\u00a0\u00a0\u00a0 \u4f20\u51fa\u53c2\u6570，\u8fd4\u56de\u94fe\u63a5\u5ba2\u6237\u7aef\u5730\u5740\u4fe1\u606f，\u542bIP\u5730\u5740\u548c\u7aef\u53e3\u53f7<\/p>\n

addrlen:<\/p>\n

\u00a0\u00a0\u00a0 \u4f20\u5165\u4f20\u51fa\u53c2\u6570<\/span>（\u503c-\u7ed3\u679c）,\u4f20\u5165sizeof(addr)\u5927\u5c0f，\u51fd\u6570\u8fd4\u56de\u65f6\u8fd4\u56de\u771f\u6b63\u63a5\u6536\u5230\u5730\u5740\u7ed3\u6784\u4f53\u7684\u5927\u5c0f<\/p>\n

\u8fd4\u56de\u503c：<\/p>\n

\u00a0\u00a0\u00a0 \u6210\u529f\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684socket\u6587\u4ef6\u63cf\u8ff0\u7b26，\u7528\u4e8e\u548c\u5ba2\u6237\u7aef\u901a\u4fe1，\u5931\u8d25\u8fd4\u56de-1，\u8bbe\u7f6eerrno<\/p>\n

\u89e3\u91ca\u5206\u6790：<\/p>\n

\n

\"\"<\/p>\n

\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b<\/p>\n

\u4e09\u6b21\u63e1\u624b\u5b8c\u6210\u540e，\u670d\u52a1\u5668\u8c03\u7528accept()\u63a5\u53d7\u8fde\u63a5<\/p>\n

\u5982\u679c\u670d\u52a1\u5668\u8c03\u7528accept()\u65f6\u8fd8\u6ca1\u6709\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u5c31\u963b\u585e\u7b49\u5f85\u76f4\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0a\u6765\u3002<\/p>\n

\n

addr\u662f\u4e00\u4e2a\u4f20\u51fa\u53c2\u6570，accept()\u8fd4\u56de\u65f6\u4f20\u51fa\u5ba2\u6237\u7aef\u7684\u5730\u5740\u548c\u7aef\u53e3\u53f7\u3002<\/p>\n

\u5982\u679c\u7ed9addr\u53c2\u6570\u4f20NULL，\u8868\u793a\u4e0d\u5173\u5fc3\u5ba2\u6237\u7aef\u7684\u5730\u5740\u3002<\/p>\n

\n

addrlen\u53c2\u6570\u662f\u4e00\u4e2a\u4f20\u5165\u4f20\u51fa\u53c2\u6570（value-result argument），<\/p>\n

\u4f20\u5165\u7684\u662f\u8c03\u7528\u8005\u63d0\u4f9b\u7684\u7f13\u51b2\u533aaddr\u7684\u957f\u5ea6\u4ee5\u907f\u514d\u7f13\u51b2\u533a\u6ea2\u51fa\u95ee\u9898，<\/p>\n

\u4f20\u51fa\u7684\u662f\u5ba2\u6237\u7aef\u5730\u5740\u7ed3\u6784\u4f53\u7684\u5b9e\u9645\u957f\u5ea6（\u6709\u53ef\u80fd\u6ca1\u6709\u5360\u6ee1\u8c03\u7528\u8005\u63d0\u4f9b\u7684\u7f13\u51b2\u533a）<\/p>\n

\u670d\u52a1\u5668\u7a0b\u5e8f\u7ed3\u6784：<\/p>\n

while (1) {<\/p>\n

\u00a0\u00a0\u00a0 cliaddr_len = sizeof(cliaddr);<\/p>\n

\u00a0\u00a0\u00a0 connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &cliaddr_len);<\/span><\/p>\n

\u00a0\u00a0\u00a0 n = read(connfd, buf, MAXLINE);<\/p>\n

\u00a0\u00a0\u00a0 ……<\/p>\n

\u00a0\u00a0\u00a0 close(connfd);<\/p>\n

}<\/p>\n

\u6574\u4e2a\u662f\u4e00\u4e2awhile\u6b7b\u5faa\u73af，\u6bcf\u6b21\u5faa\u73af\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n

\u7531\u4e8ecliaddr_len\u662f\u4f20\u5165\u4f20\u51fa\u53c2\u6570，\u6bcf\u6b21\u8c03\u7528accept()\u4e4b\u524d\u5e94\u8be5\u91cd\u65b0\u8d4b\u521d\u503c\u3002<\/p>\n

accept()\u7684\u53c2\u6570listenfd\u662f\u5148\u524d\u7684\u76d1\u542c\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n

accept()\u7684\u8fd4\u56de\u503c\u662f\u53e6\u5916\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26connfd，\u4e4b\u540e\u4e0e\u5ba2\u6237\u7aef\u4e4b\u95f4\u5c31\u901a\u8fc7\u8fd9\u4e2aconnfd\u901a\u8baf<\/p>\n

\u6700\u540e\u5173\u95edconnfd\u65ad\u5f00\u8fde\u63a5，\u800c\u4e0d\u5173\u95edlistenfd<\/span><\/p>\n

\u518d\u6b21\u56de\u5230\u5faa\u73af\u5f00\u5934listenfd\u4ecd\u7136\u7528\u4f5caccept\u7684\u53c2\u6570\u3002<\/p>\n

accept()\u6210\u529f\u8fd4\u56de\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26，\u51fa\u9519\u8fd4\u56de-1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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