{"id":32946,"date":"2025-04-26T08:40:35","date_gmt":"2025-04-26T00:40:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/32946.html"},"modified":"2025-04-26T08:40:35","modified_gmt":"2025-04-26T00:40:35","slug":"linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-tcp-%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%9a%e5%a4%9a%e8%bf%9b%e7%a8%8b%e6%9e%b6%e6%9e%84%e4%b8%8e%e7%ab%af%e5%8f%a3%e5%a4%8d%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/32946.html","title":{"rendered":"Linux\u7f51\u7edc\u7f16\u7a0b TCP---\u5e76\u53d1\u670d\u52a1\u5668\uff1a\u591a\u8fdb\u7a0b\u67b6\u6784\u4e0e\u7aef\u53e3\u590d\u7528\u6280\u672f\u5b9e\u6218\u6307\u5357"},"content":{"rendered":"

\u77e5\u8bc6\u70b91\u3010\u5e76\u53d1\u670d\u52a1\u5668\u2014\u591a\u8fdb\u7a0b\u7248\u3011<\/h2>\n

\u5e76\u53d1\u670d\u52a1\u5668：\u670d\u52a1\u5668\u53ef\u4ee5\u540c\u65f6\u670d\u52a1\u591a\u4e2a\u5ba2\u6237\u7aef<\/p>\n

\u9996\u5148\u590d\u4e60\u4e00\u4e0b\u670d\u52a1\u5668\u7684\u521b\u5efa\u8fc7\u7a0b（\u5982\u4e0b\u56fe）<\/p>\n

1\u3001\u76d1\u542c\u5957\u63a5\u5b57（\u5957\u63a5\u5b57\u2192\u7ed1\u5b9a\u2192\u76d1\u542c（\u8fde\u63a5\u961f\u5217））<\/p>\n

2\u3001\u5229\u7528accept\u4ece\u8fde\u63a5\u961f\u5217\u7684\u5df2\u8fde\u63a5\u533a（\u5b8c\u6210\u4e09\u6b21\u63e1\u624b）\u5c06\u5ba2\u6237\u7aef\u63d0\u53d6\u51fa\u6765，\u6b64\u65f6\u4ea7\u751f \u5df2\u8fde\u63a5\u5957\u63a5\u5b57<\/p>\n

\"\"<\/p>\n

\u73b0\u5728\u6211\u4eec\u7ed3\u5408\u591a\u8fdb\u7a0b，\u5b8c\u6210\u7684\u529f\u80fd\u662f\u7236\u8fdb\u7a0b\u8d1f\u8d23\u76d1\u542c，\u800c\u6bcf\u4e2a\u5b50\u8fdb\u7a0b\u90fd\u53ea\u8d1f\u8d23\u7ba1\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef<\/p>\n

\u56e0\u6b64，\u5b50\u7236\u8fdb\u7a0b\u4e2d \u4e0d\u80fd\u6709\u5df2\u8fde\u63a5\u5957\u63a5\u5b57，\u800c\u5b50\u8fdb\u7a0b\u4e2d\u4e0d\u80fd\u6709\u76d1\u542c\u5957\u63a5\u5b57\u3002\u8ba9\u6211\u4eec\u5148\u5b9e\u73b0\u4ee5\u4e0b\u8fd9\u4e2a\u4ee3\u7801！<\/p>\n

\u8fd9\u91cc\u8bf4\u4e00\u4e0b，\u5e76\u53d1\u670d\u52a1\u5668\u5c31\u662f\u8fd9\u6837\u7684\u6d41\u7a0b，\u5982\u679c\u6682\u65f6\u7406\u89e3\u4e0d\u4e86，\u8bf7\u5148\u80cc\u4e0b\u6765\u3002<\/p>\n

\u4ee3\u7801\u6f14\u793a<\/h4>\n

#include <stdio.h>
\n#include <arpa\/inet.h>
\n#include <netinet\/in.h>
\n#include <stdio.h>
\n#include <sys\/socket.h>
\n#include <string.h>
\n#include <sys\/types.h> \/\/listen
\n#include <errno.h>
\n#include <signal.h> \/\/signal
\n#include <sys\/wait.h> \/\/waitpid
\n#include <unistd.h>
\n#include <stdlib.h> \/\/atoi<\/p>\n

\/\/\u4e3b\u8fdb\u7a0b\u91ca\u653e\u5b50\u8fdb\u7a0b\u7a7a\u95f4\u51fd\u6570\u58f0\u660e
\nvoid my_waitpid(int signal);<\/p>\n

\/\/\u5b50\u8fdb\u7a0b\u4e2d\u51fd\u6570\u4f53\u7684\u58f0\u660e
\nvoid fun_subprocess(int fd_sock_accept);<\/p>\n

int main(int argc, char const *argv[])
\n{
\n \/\/\u6307\u4ee4\u53c2\u6570\u4e2a\u6570\u5224\u65ad
\n if(argc != 2)
\n {
\n printf("demo:.\/a.out num_of_port");
\n return 0;
\n }<\/p>\n

\/\/\u521b\u5efa（\u76d1\u542c）\u5957\u63a5\u5b57，\u975e\u6cd5\u5224\u65ad
\n int fd_sock_listen = socket(AF_INET,SOCK_STREAM,0);
\n if(fd_sock_listen < 0)
\n {
\n printf("socket");
\n _exit(-1);
\n }<\/p>\n

\/\/\u7ed1\u5b9a\u5e76\u975e\u6cd5\u5224\u65ad：\u5148\u521b\u5efa\u5730\u5740\u7ed3\u6784\u4f53，\u7136\u540e\u7ed1\u5b9a\u5957\u63a5\u5b57，\u8fd9\u91cc\u6211\u4eec\u8bbe\u7f6e\u7aef\u53e3\u53f7\u4e3a8000.
\n struct sockaddr_in addr_bind;
\n addr_bind.sin_family = AF_INET;
\n addr_bind.sin_port = htons(atoi(argv[1]));
\n addr_bind.sin_addr.s_addr = htonl(INADDR_ANY);
\n int ret_bind = bind(fd_sock_listen,(struct sockaddr *)&addr_bind,sizeof(addr_bind));
\n if(ret_bind != 0)
\n {
\n perror("bind");
\n _exit(-1);
\n }<\/p>\n

\/\/\u76d1\u542c，\u5c06\u5957\u63a5\u5b57\u8bbe\u4e3a\u76d1\u542c\u5957\u63a5\u5b57，\u5e76\u8fde\u63a5\u961f\u5217 \u7684\u5927\u5c0f\u8bbe\u7f6e\u4e3a10
\n int ret_listen = listen(fd_sock_listen,10);
\n if(ret_listen != 0)
\n {
\n perror("listen");
\n _exit(-1);
\n }<\/p>\n

\/\/\u5faa\u73af\u4e2d \u5148accept，\u5728\u521b\u5efa\u5b50\u8fdb\u7a0b：\u5148accpet\u53ef\u4ee5\u8ba9\u6bcf\u4e2a\u5b50\u8fdb\u7a0b\u90fd\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a\u5df2\u8fde\u63a5\u5957\u63a5\u5b57
\n \/\/\u53c8\u56e0\u4e3aaccept\u662f\u5e26\u963b\u585e\u7684，\u4e0d\u5fc5\u62c5\u5fc3，\u5b50\u8fdb\u7a0b\u7684\u591a\u521b\u5efa\u95ee\u9898
\n while(1)
\n {
\n \/\/accept \u4ece \u5df2\u8fde\u63a5\u961f\u5217\u4e2d\u63d0\u53d6\u5df2\u8fde\u63a5\u5957\u63a5\u5b57：\u76d1\u542c\u5957\u63a5\u5b57
\n \/\/\u8fd9\u91cc\u7684\u5730\u5740\u7ed3\u6784\u4f53，\u662f\u7528\u6765\u5b58\u50a8 \u5ba2\u6237\u7aef\u7684\u5730\u5740\u4fe1\u606f
\n struct sockaddr_in addr_accept;
\n bzero(&addr_accept,sizeof(addr_accept));
\n int len_accept = sizeof(addr_accept);
\n int fd_sock_accpet = accept(fd_sock_listen,(struct sockaddr *)&addr_accept,&len_accept);
\n if(fd_sock_accpet < 0)
\n {
\n if((errno == ECONNABORTED) || (errno == EINTR))
\n {
\n continue;
\n }
\n else
\n {
\n perror("accept");
\n close(fd_sock_listen);
\n _exit(-1);
\n }
\n }
\n \/\/\u8fd9\u91cc\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u8fde\u63a5\u6210\u529f，\u904d\u5386\u4e00\u6761\u6d88\u606f\u8bf4\u660e\u662f \u5ba2\u6237\u7aef\u7684IP\u548c\u7aef\u53e3\u53f7
\n unsigned short port = ntohs(addr_accept.sin_port);
\n char buf_IP[16] = "";
\n inet_ntop(AF_INET,&addr_accept.sin_addr.s_addr,buf_IP,sizeof(buf_IP));<\/p>\n

\/\/\u521b\u5efa\u5b50\u8fdb\u7a0b，\u6bcf\u4e2a\u5b50\u8fdb\u7a0b\u4e2d\u9700\u8981\u5173\u95ed
\n int pid = fork();
\n if(pid == 0)\/\/\u5b50\u8fdb\u7a0b，\u5173\u95ed\u76d1\u542c\u5957\u63a5\u5b57–>\u6267\u884c\u4efb\u52a1\u4f53–>\u5173\u95ed\u5df2\u8fde\u63a5\u5957\u63a5\u5b57–>\u9000\u51fa\u5b50\u8fdb\u7a0b
\n {
\n \/\/\u904d\u5386\u5904 \u5ba2\u6237\u7aef\u8fde\u63a5\u7684\u5b50\u8fdb\u7a0b
\n printf("\u5ba2\u6237\u7aefIP：%s，\u7aef\u53e3\u53f7：%hu\u5df2\u8fde\u63a5，\u4e3a\u5176\u5206\u914d\u7684\u8fdb\u7a0bID\u662f：%d\\\\\\\\n",buf_IP,port,getpid());<\/p>\n

\/\/\u6267\u884c\u76d1\u542c\u5957\u63a5\u5b57
\n close(fd_sock_listen);<\/p>\n

\/\/\u6267\u884c\u4efb\u52a1\u4f53，\u8981\u5b9e\u73b01\u3001\u6570\u636e\u7684\u63a5\u6536，\u5e76\u904d\u5386\u5728\u670d\u52a1\u5668\u7684\u7ec8\u7aef，2\u3001\u5c06\u6536\u5230\u7684\u6570\u636e\u8fd4\u56de\u5ba2\u6237\u7aef
\n fun_subprocess(fd_sock_accpet);<\/p>\n

\/\/\u5173\u95ed\u5df2\u8fde\u63a5\u5957\u63a5\u5b57
\n close(fd_sock_accpet);<\/p>\n

\/\/\u9000\u51fa\u5b50\u8fdb\u7a0b
\n _exit(0);
\n }
\n else\/\/\u7236\u8fdb\u7a0b，\u5173\u95ed\u5df2\u8fde\u63a5\u5957\u63a5\u5b57
\n {
\n close(fd_sock_accpet);<\/p>\n

\/\/\u7236\u8fdb\u7a0b，\u8d1f\u8d23\u5904\u7406\u56de\u6536\u8fdb\u7a0b\u7a7a\u95f4，\u8fd9\u91cc\u56de\u6536\u7a7a\u95f4\u6211\u4eec\u91c7\u7528 \u7b49\u5f85\u4fe1\u53f7SIGCHLD\u7684\u65b9\u5f0f
\n signal(SIGCHLD,my_waitpid);
\n }
\n }
\n close(fd_sock_listen);
\n return 0;
\n}<\/p>\n

\/\/\u4e3b\u8fdb\u7a0b\u91ca\u653e\u5b50\u8fdb\u7a0b\u7a7a\u95f4\u51fd\u6570\u5b9e\u73b0
\nvoid my_waitpid(int signal)
\n{
\n while(1)
\n {
\n int ret = waitpid(-1,NULL,WNOHANG);
\n if(ret == 0 || ret == -1)
\n {
\n \/\/\u5b50\u8fdb\u7a0b\u7a7a\u95f4\u88ab\u91ca\u653e\u9000\u51fa
\n break;
\n }
\n else if(ret > 0)
\n {
\n printf("\u5b50\u8fdb\u7a0b%d\u5df2\u7ecf\u9000\u51fa\\\\\\\\n",ret);
\n }
\n \/\/\u6ce8\u610f\u8fd9\u91cc\u4e00\u5b9a\u4e0d\u8981\u7b49\u5f85\u5168\u90e8\u8fdb\u7a0b\u9000\u51fa，\u5373\u53ea\u5224\u65ad\u8fd4\u56de\u503c\u662f-1\u7684\u60c5\u51b5，\u4f1a\u5faa\u73af\u5835\u585e\u7684，\u5e94\u8be5\u662f\u68c0\u6d4b\u5230\u4e00\u4e2a\u91ca\u653e\u5c31\u9000\u51fa\u4e00\u6b21
\n \/\/\u56e0\u4e3a\u8fd9\u91cc\u6211\u4eec\u662f\u4fe1\u53f7\u68c0\u6d4b，\u4e00\u65e6\u6709\u5b50\u8fdb\u7a0b\u9000\u51fa\u7684\u4fe1\u53f7\u5c31\u4f1a\u8fdb\u5165\u8fd9\u4e2a\u51fd\u6570\u4e00\u6b21
\n \/\/\u8fd9\u662f\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u53d1\u73b0\u7684\u95ee\u9898
\n }
\n return;
\n}<\/p>\n

\/\/\u5b50\u8fdb\u7a0b\u4e2d\u51fd\u6570\u4f53\u7684\u5b9e\u73b0,\u5b9e\u73b01\u3001\u6570\u636e\u7684\u63a5\u6536，\u5e76\u904d\u5386\u5728\u670d\u52a1\u5668\u7684\u7ec8\u7aef，2\u3001\u5c06\u6536\u5230\u7684\u6570\u636e\u8fd4\u56de\u5ba2\u6237\u7aef
\nvoid fun_subprocess(int fd_sock_accept)
\n{
\n while(1)
\n {
\n \/\/1500\u6700\u5b89\u5168，\u56e0\u4e3a\u4ee5\u592a\u7f51\u7684\u6700\u5927\u4f20\u8f93\u5355\u5143（MTU）\u662f1500Byte
\n char buf_recv[1500] = "";
\n int len = recv(fd_sock_accept,buf_recv,sizeof(buf_recv),0);
\n printf("%s\\\\\\\\n",buf_recv);
\n \/\/TCP（\u4f20\u8f93\u63a7\u5236\u534f\u8bae），\u662f\u5f53\u6536\u5230\u5185\u5bb9\u957f\u5ea6\u4e3a0\u7684\u65f6\u5019，\u5148\u8f93\u51fa\u5185\u5bb9，\u7136\u540e\u670d\u52a1\u5668\u4f1a\u9000\u51fa
\n if(len == 0)
\n {
\n break;
\n }
\n send(fd_sock_accept,buf_recv,sizeof(buf_recv),0);
\n }
\n}<\/p>\n

\u4ee3\u7801\u8fd0\u884c\u7ed3\u679c<\/h4>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u8fd9\u4e2a\u5ba2\u6237\u7aef\u8bbe\u8ba1\u7684\u529f\u80fd\u6d41\u7545\u5ea6 \u662f\u5f88\u5b8c\u5584\u7684，\u5e76\u53d1\u670d\u52a1\u5668\u5c31\u662f\u8fd9\u6837，\u5957\u6a21\u677f\u5c31\u53ef\u4ee5，\u5e0c\u671b\u5927\u5bb6\u5728\u7406\u89e3\u7684\u57fa\u7840\u4e0a\u8bb0\u5fc6，\u5907\u6ce8\u5f88\u8be6\u7ec6，\u5982\u679c\u4ecd\u6709\u7591\u95ee\u53ef\u4ee5\u79c1\u4fe1\u6216\u8005\u8bc4\u8bba\u7559\u8a00，\u6211\u770b\u5230\u4e86\u4f1a\u56de\u590d\u8ba8\u8bba\u3002<\/p>\n

\u77e5\u8bc6\u70b92\u3010\u7aef\u53e3\u590d\u7528\u3011<\/h2>\n

\u8fd9\u91cc\u6211\u4eec\u6f14\u793a\u4e00\u4e2a\u73b0\u8c61，\u670d\u52a1\u5668\u4e3b\u52a8\u65ad\u5f00\u540e，\u4f1a\u6709\u4e00\u6bb5\u65f6\u95f4\u670d\u52a1\u5668\u65e0\u6cd5\u4f7f\u7528，\u662f\u4e3a\u4ec0\u4e48\u5462？\u56e0\u4e3a \u7aef\u53e3\u4ecd\u4e0e \u4e0a\u4e00\u4e2a\u670d\u52a1\u5668\u7684\u5957\u63a5\u5b57 \u4e4b\u95f4\u6709\u8054\u7cfb（\u5ba2\u6237\u7aef\u7684TIME_WAIT\u72b6\u6001）\u3002<\/p>\n

\u6b64\u65f6\u7684\u7aef\u53e3\u53ea\u80fd\u7ed1\u5b9a\u4e00\u4e2a\u5957\u63a5\u5b57<\/p>\n

1\u3001\u95ee\u9898\u73b0\u8c61\u6f14\u793a<\/h3>\n

\"\"<\/p>\n

\u4e3a\u4e86\u89e3\u51b3\u670d\u52a1\u5668\u91cd\u542f\u540e，\u5730\u5740\u88ab\u5360\u7528，\u5bfc\u81f4\u5ba2\u6237\u7aef\u9700\u8981\u7b49\u5f85\u7684\u95ee\u9898，\u6211\u4eec\u5c31\u8981\u5f15\u5165\u7aef\u53e3\u590d\u7528<\/p>\n

2\u3001\u7aef\u53e3\u590d\u7528\u7684\u6982\u8ff0<\/h3>\n

\u7aef\u53e3\u590d\u7528：\u5141\u8bb8\u5728\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f \u53ef\u4ee5\u628an\u4e2a\u5957\u63a5\u5b57\u7ed1\u5b9a\u5728\u4e00\u4e2a\u7aef\u53e3\u4e0a\u800c\u4e0d\u51fa\u9519<\/p>\n

\u65b9\u6cd5：\u5229\u7528setsockopt \u51fd\u6570\u4e0e SO_REUSEADDR \u5b9e\u73b0<\/p>\n

\u8fd9\u4e2a\u51fd\u6570\u5728UDP\u7684\u591a\u64ad\u548c\u5e7f\u64ad\u4e2d\u4e5f\u6709\u4f7f\u7528，\u540e\u9762\u6211\u4f1a\u5bf9UDP\u7684\u5185\u5bb9\u8fdb\u884c\u8865\u5145\u3002<\/p>\n

\u6ce8\u610f：\u7f6e\u7aef\u53e3\u590d\u7528\u51fd\u6570\u8981\u5728\u7ed1\u5b9a\u4e4b\u524d\u8c03\u7528，\u800c\u4e14\u53ea\u8981\u7ed1\u5b9a\u5728\u540c\u4e00\u4e2a\u7aef\u53e3\u7684\u6240\u6709\u5957\u63a5\u5b57\u90fd\u5f97\u8bbe\u7f6e\u590d\u7528<\/p>\n

\u76ee\u7684：\u80fd\u591f\u4fdd\u8bc1\u670d\u52a1\u5668\u91cd\u542f\u540e，\u80fd\u591f\u7acb\u9a6c\u8fd0\u884c，\u5176\u4ed6\u5ba2\u6237\u7aef\u65e0\u9700\u7b49\u5f85\u3002<\/p>\n

3\u3001\u7aef\u53e3\u590d\u7528\u7684\u5b9e\u73b0<\/h3>\n

\u7aef\u53e3\u590d\u7528\u7684\u6a21\u5f0f\u662f\u56fa\u5b9a\u7684，\u4e3b\u8981\u8bb0\u5fc6，\u7aef\u53e3\u590d\u7528\u7684\u5b9e\u73b0\u65b9\u6cd5，\u4e0e\u7aef\u53e3\u590d\u7528\u7684\u4f4d\u7f6e<\/p>\n

\u5b9e\u73b0\u65b9\u6cd5：<\/p>\n

\/\/\u7aef\u53e3\u590d\u7528\u7684\u5b9e\u73b0
\n int opt = 1;
\n setsockopt(fd_sock_listen,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));<\/p>\n

\u4f4d\u7f6e：<\/p>\n

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