{"id":57458,"date":"2025-08-15T12:51:39","date_gmt":"2025-08-15T04:51:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/57458.html"},"modified":"2025-08-15T12:51:39","modified_gmt":"2025-08-15T04:51:39","slug":"tcp%e6%9c%8d%e5%8a%a1%e5%99%a8linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e8%ae%be%e8%ae%a1%e6%b5%81%e7%a8%8b%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/57458.html","title":{"rendered":"TCP\u670d\u52a1\u5668Linux\u7f51\u7edc\u7f16\u7a0b\u8bbe\u8ba1\u6d41\u7a0b\u8be6\u89e3"},"content":{"rendered":"

\u4e00\u3001TCP \u670d\u52a1\u5668\u8bbe\u8ba1\u6d41\u7a0b<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TCP\u8fde\u63a5\u7684\u670d\u52a1\u5668\u6a21\u5f0f\u7684\u7a0b\u5e8f\u8bbe\u8ba1\u6d41\u7a0b\u4e3b\u8981\u5206\u4e3a：\u5957\u63a5\u5b57\u521d\u59cb\u5316( socket()\u51fd\u6570)，\u5957\u63a5\u5b57\u4e0e\u7aef\u53e3\u7684\u7ed1\u5b9a(bind()\u51fd\u6570)，\u8bbe\u7f6e\u670d\u52a1\u5668\u7684\u4fa6\u542c\u8fde\u63a5(listen()\u51fd\u6570)，\u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5(accept()\u51fd\u6570)，\u63a5\u6536\u548c\u53d1\u9001\u6570\u636e（read()\u51fd\u6570\u3001write()\u51fd\u6570）\u5e76\u8fdb\u884c\u6570\u636e\u5904\u7406\u53ca\u5904\u7406\u5b8c\u6bd5\u7684\u5957\u63a5\u5b57\u5173\u95ed（close()\u51fd\u6570)\u3002<\/p>\n

\"\"<\/p>\n

1\u3001socket() \u51fd\u6570<\/h4>\n

#include <sys\/types.h>\u00a0 \u00a0 \u00a0\/* See NOTES *\/
\n#include <sys\/socket.h>
\nint socket(int domain, int type, int protocol);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0socket()\u51fd\u6570\u51fd\u6570\u5efa\u7acb\u4e00\u4e2a\u534f\u8bae\u65cf\u4e3adomain\u3001\u534f\u8bae\u7c7b\u578b\u4e3atype\u3001\u534f\u8bae\u7f16\u53f7\u4e3a protocol\u7684\u5957\u63a5\u5b57\u6587\u4ef6 \u63cf\u8ff0\u7b26\u3002\u5982\u679c\u51fd\u6570\u8c03\u7528\u6210\u529f，\u4f1a\u8fd4\u56de\u4e00\u4e2a\u8868\u793a\u8fd9\u4e2a\u5957\u63a5\u5b57\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5931\u8d25\u7684\u65f6\u5019\u56de-1\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u51fd\u6570socket()\u7684\u53c2\u6570domain\u7528\u4e8e\u8bbe\u7f6e\u7f51\u7edc\u901a\u4fe1\u7684\u57df,\u51fd\u6570socket()\u6839\u636e\u8fd9\u4e2a\u53c2\u6570\u9009\u62e9\u901a\u4fe1\u534f\u8bae\u7684\u65cf\u3002 \u901a\u4fe1\u534f\u8bae\u65cf\u5728\u6587\u4ef6sys\/socket.h \u4e2d\u5b9a\u4e49<\/p>\n

\"\"<\/p>\n

\u51fd\u6570socket()\u7684\u53c2\u6570 type\u7528\u4e8e\u8bbe\u7f6e\u5957\u63a5\u5b57\u901a\u4fe1\u7684\u7c7b\u578b\u3002\u4e3b\u8981\u6709<\/p>\n

\"\"<\/p>\n

\u51fd\u6570socket()\u7684\u53c2\u6570protocol\u4e00\u822c\u8bbe\u7f6e\u4e3a0\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u51fd\u6570socket()\u5e76\u4e0d\u603b\u662f\u6267\u884c\u6210\u529f，\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u9519\u8bef，\u9519\u8bef\u7684\u4ea7\u751f\u6709\u591a\u79cd\u539f\u56e0，\u53ef\u4ee5\u901a\u8fc7 \u83b7 errno \u5f97\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\u9020\u6210\u51fd\u6570 socket()\u5931\u8d25\u7684\u539f\u56e0\u662f\u8f93\u5165\u7684\u53c2\u6570\u9519\u8bef\u9020\u6210\u7684，\u4f8b\u5982\u67d0\u4e2a\u534f\u8bae\u4e0d\u5b58\u5728\u7b49， \u8fd9\u65f6\u9700\u8981\u8be6\u7ec6\u68c0\u67e5\u51fd\u6570\u7684\u8f93\u5165\u53c2\u6570\u3002\u7531\u4e8e\u51fd\u6570\u7684\u8c03\u7528\u4e0d\u4e00\u5b9a\u6210\u529f，\u5728\u8fdb\u884c\u7a0b\u5e8f\u8bbe\u8ba1\u7684\u65f6\u5019，\u4e00\u5b9a\u8981\u68c0\u67e5\u8fd4\u56de\u503c\u3002<\/p>\n

\"\"<\/p>\n

\u5982\u679c\u8fdb\u884cTCP\u7f16\u7a0b，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u4ee3\u7801\u5efa\u7acb\u4e00\u4e2a\u6d41\u5f0f\u5957\u63a5\u5b57：<\/p>\n

\/\/\u521d\u59cb\u5316socket\u5957\u63a5\u5b57
\nserver_fd = socket(AF_INET, SOCK_STREAM, 0);
\nif (-1 == server_fd)
\n{
\n\/\/perror \u6839\u636eerror\u7684\u503c\u6253\u5370\u51fa\u9519\u7684\u539f\u56e0
\nperror("socket() error");
\nreturn 0;
\n}<\/p>\n

2\u3001bind() \u51fd\u6570<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bind() \u51fd\u6570\u7528\u4e8e\u7ed1\u5b9a\u4e00\u4e2a\u5730\u5740\u7aef\u53e3，\u5728\u5efa\u7acb\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\u6210\u529f\u540e，\u9700\u8981\u5bf9\u5957\u63a5\u5b57\u8fdb\u884c\u5730\u5740\u548c\u7aef \u53e3\u7684\u7ed1\u5b9a，\u624d\u80fd\u8fdb\u884c\u6570\u636e\u7684\u63a5\u6536\u548c\u53d1\u9001\u64cd\u4f5c\u3002<\/p>\n

bind() \u51fd\u6570\u539f\u578b\u5982\u4e0b：<\/p>\n

#include <sys\/types.h>\u00a0 \/* See NOTES *\/
\n#include <sys\/socket.h>
\nint bind(int sockfd,\u00a0 const struct sockaddr *addr, socklen_t addrlen);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bind() \u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570sockfd\u662fsocket() \u51fd\u6570\u521b\u5efa\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002bind() \u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570addr\u6307\u5411\u4e00\u4e2a\u7ed3\u6784\u4e3asockaddr\u53c2\u6570\u7684\u6307\u9488，sockaddr\u4e2d\u5305\u542b\u4e86\u7aef\u53e3\u548cIP\u5730\u5740\u7684\u4fe1\u606f\u3002\u5728\u8fdb\u884c\u5730\u5740\u7ed1\u5b9a\u7684\u65f6\u5019，\u9700\u8981\u5148\u5c06\u5730\u5740\u7ed3\u6784\u4e2d\u7684IP\u5730\u5740\u3001\u7aef\u53e3\u3001\u7c7b\u578b\u7b49\u7ed3\u6784struct sockaddr\u4e2d\u7684\u57df\u8fdb\u884c\u8bbe\u7f6e\u540e\u624d\u80fd\u8fdb\u884c\u7ed1\u5b9a，\u8fd9\u6837\u8fdb\u884c\u7ed1\u5b9a\u540e\u624d\u80fd\u5c06\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0e\u5730\u5740\u7b49\u7ed3\u5408\u5728\u4e00\u8d77\u3002<\/p>\n

struct sockaddr \u7ed3\u6784\u4f53\u7684\u539f\u578b\u5982\u4e0b：<\/p>\n

struct sockaddr{
\nsa_family_t\u00a0 \u00a0 \u00a0sa_family:\/\/\u7528\u5730\u5740\u7c07\u4e2d\u7684\u54ea\u4e2a\u534f\u8bae
\nchar\u00a0 \u00a0 sa_data[14];
\n}<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5982\u679c\u901a\u8fc7struct sockaddr \u7ed3\u6784\u4f53\u8bbe\u7f6eIP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u7b49\u4fe1\u606f\u4f1a\u975e\u5e38\u590d\u6742，\u5728\u8fdb\u884cTCP\u7f16\u7a0b\u65f6， \u6211\u4eec\u4f7f\u7528struct sockaddr_in\u7ed3\u6784\u4f53：<\/p>\n

struct in_addr{\u00a0 \u00a0\/\/IP \u5730\u5740\u7ed3\u6784
\n_be32\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0s_addr;
\n}；
\nstruct sockaddr_in {
\n_kernel_sa_family_t\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sin_family;\u00a0 \u00a0 \/* Address family
\n_be16\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0sin_port;\u00a0 \u00a0 \u00a0 \u00a0\/* Port number
\nstruct in_addr\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sin_addr;\u00a0 \u00a0\/* Internet address<\/p>\n

\n\/* Pad to size of 'struct sockaddr'.*\/
\nunsigned char\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 _pad[_SOCK_SIZE_-sizeof(short int)\u00a0 –\u00a0 sizeof(unsigned short int)\u00a0 – sizeof(struct in_addr)]；
\n}；<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bind() \u51fd\u6570\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570addrlen\u662fstruct sockaddr \u7ed3\u6784\u4f53\u7684\u957f\u5ea6，\u6240\u4ee5\u4e00\u822c\u8bbe\u7f6e\u4e3a：sizeof (struct sockaddr \u7ed3\u6784\u4f53)；<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u4ee3\u7801\u7ed1\u5b9a\u4e00\u4e2a\u5730\u5740\u7aef\u53e3：<\/p>\n

struct sockaddr_in in;
\nin.sin_family = AF_INET;
\n\/\/\u8bbe\u7f6e\u7aef\u53e3\u53f7
\nin.sin_port = htons(8888);
\n\/\/\u8bbe\u7f6eIP\u5730\u5740，\u4f7f\u7528\u81ea\u5df1\u8bbe\u5907\u7684IP\u5730\u5740
\nin.sin_addr.s_addr = inet_addr("172.26.141.165");\/\/\u5c06\u4e00\u4e2a\u70b9\u5206\u5341\u8fdb\u5236\u7684IP\u8f6c\u6362\u6210\u4e00\u4e2a\u957f\u6574\u578b\u6570<\/p>\n

int ret;
\nret = bind(server_fd, (struct sockaddr*)&in, sizeof(struct sockaddr));
\nif (-1 == ret)
\n{
\n\/\/perror \u6839\u636eerror\u7684\u503c\u6253\u5370\u51fa\u9519\u7684\u539f\u56e0
\nperror("bind() error");
\nreturn 0;
\n}<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\u6211\u4eec\u5bf9\u5bf9\u53e3\u53f7\u8fdb\u884c\u8d4b\u503c\u65f6\u4f7f\u7528\u4e86htons()\u51fd\u6570，\u8fd9\u4e2a\u51fd\u6570\u7684\u529f\u80fd\u662f\u5c06\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362 \u6210\u7f51\u7edc\u5b57\u8282\u5e8f，inet_addr\u4e5f\u662f\u5c06\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362\u6210\u7f51\u7edc\u5b57\u8282\u5e8f\u3002<\/p>\n

（1）\u8f6c\u6362\u51fd\u6570:<\/p>\n

\u5c06\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362\u6210\u7f51\u7edc\u5b57\u8282\u5e8f：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0htons()：\u8868\u793a\u5bf9\u4e8eshort\u7c7b\u578b\u7684\u53d8\u91cf，\u4ece\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0htonl()：\u8868\u793a\u5bf9\u4e8elong \u7c7b\u578b\u7684\u53d8\u91cf，\u4ece\u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f<\/p>\n

\u5c06\u7f51\u7edc\u5b57\u8282\u5e8f\u8f6c\u6362\u6210\u4e3b\u673a\u5b57\u8282\u5e8f：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ntohs()：\u8868\u793a\u5bf9\u4e8eshort\u7c7b\u578b\u7684\u53d8\u91cf，\u4ece\u7f51\u7edc\u5b57\u8282\u5e8f\u8f6c\u6362\u4e3a\u4e3b\u673a\u5b57\u8282\u5e8f<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ntohl()：\u8868\u793a\u5bf9\u4e8elong\u7c7b\u578b\u7684\u53d8\u91cf，\u4ece\u7f51\u7edc\u5b57\u8282\u5e8f\u8f6c\u6362\u4e3a\u4e3b\u673a\u5b57\u8282\u5e8f<\/p>\n

3\u3001listen() \u51fd\u6570<\/h4>\n

listen()\u51fd\u6570\u53ef\u4ee5\u76d1\u542c\u672c\u5730\u7aef\u53e3，listen\u51fd\u6570\u539f\u578b\u5982\u4e0b：<\/p>\n

#include <sys\/types.h>\u00a0 \u00a0\/* See NOTES*\/
\n#include <sys\/socket.h>
\nint listen(int sockfd, int backlog);<\/p>\n

\u5f53listen()\u51fd\u6570\u6210\u529f\u8fd0\u884c\u65f6，\u8fd4\u56de\u503c\u4e3a0;\u5f53\u8fd0\u884c\u5931\u8d25\u65f6，\u5b83\u7684\u8fd4\u56de\u503c\u4e3a-1，\u5e76\u4e14\u8bbe\u7f6eerrno\u503c：<\/p>\n

\"\"<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u4e86\u89e3listen\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e4b\u524d，\u6211\u4eec\u5148\u4e86\u89e3\u4e0bLinux\u5185\u6838\u534f\u8bae\u6808\u662f\u5982\u4f55\u7ba1\u7406tcp\u8fde\u63a5\u7684： linux\u5185\u6838\u4f1a\u4e3a\u4e00\u4e2atcp\u8fde\u63a5\u7ba1\u7406\u4f7f\u7528 \u4e24\u4e2a\u961f\u5217 ，\u5206\u522b\u662f：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u534a\u8fde\u63a5\u961f\u5217：\u7528\u6765\u4fdd\u5b58SYN_SENT\u548cSYN_RECV\u4e24\u4e2a\u72b6\u6001\u7684\u8fde\u63a5\u3002\u4e5f\u5c31\u662f\u4e09\u6b21\u63e1\u624b\u8fd8\u6ca1\u6709\u5b8c\u6210， \u8fde\u63a5\u8fd8\u6ca1\u5efa\u7acb\u7684\u8fde\u63a5\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5168\u8fde\u63a5\u961f\u5217：\u7528\u6765\u4fdd\u5b58\u4fdd\u5b58ESTABLISHED\u72b6\u6001\u7684\u8fde\u63a5\u3002\u4e09\u6b21\u63e1\u624b\u5df2\u7ecf\u5b8c\u6210\u7684\u8fde\u63a5\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5168\u8fde\u63a5\u961f\u5217\u5b58\u653e\u4e09\u6b21\u63e1\u624b\u6210\u529f\u7684\u8fde\u63a5，\u5982\u679c\u5f53\u670d\u52a1\u5668\u4e0d\u8c03\u7528accept\u51fd\u6570，\u6ca1\u6709\u5c06\u5168\u8fde\u63a5\u961f\u5217\u7684\u8bf7\u6c42 \u62ff\u51fa\u6765，\u5f53\u8be5\u961f\u5217\u6ee1\u7684\u65f6\u5019，\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u5c31\u65e0\u6cd5\u518d\u8fc7\u6765，\u800c\u662f\u5b58\u653e\u5728\u534a\u8fde\u63a5\u961f\u5217\u4e2d，\u6240\u4ee5\u5f53\u5168\u8fde\u63a5 \u6ee1\u65f6，\u670d\u52a1\u5668\u4f1a\u5904\u4e8eSYN_RECV\u72b6\u6001，\u5ba2\u6237\u7aef\u5904\u4e8eSYN_SENT\u72b6\u6001\u3002<\/p>\n

\"\"<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0listen\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570backlog\u6307\u5b9a\u7684\u662f\u5168\u8fde\u63a5\u961f\u5217\u7684\u957f\u5ea6（\u5728\u4e0d\u540c\u7684\u7cfb\u7edf\u4e0a\u6709\u4e0d\u540c\u7684\u5b9e\u73b0，\u5927\u90e8 \u5206Linux\u4e2d\u5b9e\u9645\u7684\u957f\u5ea6\u662fbacklog + 1）\u3002<\/p>\n

Linux\u4e2d\u5168\u8fde\u63a5\u961f\u5217\u7684\u6700\u5927\u957f\u5ea6\u662f128，\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539Linux\u7cfb\u7edf\u53c2\u6570\u5bf9\u957f\u5ea6\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u4ee3\u7801\u76d1\u542c：<\/p>\n

listen(server_fd, 30);<\/p>\n

4\u3001accept() \u51fd\u6570<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0accept() \u51fd\u6570\u4ece\u201c\u5168\u8fde\u63a5\u961f\u5217\u201d\u4e2d\u53d6\u51fa\u4e00\u4e2a\u8282\u70b9，\u7136\u540e\u4e3a\u8be5TCP\u8fde\u63a5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u7528\u4e8e\u4e0e\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1，\u56e0\u6b64\u201c accept\u51fd\u6570\u7684\u8fd4\u56de\u662f\u5728TCP\u4e09\u6b21\u63e1\u624b\u4e4b\u540e\u201c\u3002\u5982\u679c\u201c\u5168\u8fde\u63a5\u961f\u5217\u201d\u4e3a\u7a7a（\u6ca1\u6709\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u670d\u52a1\u7aef），accept\u51fd\u6570\u4f1a\u963b\u585e\u3002<\/p>\n

accept()\u51fd\u6570\u7684\u539f\u578b：<\/p>\n

#include <sys\/types.h>\u00a0 \u00a0\/* See NOTES *\/
\n#include <sys\/socket.h>
\nint accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u901a\u8fc7accept()\u51fd\u6570\u53ef\u4ee5\u5f97\u5230\u6210\u529f\u8fde\u63a5\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u3001\u7aef\u53e3\u548c\u534f\u8bae\u65cf\u7b49\u4fe1\u606f，\u8fd9\u4e2a\u4fe1\u606f\u662f\u901a\u8fc7\u53c2\u6570 addr \u83b7\u5f97\u7684\u3002\u5f53accept()\u51fd\u6570\u8fd4\u56de\u7684\u65f6\u5019，\u4f1a\u5c06\u5ba2\u6237\u7aef\u7684\u4fe1\u606f\u5b58\u50a8\u5728\u53c2\u6570addr\u4e2d\u3002\u53c2\u6570addrlen\u8868\u793a\u7b2c2\u4e2a\u53c2\u6570( addr)\u6240\u6307\u5185\u5bb9\u7684\u957f\u5ea6,\u53ef\u4ee5\u4f7f\u7528sizeof(struct sockaddr_in)\u6765\u83b7\u5f97\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f，\u5728 accept\u4e2d addrlen\u53c2\u6570\u662f\u4e00\u4e2a\u6307\u9488\u800c\u4e0d\u662f\u7ed3\u6784，accept()\u51fd\u6570\u5c06\u8fd9\u4e2a\u6307\u9488\u4f20\u7ed9TCP\/IP\u534f\u8bae\u6808\u3002 accept()\u51fd\u6570\u8fd4\u56de\u8fde\u63a5\u670d\u52a1\u7aef\u7684\u5ba2\u6237\u7aef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5982\u679c\u5931\u8d25\u8fd4\u56de\u503c\u4e3a-1，\u5e76\u4e14\u8bbe\u7f6eerrno\u503c：<\/p>\n

\"\"<\/p>\n

\u4f7f\u7528\u4ee3\u7801\u793a\u4f8b：<\/p>\n

int cli_fd;\/\/\u8868\u793a\u8fde\u63a5\u5230\u7684\u670d\u52a1\u7aef\u7684\u5ba2\u6237\u7aef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\nstruct sockaddr_in cli_addr;
\nsocklen_t len;<\/p>\n

while(1)
\n{
\n len = sizeof(struct sockaddr);
\n cli_fd = accept(server_fd, (struct sockaddr*)&cli_addr, &len);
\n printf("[ip: %s, port: %d] %s\\\\n", inet_ntoa(cli.sin_addr), ntohs(cli.sin_port));
\n}<\/p>\n

5\u3001\u6570\u636e\u7684\u63a5\u6536<\/h4>\n

\u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u6570\u636e\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4e09\u4e2a\u51fd\u6570：<\/p>\n

1）read() \u6570\u636e\u63a5\u6536\u51fd\u6570<\/p>\n

#include <unistd.h>
\nssize_t read(int fd, void *buf, size_t count);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0read()\u51fd\u6570\u4ece\u5957\u63a5\u5b57sockfd\u4e2d\u63a5\u6536\u6570\u636e\u653e\u5230\u7f13\u51b2\u533abuf\u4e2d，buf\u7684\u957f\u5ea6\u4e3alen\u3002 \u7b2c1\u4e2a\u53c2\u6570sockfd\u662f\u5957\u63a5\u53e3\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5b83\u662f\u7531\u7cfb\u7edf\u8c03\u7528socket()\u8fd4\u56de\u7684\u3002\u7b2c2\u4e2a\u53c2\u6570buf\u662f\u4e00\u4e2a\u6307\u9488, \u6307\u5411\u63a5\u6536\u7f51\u7edc\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002\u7b2c3\u4e2a\u53c2\u6570len\u8868\u793a\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5927\u5c0f，\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u3002<\/p>\n

\u4f7f\u7528\u793a\u4f8b\u4ee3\u7801：<\/p>\n

char buf[1024];
\n\/\/\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e
\nmemset(buf, 0, sizeof(buf));
\nint ret;
\nret = read(cli_fd, buf, sizeof(buf)-1); \/\/\u963b\u585e
\n\/\/\u5982\u679c\u5ba2\u6237\u7aef\u4e3b\u52a8\u65ad\u5f00\u4e86\u8fde\u63a5，read\u51fd\u6570\u89e3\u9664\u963b\u585e，\u5e76\u4e14\u8fd4\u56de0
\nif (0 == ret)
\n{
\n close(cli_fd);
\n return NULL;
\n}
\n printf("cli: %d, %s\\\\n", cli_fd, buf)<\/p>\n

2）recv() \u6570\u636e\u63a5\u6536\u51fd\u6570<\/p>\n

recv()\u51fd\u6570\u7528\u4e8e\u63a5\u6536\u6570\u636e，\u51fd\u6570\u539f\u578b\u5982\u4e0b：<\/p>\n

#include <sys\/types.h>
\n#include <sys\/socket.h>
\nssize_t recv(int sockfd, void *buf, size_t len, int flags);<\/p>\n

\u524d\u4e09\u4e2a\u8ddfread\u51fd\u6570\u4e00\u81f4，recv()\u51fd\u6570\u7684\u53c2\u6570flags\u7528\u4e8e\u8bbe\u7f6e\u63a5\u6536\u6570\u636e\u7684\u65b9\u5f0f，\u53ef\u9009\u62e9\u7684\u503c\u53ca\u542b\u4e49\u5728\u4e0b\u8868\u4e2d\u5217\u51fa(flags \u7684\u503c\u53ef\u4ee5\u662f\u8868\u4e2d\u503c\u7684\u6309\u4f4d\u6216\u751f\u6210\u7684\u590d\u5408\u503c)\u3002<\/p>\n

\"\"<\/p>\n

\u4e0a\u8868\u4e2d\u7684\u503c\u7684\u5177\u4f53\u8bf4\u660e：<\/p>\n

MSG_DONTWAIT：\u8fd9\u4e2a\u6807\u5fd7\u5c06\u5355\u4e2aIO\u64cd\u4f5c\u8bbe\u4e3a\u975e\u963b\u585e\u65b9\u5f0f，\u800c\u4e0d\u9700\u8981\u5728\u5957\u63a5\u5b57 \u4e0a\u6253\u5f00\u975e\u963b\u585e\u6807\u5fd7，\u6267\u884cIO\u64cd\u4f5c，\u7136\u540e\u5173\u95ed\u975e\u963b\u585e\u6807\u5fd7\u3002<\/p>\n

MSG_ERRQUEUE：\u8be5\u9519\u8bef\u7684\u4f20\u8f93\u4f9d\u8d56\u4e8e\u6240\u4f7f\u7528\u7684\u534f\u8bae\u3002<\/p>\n

MSG_OOB：\u8fd9\u4e2a\u6807\u5fd7\u53ef\u4ee5\u63a5\u6536\u5e26\u5916\u6570\u636e，\u800c\u4e0d\u662f\u63a5\u6536\u4e00\u822c\u6570\u636e\u3002<\/p>\n

MSG_PEEK：\u8fd9\u4e2a\u6807\u5fd7\u7528\u4e8e\u67e5\u770b\u53ef\u8bfb\u7684\u6570\u636e，\u5728recv()\u51fd\u6570\u6267\u884c\u540e，\u5185\u6838\u4e0d\u4f1a\u5c06\u8fd9\u4e9b\u6570\u636e\u4e22\u5f03\u3002 MSG_TRUNC：\u5728\u63a5\u6536\u6570\u636e\u540e，\u5982\u679c\u7528\u6237\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u4e0d\u8db3\u4ee5\u5b8c\u5168\u590d\u5236\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e，\u5219\u5c06 \u6570\u636e\u622a\u65ad，\u4ec5\u9760\u590d\u5236\u7528\u6237\u7f13\u51b2\u533a\u5927\u5c0f\u7684\u6570\u636e\u3002\u5176\u4ed6\u7684\u6570\u636e\u4f1a\u88ab\u4e22\u5f03\u3002<\/p>\n

MSG_WAITALL：\u8fd9\u4e2a\u6807\u5fd7\u544a\u8bc9\u5185\u6838\u5728\u6ca1\u6709\u8bfb\u5230\u8bf7\u6c42\u7684\u5b57\u8282\u6570\u4e4b\u524d\u4e0d\u4f7f\u8bfb\u64cd\u4f5c\u8fd4\u56de\u3002<\/p>\n

\u793a\u4f8b\u4ee3\u7801：<\/p>\n

char buf[1024];
\n\/\/\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e
\nmemset(buf, 0, sizeof(buf));
\nint ret;
\nret = recv(cli_fd, buf, sizeof(buf)-1,MSG_DONTWAIT);
\nif (0 == ret)
\n{
\n close(cli_fd);
\n return NULL;
\n}
\n printf("cli: %d, %s\\\\n", cli_fd, buf)<\/p>\n

3）recvfrom() \u6570\u636e\u63a5\u6536\u51fd\u6570<\/p>\n

ssize_t recvfrom(int sockfd,\u00a0 void *buf,\u00a0 size_t len,\u00a0 int flags, struct sockaddr *src_addr, socklen_t *addrlen);<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7b2c\u56db\u4e2a\u53c2\u6570\u4fdd\u5b58\u63a5\u6536\u7684\u5ba2\u6237\u7aef\u7684\u76f8\u5173\u4fe1\u606f，\u4f46\u662f\u56e0\u4e3aTCP\u662f\u57fa\u4e8e\u8fde\u63a5\u7684\u4f20\u8f93\u534f\u8bae，\u5728\u8c03\u7528accept\u51fd\u6570 \u65f6\u5c31\u80fd\u591f\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u4fe1\u606f，\u6240\u4ee5recvfrom\u4e00\u822c\u7528\u4e8eudp\u901a\u4fe1\u3002<\/p>\n

6\u3001\u6570\u636e\u7684\u53d1\u9001<\/h4>\n

1) write()\u51fd\u6570\u7528\u4e8e\u53d1\u9001\u6570\u636e，\u51fd\u6570\u539f\u578b\u5982\u4e0b：<\/p>\n

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

\u00a0ssize_t\u00a0 write(int sockfd, const void *buf, size_t len);<\/p>\n

\u53c2\u6570：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sockfd：TCP Socket \u63cf\u8ff0\u7b26\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0buf：\u8981\u53d1\u9001\u7684\u6570\u636e\u7f13\u51b2\u533a\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0count：\u8981\u53d1\u9001\u7684\u5b57\u8282\u6570\u3002<\/p>\n

\u793a\u4f8b\u4ee3\u7801：<\/p>\n

write(cli_fd, "hello", sizeof("hello"));<\/p>\n

2) send()\u51fd\u6570,\u00a0\u539f\u578b\u5982\u4e0b<\/p>\n

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

ssize_t send(int sockfd, const void *buf, size_t len, int flags);<\/p>\n

\u53c2\u6570：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sockfd：TCP Socket \u63cf\u8ff0\u7b26\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0buf：\u8981\u53d1\u9001\u7684\u6570\u636e\u7f13\u51b2\u533a\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0len：\u8981\u53d1\u9001\u7684\u5b57\u8282\u6570\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0flags：\u53ef\u9009\u7684\u6807\u5fd7\u53c2\u6570，\u7528\u4e8e\u63a7\u5236\u53d1\u9001\u884c\u4e3a，\u5982 MSG_DONTWAIT\u3001MSG_NOSIGNAL \u7b49\u3002<\/p>\n

\u793a\u4f8b\u4ee3\u7801：<\/p>\n

send(cli_fd, "hello", sizeof("hello"), MSG_DONTWAIT)<\/p>\n

7\u3001\u4f7f\u7528\u7ebf\u7a0b\u7684\u793a\u4f8bTCP\u670d\u52a1\u5668\u7f16\u7a0b\u4ee3\u7801：<\/h4>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <netinet\/in.h>
\n#include <string.h>
\n#include <unistd.h>
\n#include <pthread.h><\/p>\n

#define dbgout(arg…) \\\\
\n do{ \\\\
\n char b__[1024]; \\\\
\n sprintf(b__, arg);\\\\
\n fprintf(stdout, "[%s,%s,%d] %s", __FILE__, __func__, __LINE__, b__); \\\\
\n } while (0)<\/p>\n

\/\/\u7ebf\u7a0b\u51fd\u6570
\nvoid* func(void* arg)
\n{
\n\/\/\u7ebf\u7a0b\u5206\u79bb
\npthread_detach(pthread_self());
\nint cli_fd = (int)arg;
\nchar buf[1024];
\nwhile (1)
\n{
\n\/\/\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e
\nmemset(buf, 0, sizeof(buf));
\nint ret;
\nret = read(cli_fd, buf, sizeof(buf) – 1);\/\/\u9ed8\u8ba4\u963b\u585e
\n\/\/\u5982\u679c\u5ba2\u6237\u7aef\u4e3b\u52a8\u65ad\u5f00\u4e86\u8fde\u63a5，read\u51fd\u6570\u89e3\u9664\u963b\u585e，\u5e76\u4e14\u8fd4\u56de0
\nif (0 == ret)
\n{
\ndbgout("%d cli closed",cli_fd);
\nclose(cli_fd);
\npthread_exit(0);
\n}
\nif (ret > 0)
\n{
\nprintf("cli_fd: %d, %s\\\\n", cli_fd, buf);
\n}
\nret = send(cli_fd, "ok", strlen("ok"), MSG_DONTWAIT);
\ndbgout("send: %d\\\\n", ret);
\n}
\n}<\/p>\n

int main(int argc, char* argv[])
\n{
\nint server_fd;<\/p>\n

\/\/\u521d\u59cb\u5316socket\u5957\u63a5\u5b57
\nserver_fd = socket(AF_INET, SOCK_STREAM, 0);
\nif (-1 == server_fd)
\n{
\n\/\/perror \u6839\u636eerror\u7684\u503c\u6253\u5370\u51fa\u9519\u7684\u539f\u56e0
\nperror("socket() error");
\nreturn 0;
\n}<\/p>\n

\/\/\u7ed1\u5b9a\u5730\u5740\u548c\u7aef\u53e3
\nstruct sockaddr_in in;
\nin.sin_family = AF_INET;
\n\/\/\u8bbe\u7f6e\u7aef\u53e3\u53f7
\nin.sin_port = htons(8888);
\n\/\/\u8bbe\u7f6e\u5730\u5740
\nin.sin_addr.s_addr = inet_addr("172.26.141.165");<\/p>\n

int ret;
\nret = bind(server_fd, (struct sockaddr*)&in, sizeof(struct sockaddr));
\nif (-1 == ret)
\n{
\n\/\/perror \u6839\u636eerror\u7684\u503c\u6253\u5370\u51fa\u9519\u7684\u539f\u56e0
\nperror("bind() error");
\nreturn 0;
\n}<\/p>\n

\/\/\u76d1\u542c\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42
\nlisten(server_fd, 30);<\/p>\n

int cli_fd;\/\/\u8868\u793a\u8fde\u63a5\u5230\u7684\u670d\u52a1\u7aef\u7684\u5ba2\u6237\u7aef\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\nstruct sockaddr_in cli_addr;
\nsocklen_t len;<\/p>\n

while (1)
\n{
\nlen = sizeof(struct sockaddr);
\ncli_fd = accept(server_fd, (struct sockaddr*)&cli_addr, &len);
\nunsigned short port;
\nchar ip[16] = { 0 };<\/p>\n

\/\/\u5c06\u7f51\u7edc\u5b57\u8282\u5e8f\u7684\u7aef\u53e3\u53f7\u8f6c\u6362\u6210\u4e3b\u673a\u5b57\u8282\u5e8f
\nport = ntohs(cli_addr.sin_port);
\n\/\/\u5c06\u7f51\u7edc\u5b57\u8282\u5e8f\u768432\u4f4dIP\u5730\u5740\u8f6c\u6362\u6210\u4e3b\u673a\u5b57\u8282\u5e8f\u7684\u5b57\u7b26\u4e32
\nstrcpy(ip, inet_ntoa(cli_addr.sin_addr));
\nprintf("new client: %s %d\\\\n", ip, port);<\/p>\n

\/\/\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u53d6\u548c\u5904\u7406\u8fde\u63a5\u5230\u670d\u52a1\u7aef\u7684\u5ba2\u6237\u7aef\u7684\u6570\u636e
\npthread_t t;
\npthread_create(&t, NULL, func, (void*)cli_fd);<\/p>\n

}<\/p>\n

close(cli_fd);
\n close(server_fd);<\/p>\n

return 0;
\n}<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

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