{"id":19809,"date":"2025-04-19T02:22:36","date_gmt":"2025-04-18T18:22:36","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/19809.html"},"modified":"2025-04-19T02:22:36","modified_gmt":"2025-04-18T18:22:36","slug":"%e7%bd%91%e7%bc%96%ef%bc%88%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/19809.html","title":{"rendered":"\u7f51\u7f16\uff08\u670d\u52a1\u5668\uff09"},"content":{"rendered":"

1.\u00a0 IO\u591a\u8def\u590d\u7528<\/span><\/span><\/h2>\n

1.1poll<\/span><\/span><\/h3>\n

\n

int poll(struct pollfd *fds, nfds_t nfds, int timeout);<\/span>
\n \u53c2\u6570：<\/span>
\n struct pollfd *fds<\/span>
\n \u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u7ec4struct pollfd fds[N];<\/span>
\n nfds:\u4e2a\u6570<\/span>
\n timeout： \u8d85\u65f6\u68c0\u6d4b<\/span>
\n \u6beb\u79d2\u7ea7\u7684：\u5982\u679c\u586b1000，1\u79d2<\/span>
\n \u5982\u679c-1，\u963b\u585e<\/span><\/p>\n

struct pollfd {<\/span>
\n int fd; \/* \u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 *\/<\/span>
\n short events; \/* \u68c0\u6d4b\u4e8b\u4ef6 *\/<\/span>
\n short revents; \/* \u8c03\u7528poll\u51fd\u6570\u8fd4\u56de\u586b\u5145\u7684\u4e8b\u4ef6，poll\u51fd\u6570\u4e00\u65e6\u8fd4\u56de，\u5c06\u5bf9\u5e94\u4e8b\u4ef6\u81ea\u52a8\u586b\u5145\u7ed3\u6784\u4f53\u8fd9\u4e2a\u6210\u5458\u3002\u53ea\u9700\u8981\u5224\u65ad\u8fd9\u4e2a\u6210\u5458\u7684\u503c\u5c31\u53ef\u4ee5\u786e\u5b9a\u662f\u5426\u4ea7\u751f\u4e8b\u4ef6 *\/<\/span>
\n };<\/span>
\n \u4e8b\u4ef6： POLLIN ：\u8bfb\u4e8b\u4ef6<\/span>
\n POLLOUT : \u5199\u4e8b\u4ef6<\/span>
\n POLLERR：\u5f02\u5e38\u4e8b\u4ef6<\/span>
\n<\/span><\/span> <\/p>\n

\n\n\n\n\n\n\n\n\n
\n

\u6d41\u7a0b<\/span><\/span><\/p>\n<\/td>\n

\n

select<\/span><\/span><\/p>\n<\/td>\n

\n

poll<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

1.\u5efa\u7acb\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8868<\/span><\/span><\/p>\n<\/td>\n

\n

fd_set\u7ebf\u6027\u8868<\/span><\/span><\/p>\n<\/td>\n

\n

struct pollfd <\/span>fds[n]<\/span>\u7ed3\u6784\u4f53\u6570\u7ec4<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

2.\u5c06\u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a0\u5230\u8868\u4e2d<\/span><\/span><\/p>\n<\/td>\n

\n

FD_SET(fd,&readfds)<\/span><\/span><\/p>\n<\/td>\n

\n

\u7ed3\u6784\u4f53\u5185\u5bb9\u586b\u5145fds[m].fd= fd<\/span><\/span><\/p>\n

fds[m].events=POLLIN<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

3.<\/span> \u7136\u540e\u8c03\u7528\u4e00\u4e2a\u51fd\u6570\u3002 select <\/span>\/<\/span> poll<\/span><\/span><\/p>\n

4.<\/span> \u5f53\u8fd9\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u5df2\u51c6\u5907\u597d\u8fdb\u884cI<\/span>\/<\/span>O\u64cd\u4f5c\u7684\u65f6\u5019<\/span><\/span><\/p>\n

\u8be5\u51fd\u6570\u624d\u8fd4\u56de<\/span>(<\/span>\u963b\u585e<\/span>)<\/span>\u3002<\/span><\/span><\/p>\n

\n<\/td>\n

\n

select<\/span><\/span><\/p>\n<\/td>\n

\n

poll<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

5.\u5224\u65ad<\/span><\/span><\/p>\n<\/td>\n

\n

FD_ISSET<\/span><\/span><\/p>\n<\/td>\n

\n

revents==POLLIN<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

6.\u76f8\u5173\u64cd\u4f5c<\/span><\/span><\/p>\n<\/td>\n

\n

\n<\/td>\n

\n

\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u7279\u70b9：<\/span><\/span><\/h4>\n

1. \u4f18\u5316\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u7684\u9650\u5236;(\u6839\u636epoll\u51fd\u6570\u7b2c\u4e00\u4e2a\u53c2\u6570\u6765\u5b9a，\u5982\u679c\u76d1\u542c\u7684\u4e8b\u4ef6\u4e3a1\u4e2a，\u5219\u7ed3\u6784\u4f53\u6570\u7ec4\u5143\u7d20\u4e2a\u6570\u4e3a1，\u5982\u679c\u60f3\u76d1\u542c100\u4e2a，\u90a3\u4e48\u8fd9\u4e2a\u7ed3\u6784\u4f53\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570\u5c31\u4e3a100，\u7531\u7a0b\u5e8f\u5458\u81ea\u5df1\u6765\u51b3\u5b9a)<\/span><\/span><\/p>\n

2.\u00a0 poll\u88ab\u5524\u9192\u4e4b\u540e\u9700\u8981\u91cd\u65b0\u8f6e\u8be2\u4e00\u904d\u9a71\u52a8\u7684poll\u51fd\u6570，\u6548\u7387\u6bd4\u8f83\u4f4e<\/span><\/span><\/p>\n

3.\u00a0 poll\u4e0d\u9700\u8981\u91cd\u65b0\u6784\u9020\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868，\u53ea\u9700\u8981\u4ece\u7528\u6237\u7a7a\u95f4\u5411\u5185\u6838\u7a7a\u95f4\u62f7\u8d1d\u4e00\u6b21\u6570\u636e\u5373\u53ef<\/span><\/span><\/p>\n

1.2epoll<\/span><\/span><\/h3>\n

\"\"<\/p>\n

\u7279\u70b9：<\/span><\/span><\/h4>\n

1.\u00a0 \u76d1\u542c\u7684\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ca1\u6709\u4e2a\u6570\u9650\u5236（\u7406\u8bba\u4e0a，\u53d6\u51b3\u4e0e\u4f60\u81ea\u5df1\u7684\u7cfb\u7edf）<\/span><\/span><\/p>\n

2.\u00a0 \u5f02\u6b65I\/O，Epoll\u5f53\u6709\u4e8b\u4ef6\u4ea7\u751f\u88ab\u5524\u9192\u4e4b\u540e，\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3b\u52a8\u8c03\u7528callback(\u56de\u8c03\u51fd\u6570)\u51fd\u6570\u76f4\u63a5\u62ff\u5230\u5524\u9192\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u4e0d\u9700\u8981\u8f6e\u8be2，\u6548\u7387\u9ad8<\/span><\/span><\/p>\n

3.\u00a0 epoll\u4e0d\u9700\u8981\u91cd\u65b0\u6784\u9020\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868，\u53ea\u9700\u8981\u4ece\u7528\u6237\u7a7a\u95f4\u5411\u5185\u6838\u7a7a\u95f4\u62f7\u8d1d\u4e00\u6b21\u6570\u636e\u5373\u53ef.<\/span><\/span><\/p>\n

2.\u00a0 \u670d\u52a1\u5668\u6a21\u578b<\/span><\/span><\/h2>\n

2.1\u5faa\u73af\u670d\u52a1\u5668\u6a21\u578b<\/span><\/span><\/h3>\n

\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u54cd\u5e94\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42<\/span><\/span><\/p>\n

\n

socket();<\/span>
\nbind();<\/span>
\nlisten();<\/span>
\nwhile(1)<\/span>
\n{<\/span>
\n accept();<\/span>
\n while(1)<\/span>
\n {<\/span>
\n \/\/\u5904\u7406<\/span>
\n }<\/span>
\n close();<\/span>
\n}<\/span><\/p>\n

<\/span><\/span> <\/p>\n

2.2\u5e76\u53d1\u670d\u52a1\u5668\u6a21\u578b<\/span><\/span><\/h3>\n

\u540c\u4e00\u65f6\u523b\u80fd\u591f\u54cd\u5e94\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42,\u5e38\u7528\u6a21\u578b：\u591a\u8fdb\u7a0b\u3001\u591a\u7ebf\u7a0b\u3001IO\u591a\u8def\u590d\u7528<\/span><\/span><\/p>\n

\u591a\u8fdb\u7a0b\u6a21\u578b<\/span><\/span><\/h4>\n

\u6bcf\u6765\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5，\u5f00\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u6765\u4e13\u95e8\u5904\u7406\u5ba2\u6237\u7aef\u7684\u6570\u636e，\u5b9e\u73b0\u7b80\u5355，\u4f46\u662f\u7cfb\u7edf\u5f00\u9500\u76f8\u5bf9\u8f83\u5927，\u66f4\u63a8\u8350\u4f7f\u7528\u7ebf\u7a0b\u6a21\u578b\u3002<\/span><\/span><\/p>\n

\n

socket();<\/span>
\nbind();<\/span>
\nlisten();<\/span>
\nwhile(1)<\/span>
\n{<\/span>
\n accept();<\/span>
\n if(fork()==0)<\/span>
\n {<\/span>
\n while(1)<\/span>
\n {<\/span>
\n \/\/\u5904\u7406<\/span>
\n }<\/span> close();<\/span>
\n exit();<\/span>
\n }<\/span>
\n else<\/span>
\n {<\/span>
\n }<\/span>
\n}<\/span>
\n<\/span><\/span> <\/p>\n

\u591a\u8fdb\u7a0b\u7279\u70b9 ：<\/span><\/span><\/span><\/p>\n

1.\u00a0 fork\u4e4b\u524d\u7684\u4ee3\u7801\u88ab\u590d\u5236，\u4f46\u662f\u4e0d\u4f1a\u91cd\u65b0\u6267\u884c\u4e00\u904d；fork\u4e4b\u540e\u7684\u4ee3\u7801\u88ab\u590d\u5236，\u5e76\u4e14\u88ab\u518d\u6b21\u6267\u884c\u4e00\u904d<\/span><\/span><\/p>\n

2.\u00a0 fork\u4e4b\u540e\u4e24\u4e2a\u8fdb\u7a0b\u76f8\u4e92\u72ec\u7acb，\u5b50\u8fdb\u7a0b\u62f7\u8d1d\u4e86\u7236\u8fdb\u7a0b\u7684\u6240\u6709\u4ee3\u7801，\u4f46\u662f\u5185\u5b58\u7a7a\u95f4\u72ec\u7acb<\/span><\/span><\/p>\n

3.\u00a0 fork\u4e4b\u524d\u6253\u5f00\u7684\u6587\u4ef6，fork\u4e4b\u540e\u62ff\u5230\u7684\u662f\u540c\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26，\u64cd\u4f5c\u7684\u662f\u540c\u4e00\u4e2a\u6587\u4ef6\u6307\u9488<\/span><\/span><\/p>\n

\n

\u591a\u8fdb\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668：<\/span><\/span><\/p>\n

\u6ce8\u610f：\u6536\u5230\u5ba2\u6237\u7aef\u6d88\u606f\u540e，\u6253\u5370\u4e0b\u662f\u6765\u81ea\u54ea\u4e2a\u5ba2\u6237\u7aef\u7684\u6570\u636e（\u6765\u7535\u663e\u793a）<\/span><\/span><\/p>\n

\u4f7f\u7528<\/span>SIGCHLD<\/span>\u6765\u5904\u7406\u5b50\u8fdb\u7a0b\u7ed3\u675f\u7684\u4fe1\u53f7，\u4fe1\u53f7\u51fd\u6570\u4e2d\u56de\u6536\u8fdb\u7a0b\u8d44\u6e90\u3002<\/span><\/span><\/p>\n

\n

#include <sys\/types.h> \/* See NOTES *\/<\/span>
\n#include <sys\/socket.h><\/span>
\n#include <sys\/socket.h><\/span>
\n#include <netinet\/in.h><\/span>
\n#include <netinet\/ip.h> \/* superset of previous *\/<\/span>
\n#include <arpa\/inet.h><\/span>
\n#include <stdio.h><\/span>
\n#include <unistd.h><\/span>
\n#include <stdlib.h><\/span>
\n#include <string.h><\/span>
\n#include <signal.h><\/span>
\n#include <sys\/wait.h><\/span><\/p>\n

void handler(int arg)<\/span>
\n{<\/span>
\n waitpid(-1, NULL, WNOHANG);<\/span>
\n}<\/span>
\nint main(int argc, char const *argv[])<\/span>
\n{<\/span>
\n if (argc != 2)<\/span>
\n {<\/span>
\n printf("please input %s ,port!!!\\\\n", argv[0]);<\/span>
\n return -1;<\/span>
\n }<\/span><\/p>\n

\/\/ 1.\u521b\u5efa\u6d41\u5f0f\u5957\u63a5\u5b57<\/span>
\n int sockfd = socket(AF_INET, SOCK_STREAM, 0);<\/span>
\n if (sockfd < 0)<\/span>
\n {<\/span>
\n perror("socket err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n printf("socket success\\\\n");<\/span>
\n \/\/ 2.\u586b\u5145\u7ed3\u6784\u4f53<\/span>
\n struct sockaddr_in addr, caddr;<\/span>
\n addr.sin_family = AF_INET; \/\/ \u534f\u8bae\u65cf<\/span>
\n addr.sin_port = htons(atoi(argv[1])); \/\/ \u7aef\u53e3\u53f7(\u7f51\u7edc\u5b57\u8282\u5e8f)<\/span>
\n \/\/ addr.sin_addr.s_addr = inet_addr(argv[1]); \/\/ ip\u5730\u5740(32\u4f4d\u65e0\u7b26\u53f7\u6574\u6570)<\/span>
\n addr.sin_addr.s_addr = inet_addr("192.168.50.201");<\/span><\/p>\n

socklen_t len = sizeof(caddr);<\/span><\/p>\n

\/\/ 3.\u7ed1\u5b9a<\/span>
\n if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0)<\/span>
\n {<\/span>
\n perror("bind err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n printf("bind success\\\\n");<\/span><\/p>\n

\/\/ 4.\u76d1\u542c<\/span><\/p>\n

if (listen(sockfd, 5) < 0)<\/span>
\n {<\/span>
\n perror("listen err");<\/span>
\n return -1;<\/span>
\n }<\/span><\/p>\n

signal(SIGCHLD, handler);<\/span>
\n while (1)<\/span>
\n {<\/span>
\n \/\/ 5.\u7b49\u5f85\u5ba2\u6237\u7aef\u94fe\u63a5，\u4ea7\u751f\u7528\u4e8e\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
\n int acceptfd = accept(sockfd, (struct sockaddr *)&caddr, &len);<\/span>
\n if (acceptfd < 0)<\/span>
\n {<\/span>
\n perror("accept err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n printf("acceptfd = %d \\\\n", acceptfd);<\/span>
\n \/\/ \u6253\u5370\u5ba2\u6237\u7aefip\u548c\u7aef\u53e3\u53f7<\/span>
\n printf("client ip:%s , port : %d\\\\n", inet_ntoa(caddr.sin_addr), ntohs(caddr.sin_port));<\/span><\/p>\n

\/\/ \u521b\u5efa\u8fdb\u7a0b<\/span>
\n pid_t pid = fork();<\/span>
\n if (pid < 0)<\/span>
\n {<\/span>
\n perror("fork err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n else if (pid == 0) \/\/ \u5b50\u8fdb\u7a0b<\/span>
\n {<\/span>
\n close(sockfd);<\/span>
\n while (1) \/\/ \u8fde\u63a5\u6210\u529f\u540e\u5faa\u73af\u63a5\u6536\u4fe1\u606f<\/span>
\n {<\/span>
\n \/\/ 6.\u63a5\u53d7\u6570\u636e<\/span>
\n char buf[128] = {};<\/span>
\n int ret = recv(acceptfd, buf, 128, 0);<\/span>
\n if (ret < 0)<\/span>
\n {<\/span>
\n perror("recv err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n else if (ret == 0)<\/span>
\n {<\/span>
\n printf("client exit\\\\n");<\/span>
\n break;<\/span>
\n }<\/span>
\n printf("recv :%s\\\\n", buf);<\/span>
\n }<\/span>
\n \/\/ 7.\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
\n close(acceptfd);<\/span>
\n exit(0);<\/span>
\n }<\/span>
\n }<\/span>
\n close(sockfd);<\/span><\/p>\n

return 0;<\/span>
\n}<\/span><\/p>\n

<\/span><\/span> <\/p>\n

\u591a\u7ebf\u7a0b\u6a21\u578b<\/span><\/span><\/h4>\n

\u6bcf\u6765\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5，\u5f00\u4e00\u4e2a\u5b50\u7ebf\u7a0b\u6765\u4e13\u95e8\u5904\u7406\u5ba2\u6237\u7aef\u7684\u6570\u636e，\u5b9e\u73b0\u7b80\u5355，\u5360\u7528\u8d44\u6e90\u8f83\u5c11，\u5c5e\u4e8e\u4f7f\u7528\u6bd4\u8f83\u5e7f\u6cdb\u7684\u6a21\u578b：<\/span><\/span><\/p>\n

\n

socket();<\/span>
\nbind();<\/span>
\nlisten()<\/span>
\nwhile(1)<\/span>
\n{<\/span>
\n accept();<\/span>
\n pthread_create();<\/span><\/p>\n

}<\/span>
\n<\/span><\/span> <\/p>\n

\u591a\u7ebf\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668：<\/span><\/span><\/p>\n

\n

#include <sys\/types.h> \/* See NOTES *\/<\/span>
\n#include <sys\/socket.h><\/span>
\n#include <sys\/socket.h><\/span>
\n#include <netinet\/in.h><\/span>
\n#include <netinet\/ip.h> \/* superset of previous *\/<\/span>
\n#include <arpa\/inet.h><\/span>
\n#include <stdio.h><\/span>
\n#include <unistd.h><\/span>
\n#include <stdlib.h><\/span>
\n#include <string.h><\/span>
\n#include <pthread.h><\/span><\/p>\n

void *mythread(void *arg)<\/span>
\n{<\/span>
\n int acceptfd = *(int *)arg;<\/span>
\n while (1) \/\/ \u8fde\u63a5\u6210\u529f\u540e\u5faa\u73af\u63a5\u6536\u4fe1\u606f<\/span>
\n {<\/span>
\n \/\/ 6.\u63a5\u53d7\u6570\u636e<\/span>
\n char buf[128] = {};<\/span>
\n int ret = recv(acceptfd, buf, 128, 0);<\/span>
\n if (ret < 0)<\/span>
\n {<\/span>
\n perror("recv err");<\/span>
\n return NULL;<\/span>
\n }<\/span>
\n else if (ret == 0)<\/span>
\n {<\/span>
\n printf("client exit\\\\n");<\/span>
\n break;<\/span>
\n }<\/span>
\n printf("recv :%s\\\\n", buf);<\/span>
\n }<\/span>
\n \/\/ 7.\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
\n close(acceptfd);<\/span>
\n pthread_exit(NULL);<\/span>
\n}<\/span>
\nint main(int argc, char const *argv[])<\/span>
\n{<\/span>
\n if (argc != 2)<\/span>
\n {<\/span>
\n printf("please input %s ,port!!!\\\\n", argv[0]);<\/span>
\n return -1;<\/span>
\n }<\/span><\/p>\n

\/\/ 1.\u521b\u5efa\u6d41\u5f0f\u5957\u63a5\u5b57<\/span>
\n int sockfd = socket(AF_INET, SOCK_STREAM, 0);<\/span>
\n if (sockfd < 0)<\/span>
\n {<\/span>
\n perror("socket err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n printf("socket success\\\\n");<\/span>
\n \/\/ 2.\u586b\u5145\u7ed3\u6784\u4f53<\/span>
\n struct sockaddr_in addr, caddr;<\/span>
\n addr.sin_family = AF_INET; \/\/ \u534f\u8bae\u65cf<\/span>
\n addr.sin_port = htons(atoi(argv[1])); \/\/ \u7aef\u53e3\u53f7(\u7f51\u7edc\u5b57\u8282\u5e8f)<\/span>
\n \/\/ addr.sin_addr.s_addr = inet_addr(argv[1]); \/\/ ip\u5730\u5740(32\u4f4d\u65e0\u7b26\u53f7\u6574\u6570)<\/span>
\n addr.sin_addr.s_addr = inet_addr("192.168.50.201");<\/span><\/p>\n

socklen_t len = sizeof(caddr);<\/span><\/p>\n

\/\/ 3.\u7ed1\u5b9a<\/span>
\n if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0)<\/span>
\n {<\/span>
\n perror("bind err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n printf("bind success\\\\n");<\/span><\/p>\n

\/\/ 4.\u76d1\u542c<\/span><\/p>\n

if (listen(sockfd, 5) < 0)<\/span>
\n {<\/span>
\n perror("listen err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n while (1)<\/span>
\n {<\/span>
\n \/\/ 5.\u7b49\u5f85\u5ba2\u6237\u7aef\u94fe\u63a5，\u4ea7\u751f\u7528\u4e8e\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
\n int acceptfd = accept(sockfd, (struct sockaddr *)&caddr, &len);<\/span>
\n if (acceptfd < 0)<\/span>
\n {<\/span>
\n perror("accept err");<\/span>
\n return -1;<\/span>
\n }<\/span>
\n printf("acceptfd = %d \\\\n", acceptfd);<\/span>
\n \/\/ \u6253\u5370\u5ba2\u6237\u7aefip\u548c\u7aef\u53e3\u53f7<\/span>
\n printf("client ip:%s , port : %d\\\\n", inet_ntoa(caddr.sin_addr), ntohs(caddr.sin_port));<\/span><\/p>\n

\/\/ \u521b\u5efa\u7ebf\u7a0b<\/span>
\n pthread_t tid;<\/span>
\n pthread_create(&tid, NULL, mythread, &acceptfd);<\/span>
\n pthread_detach(tid);<\/span>
\n }<\/span>
\n close(sockfd);<\/span><\/p>\n

return 0;<\/span>
\n}<\/span><\/p>\n

<\/span><\/span> <\/p>\n

IO\u591a\u8def\u590d\u7528\u6a21\u578b<\/span><\/span><\/h4>\n

\u501f\u52a9<\/span>select\u3001poll\u3001epoll<\/span>\u673a\u5236，\u5c06\u65b0\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u63cf\u8ff0\u7b26\u589e\u52a0\u5230\u63cf\u8ff0\u7b26\u8868\u4e2d，\u53ea\u9700\u8981\u4e00\u4e2a\u7ebf\u7a0b\u5373\u53ef\u5904\u7406\u6240\u6709\u7684\u5ba2\u6237\u7aef\u8fde\u63a5，\u5728\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d\u5e94\u7528\u5e7f\u6cdb，\u4e0d\u8fc7\u4ee3\u7801\u5199\u8d77\u6765\u7a0d\u663e\u7e41\u7410\u3002<\/span><\/span><\/p>\n

\n

\n

\n

\n

\n","protected":false},"excerpt":{"rendered":"

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