一段简单的epoll测试例子，编译运行后可以直接用浏览器访问localhost来测试。
1 #include <unistd.h> 2 #include <sys/socket.h> 3 #include <sys/epoll.h> 4 #include <arpa/inet.h> 5 #include <netinet/in.h> 6 #include <fcntl.h> 7 #include <string.h> 8 #include <stdlib.h> 9 #include <stdio.h> 10 #include <stdint.h> 11 #include <errno.h> 12 #include <signal.h> 13 14 char content[] = "<head><head><title>Hello</title></head><body><strong>TEST<strong></body>"; 15 char response[512]; 16 17 int 18 rep_err(char *err) 19 { 20 fprintf(stderr, "%s\n", err); 21 perror("ERROR"); 22 exit(-1); 23 } 24 25 int 26 setnonblock(int fd) 27 { 28 if(fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK) < 0) 29 return -1; 30 return 0; 31 } 32 33 34 int 35 main(int argc, char *argv[]) 36 { 37 struct sockaddr_in servaddr, cliaddr; 38 socklen_t clilen; 39 uint32_t listenfd, connfd, efd, err, n, i; 40 char buffer[1024]; 41 struct epoll_event ev, events[256]; 42 43 signal(SIGPIPE, SIG_IGN); 44 45 sprintf(response, "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nContent-Length: %zd\r\n\r\n%s", strlen(content), content); 46 47 if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) <= 0) 48 rep_err("create socket failed"); 49 50 bzero(&servaddr, sizeof(servaddr)); 51 servaddr.sin_family = AF_INET; 52 servaddr.sin_addr.s_addr = htonl(INADDR_ANY); 53 servaddr.sin_port = htons(80); 54 55 if((err = bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr))) != 0) 56 rep_err("bind host failed"); 57 58 if((err = listen(listenfd, 6)) != 0) 59 rep_err("listen host failed"); 60 61 setnonblock(listenfd); 62 63 efd = epoll_create(256); 64 ev.data.fd = listenfd; 65 ev.events = EPOLLIN | EPOLLET; 66 epoll_ctl(efd, EPOLL_CTL_ADD, listenfd, &ev); 67 68 for(;;) 69 { 70 n = epoll_wait(efd, events, 256, -1); 71 for(i = 0; i < n; ++i) 72 { 73 if(events[i].data.fd == listenfd) 74 { 75 clilen = sizeof(cliaddr); 76 if((connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &clilen)) <= 0) 77 rep_err("accept connect failed"); 78 printf("CONNECT FROM %s , PORT: %d\n", 79 inet_ntop(AF_INET, &cliaddr.sin_addr, buffer, sizeof(buffer)), 80 ntohs(cliaddr.sin_port)); 81 setnonblock(connfd); 82 ev.data.fd = connfd; 83 ev.events = EPOLLIN |EPOLLET; 84 epoll_ctl(efd, EPOLL_CTL_ADD, connfd, &ev); 85 } 86 else 87 { 88 write(events[i].data.fd, response, strlen(response)); 89 write(events[i].data.fd, content, strlen(content)); 90 } 91 } 92 } 93 return 0; 94 }
