Linux下Socket编程简单例子

最新推荐文章于 2025-02-04 19:38:46 发布

最新推荐文章于 2025-02-04 19:38:46 发布 · 124 阅读

本文介绍了一个简单的服务器程序，使用C语言实现，监听指定端口并接受客户端连接，发送欢迎消息及当前时间。

#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/wait.h> #include <time.h> #define SERVPORT 3333 #define BACKLOG 10 main() { int sockfd,client_fd ,sin_size; struct sockaddr_in my_addr; struct sockaddr_in remote_addr; if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket error"); exit(1); } my_addr.sin_family=AF_INET; my_addr.sin_port=htons(SERVPORT); my_addr.sin_addr.s_addr = INADDR_ANY; bzero(&(my_addr.sin_zero),8); if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) { perror("bind error"); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror("listen error"); exit(1); } while(1) { sin_size = sizeof(struct sockaddr_in); if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) { perror("accept error"); continue; } printf("received a connection from %s\n", inet_ntoa(remote_addr.sin_addr)); if (!fork()) { time_t timep; time (&timep); char temp[100]="Hello,you are connected!the time now is:"; char * t=ctime(&timep); strcat(temp,t); if (send(client_fd, temp, 100, 0) == -1) perror("send error"); close(client_fd); exit(0); } close(client_fd); } }

说明：服务器上要先起这个服务，然后客户端就可以访问了。可以用telnet 你的服务器IP 3333(端口)

修改版：

#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/wait.h> #include <time.h> #define SERVPORT 3333 #define BACKLOG 10 main() { int sockfd,client_fd ,sin_size; struct sockaddr_in my_addr; struct sockaddr_in remote_addr; if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket error"); exit(1); } my_addr.sin_family=AF_INET; my_addr.sin_port=htons(SERVPORT); my_addr.sin_addr.s_addr = INADDR_ANY; bzero(&(my_addr.sin_zero),8); if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) { perror("bind error"); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror("listen error"); exit(1); } while(1) { sin_size = sizeof(struct sockaddr_in); if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) { perror("accept error"); continue; } printf("received a connection from %s\n", inet_ntoa(remote_addr.sin_addr)); if (!fork()) { time_t timep; time (&timep); char temp[1024]="\r\n\r\n<html><head><title>你好</title><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /></head><body>当前系统时间:"; char * t=ctime(&timep); strcat(temp,t); strcat(temp,"</body></html>"); send(client_fd,"HTTP/1.1 200 OK\r\nServer:HWS\r\nContent-Length:1024\r\nContent-Type:text/html;charset=utf-8\r\n", 90, 0); send(client_fd, temp, 1024, 0); close(client_fd); exit(0); } close(client_fd); } }