server.c

面向连接的Socket实例: 代码实例中的服务器通过socket连接向客户端发送字符串"Hello, you are connected!"。只要在服务 器上运行该服务器软件

/*
*
*	soekct	server
*
*
*/

#include  <stdio.h>
#include  <sys/socket.h>
#include  <netinet/in.h>

#include	<time.h>

#define SERVPORT 20001 /*服务器监听端口号 */ 
#define BACKLOG 10 /* 最大同时连接请求数 */ 

main()
{
	int 	sockfd,client_fd; /*sock_fd：监听socket；client_fd：数据传输socket */
	int	sin_size;
	struct sockaddr_in my_addr; /* 本机地址信息 */
	struct sockaddr_in remote_addr; /* 客户端地址信息 */

	time_t	tt;

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("socket创建出错！"); 
		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出错！");
		exit(1);
	}
	if (listen(sockfd, BACKLOG) == -1) {
		perror("listen出错！");
		exit(1);
	}
	while(1) 
	{
		sin_size = sizeof(struct sockaddr_in);
		if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr,&sin_size)) == -1) 
		{
			perror("accept出错");
			continue;
		}
		printf("received a connection from %s\n", inet_ntoa(remote_addr.sin_addr));
		
		time( &tt );	printf("SERVER receive at  %s\n", ctime( &tt ));

		sleep( 1200 );	

		time( &tt );	printf("SERVER send at  %s\n", ctime( &tt ));

		if (!fork()) 
		{ /* 子进程代码段 */
			if (send(client_fd, "Hello, you are connected!", 26, 0) == -1)
			    	perror("send出错！");
			close(client_fd);
			exit(0);
		}
		close(client_fd);
	}
}