tcp-server.c

uclinux下tcp和udp服务器的建立

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define PORT 3000  /* 定义我们的通信端口*/
#define BACKLOG 10 /*定义处理队列长度*/
main ()
{
 int sockfd, new_fd;
 struct sockaddr_in srvaddr;
 struct sockaddr_in cliaddr;
 int sin_size;
/*建立socket以便通信*/
 if ( (sockfd=socket (AF_INET, SOCK_STREAM, 0)) ==-1)
   {
	perror ("Creat socket error");
	exit (1);
   }
 bzero (&srvaddr, sizeof (srvaddr));
 srvaddr.sin_family=AF_INET;
 srvaddr.sin_port=htons (PORT);
 srvaddr.sin_addr.s_addr=htonl (INADDR_ANY);
/*绑定socket*/
 if (bind (sockfd, (struct sockaddr * ) &srvaddr,sizeof (struct sockaddr)) ==-1)
   {
	perror ("Error when bind");
	exit (1);
   }
/*开始在socket上监听*/
 if (listen (sockfd, BACKLOG) ==-1)
   {
	perror ("lisen error");
	exit (1);
   }
/*循环等待,处理连接请求和发送应答信息*/
 for (;;)
   {
	sin_size=sizeof (struct sockaddr_in);
	if ( (new_fd=accept (sockfd, (struct sockaddr * ) &cliaddr,&sin_size)) ==-1)
	   {
		perror ("Error when accept");
		exit (1);
	   }
	printf ("Server: got connection from %s \n", inet_ntoa (cliaddr.sin_addr));
	if (write (new_fd,"hello,this is server\n", 22) ==-1)
	   perror ("Error when send string");
	close (new_fd);
   }
 close (sockfd);   	
}