tcp简单服务器

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <stdlib.h>

#define SA struct sockaddr

int main(int argc, const char *argv[])
{
 
	int sockfd=socket(AF_INET,SOCK_STREAM,0);
	if(sockfd==-1)
	{
		perror("fail to socket");
		exit(1);
	
	}

	struct sockaddr_in myaddr,peeraddr;
	myaddr.sin_family=AF_INET;
	myaddr.sin_port=htons(50000);
	myaddr.sin_addr.s_addr=inet_addr("0.0.0.0");

	socklen_t len=sizeof(peeraddr);

	char buf[128];

	//bind 
	int ret_bind=bind(sockfd,(SA*)&myaddr,sizeof(myaddr));
	if(ret_bind<0)
	{
		perror("fail to bind");
		exit(1);
	}

	int ret_lis=listen(sockfd,5);
	if(ret_lis<0)
	{
		perror("fail to listen ");
		exit(1);
	}
	  
	
	while(1)
	{
		bzero(&peeraddr,len);

		int confd=accept(sockfd,(SA*)&peeraddr,&len);
		 
	
		if(confd<0)
		{
			perror("fail to accept");
			exit(1);
		
		}
		printf("%s:%d(fd=%d) is connected\n",inet_ntoa(peeraddr.sin_addr),ntohs(peeraddr.sin_port),confd);


		while(1)
		{

			//recv   read
			int ret_recv=recv(confd,buf,sizeof(buf),0);
			if(ret_recv<0)
			{
				perror("fail to recv");
				exit(1);
			
			}
			else if(ret_recv==0)//瀵规柟閫€鍑� 锛屾垜浠繑鍥炰笂涓€灞傚惊鐜紝缁х画鐩戝惉
			{
				printf("peer is shutdown!\n");
				close(confd);
				break;
			}
			else//鏀跺埌鏁版嵁鍐呭 echo鍥炲幓
			{
				printf("buf:%s\n",buf);

				send(confd,buf,strlen(buf),0);
			
			}
			
			 
		}
	 
	}
	return 0;
}