Linux下Socket TCP的简单例子

服务器端：#include<sys/socket.h>
#include <unistd.h>// for close function
#include <string.h> // for bzero function
#include<stdio.h>
#include<sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include<netinet/in.h>
#include <stdlib.h>
#define SERV_PORT 5555
#define SERV_IP "xxx.xxx.xxx.xxx"//mx27 board ip
#define BACKLOG 10 //the counts of connect can keep in wait queen
#define MAXBUFSIZE 200
char buf[MAXBUFSIZE]; //receive buf
char str_to_send[200] ="important notice:to cerebrate China log on moon successful on 12nd,Jan,2010. everyone has a day free from work！ ";
int main（int argc, char **argv）
{
int sockfd,sockfd_client;
socklen_t sin_size; // used in accept（）,but i don"t know what it means
printf（"##################################################### "）;
printf（"socket receive text        by pafone 30th,April,2009 "）;
printf（"server ip:%s port:%d         ",SERV_IP,SERV_PORT）;
printf（"##################################################### "）;
struct sockaddr_in my_addr;//local ip info
struct sockaddr_in serv_addr,client_sockaddr; //server ip info
int serverport;
if（argc == 2）
{
  serverport = atoi（argv[1]）;
}
else
{
  serverport = SERV_PORT;
}
if（-1 == （sockfd = socket（AF_INET,SOCK_STREAM,0）））
{
  perror（"error in create socket "）;
  exit（0）;
}
//set the sockaddr_in struct
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons（serverport）;//server listening port
serv_addr.sin_addr.s_addr = INADDR_ANY;//here is the specia in listening tcp connect
bzero（&serv_addr.sin_zero,8）;
//bind , the ip and port information is aready in the sockaddr
if（-1 == bind（sockfd,（struct sockaddr*）&serv_addr,sizeof（struct sockaddr）））
{
  perror（"bind error "）;
  exit（0）;
}
printf（"bind seccessful "）;

if（-1 == listen（sockfd,BACKLOG））
{
  perror（"lisenning"）;
  exit（1）;
}
printf（"the server is listenning... "）;
//accept
printf（"before accept:sockfd_client is %d ",sockfd_client）;
if（-1 == （sockfd_client = accept（sockfd,（struct sockaddr*）&client_sockaddr,&sin_size）））
{
  perror（"accept"）;
  exit（1）;
}
printf（"accept connect. "）;
int recvbytes;//the number of bytes receive from socket
// char buffer[200];
// printf（"sockfd_client is %d ",sockfd_client）;
// recvbytes = recv（sockfd_client,buffer,200,0）;
if（-1 == （recvbytes = recv（sockfd_client,buf,MAXBUFSIZE,0）））//changed here
if（-1 == recvbytes）
{
  perror（"receive"）;
  exit（1）;
}
printf（"%dbytes receive from connect:%s ",recvbytes,buf）;
close（sockfd）;
close（sockfd_client）;
}