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给你一个简单的示例程序
#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>
main()
{
int sockfd,new_fd;
struct sockaddr_in my_addr;
struct sockaddr_in their_addr;
int sin_size;
//建立TCP套接口
if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1) {
perror("socket"
exit(1);
}
//初始化结构体,并绑定4477端口,服务端将在4477端口上接收连接请求和数据
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(4477);
my_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(my_addr.sin_zero),;
//绑定套接口
if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))==-1)
{
perror("bind"
exit(1);
}
//创建监听套接口
if(listen(sockfd,10)==-1) {
perror("listen"
exit(1);
}
//等待连接
while(1) {
sin_size = sizeof(struct sockaddr_in);
perror("server is run"
//如果建立连接,将产生一个全新的套接字
if((new_fd = accept(sockfd,(struct sockaddr *)&their_addr,&sin_size))==-1)
{
perror("accept"
exit(1);
//生成一个子进程来完成和客户端的会话,父进程继续监听
if(!fork())
{
//读取客户端发来的信息
while(1)
{
int numbytes;
char buff[1024];
memset(buff,0,sizeof(buff));
while(1)
{
if((numbytes = recv(new_fd,buff+strlen(buff),sizeof(buff),0))==-1)
{
perror("recv"
exit(1);
}
printf("pid=%d,buf:%s\n",getpid(),buff);
if((numbytes==0)
break;
}
printf("recv:%s\n",buff);
//将从客户端接收到的信息再发回客户端
char buff2[1024];
memcpy(buff2,buff,10);
if(send(new_fd,buff,strlen(buff),0)==-1)
perror("send"
}
}
close(new_fd);
}
close(sockfd);
} |
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