Linux:简单的回射服务器2(多个客户端连接服务器)

/ Linux / 没有评论 / 1666浏览

这个例子只更改了服务端代码。处理多个客户端发送的连接请求

#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#define ERR_EXIT(m)do{perror(m);exit(EXIT_FAILURE);}while(0)

//多个客户端可以连接,将accept弄作一个进程,读取发送数据是一个进程
void do_service(int conn)
{
	char recvbuf[1024];
	while(1)
	{
        memset(recvbuf,0,sizeof(recvbuf));
		int ret = read(conn,recvbuf,sizeof(recvbuf));
		if(ret == 0)//客户端关闭
		{
			printf("client close\n");
			break;
		}
		else if(ret == -1)
		{
			ERR_EXIT("read");
		}
		fputs(recvbuf,stdout);
		int n;
		if((n = write(conn,recvbuf,ret)) < 0)
		{
			fputs("error",stdout);
		}
	}
}

int main(void)
{
	int listenfd;
	if((listenfd = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP)) <0)
		//listenfd = socket(PF_INET,SOCK_STREAM,0);
	{
		ERR_EXIT("socket");
	}
	struct sockaddr_in servaddr;
	memset(&servaddr,0,sizeof(servaddr));
	servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(5188);
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    //servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    //inet_aton("127.0.0.1",&servaddr.sin_addr);
	
	//开启地址重复利用(在TIME_WAIT未消失的情况下,允许服务器重启)
	int on = 1;
	if(setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on)) < 0)
		ERR_EXIT("setsockopt");

	if(bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr)) < 0)
		ERR_EXIT("bind");
    
    if(listen(listenfd,SOMAXCONN) < 0)
		ERR_EXIT("listen");
	
	struct sockaddr_in peeraddr;
	socklen_t peerlen = sizeof(peeraddr);
	
	int conn;
	pid_t pid;
	while(1)
	{
		if((conn = accept(listenfd,(struct sockaddr*)&peeraddr, &peerlen)) < 0)
			ERR_EXIT("accept");
		printf("ip=%s port=%d\n",inet_ntoa(peeraddr.sin_addr),ntohs(peeraddr.sin_port));
		pid = fork();
		if(pid == -1)
			ERR_EXIT("fork");
		if(pid == 0)
		{
			close(listenfd);
			do_service(conn);
			exit(EXIT_SUCCESS);
		}
		else
		{
			close(conn);
		}
	}

    return 0;
}