socket 映射服务器--（可处理多客户端连接（fork），显示退出信息）

server

#include <stdio.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>

void do_service(int conn)
{
        char recvbuf[];
        while()
        {
                memset(recvbuf,,sizeof(recvbuf));
                int ret = read(conn,recvbuf,sizeof(recvbuf));
                if(ret == )
                {
                        printf("client close\n");
                        break;
                }
                else if (ret == -)
                {
                        printf("read failed \n");
                        exit();
                }
                fputs(recvbuf,stdout);
                write(conn,recvbuf,ret);
        }
}

int main(void)
{
        int listenfd;
        listenfd = socket(PF_INET,SOCK_STREAM,);
        if(listenfd < )
        {
                printf("creat socket failed\n");
                exit();
        }
        struct sockaddr_in servaddr;
        memset(&servaddr,,sizeof(servaddr));
        servaddr.sin_family = AF_INET;
        servaddr.sin_port = htons();
        servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//host any address

        int n=;
        if(setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&n,sizeof(n))<)
        {
                printf("set resueaddr failed\n");
                exit();
        }

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

        return ;
}

client 参考http://www.cnblogs.com/Malphite/p/7529200.html