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>

        int listenfd;
        listenfd 
 
= socket(PF_INET,SOCK_STREAM,0);
        if(listenfd < 0)
        {
                printf("creat socket failed\n");
                exit(1);
        }
        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);//host any address

        if(bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)
        {
                printf("bind fialed\n");
                exit(1);
        }
        if(listen(listenfd,SOMAXCONN)<0)
        {
                printf(
 
"listen failed\n");
                exit(1);
        }
        struct sockaddr_in peeraddr;
        socklen_t peerlen = sizeof(peeraddr);
        int conn;
        if((conn=accept(listenfd,(struct sockaddr*)&peeraddr,&peerlen))<0)
        {
                printf("accept failed\n");
                exit(1);

        }
        printf("ip=%s, port=%d\n",inet_ntoa(peeraddr.sin_addr),ntohs(peeraddr.sin_port
));
        char recvbuf[1024];
        while(1)
        {
                memset(recvbuf,0,sizeof(recvbuf));
                int ret = read(conn,recvbuf,sizeof(recvbuf));
                fputs(recvbuf,stdout);
                write(conn,recvbuf,ret);
        }

        close(conn);
        close(listenfd);
        return 0;
}

client

#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>

int main(void)
{
        int sock;
        sock = socket(PF_INET,SOCK_STREAM,0);
        if(sock < 0)
        {
                printf("creat socket failed\n");
                exit(1);
        }
        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);//host any address
        servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");

        if(connect(sock,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)
        {
                printf("connect failed \n");
                exit(1);
        }

        char sendbuf[1024] = {0};
        char recvbuf[1024] = {0};
        while(fgets(sendbuf,sizeof(sendbuf),stdin) != NULL)
        {
                write(sock,sendbuf,strlen(sendbuf));
                read(sock,recvbuf,sizeof(recvbuf));

                fputs(recvbuf,stdout);
                memset(recvbuf,0,sizeof(recvbuf));
        }

        close(sock);
        return 0;
}

socket 映射服務器程序