简单的tcp服务端/客户端代码例二

客户端：

                   //客户端连接上服务器之后就会收到服务器的回送信息



#include<stdio.h>
#include<sys/socket.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>


#define SERV_PORT 8888

int main()
{
    int cfd;
    cfd=socket(AF_INET, SOCK_STREAM, 0);

    struct sockaddr_in serv_addr;
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(SERV_PORT);
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    if (connect(cfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
    {
        perror("connect");
        exit(1);
    }
    char sendbuf[BUFSIZ];
         char recvbuf[BUFSIZ];
         while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL){
            send(cfd, sendbuf, strlen(sendbuf),0);
             if(strcmp(sendbuf,"exit
")==0)
                     break;
             recv(cfd, recvbuf, sizeof(recvbuf),0);
             fputs(recvbuf, stdout);

             memset(sendbuf, 0, sizeof(sendbuf));
             memset(recvbuf, 0, sizeof(recvbuf));
         }

         close(cfd);
    return 0;
}

服务端：

          //客户端连接上服务器之后就会收到服务器的回送信息

#include<stdio.h>
#include<sys/socket.h>
#include<unistd.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<ctype.h>
#include<string.h>


#define SERV_PORT 8888

int main()
{
    int lfd = socket(AF_INET, SOCK_STREAM, 0);

    struct sockaddr_in serv_addr, clie_addr;
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(SERV_PORT);
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    if(bind(lfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1);
    {
        perror("bind");
        exit(1);
    }

    if(listen(lfd, 128) == -1)
    {
        perror("listen");
        exit(1);
    }

    socklen_t clie_addr_len=sizeof(clie_addr);
    int cfd=accept(lfd, (struct sockaddr *) &clie_addr,&clie_addr_len);
    if(cfd<0)
    {
        perror("accept");
        exit(1);
    }
    else printf("the server has opend!
");

    char c[BUFSIZ];
    strcpy(c,"I(server) has successfully accepted the client's information!
");
    printf("send succeed
");
    send(cfd,c,sizeof(c),0);
    //printf("send succeed
");
    
    close(cfd);
    close(lfd);
    return 0;
}