Socket编程：之双机通信

服务端：

 #include<sys/socket.h>
 #include<sys/types.h>
 #include<stdio.h>
 #include<unistd.h>
 #include<stdlib.h>
 #include<string.h>
 #include<netdb.h>
 #include<netinet/in.h>
 #include<arpa/inet.h>
 #include<pthread.h>

 void recv_data(void* fd)
 {
     int sockfd = *((int *)fd);
     char buf[];
     int  renum;
     while()
     {
     bzero(buf, );

     if((renum = recv(sockfd, buf, , )) > )
     {
         printf("recv: %s\n", buf);
     }
     else if(renum == -)
     {
         printf("recv -1");
         exit(-);
     }
     }
 }
 int main(void)
 {
     pthread_t pid;
     int sockfd;
     struct sockaddr_in serveraddr;

     char buf[];
     sockfd = socket(AF_INET, SOCK_STREAM, );
     bzero(&serveraddr, sizeof(struct sockaddr));
     serveraddr.sin_family = AF_INET;
     serveraddr.sin_port = htons();
     serveraddr.sin_addr.s_addr = inet_addr("192.168.0.100");

     if(connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(struct sockaddr)) == -)
     {
         printf("connect failed\n");
         exit(-);
     }
     else
         printf("connect succeed \n");
     pthread_create(&pid, NULL, (void*)recv_data,(void*)&sockfd);
     while()
     {
         memset(buf, , );
         gets(buf);

         send(sockfd, buf, strlen(buf), );
         if(strncmp(buf, "quit", ) == )
         {
             close(sockfd);
             return ;
         }

     }
     close(sockfd);
     return ;
 }

客户端：

 #include<sys/socket.h>
 #include<sys/types.h>
 #include<stdio.h>
 #include<unistd.h>
 #include<stdlib.h>
 #include<string.h>
 #include<netdb.h>
 #include<netinet/in.h>
 #include<arpa/inet.h>
 #include<pthread.h>

 void recv_data(void* fd)
 {
     int sockfd = *((int *)fd);
     char buf[];
     int  renum;
     while()
     {
         bzero(buf, );

         //recv(sockfd, buf, 200, 0);//如果断开 ,recv不再阻塞  返回值 0
         //printf("recv: %s\n", buf);

         if((renum = recv(sockfd, buf, , )) > )
             printf("recv: %s\n", buf);
         else if(renum == -)
         {
             printf("recv -1");
             exit(-);
         }
         else
         {
             close(sockfd);
             exit();

         }

     }

 }
 int main(void)
 {
     pthread_t pid;
     int sockfd, clientfd;
     int sinsize;
     char buf[];
     struct sockaddr_in myaddr, clientaddr;
     sockfd = socket(AF_INET, SOCK_STREAM, );
     if(sockfd == -)
     {
         printf("socket failed\n");
         exit(-);
     }
     printf("%d\n", sockfd);

     bzero(&myaddr, sizeof(struct sockaddr));
     myaddr.sin_family = AF_INET;
     myaddr.sin_port = htons();
     myaddr.sin_addr.s_addr =inet_addr("192.168.0.100");
     sinsize = ;
     setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &sinsize, sizeof(int));
     if(bind(sockfd, (struct sockaddr*)&myaddr, sizeof(struct sockaddr)) == -)
     {
         printf("bind failed\n");
         exit(-);
     }

     if(listen(sockfd, ) == -)
     {
         printf("listen failed\n");
         exit(-);
     }
     sinsize = sizeof(struct sockaddr);
     if((clientfd = accept(sockfd, (struct sockaddr *)&clientaddr, &sinsize)) == -)
     {
         printf("accept failed\n");
         exit(-);
     }
     else
         printf("accept succeed\n");
     pthread_create(&pid, NULL, (void*)recv_data,(void*)&clientfd);
     while()
     {
         memset(buf, , );
         gets(buf);
         if(strncmp(buf, "quit", ) == )
         {
             close(clientfd);
             close(sockfd);
             return ;
         }
         send(clientfd, buf, strlen(buf), );
     }
     sleep();

     close(clientfd);
     close(sockfd);

     return ;
 }