client|server 最简单的聊天

   #include <stdio.h>
   #include <string.h>
   #include <stdlib.h>
   #include <sys/socket.h>
   #include <netinet/in.h>
   int main()
   {
           int sc = ;
           int ret = ;
          int fd = ;
          unsigned char data[] = {};
          sc = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
          if(sc < ){
                  perror("socket");
                  return ;
          }
          struct sockaddr_in gg;
          gg.sin_family = AF_INET;
          gg.sin_port = htons();
          gg.sin_addr.s_addr = inet_addr("192.168.31.238"); //这里写上自己的IP，因为访问者肯定要写主机的IP对吧。

          ret = bind(sc, (struct sockaddr *)&gg, );
          if(ret < ){
                  perror("bind");
                  return ;
          }

          ret = listen(sc, );
          if(ret < ){
                  perror("listen");
                  return ;
          }

          struct sockaddr_in nfd;
          int nfd_len = ;
          fd = accept(sc, (struct sockaddr *)&nfd, &nfd_len);
          if(ret < ){
                  perror("accept");
                  return ;
          }

          ret = recv(fd, data, , );
          if(ret < ){
                  perror("recv");
                  return ;
          }

          printf("client say :  %s\n", data);
          close(sc);
          close(nfd);
  }

   #include <stdio.h>
   #include <stdlib.h>
   #include <sys/socket.h>
   #include <string.h>
   #include <netinet/in.h>

   int main()
   {
                   int ret = ;
                  int fd = ;
                  int sc = ;
                  unsigned char data[] = {};
                  unsigned char arr[] = {};
                  sc = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
                  if(sc < ){
                          perror("socket");
                          return ;
                  }

                  struct sockaddr_in mm;
                  mm.sin_family = AF_INET;
                  mm.sin_port = htons();
                  mm.sin_addr.s_addr = inet_addr("192.168.31.154");;

                  ret = connect(sc, (struct sockaddr *)&mm, );
                  if(ret < ){
                          perror("connect");
                          return ;
                  }
                  struct sockaddr_in gg;
          gg.sin_family = AF_INET;
          gg.sin_port = htons();
          gg.sin_addr.s_addr = inet_addr("192.168.31.238");;

          ret = bind(sc, (struct sockaddr *)&gg, );
          if(ret < ){
                  perror("bind");
                  return ;
          }

          ret = listen(sc, );
          if(ret < ){
                  perror("listen");
                  return ;
          }

           struct sockaddr_in nfd;
          int nfd_len = ;
          fd = accept(sc, (struct sockaddr *)&nfd, &nfd_len);
          if(ret < ){
                  perror("accept");
                  return ;
          }
                  while(){
                  read(, data, );

                  ret = send(sc, data, , );
                  if(ret < ){
                          perror("send");
                          return ;
                  }
                   ret = recv(fd, arr, , );
          if(ret < ){
                  perror("recv");
                  return ;
          }

          printf("client say :  %s\n", arr);

                  }

                  close(sc);

  }