UDP聊天实现（简单版）

两者代码基本一致

关于套接字：

甲方：

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

   int main()
   {
          int ret = ;
          int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
          if(fd < ){
                  perror("socket");
                  exit(EXIT_FAILURE);
          }
          struct sockaddr_in gg;
          gg.sin_family = AF_INET;
          gg.sin_port = htons();
          gg.sin_addr.s_addr = inet_addr("192.168.1.10");
          ret = bind(fd, (struct sockaddr *)&gg, );
          if(ret < ){
                  perror("bind");
                  return ;
          }
          unsigned char buff[] = {};
          unsigned char data[] = {};
          struct sockaddr_in mm;
          mm.sin_family = AF_INET;
          mm.sin_port = htons();
          mm.sin_addr.s_addr = inet_addr("192.168.1.10");
          int mm_len = ;
          while(){
                  fd_set st;
                  FD_ZERO(&st);
                  FD_SET(fd, &st);
                  FD_SET(, &st);
                  ret = select(fd+, &st, , , );
                  if(ret < ){
                          perror("select");
                          return ;
                  }
                  if(FD_ISSET(fd, &st)){
                          memset(buff, , );
                          ret = recvfrom(fd, buff, , , (struct sockaddr *)&mm, &mm_len);
                          if(ret < ){
                                  perror("recvfrom");
                                  exit(EXIT_FAILURE);
                          }
                          printf("gg said :%s", buff);
                  }
                  if(FD_ISSET(, &st)){
                          memset(data, , );
                          read(, data, );
                          ret = sendto(fd, data, strlen(data), , (struct sockaddr *)&mm, );
                           if(ret < ){
                                  perror("sendto");
                                  exit(EXIT_FAILURE);
                          }
                  }

          }
          close(fd);
  }

乙方：

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

   int main()
   {
          int ret = ;
          int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
          if(fd < ){
                  perror("socket");
                  exit(EXIT_FAILURE);
          }
          struct sockaddr_in mm;
          mm.sin_family = AF_INET;
          mm.sin_port = htons();
          mm.sin_addr.s_addr = inet_addr("192.168.1.10");
          ret = bind(fd, (struct sockaddr *)&mm, );
          if(ret < ){
                  perror("bind");
                  return ;
          }
          unsigned char buff[] = {};
          unsigned char data[] = {};
          struct sockaddr_in gg;
          gg.sin_family = AF_INET;
          gg.sin_port = htons();
          gg.sin_addr.s_addr = inet_addr("192.168.1.10");
          int gg_len = ;
          while(){
                  fd_set st;
                  FD_ZERO(&st);
                  FD_SET(fd, &st);
                  FD_SET(, &st);
                  ret = select(fd+, &st, , , );
                  if(ret < ){
                          perror("select");
                          return ;
                  }
                  if(FD_ISSET(fd, &st)){
                          memset(buff, , );
                          ret = recvfrom(fd, buff, , , (struct sockaddr *                                                                    )&gg, &gg_len);
                          if(ret < ){
                                  perror("recvfrom");
                                  exit(EXIT_FAILURE);
                          }
                          printf("mm said :%s", buff);
                  }
                  if(FD_ISSET(, &st)){
                          memset(data, , );
                          read(, data, );
                          ret = sendto(fd, data, strlen(data), , (struct sockaddr *)&gg, );
                           if(ret < ){
                                  perror("sendto");
                                  exit(EXIT_FAILURE);
                          }
                  }
          }
          close(fd);
  }
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