c - c 中的 GPRS socket

Question

我想知道这段代码是否适用于从 Linux 中的 GPRS 套接字接受数据。如果没有，那么如何修改程序以与 GPRS 套接字通信。

服务器.c:

#define sport 5000
#define bufferlength 100

int main(int argc, char **argv[])
{
  struct sockaddr_in serveraddr;
  int sd, acceptsd, rc;
  char buffer[bufferlength];
  if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  {
    perror("error in socket creation\n");
    exit(0);
  }
  else
    printf("socket is created\n");

  serveraddr.sin_family = AF_INET;
  serveraddr.sin_port = htons(sport);
  serveraddr.sin_addr.s_addr = (INADDR_ANY);
  //serveraddr.sin_addr.s_addr=inet_addr("127.0.0.1");
  rc = bind(sd, (struct sockaddr *) &serveraddr, sizeof(serveraddr));
  if (rc < 0)
  {
    perror("srver bind error\n");
    close(sd);
    exit(-1);
  }
  else
    printf("binding done\n");

  rc = listen(sd, 5);
  if (rc < 0)
  {
    perror("listen error");
    close(sd);
    exit(-1);
  }
  else
    printf("listen() is o.k.\n");

  printf("server is ready\n");

  wait(100);
  acceptsd = accept(sd, NULL, NULL);
  if (acceptsd < 0)
  {
    perror("error in accepting\n");
    exit(-1);
    close(sd);
  }
  else
    printf("connection accepted\n");

  printf("server is ready to accept data\n");
  rc = recv(acceptsd, buffer, sizeof(buffer), 0);
  if (rc < 0)
  {
    perror("error in recieving\n");
    close(acceptsd);
    close(sd);
    exit(-1);
  }

  printf("send() is`enter code here` ok\n");

  close(acceptsd);
  close(sd);

  exit(0);
}

Answer 1

如果你愿意

• 添加了缺少的#include语句并且
• 更正了 main() 的签名和
• 在调用 accept() 之前不会等待任何进程结束

代码将接受一个连接的 TCP 客户端并接收至少一个字节，然后结束。