python - C和Python之间的套接字通信

我只是尝试了一个非常简单的示例，以开始使用套接字在C应用程序和Python之间进行通信。这是非常简单的Python脚本:

import socket

s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect("/tmp/demo_socket")
print "Sending..."
s.send("Hello C from Python!")
data = s.recv(1024)
s.close()
print 'Received', repr(data)

这里是对应的C代码，没有标题:

int main(void)
{
  struct sockaddr_un address;
  int socket_fd, connection_fd;
  socklen_t address_length;
  pid_t child;

  char buffer[256];
  int n;

  socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
  if (socket_fd < 0){
      printf("socket() failed\n");
      return 1;
  }

  unlink("/tmp/demo_socket");
  memset(&address, 0, sizeof(struct sockaddr_un));

  address.sun_family = AF_UNIX;
  snprintf(address.sun_path, UNIX_PATH_MAX, "/tmp/demo_socket");

  if (bind(socket_fd, (struct sockaddr *) &address, sizeof(struct sockaddr_un)) != 0) {
      printf("bind() failed\n");
      return 1;
  }
  if(listen(socket_fd, 5) != 0) {
      printf("listen() failed\n");
      return 1;
  }

  address_length = sizeof(address);
  while((connection_fd = accept(socket_fd,
                   (struct sockaddr *) &address,
                   &address_length)) > -1)
  {
      printf("successfully received data\n");
      bzero(buffer,256);
      n = read(connection_fd,buffer,255);
      if (n < 0) error("ERROR reading from socket");
         printf("Here is the message: %s\n\n", buffer);
      strcpy(buffer, "Hi back from the C world");
      n = write(connection_fd, buffer, strlen(buffer));
      if (n < 0)
         printf("ERROR writing to socket\n");
      break;
  }
  close(socket_fd);
  close(socket_fd);
  return(0);
}

并行运行它们时，输出如下:

 Successfully received data
 Here is the message: Hello C from Python!

 ERROR writing to socket
 close failed in file object destructor:
 Error in sys.excepthook:

 Original exception was:

因此，好消息是，从Python界接收东西可以正常工作，但是尝试写回东西时出现错误，而且看来最后还是出现了异常。有人知道我在这里做错了吗？

编辑:谢谢大家，我做了您建议的更正，消息交换正常，只是C应用程序仍在引起麻烦，我不确定为什么...

close failed in file object destructor:
Error in sys.excepthook:

Original exception was:

最佳答案

您正在尝试写入监听套接字

write(socket_fd, buffer, strlen(buffer));

你应该试试

write(connection_fd, buffer, strlen(buffer));