How to detect whether socket is still connected...

tubo posted @ 2014年9月03日 16:15 in 未分类 , 864 阅读

From wget source code…

bool
test_socket_open (int sock)
{
  fd_set check_set;
  struct timeval to;
  int ret = 0;

  /* Check if we still have a valid (non-EOF) connection.  From Andrew
   * Maholski's code in the Unix Socket FAQ.  */

  FD_ZERO (&check_set);
  FD_SET (sock, &check_set);

  /* Wait one microsecond */
  to.tv_sec = 0;
  to.tv_usec = 1;

  ret = select (sock + 1, &check_set, NULL, NULL, &to);
#ifdef WINDOWS
/* gnulib select() converts blocking sockets to nonblocking in windows.
wget uses blocking sockets so we must convert them back to blocking
*/
  set_windows_fd_as_blocking_socket ( sock );
#endif

  if ( !ret )
    /* We got a timeout, it means we're still connected. */
    return true;
  else
    /* Read now would not wait, it means we have either pending data
       or EOF/error. */
    return false;
}

（转载请注明出处，使用许可：署名-非商业性使用-相同方式共享 3.0 中国大陆许可协议。）

[回复]

Alyssa 说:
2023年1月06日 03:18

There are a few ways to detect whether a socket is still connected. One way is to try sending data on the socket. If the socket is no longer connected, this will fail. Another homes for sale Newport Beach way is to try reading data from the socket. If the socket is no longer connected, this will also fail. Another way is to check the socket's status flag. This flag will be set if the socket is no longer connected.

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How to detect whether socket is still connected...