On 03/13/2018 03:09 PM, Ulrich Windl wrote:

Guoqing Jiang <gqji...@suse.com> schrieb am 13.03.2018 um 05:00 in Nachricht
<87a8e0e7-63f3-2329-6598-1fa80b1b1...@suse.com>:

On 03/08/2018 07:24 PM, Ulrich Windl wrote:
Hi!

What surprises me most is that a connect(...O_NONBLOCK) actually blocks:

EINPROGRESS
                The  socket  is  non-blocking  and the connection cannot be
com-
                pleted immediately.

Maybe it is because that the socket is created by sock_create_kern, and
O_NONBLOCK flag is not worked  since __sctp_connect has the following
description.

         /* in-kernel sockets don't generally have a file allocated to them
           * if all they do is call sock_create_kern().
           */
          if (sk->sk_socket->file)
                  f_flags = sk->sk_socket->file->f_flags;

          timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
But O_NONBLOCK is still passed to sock_sndtimeo() (unless the intention was "f_flags 
& ~O_NONBLOCK").


If I am not reading wrong, the O_NONBLOCK doesn't have effective above
since f_flags is still 0.

So, in this case, timeo is set to sk->sk_sndtimeo. In sctp_wait_for_connect
you also can see nonblock is only work when timeo is set to 0.

            if (!*timeo_p)
                        goto do_nonblock;


Thanks,
Guoqing
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