Re: Lack of Documentation about SA_RESTART...

[Paolo Ornati <ornati@fastwebnet.it>]

On Tue, 12 Jul 2005 14:16:35 -0400
Theodore Ts'o <tytso@mit.edu> wrote:

> Yes, do look at that.  From the latest 2.6 sources:
> 
> 	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
> 
> 	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
> 		/* Error code is set above */
> 		if (!timeo || !inet_wait_for_connect(sk, timeo))
> 			goto out;
> 
> 		err = sock_intr_errno(timeo);
> 		if (signal_pending(current))
> 			goto out;
> 	}
> 
> If the socket is non-blocking, then we don't call
> inet_wiat_for_connect(), yes.  But sock_intr_errno() will set the
> error code to -EINTR if the socket is set to non-nonblocking (see
> include/net/sock.h), and if a signal is pending, return it.

No.

With non-blocking socket "timeo" is set to 0. So the instruction:

	if (!timeo || !inet_wait_for_connect(sk, timeo))
		goto out;

jumps directly to "out" label. "sock_intr_errno()" isn't called.

-- 
	Paolo Ornati
	Linux 2.6.12.2 on x86_64