From: David Woodhouse <dwmw2@infradead.org>
To: Michael Kerrisk <mtk-lkml@gmx.net>
Cc: drepper@redhat.com, jakub@redhat.com, torvalds@osdl.org,
linux-kernel@vger.kernel.org, akpm@osdl.org,
michael.kerrisk@gmx.net
Subject: Re: Add pselect, ppoll system calls.
Date: Thu, 25 Aug 2005 01:04:49 +0100 [thread overview]
Message-ID: <1124928289.7316.92.camel@baythorne.infradead.org> (raw)
In-Reply-To: <25911.1123246168@www3.gmx.net>
(Sorry for delayed response)
On Fri, 2005-08-05 at 14:49 +0200, Michael Kerrisk wrote:
> If I change your program to do something like the above, I also
> do not see a message from the handler -- i.e., it is not being
> called, and I'm pretty sure it should be.
Hm, yes. What happens is we come back out of the select() immediately
because of the pending signal, but on the way back to userspace we put
the old signal mask back... so by the time we check for it, there _is_
no (unblocked) signal pending.
If it's mandatory that we actually call the signal handler, then we need
to play tricks like sigsuspend() does to leave the old signal mask on
the stack frame. That's a bit painful atm because do_signal is different
between architectures.
--
dwmw2
next prev parent reply other threads:[~2005-08-25 0:05 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-10 22:58 David Woodhouse
2005-06-12 22:48 ` Alan Cox
2005-06-13 0:26 ` Linus Torvalds
2005-06-13 1:16 ` jnf
2005-06-13 3:26 ` Linus Torvalds
2005-06-13 6:22 ` Ulrich Drepper
2005-06-13 9:16 ` bert hubert
2005-06-13 9:41 ` David Woodhouse
2005-06-13 11:05 ` Christoph Hellwig
2005-06-13 11:14 ` Jakub Jelinek
2005-06-13 11:24 ` David Woodhouse
2005-06-13 15:38 ` Ulrich Drepper
2005-06-13 16:02 ` David Woodhouse
2005-06-13 16:10 ` Ulrich Drepper
2005-06-13 16:29 ` David Woodhouse
2005-06-13 16:31 ` Ulrich Drepper
2005-06-13 21:58 ` David Woodhouse
2005-06-13 22:01 ` Ulrich Drepper
2005-06-13 16:36 ` Jakub Jelinek
2005-06-15 11:36 ` David Woodhouse
2005-08-05 10:42 ` pselect() modifying timeout Michael Kerrisk
2005-08-05 14:50 ` Ulrich Drepper
2005-08-05 20:08 ` Michael Kerrisk
2005-08-08 11:10 ` Alan Cox
2005-08-05 11:58 ` Add pselect, ppoll system calls Michael Kerrisk
2005-08-05 12:49 ` Michael Kerrisk
2005-08-25 0:04 ` David Woodhouse [this message]
2005-08-25 0:34 ` Ulrich Drepper
2005-08-26 6:46 ` Michael Kerrisk
2005-06-13 15:35 ` Ulrich Drepper
2005-06-13 7:23 ` Benjamin Herrenschmidt
2005-06-13 7:29 ` David Woodhouse
2005-06-13 22:56 ` Benjamin Herrenschmidt
2005-06-13 11:15 ` Alan Cox
2005-06-13 11:27 ` David Woodhouse
2005-06-13 15:40 ` Ulrich Drepper
2005-06-13 19:38 Mattias Engdegård
2005-06-13 19:57 ` Chris Friesen
2005-06-13 20:08 ` Mattias Engdegård
2005-06-13 20:23 ` Valdis.Kletnieks
2005-06-14 14:07 ` Mattias Engdegård
2005-06-14 14:16 ` Bernd Petrovitsch
2005-06-14 14:42 ` Mattias Engdegård
2005-06-14 14:54 ` Bernd Petrovitsch
2005-06-14 15:27 ` Valdis.Kletnieks
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