From: "Michael Kerrisk" <michael.kerrisk@gmx.net>
To: Ulrich Drepper <drepper@redhat.com>, manfred@colorfullife.com
Cc: linux-kernel@vger.kernel.org, tytso@mit.edu, torvalds@osdl.org,
paire@ri.silicomp.fr, eggert@cs.ucla.edu, roland@redhat.com,
rlove@rlove.org, mtk-lkml@gmx.net, mtk-manpages@gmx.net
Subject: Re: Re: Strange Linux behaviour with blocking syscalls and stop signals+SIGCONT
Date: Fri, 07 Jul 2006 06:32:20 +0200 [thread overview]
Message-ID: <20060707043220.186800@gmx.net> (raw)
In-Reply-To: <44AD5CB6.7000607@redhat.com>
Von: Ulrich Drepper <drepper@redhat.com>
> Manfred Spraul wrote:
> > 1) I would go further and try ERESTARTSYS: ERESTARTSYS means that the
> > kernel signal handler honors SA_RESTART
> > 2) At least for the futex functions, it won't be as easy as replacing
> > EINTR wiht ERESTARTSYS: the futex functions receive a timeout a the
> > parameter, with the duration of the wait call as a parameter. You must
> > use ERESTART_RESTARTBLOCK.
>
> Whoa, not so fast. At least the futex syscall but be interruptible by
> signals. It is crucial to return EINTR.
When you say "return" do you mean "in kernel", or "return
to userspace"? My (possibly naive) understanding is that
one could simply s/EINTR/ERESTARTNOHAND/ for FUTEX_WAIT, in
order to achieve the change I want: for userland that
ERESTARTNOHAND would be returned as EINTR if a signal
handler interrupted the FUTEX_WAIT.
Cheers,
Michael
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next prev parent reply other threads:[~2006-07-07 4:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-03 14:46 Strange Linux behaviour with blocking syscalls and stop signals+SIGCONT Michael Kerrisk
2006-07-04 19:02 ` Manfred Spraul
2006-07-06 9:23 ` Michael Kerrisk
2006-07-06 18:42 ` Manfred Spraul
2006-07-06 18:55 ` Ulrich Drepper
2006-07-06 19:02 ` Manfred Spraul
2006-07-06 19:10 ` Ulrich Drepper
2006-07-06 19:18 ` Linus Torvalds
2006-07-06 19:28 ` Manfred Spraul
2006-07-06 19:29 ` Manfred Spraul
2006-07-07 4:57 ` Michael Kerrisk
2006-07-07 5:10 ` Linus Torvalds
2006-07-07 5:12 ` Linus Torvalds
2009-11-07 19:43 ` angelo.borsotti
2006-07-07 4:32 ` Michael Kerrisk [this message]
2006-07-07 4:57 ` Ulrich Drepper
2006-07-07 5:07 ` Michael Kerrisk
2006-07-07 6:20 ` Ulrich Drepper
2006-07-07 7:03 ` Michael Kerrisk
2006-07-07 7:20 ` Arjan van de Ven
2006-07-07 8:02 ` Michael Kerrisk
2006-07-07 9:26 ` Jakub Jelinek
2006-07-07 13:36 ` Ulrich Drepper
2006-07-07 4:28 ` Michael Kerrisk
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