From: Daniel Jacobowitz <dan@debian.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: drepper@redhat.com, linuxppc-dev@ozlabs.org,
"Mika Penttilä" <mika.penttila@kolumbus.fi>,
akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 3/3 Generic sys_rt_sigsuspend
Date: Tue, 29 Nov 2005 10:53:46 -0500 [thread overview]
Message-ID: <20051129155346.GA25431@nevyn.them.org> (raw)
In-Reply-To: <1133260923.31573.131.camel@baythorne.infradead.org>
On Tue, Nov 29, 2005 at 10:42:03AM +0000, David Woodhouse wrote:
> I believe not. The previous versions would loop until do_signal()
> returned non-zero; i.e. until a signal was actually delivered.
> By returning -ERESTARTNOHAND we achieve the same effect. If there's a
> signal delivered, that gets magically converted to -EINTR, but if
> there's no signal delivered, the syscall gets restarted.
And, crazy coincidence, I think this will fix the recently reported
ptrace attach bug. Right now if you ptrace a process stuck in
sigsuspend, you can't easily force it to return to userspace.
I'll test that if these patches are merged.
--
Daniel Jacobowitz
CodeSourcery, LLC
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Jacobowitz <dan@debian.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: "Mika Penttilä" <mika.penttila@kolumbus.fi>,
linux-kernel@vger.kernel.org, drepper@redhat.com,
linuxppc-dev@ozlabs.org, akpm@osdl.org
Subject: Re: [PATCH] 3/3 Generic sys_rt_sigsuspend
Date: Tue, 29 Nov 2005 10:53:46 -0500 [thread overview]
Message-ID: <20051129155346.GA25431@nevyn.them.org> (raw)
In-Reply-To: <1133260923.31573.131.camel@baythorne.infradead.org>
On Tue, Nov 29, 2005 at 10:42:03AM +0000, David Woodhouse wrote:
> I believe not. The previous versions would loop until do_signal()
> returned non-zero; i.e. until a signal was actually delivered.
> By returning -ERESTARTNOHAND we achieve the same effect. If there's a
> signal delivered, that gets magically converted to -EINTR, but if
> there's no signal delivered, the syscall gets restarted.
And, crazy coincidence, I think this will fix the recently reported
ptrace attach bug. Right now if you ptrace a process stuck in
sigsuspend, you can't easily force it to return to userspace.
I'll test that if these patches are merged.
--
Daniel Jacobowitz
CodeSourcery, LLC
next prev parent reply other threads:[~2005-11-29 16:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1133225007.31573.86.camel@baythorne.infradead.org>
2005-11-29 0:57 ` [PATCH] 1/3 Add pselect/ppoll() system calls David Woodhouse
2005-11-29 0:57 ` David Woodhouse
2005-11-29 0:57 ` [PATCH] 2/3 Add TIF_RESTORE_SIGMASK support for arch/powerpc David Woodhouse
2005-11-29 0:57 ` David Woodhouse
2005-11-29 0:57 ` [PATCH] 3/3 Generic sys_rt_sigsuspend David Woodhouse
2005-11-29 0:57 ` David Woodhouse
2005-11-29 5:18 ` Mika Penttilä
2005-11-29 5:18 ` Mika Penttilä
2005-11-29 10:42 ` David Woodhouse
2005-11-29 10:42 ` David Woodhouse
2005-11-29 15:53 ` Daniel Jacobowitz [this message]
2005-11-29 15:53 ` Daniel Jacobowitz
2005-11-29 16:09 ` David Woodhouse
2005-11-29 16:09 ` David Woodhouse
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