linux-kernel - Re: __kernel_vsyscall () hangs in SIGCHLD handler

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Date:	Wed, 26 Sep 2007 11:51:15 -0700
From:	"John Z. Bohach" <jzb2@...orsyst.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Ulrich Drepper" <drepper@...il.com>
Subject: Re: __kernel_vsyscall () hangs in SIGCHLD handler

On Wednesday 26 September 2007 10:03:33 Ulrich Drepper wrote:
> On 9/26/07, John Z. Bohach <jzb2@...orsyst.com> wrote:
> > Is there some reason that syslog() sleeps in __kernel_vsyscall()
> > when invoked from a signal handler?
>
> Only very few functions are allowed to be called from signal
> handlers. This is clearly spelled out in the POSIX spec.  Section XSH
> 2.4.3 lists the allowed functions.  syslog of course is not on it. -
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Thank you for this information...also thanks to Giacomo who answered me 
offline...

--john
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