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

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Message-ID: <a36005b50709261003j923835fu621882c54706d476@mail.gmail.com>
Date:	Wed, 26 Sep 2007 10:03:33 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"John Z. Bohach" <jzb2@...orsyst.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: __kernel_vsyscall () hangs in SIGCHLD handler

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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