To: Simon Kirby <sim@netnation.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Strangeness with signals
References: <20050927232034.GC6833@netnation.com>
	<87hdc6htur.fsf@ceramic.fifi.org>
	<20050928034659.GA27953@netnation.com>
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From: Philippe Troin <phil@fifi.org>
Date: 28 Sep 2005 08:30:06 -0700
In-Reply-To: <20050928034659.GA27953@netnation.com>
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Simon Kirby <sim@netnation.com> writes:

> On Tue, Sep 27, 2005 at 06:19:24PM -0700, Philippe Troin wrote:
> 
> > The SIGWINCH and SIGCHLD signals are not generated if their
> > disposition is set to SIG_DFL.  I believe SIGCONT and SIGURG also
> > behave similarly.  If you want to see them from your application, you
> > have to establish a (potentially empty) signal handler.
> 
> Ok, and this is what I did in the example; however, is it expected that
> it does not help to set a handler in sa_handler and call sigaction()?
> In fact, it does not matter what sa_handler is set to (it can still be
> SIG_IGN), but sa_sigaction must point to a valid handler.

As long as sa_handler (or sa_sigaction) is not SIG_DFL (which is NULL
on linux).

Phil.
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