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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Thu, 8 Jul 2004 10:25:09 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
Subject:	Re: negative error status: gcc vs. cl
In-Reply-To:	<20040708100919.GB32001@cygbert.vinschen.de>
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On Thu, 8 Jul 2004, Corinna Vinschen wrote:

> On Jul  8 11:49, Daniel Lungu wrote:
> > Feel like bash tcsh on Cygwin mess up with negative exit status from a cl
> > compiled .exe
>
> The answer is "don't do that".  Use positive values in the range from
> 0 to 255.  See
> http://www.opengroup.org/onlinepubs/009695399/functions/exit.html
>
> Corinna

Corinna,

Actually, it looks like another buglet in Cygwin.  The code in
spawn_guts() in spawn.cc (line 847 in CVS HEAD) simply binary-ORs the
exitcode value returned by GetExitCodeProcess with the "res" variable.
However, the "res" variable is also used to carry some flags, and a
negative exitcode, being a full DWORD, accidentally sets those, so all
sorts of havoc can potentially occur (and I'm surprised that all that
happens is the wrong exit code).

I could work on a patch, but just saying that the errorcode should be
binary-ANDed with 0xFF before being binary-ORed with "res" should be
faster.

HTH,
	Igor
-- 
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