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Date:	Sun, 9 Feb 2014 20:28:59 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: spawnv() unlocks files in the calling program
Message-ID:	<20140209192859.GG2821@calimero.vinschen.de>
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On Feb  9 13:25, Steven Bardwell wrote:
> I have a simple programs that show the following issue:
>=20
> 1) program locks a file (in my test /tmp/yyy)
> 2) program then calls spawnv() (in my test    "/bin/sh  -c  /bin/touch
> /tmp/xxx").
> 3) after the spawnv(), the file /tmp/yyy is no longer locked.

How do you test that?  You're calling fcntl(F_SETLKW) exactly once at
the start of your test application, but never again later.  We're
talking advisory file locking here, so, where's the next fcntl call
waiting for the lock?

I debugged your test app and the lock still exists after the spawn call.



Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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