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Date: Fri, 24 Jan 2003 05:35:22 +0300
From: Solar Designer <>
Subject: Re: Can't ignore signal CHLD, forcing to default

On Wed, Jan 22, 2003 at 10:03:25AM -0600, Steve Bremer wrote:

Hi Steve,

> 00 01 * * * /sbin/
> Each time it runs, I also receive the message: 
> Can't ignore signal CHLD, forcing to default

Thanks for reminding me of this issue (yes, it's been reported once

> The patch to OpenBSD listed in the post looks like it would apply 
> cleanly to the version of cron provided with Owl.

Yes, -- and it appears to be the correct fix.

> However, after 
> looking at the source code, it looks to me like there is a reason that 
> SIG_IGN was used instead of SIG_DFL when USE_SIGCHLD is defined.

I think the only reason SIG_IGN was used is that Vixie Cron was
written prior to the newer standards which now leave the behavior for
{SIGCHLD, SIG_IGN} only partially specified, and in a new way.  I
don't think the behavior was ever fully specified, but it's natural to
write "SIG_IGN" when you're thinking "ignore".  Now this combination
is just non-portable and should be avoided.

For SIGCHLD, default action (SIG_DFL) is to ignore the signal, so we
may just use that.


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