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Message-ID: <20030124023522.GA8876@openwall.com>
Date: Fri, 24 Jan 2003 05:35:22 +0300
From: Solar Designer <solar@...nwall.com>
To: owl-users@...ts.openwall.com
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/system_check.pl
>
> 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
before).
> http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=11778
>
> 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.
--
/sd
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