I am a beginner, but I love to see all the knowledge transfer so keep the
moderate to difficult questions coming!
thanks,
Derek B. Smith
OhioHealth IT
UNIX / TSM / EDM Teams
614-566-4145
Errin Larsen <[EMAIL PROTECTED]>
09/24/2004 11:44 AM
Please respond to Errin Larsen
To: Jenda Krynicky <[EMAIL PROTECTED]>
cc: [EMAIL PROTECTED]
Subject: Re: SIGZERO
On Fri, 24 Sep 2004 10:34:50 -0500, Errin Larsen <[EMAIL PROTECTED]>
wrote:
> On Fri, 24 Sep 2004 17:20:44 +0200, Jenda Krynicky <[EMAIL PROTECTED]>
wrote:
> > From: Errin Larsen <[EMAIL PROTECTED]>
<<SNIP>>
>
> how do I wait() or waitpid() on more than one process? don't both of
> those make the wait()ing process sit still and do nothing else until
> it gets a return? I'll read perlipc again (man that's a hard one to
> grok) and see what it says.
>
> --Errin
>
Well, I found the following code snippet in perlipc:
sub REAPER {
my $child;
while( ( $child = waitpid( -1, WNOHANG ) ) > 0 ) {
$Kid_Status{$child} = $?;
}
$SIG{CHLD} = \&REAPER;
}
$SIG{CHLD} = \&REAPER;
This seems to do something similar to what I want, but I'm confused
about exactly what it's doing. what does the '-1' argument to
waitpid() do? What is the 'WNOHANG' flag? Why are we reassigning
'$SIG{CHLD}' to 'REAPER' inside of REAPER (this seems redundant to
me!)
I realize this is getting away from the "beginner" focus of this
mailing list, but I don't currently belong to any other mailing lists.
Thanks for any help you can throw at me.
--Errin
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