Subject: Re: killpg() gone?
To: Gandhi woulda smacked you <email@example.com>
From: None <firstname.lastname@example.org>
Date: 04/07/1999 16:11:09
In message <Pine.NEB.email@example.com>, Gan
dhi woulda smacked you writes:
>I looked under /usr/include/sys/syscall.h and killpg is nowhere
>to be found, save a 4.3 compatibility reference.
`man 2 kill` says
If pid is zero:
sig is sent to all processes whose group ID is equal to the pro-
cess group ID of the sender, and for which the process has per-
mission; this is a variant of killpg(3).
and killpg.c says
return (kill(-pgid, sig));
`man 2 kill` also says
For compatibility with System V, if the process number is negative but
not -1, the signal is sent to all processes whose process group ID is
equal to the absolute value of the process number. This is a variant of
but since killpg is implemented in terms of this, I think this should become
a first-class feature.
># kill -1 -3003
>-3003: No such process
Hmm. All it does is strtol() and pass it to kill.
>So the shell can't kill process groups, and perl can't kill process
>groups via perl::kill(), and I can't find the syscall number for
>killpg() to have perl call it directly.
There isn't one because it's no longer a syscall; it's a libc compat function,
whose functionality is provided by an extension to kill(2).
Hmm. The source for kill sure looks like it should DTRT with this.