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mention sig == 0

This commit is contained in:
christos 2014-07-09 16:06:47 +00:00
parent 674ca560ce
commit 4d3bc7269f
1 changed files with 10 additions and 2 deletions
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12
lib/libc/sys/kill.2
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@ -1,4 +1,4 @@
.\" $NetBSD: kill.2,v 1.21 2008/07/13 15:16:26 dholland Exp $
.\" $NetBSD: kill.2,v 1.22 2014/07/09 16:06:47 christos Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@ -29,7 +29,7 @@
.\"
.\" @(#)kill.2 8.3 (Berkeley) 4/19/94
.\"
.Dd April 19, 1994
.Dd July 9, 2014
.Dt KILL 2
.Os
.Sh NAME
@ -94,6 +94,14 @@ 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
.Xr killpg 3 .
.Pp
If
.Fa sig
is equal to
.Dv 0 ,
then no signal is sent to the process ID or process group ID, but error
checking is performed.
This can be used to check if the process ID or process group ID exist.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, a value of \-1 is returned and