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.\" Copyright (c) 1980, 1991 Regents of the University of California.
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
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.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
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.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" SUCH DAMAGE.
.\"
.\" $OpenBSD: killpg.3,v 1.11 2007/05/31 19:19:27 jmc Exp $
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt KILLPG 3
.Os
.Sh NAME
.Nm killpg
.Nd send signal to a process group
.Sh SYNOPSIS
.Fd #include <signal.h>
.Ft int
.Fn killpg "pid_t pgrp" "int sig"
.Sh DESCRIPTION
.Fn killpg
sends the signal
.Fa sig
to the process group
.Fa pgrp .
See
.Xr sigaction 2
for a list of signals.
If
.Fa pgrp
is 0,
.Fn killpg
sends the signal to the sending process's process group.
.Pp
The sending process and members of the process group must
have the same effective user ID, or
the sender must be the superuser.
As a single special case the continue signal SIGCONT may be sent
to any process with the same session ID as the caller.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, a value of \-1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn killpg
will fail and no signal will be sent if:
.Bl -tag -width Er
.It Bq Er EINVAL
.Fa sig
is not a valid signal number.
.It Bq Er ESRCH
No process can be found in the process group specified by
.Fa pgrp .
.It Bq Er ESRCH
The process group was given as 0
but the sending process does not have a process group.
.It Bq Er EPERM
The sending process is not the superuser and one or more
of the target processes has an effective user ID different from that
of the sending process.
.El
.Sh SEE ALSO
.Xr getpgrp 2 ,
.Xr kill 2 ,
.Xr sigaction 2
.Sh HISTORY
The
.Fn killpg
function call appeared in
.Bx 4.0 .
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