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.\" $OpenBSD: setpgid.2,v 1.13 2013/05/08 07:46:26 guenther Exp $
.\" $NetBSD: setpgid.2,v 1.8 1995/02/27 12:36:55 cgd Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" 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.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 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
.\" without specific prior written permission.
.\"
.\" 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
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)setpgid.2 8.1 (Berkeley) 6/4/93
.\"
.Dd $Mdocdate: May 8 2013 $
.Dt SETPGID 2
.Os
.Sh NAME
.Nm setpgid ,
.Nm setpgrp
.Nd set process group
.Sh SYNOPSIS
.Fd #include <unistd.h>
.Ft int
.Fn setpgid "pid_t pid" "pid_t pgrp"
.Ft int
.Fn setpgrp "pid_t pid" "pid_t pgrp"
.Sh DESCRIPTION
.Fn setpgid
sets the process group of the specified process
.Ar pid
to the specified
.Ar pgrp .
If
.Ar pid
is zero, then the call applies to the current process.
If
.Ar pgrp
is zero, the process ID of the specified process is used.
.Sh RETURN VALUES
.Fn setpgid
returns 0 when the operation was successful.
If the request failed, \-1 is returned and the global variable
.Va errno
indicates the reason.
.Sh ERRORS
.Fn setpgid
will fail and the process group will not be altered if:
.Bl -tag -width Er
.It Bq Er EACCES
The value of the
.Fa pid
argument matches the process ID of a child process of the calling process,
and the child process has successfully executed one of the exec functions.
.It Bq Er EINVAL
The value of the
.Fa pgrp
argument is less than zero.
.It Bq Er EPERM
The requested process is a descendant of the calling process, and
is either a session leader or not in the same session as the calling
process.
.It Bq Er EPERM
The value of the
.Fa pgid
argument is neither the PID of the process indicated by the
.Fa pid
argument nor the process group ID of an existing process group in
the same session as the calling process.
.It Bq Er ESRCH
The value of the
.Fa pid
argument does not match the process ID of the calling process or of a
descendant of the calling process.
.El
.Sh SEE ALSO
.Xr getpgrp 2
.Xr setsid 2
.Sh STANDARDS
.Fn setpgrp
is identical to
.Fn setpgid ,
and is retained for calling convention compatibility with historical
versions of
.Bx .
.Pp
The
.Fn setpgid
function conforms to
.St -p1003.1-2008 .
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