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+.\"	$OpenBSD: setpgid.2,v 1.17 2014/12/14 07:42:50 schwarze 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: December 14 2014 $
+.Dt SETPGID 2
+.Os
+.Sh NAME
+.Nm setpgid ,
+.Nm setpgrp
+.Nd set process group
+.Sh SYNOPSIS
+.In 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
+.Fa pid
+to the specified
+.Fa pgrp .
+If
+.Fa pid
+is zero, then the call applies to the current process.
+If
+.Fa pgrp
+is zero, the process ID of the specified process is used.
+.Sh RETURN VALUES
+.Rv -std
+.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 pgrp
+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 .