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	1	.\" $NetBSD: setpgid.2,v 1.8 1995/02/27 12:36:55 cgd Exp $
	2	.\"
	3	.\" Copyright (c) 1980, 1991, 1993
	4	.\" The Regents of the University of California. All rights reserved.
	5	.\"
	6	.\" Redistribution and use in source and binary forms, with or without
	7	.\" modification, are permitted provided that the following conditions
	8	.\" are met:
	9	.\" 1. Redistributions of source code must retain the above copyright
	10	.\" notice, this list of conditions and the following disclaimer.
	11	.\" 2. Redistributions in binary form must reproduce the above copyright
	12	.\" notice, this list of conditions and the following disclaimer in the
	13	.\" documentation and/or other materials provided with the distribution.
	14	.\" 3. All advertising materials mentioning features or use of this software
	15	.\" must display the following acknowledgement:
	16	.\" This product includes software developed by the University of
	17	.\" California, Berkeley and its contributors.
	18	.\" 4. Neither the name of the University nor the names of its contributors
	19	.\" may be used to endorse or promote products derived from this software
	20	.\" without specific prior written permission.
	21	.\"
	22	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	.\" SUCH DAMAGE.
	33	.\"
	34	.\" @(#)setpgid.2 8.1 (Berkeley) 6/4/93
	35	.\"
	36	.Dd June 4, 1993
	37	.Dt SETPGID 2
	38	.Os BSD 4
	39	.Sh NAME
	40	.Nm setpgid ,
	41	.Nm setpgrp
	42	.Nd set process group
	43	.Sh SYNOPSIS
	44	.Fd #include <unistd.h>
	45	.Ft int
	46	.Fo setpgid
	47	.Fa "pid_t pid"
	48	.Fa "pid_t pgid"
	49	.Fc
	50	.Ft pid_t
	51	.Fo setpgrp
	52	.Fa void
	53	.Fc
	54	.Sh DESCRIPTION
	55	.Fn Setpgid
	56	sets the process group of the specified process
	57	.Ar pid
	58	to the specified
	59	.Ar pgid .
	60	If
	61	.Ar pid
	62	is zero, then the call applies to the current process.
	63	.Pp
	64	If the invoker is not the super-user, then the affected process
	65	must have the same effective user-id as the invoker or be a descendant
	66	of the invoking process.
	67	.Pp
	68	If the calling process is not already a session leader,
	69	.Fn setpgrp
	70	sets the process group ID of the calling process
	71	to that of the calling process.
	72	Any new session that this creates will have no controlling terminal.
	73	.Sh RETURN VALUES
	74	.Fn Setpgid
	75	returns 0 when the operation was successful.
	76	If the request failed, -1 is returned and the global variable
	77	.Va errno
	78	indicates the reason.
	79	.Sh ERRORS
	80	.Fn Setpgid
	81	will fail and the process group will not be altered if:
	82	.Bl -tag -width Er
	83	.\" ===========
	84	.It Bq Er EACCES
	85	The value of the
	86	.Fa pid
	87	argument matches the process ID of a child process of the calling process,
	88	and the child process has successfully executed one of the exec functions.
	89	.\" ===========
	90	.It Bq Er EINVAL
	91	The value of the
	92	.Fa pgid
	93	argument is less than 0
	94	or is not a value supported by the implementation.
	95	.\" ===========
	96	.It Bq Er EPERM
	97	The process indicated by the
	98	.Fa pid
	99	argument is a session leader.
	100	.\" ===========
	101	.It Bq Er EPERM
	102	The effective user ID of the requested process is different
	103	from that of the caller and the process is not a descendant
	104	of the calling process.
	105	.\" ===========
	106	.It Bq Er EPERM
	107	The value of the
	108	.Fa pgid argument
	109	is valid, but does not match the process ID
	110	of the process indicated by the
	111	.Fa pid
	112	argument and there is no process with a process group ID
	113	that matches the value of the
	114	.Fa pgid
	115	argument in the same session as the calling process.
	116	.\" ===========
	117	.It Bq Er ESRCH
	118	The value of the
	119	.Fa pid
	120	argument does not match the process ID of the calling process or of a
	121	child process of the calling process.
	122	.El
	123	.Sh LEGACY SYNOPSIS
	124	.Fd #include <unistd.h>
	125	.Pp
	126	.Ft int
	127	.br
	128	.Fo setpgrp
	129	.Fa "pid_t pid"
	130	.Fa "pid_t pgid"
	131	.Fc ;
	132	.Pp
	133	The legacy
	134	.Fn setpgrp
	135	function is a clone of the
	136	.Fn setpgid
	137	function, retained for calling convention compatibility
	138	with historical versions of
	139	.Bx .
	140	.Sh COMPATIBILITY
	141	Use of the legacy version of the
	142	.Fn setpgrp
	143	call will cause compiler diagnostics.
	144	Use
	145	.Fn setpgid
	146	instead.
	147	.Pp
	148	Use of private (and conflicting) prototypes for
	149	.Fn setpgrp
	150	will cause compiler diagnostics.
	151	Delete the private prototypes and include
	152	.In unistd.h .
	153	.Sh SEE ALSO
	154	.Xr getpgrp 2 ,
	155	.Xr compat 5
	156	.Sh STANDARDS
	157	The
	158	.Fn setpgid
	159	function conforms to
	160	.St -p1003.1-88 .