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9bccf70c A	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
2d21ac55 A	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
9bccf70c	54	.Sh DESCRIPTION
39037602	55	.Fn setpgid
9bccf70c A	56	sets the process group of the specified process
	57	.Ar pid
	58	to the specified
2d21ac55	59	.Ar pgid .
9bccf70c A	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.
2d21ac55	67	.Pp
9bccf70c	68	.Sh RETURN VALUES
39037602	69	.Fn setpgid
9bccf70c A	70	returns 0 when the operation was successful.
	71	If the request failed, -1 is returned and the global variable
	72	.Va errno
	73	indicates the reason.
	74	.Sh ERRORS
39037602	75	.Fn setpgid
9bccf70c A	76	will fail and the process group will not be altered if:
9bccf70c A	77	.Bl -tag -width Er
2d21ac55	78	.\" ===========
55e303ae	79	.It Bq Er EACCES
9bccf70c A	80	The value of the
	81	.Fa pid
	82	argument matches the process ID of a child process of the calling process,
	83	and the child process has successfully executed one of the exec functions.
2d21ac55 A	84	.\" ===========
	85	.It Bq Er EINVAL
	86	The value of the
	87	.Fa pgid
	88	argument is less than 0
	89	or is not a value supported by the implementation.
	90	.\" ===========
	91	.It Bq Er EPERM
	92	The process indicated by the
	93	.Fa pid
	94	argument is a session leader.
	95	.\" ===========
9bccf70c A	96	.It Bq Er EPERM
	97	The effective user ID of the requested process is different
	98	from that of the caller and the process is not a descendant
	99	of the calling process.
2d21ac55 A	100	.\" ===========
	101	.It Bq Er EPERM
	102	The value of the
	103	.Fa pgid argument
	104	is valid, but does not match the process ID
	105	of the process indicated by the
	106	.Fa pid
	107	argument and there is no process with a process group ID
	108	that matches the value of the
	109	.Fa pgid
	110	argument in the same session as the calling process.
	111	.\" ===========
9bccf70c A	112	.It Bq Er ESRCH
	113	The value of the
	114	.Fa pid
	115	argument does not match the process ID of the calling process or of a
	116	child process of the calling process.
	117	.El
2d21ac55 A	118	.Sh LEGACY SYNOPSIS
	119	.Fd #include <unistd.h>
	120	.Pp
	121	.Ft int
	122	.br
	123	.Fo setpgrp
	124	.Fa "pid_t pid"
	125	.Fa "pid_t pgid"
	126	.Fc ;
	127	.Pp
	128	The legacy
	129	.Fn setpgrp
	130	function is a clone of the
	131	.Fn setpgid
	132	function, retained for calling convention compatibility
	133	with historical versions of
	134	.Bx .
	135	.Sh COMPATIBILITY
	136	Use of the legacy version of the
	137	.Fn setpgrp
	138	call will cause compiler diagnostics.
	139	Use
	140	.Fn setpgid
	141	instead.
	142	.Pp
	143	Use of private (and conflicting) prototypes for
	144	.Fn setpgrp
	145	will cause compiler diagnostics.
	146	Delete the private prototypes and include
	147	.In unistd.h .
9bccf70c	148	.Sh SEE ALSO
2d21ac55 A	149	.Xr getpgrp 2 ,
2d21ac55 A	150	.Xr compat 5
9bccf70c A	151	.Sh STANDARDS
	152	The
	153	.Fn setpgid
	154	function conforms to
	155	.St -p1003.1-88 .