1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24#include <ast.h>
25
26#if _lib_setpgid
27
28NoN(setpgid)
29
30#else
31
32#include <error.h>
33
34#ifndef ENOSYS
35#define ENOSYS		EINVAL
36#endif
37
38#if _lib_setpgrp2
39#define setpgrp		setpgrp2
40#else
41#if _lib_BSDsetpgrp
42#define _lib_setpgrp2	1
43#define setpgrp		BSDsetpgrp
44#else
45#if _lib_wait3
46#define	_lib_setpgrp2	1
47#endif
48#endif
49#endif
50
51#if _lib_setpgrp2
52extern int		setpgrp(int, int);
53#else
54extern int		setpgrp(void);
55#endif
56
57/*
58 * set process group id
59 */
60
61int
62setpgid(pid_t pid, pid_t pgid)
63{
64#if _lib_setpgrp2
65	return(setpgrp(pid, pgid));
66#else
67#if _lib_setpgrp
68	int	caller = getpid();
69
70	if ((pid == 0 || pid == caller) && (pgid == 0 || pgid == caller))
71		return(setpgrp());
72	errno = EINVAL;
73#else
74	errno = ENOSYS;
75#endif
76	return(-1);
77#endif
78}
79
80#endif
81