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 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
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 
28 NoN(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
52 extern int		setpgrp(int, int);
53 #else
54 extern int		setpgrp(void);
55 #endif
56 
57 /*
58  * set process group id
59  */
60 
61 int
62 setpgid(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