xref: /titanic_44/usr/src/lib/libbc/libc/sys/common/setsid.c (revision 3c112a2b34403220c06c3e2fcac403358cfba168)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 1993 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <errno.h>
30 
31 
32 static int setsid_called = 0;
33 static int real_setsid_called=0;
34 static int setsid_val, setsid_errno;
35 
36 
37 /* setpgrp system call number, setsid command code */
38 #define SYS_pgrpsys     39
39 #define SYS_setsid	3
40 
41 int
42 setsid(void)
43 {
44 	if (setsid_called != getpid()) {
45 		setsid_called = getpid();
46 		return (bc_setsid());
47 	} else {
48 		errno = EPERM;
49 		return (-1);
50 	}
51 }
52 
53 
54 
55 int
56 bc_setsid(void)
57 {
58 	if (real_setsid_called != getpid()) {
59 		real_setsid_called = getpid();
60 		setsid_val = _syscall(SYS_pgrpsys, SYS_setsid);
61 		setsid_errno = errno;
62 	}
63 	errno = setsid_errno;
64 	return (setsid_val);
65 }
66