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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29
30 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.78 */
31
32 #include <sys/param.h>
33 #include <sys/types.h>
34 #include <sys/sysmacros.h>
35 #include <sys/systm.h>
36 #include <sys/errno.h>
37 #include <sys/file.h>
38 #include <sys/proc.h>
39 #include <sys/session.h>
40 #include <sys/debug.h>
41
42 /* ARGSUSED */
43 int
setpgrp(int flag,int pid,int pgid)44 setpgrp(int flag, int pid, int pgid)
45 {
46 proc_t *p = curproc;
47 int retval = 0;
48 int sid;
49
50 switch (flag) {
51
52 case 1: /* setpgrp() */
53 mutex_enter(&pidlock);
54 if (p->p_sessp->s_sidp != p->p_pidp && !pgmembers(p->p_pid)) {
55 mutex_exit(&pidlock);
56 sess_create();
57 } else
58 mutex_exit(&pidlock);
59 mutex_enter(&p->p_splock);
60 sid = p->p_sessp->s_sid;
61 mutex_exit(&p->p_splock);
62 return (sid);
63
64 case 3: /* setsid() */
65 mutex_enter(&pidlock);
66 if (p->p_pgidp == p->p_pidp || pgmembers(p->p_pid)) {
67 mutex_exit(&pidlock);
68 return (set_errno(EPERM));
69 }
70 mutex_exit(&pidlock);
71 sess_create();
72 mutex_enter(&p->p_splock);
73 sid = p->p_sessp->s_sid;
74 mutex_exit(&p->p_splock);
75 return (sid);
76
77 case 5: /* setpgid() */
78 {
79 mutex_enter(&pidlock);
80 if (pid == 0)
81 pid = p->p_pid;
82 else if (pid < 0 || pid >= maxpid) {
83 mutex_exit(&pidlock);
84 return (set_errno(EINVAL));
85 } else if (pid != p->p_pid) {
86 for (p = p->p_child; /* empty */; p = p->p_sibling) {
87 if (p == NULL) {
88 mutex_exit(&pidlock);
89 return (set_errno(ESRCH));
90 }
91 if (p->p_pid == pid)
92 break;
93 }
94 if (p->p_flag & SEXECED) {
95 mutex_exit(&pidlock);
96 return (set_errno(EACCES));
97 }
98 if (p->p_sessp != ttoproc(curthread)->p_sessp) {
99 mutex_exit(&pidlock);
100 return (set_errno(EPERM));
101 }
102 }
103
104 if (p->p_sessp->s_sid == pid) {
105 mutex_exit(&pidlock);
106 return (set_errno(EPERM));
107 }
108
109 if (pgid == 0)
110 pgid = p->p_pid;
111 else if (pgid < 0 || pgid >= maxpid) {
112 mutex_exit(&pidlock);
113 return (set_errno(EINVAL));
114 }
115
116 if (p->p_pgrp == pgid) {
117 mutex_exit(&pidlock);
118 break;
119 } else if (p->p_pid == pgid) {
120 /*
121 * We need to protect p_pgidp with p_lock because
122 * /proc looks at it while holding only p_lock.
123 */
124 mutex_enter(&p->p_lock);
125 pgexit(p);
126 pgjoin(p, p->p_pidp);
127 mutex_exit(&p->p_lock);
128 } else {
129 register proc_t *q;
130
131 if ((q = pgfind(pgid)) == NULL ||
132 q->p_sessp != p->p_sessp) {
133 mutex_exit(&pidlock);
134 return (set_errno(EPERM));
135 }
136 /*
137 * See comment above about p_lock and /proc
138 */
139 mutex_enter(&p->p_lock);
140 pgexit(p);
141 pgjoin(p, q->p_pgidp);
142 mutex_exit(&p->p_lock);
143 }
144 mutex_exit(&pidlock);
145 break;
146 }
147
148 case 0: /* getpgrp() */
149 mutex_enter(&pidlock);
150 retval = p->p_pgrp;
151 mutex_exit(&pidlock);
152 break;
153
154 case 2: /* getsid() */
155 case 4: /* getpgid() */
156 if (pid < 0 || pid >= maxpid) {
157 return (set_errno(EINVAL));
158 }
159 mutex_enter(&pidlock);
160 if (pid != 0 && p->p_pid != pid &&
161 ((p = prfind(pid)) == NULL || p->p_stat == SIDL)) {
162 mutex_exit(&pidlock);
163 return (set_errno(ESRCH));
164 }
165 if (flag == 2)
166 retval = p->p_sessp->s_sid;
167 else
168 retval = p->p_pgrp;
169 mutex_exit(&pidlock);
170 break;
171
172 }
173 return (retval);
174 }
175