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 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