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 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 #include "synonyms.h" 43 44 #include <string.h> 45 #include <limits.h> 46 #include <sys/types.h> 47 #include <sys/time.h> 48 #include <sys/resource.h> 49 #include <sys/procset.h> 50 #include <sys/priocntl.h> 51 #include <limits.h> 52 #include <errno.h> 53 #include <priv.h> 54 55 static idtype_t 56 prio_to_idtype(int which) 57 { 58 switch (which) { 59 60 case PRIO_PROCESS: 61 return (P_PID); 62 63 case PRIO_PGRP: 64 return (P_PGID); 65 66 case PRIO_USER: 67 return (P_UID); 68 69 case PRIO_GROUP: 70 return (P_GID); 71 72 case PRIO_SESSION: 73 return (P_SID); 74 75 case PRIO_LWP: 76 return (P_LWPID); 77 78 case PRIO_TASK: 79 return (P_TASKID); 80 81 case PRIO_PROJECT: 82 return (P_PROJID); 83 84 case PRIO_ZONE: 85 return (P_ZONEID); 86 87 case PRIO_CONTRACT: 88 return (P_CTID); 89 90 default: 91 return (-1); 92 } 93 } 94 95 static int 96 old_idtype(int which) 97 { 98 switch (which) { 99 case PRIO_PROCESS: 100 case PRIO_PGRP: 101 case PRIO_USER: 102 return (1); 103 default: 104 return (0); 105 } 106 } 107 108 int 109 getpriority(int which, id_t who) 110 { 111 id_t id; 112 idtype_t idtype; 113 pcnice_t pcnice; 114 115 if ((idtype = prio_to_idtype(which)) == -1) { 116 errno = EINVAL; 117 return (-1); 118 } 119 120 if (who < 0) { 121 if (old_idtype(which)) { 122 errno = EINVAL; 123 return (-1); 124 } else if (who != P_MYID) { 125 errno = EINVAL; 126 return (-1); 127 } 128 } 129 130 /* 131 * The POSIX standard requires that a 0 value for the who argument 132 * should specify the current process, process group, or user. 133 * For all other id types we can treat zero as normal id value. 134 */ 135 if (who == 0 && old_idtype(which)) 136 id = P_MYID; 137 else 138 id = who; 139 140 pcnice.pc_val = 0; 141 pcnice.pc_op = PC_GETNICE; 142 143 if (priocntl(idtype, id, PC_DONICE, &pcnice) == -1) 144 return (-1); 145 else 146 return (pcnice.pc_val); 147 } 148 149 int 150 setpriority(int which, id_t who, int prio) 151 { 152 id_t id; 153 idtype_t idtype; 154 pcnice_t pcnice; 155 int ret; 156 157 if ((idtype = prio_to_idtype(which)) == -1) { 158 errno = EINVAL; 159 return (-1); 160 } 161 162 if (who < 0) { 163 if (old_idtype(which)) { 164 errno = EINVAL; 165 return (-1); 166 } else if (who != P_MYID) { 167 errno = EINVAL; 168 return (-1); 169 } 170 } 171 172 if (who == 0 && old_idtype(which)) 173 id = P_MYID; 174 else 175 id = who; 176 177 if (prio > NZERO - 1) 178 prio = NZERO - 1; 179 else if (prio < -NZERO) 180 prio = -NZERO; 181 182 pcnice.pc_val = prio; 183 pcnice.pc_op = PC_SETNICE; 184 185 ret = priocntl(idtype, id, PC_DONICE, &pcnice); 186 187 if (ret != 0 && errno == EPERM) { 188 pcnice_t gpcnice = { 0, PC_GETNICE }; 189 priv_set_t *pset = NULL; 190 191 /* 192 * The priocntl PC_DONICE subcommand returns EPERM if we lack 193 * sufficient privileges to carry out the operation, but 194 * setpriority(3C) may need to return EACCES. We can't just 195 * change EPERM to EACCES, because there are other conditions 196 * which legitimately cause EPERM (such as an euid/ruid mismatch 197 * between the current process and the target.). 198 * 199 * setpriority(3C) must return EACCES if we lack the privilege 200 * checked for below and we are trying to increase the process 201 * priority (by lowering the numeric value of its priority). 202 */ 203 if (priocntl(idtype, id, PC_DONICE, &gpcnice) == 0 && 204 prio < gpcnice.pc_val) { 205 if ((pset = priv_allocset()) != NULL && 206 getppriv(PRIV_EFFECTIVE, pset) == 0 && 207 !priv_ismember(pset, "proc_priocntl")) 208 errno = EACCES; 209 if (pset != NULL) 210 priv_freeset(pset); 211 } 212 } 213 214 return (ret); 215 } 216