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 1986 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 /* from UCB 4.1 83/05/30 */ 29 30 #include <sys/time.h> 31 #include <sys/resource.h> 32 #include <errno.h> 33 34 /* 35 * Backwards compatible nice. 36 */ 37 int 38 nice(incr) 39 int incr; 40 { 41 register int prio; 42 int serrno; 43 44 /* put in brain-damaged upper range checking */ 45 if ((incr > 40) && (geteuid() != 0)) { 46 errno = EPERM; 47 return (-1); 48 } 49 50 serrno = errno; 51 errno = 0; 52 prio = getpriority(PRIO_PROCESS, 0); 53 if (prio == -1 && errno) 54 return (-1); 55 prio += incr; 56 if (prio < -20) 57 prio = -20; 58 else if (prio > 19) 59 prio = 19; 60 if (setpriority(PRIO_PROCESS, 0, prio) == -1) { 61 /* 62 * 4.3BSD stupidly returns EACCES on an attempt by a 63 * non-super-user process to lower a priority; map 64 * it to EPERM. 65 */ 66 if (errno == EACCES) 67 errno = EPERM; 68 return (-1); 69 } 70 errno = serrno; 71 return (prio); 72 } 73