1/* $NetBSD: renice.c,v 1.17 2007/12/15 19:44:52 perry Exp $ */ 2 3/* 4 * Copyright (c) 1983, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#ifndef lint 34__COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\ 35 The Regents of the University of California. All rights reserved."); 36#endif /* not lint */ 37 38#ifndef lint 39/*static char sccsid[] = "from: @(#)renice.c 8.1 (Berkeley) 6/9/93";*/ 40__RCSID("$NetBSD: renice.c,v 1.17 2007/12/15 19:44:52 perry Exp $"); 41#endif /* not lint */ 42 43#include <sys/resource.h> 44 45#include <err.h> 46#include <errno.h> 47#include <limits.h> 48#include <pwd.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#include <sysexits.h> 53 54static int getnum(const char *, const char *, int *); 55static int donice(int, id_t, int, int); 56static void usage(void) __dead; 57 58/* 59 * Change the priority (nice) of processes 60 * or groups of processes which are already 61 * running. 62 */ 63int 64main(int argc, char **argv) 65{ 66 int which = PRIO_PROCESS; 67 int prio, errs = 0, incr = 0; 68 id_t who = 0; 69 70 argc--, argv++; 71 if (argc < 2) 72 usage(); 73 if (strcmp(*argv, "-n") == 0) { 74 incr = 1; 75 argc--, argv++; 76 if (argc == 0) 77 usage(); 78 } 79 if (getnum("priority", *argv, &prio)) 80 return 1; 81 argc--, argv++; 82 for (; argc > 0; argc--, argv++) { 83 if (strcmp(*argv, "-g") == 0) { 84 which = PRIO_PGRP; 85 continue; 86 } 87 if (strcmp(*argv, "-u") == 0) { 88 which = PRIO_USER; 89 continue; 90 } 91 if (strcmp(*argv, "-p") == 0) { 92 which = PRIO_PROCESS; 93 continue; 94 } 95 if (which == PRIO_USER) { 96 struct passwd *pwd = getpwnam(*argv); 97 98 if (pwd == NULL) { 99 warnx("%s: unknown user", *argv); 100 errs++; 101 continue; 102 } 103 who = (id_t)pwd->pw_uid; 104 } else { 105 int twho; 106 if (getnum("pid", *argv, &twho)) { 107 errs++; 108 continue; 109 } 110 if (twho < 0) { 111 warnx("%s: bad value", *argv); 112 errs++; 113 continue; 114 } 115 who = (id_t)twho; 116 } 117 errs += donice(which, who, prio, incr); 118 } 119 return errs == 0 ? EXIT_SUCCESS : EXIT_FAILURE; 120} 121 122static int 123getnum(const char *com, const char *str, int *val) 124{ 125 long v; 126 char *ep; 127 128 errno = 0; 129 v = strtol(str, &ep, 0); 130 131 if (*ep) { 132 warnx("Bad %s argument: %s", com, str); 133 return 1; 134 } 135 if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) { 136 warn("Invalid %s argument: %s", com, str); 137 return 1; 138 } 139 140 *val = (int)v; 141 return 0; 142} 143 144static int 145donice(int which, id_t who, int prio, int incr) 146{ 147 int oldprio; 148 149 errno = 0; 150 if ((oldprio = getpriority(which, who)) == -1 && errno != 0) { 151 warn("%d: getpriority", who); 152 return 1; 153 } 154 155 if (incr) 156 prio = oldprio + prio; 157 158 if (prio > PRIO_MAX) 159 prio = PRIO_MAX; 160 if (prio < PRIO_MIN) 161 prio = PRIO_MIN; 162 163 if (setpriority(which, who, prio) == -1) { 164 warn("%d: setpriority", who); 165 return 1; 166 } 167 (void)printf("%d: old priority %d, new priority %d\n", 168 who, oldprio, prio); 169 return 0; 170} 171 172static void 173usage(void) 174{ 175 176 (void)fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ", 177 getprogname()); 178 (void)fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] "); 179 (void)fprintf(stderr, "[-u <user>...]\n"); 180 exit(1); 181} 182