1 /* $NetBSD: renice.c,v 1.15 2004/01/05 23:23:36 jmmv 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\n\ 35 The Regents of the University of California. All rights reserved.\n"); 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 1.15 2004/01/05 23:23:36 jmmv 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 53 static int getnum(const char *, const char *, int *); 54 static int donice(int, int, int, int); 55 static void usage(void) __attribute__((__noreturn__)); 56 57 int main(int, char **); 58 59 /* 60 * Change the priority (nice) of processes 61 * or groups of processes which are already 62 * running. 63 */ 64 int 65 main(int argc, char **argv) 66 { 67 int which = PRIO_PROCESS; 68 int who = 0, prio, errs = 0, incr = 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 continue; 101 } 102 who = pwd->pw_uid; 103 } else { 104 if (getnum("pid", *argv, &who)) 105 continue; 106 if (who < 0) { 107 warnx("%s: bad value", *argv); 108 continue; 109 } 110 } 111 errs += donice(which, who, prio, incr); 112 } 113 exit(errs != 0); 114 } 115 116 static int 117 getnum(const char *com, const char *str, int *val) 118 { 119 long v; 120 char *ep; 121 122 errno = 0; 123 v = strtol(str, &ep, 0); 124 125 if (*ep) { 126 warnx("Bad %s argument: %s", com, str); 127 return 1; 128 } 129 if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) { 130 warn("Invalid %s argument: %s", com, str); 131 return 1; 132 } 133 134 *val = (int)v; 135 return 0; 136 } 137 138 static int 139 donice(int which, int who, int prio, int incr) 140 { 141 int oldprio; 142 143 errno = 0; 144 if ((oldprio = getpriority(which, who)) == -1 && errno != 0) { 145 warn("%d: getpriority", who); 146 return (1); 147 } 148 149 if (incr) 150 prio = oldprio + prio; 151 152 if (prio > PRIO_MAX) 153 prio = PRIO_MAX; 154 if (prio < PRIO_MIN) 155 prio = PRIO_MIN; 156 157 if (setpriority(which, who, prio) == -1) { 158 warn("%d: setpriority", who); 159 return (1); 160 } 161 printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 162 return (0); 163 } 164 165 static void 166 usage(void) 167 { 168 169 fprintf(stderr, "usage: %s [<priority> | -n <incr>] ", getprogname()); 170 fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] "); 171 fprintf(stderr, "[-u <user>...]\n"); 172 exit(1); 173 } 174