1 /* $NetBSD: renice.c,v 1.12 2003/04/18 03:21:01 lukem 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 /*static char sccsid[] = "from: @(#)renice.c 8.1 (Berkeley) 6/9/93";*/ 44 __RCSID("$NetBSD: renice.c,v 1.12 2003/04/18 03:21:01 lukem Exp $"); 45 #endif /* not lint */ 46 47 #include <sys/resource.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <limits.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 57 static int getnum(const char *, const char *, int *); 58 static int donice(int, int, int, int); 59 static void usage(void) __attribute__((__noreturn__)); 60 61 int main(int, char **); 62 63 /* 64 * Change the priority (nice) of processes 65 * or groups of processes which are already 66 * running. 67 */ 68 int 69 main(int argc, char **argv) 70 { 71 int which = PRIO_PROCESS; 72 int who = 0, prio, errs = 0, incr = 0; 73 74 argc--, argv++; 75 if (argc < 2) 76 usage(); 77 if (strcmp(*argv, "-n") == 0) { 78 incr = 1; 79 argc--, argv++; 80 if (argc == 0) 81 usage(); 82 } 83 if (getnum("priority", *argv, &prio)) 84 return 1; 85 argc--, argv++; 86 for (; argc > 0; argc--, argv++) { 87 if (strcmp(*argv, "-g") == 0) { 88 which = PRIO_PGRP; 89 continue; 90 } 91 if (strcmp(*argv, "-u") == 0) { 92 which = PRIO_USER; 93 continue; 94 } 95 if (strcmp(*argv, "-p") == 0) { 96 which = PRIO_PROCESS; 97 continue; 98 } 99 if (which == PRIO_USER) { 100 struct passwd *pwd = getpwnam(*argv); 101 102 if (pwd == NULL) { 103 warnx("%s: unknown user", *argv); 104 continue; 105 } 106 who = pwd->pw_uid; 107 } else { 108 if (getnum("pid", *argv, &who)) 109 continue; 110 if (who < 0) { 111 warnx("%s: bad value", *argv); 112 continue; 113 } 114 } 115 errs += donice(which, who, prio, incr); 116 } 117 exit(errs != 0); 118 } 119 120 static int 121 getnum(const char *com, const char *str, int *val) 122 { 123 long v; 124 char *ep; 125 126 errno = 0; 127 v = strtol(str, &ep, NULL); 128 129 if (*ep) { 130 warnx("Bad %s argument: %s", com, str); 131 return 1; 132 } 133 if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) { 134 warn("Invalid %s argument: %s", com, str); 135 return 1; 136 } 137 138 *val = (int)v; 139 return 0; 140 } 141 142 static int 143 donice(int which, int who, int prio, int incr) 144 { 145 int oldprio; 146 147 errno = 0; 148 if ((oldprio = getpriority(which, who)) == -1 && errno != 0) { 149 warn("%d: getpriority", who); 150 return (1); 151 } 152 153 if (incr) 154 prio = oldprio + prio; 155 156 if (prio > PRIO_MAX) 157 prio = PRIO_MAX; 158 if (prio < PRIO_MIN) 159 prio = PRIO_MIN; 160 161 if (setpriority(which, who, prio) == -1) { 162 warn("%d: setpriority", who); 163 return (1); 164 } 165 printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 166 return (0); 167 } 168 169 static void 170 usage(void) 171 { 172 173 fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ", getprogname()); 174 fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] "); 175 fprintf(stderr, "[-u <user>...]\n"); 176 exit(1); 177 } 178