1 /* $NetBSD: renice.c,v 1.11 2001/09/01 01:59:42 simonb 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 1.11 2001/09/01 01:59:42 simonb 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 v = strtol(str, &ep, NULL); 127 128 if (*ep) { 129 warnx("Bad %s argument: %s", com, str); 130 return 1; 131 } 132 if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) { 133 warn("Invalid %s argument: %s", com, str); 134 return 1; 135 } 136 137 *val = (int)v; 138 return 0; 139 } 140 141 static int 142 donice(int which, int who, int prio, int incr) 143 { 144 int oldprio; 145 146 errno = 0; 147 if ((oldprio = getpriority(which, who)) == -1 && errno != 0) { 148 warn("%d: getpriority", who); 149 return (1); 150 } 151 152 if (incr) 153 prio = oldprio + prio; 154 155 if (prio > PRIO_MAX) 156 prio = PRIO_MAX; 157 if (prio < PRIO_MIN) 158 prio = PRIO_MIN; 159 160 if (setpriority(which, who, prio) == -1) { 161 warn("%d: setpriority", who); 162 return (1); 163 } 164 printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 165 return (0); 166 } 167 168 static void 169 usage(void) 170 { 171 172 fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ", getprogname()); 173 fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] "); 174 fprintf(stderr, "[-u <user>...]\n"); 175 exit(1); 176 } 177