1 /* $NetBSD: renice.c,v 1.9 2001/02/19 23:03:50 cgd 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 1.9 2001/02/19 23:03:50 cgd Exp $"); 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 #include <sys/time.h> 49 #include <sys/resource.h> 50 51 #include <err.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <errno.h> 57 58 static int getnum __P((const char *, const char *, int *)); 59 static int donice __P((int, int, int, int)); 60 static void usage __P((void)) __attribute__((__noreturn__)); 61 62 int main __P((int, char **)); 63 64 /* 65 * Change the priority (nice) of processes 66 * or groups of processes which are already 67 * running. 68 */ 69 int 70 main(argc, argv) 71 int argc; 72 char **argv; 73 { 74 int which = PRIO_PROCESS; 75 int who = 0, prio, errs = 0, incr = 0; 76 77 argc--, argv++; 78 if (argc < 2) 79 usage(); 80 if (strcmp(*argv, "-n") == 0) { 81 incr = 1; 82 argc--, argv++; 83 if (argc == 0) 84 usage(); 85 } 86 if (getnum("priority", *argv, &prio)) 87 return 1; 88 argc--, argv++; 89 for (; argc > 0; argc--, argv++) { 90 if (strcmp(*argv, "-g") == 0) { 91 which = PRIO_PGRP; 92 continue; 93 } 94 if (strcmp(*argv, "-u") == 0) { 95 which = PRIO_USER; 96 continue; 97 } 98 if (strcmp(*argv, "-p") == 0) { 99 which = PRIO_PROCESS; 100 continue; 101 } 102 if (which == PRIO_USER) { 103 struct passwd *pwd = getpwnam(*argv); 104 105 if (pwd == NULL) { 106 warnx("%s: unknown user", *argv); 107 continue; 108 } 109 who = pwd->pw_uid; 110 } else { 111 if (getnum("pid", *argv, &who)) 112 continue; 113 if (who < 0) { 114 warnx("%s: bad value", *argv); 115 continue; 116 } 117 } 118 errs += donice(which, who, prio, incr); 119 } 120 exit(errs != 0); 121 } 122 123 static int 124 getnum(com, str, val) 125 const char *com, *str; 126 int *val; 127 { 128 long v; 129 char *ep; 130 131 v = strtol(str, &ep, NULL); 132 133 if (*ep) { 134 warnx("Bad %s argument: %s", com, str); 135 return 1; 136 } 137 if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) { 138 warn("Invalid %s argument: %s", com, str); 139 return 1; 140 } 141 142 *val = (int)v; 143 return 0; 144 } 145 146 static int 147 donice(which, who, prio, incr) 148 int which, who, prio, incr; 149 { 150 int oldprio; 151 152 errno = 0; 153 if ((oldprio = getpriority(which, who)) == -1 && errno != 0) { 154 warn("%d: getpriority", who); 155 return (1); 156 } 157 158 if (incr) 159 prio = oldprio + prio; 160 161 if (prio > PRIO_MAX) 162 prio = PRIO_MAX; 163 if (prio < PRIO_MIN) 164 prio = PRIO_MIN; 165 166 if (setpriority(which, who, prio) == -1) { 167 warn("%d: setpriority", who); 168 return (1); 169 } 170 printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 171 return (0); 172 } 173 174 static void 175 usage() 176 { 177 178 (void)fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ", 179 getprogname()); 180 (void)fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] "); 181 (void)fprintf(stderr, "[-u <user>...]\n"); 182 exit(1); 183 } 184