renice.c revision 87298
1/* 2 * Copyright (c) 1983, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.bin/renice/renice.c 87298 2001-12-03 21:27:45Z dwmalone $"; 46#endif /* not lint */ 47 48#include <sys/types.h> 49#include <sys/time.h> 50#include <sys/resource.h> 51 52#include <err.h> 53#include <errno.h> 54#include <stdio.h> 55#include <stdlib.h> 56#include <string.h> 57#include <pwd.h> 58 59int donice __P((int, int, int)); 60static void usage __P((void)); 61 62/* 63 * Change the priority (nice) of processes 64 * or groups of processes which are already 65 * running. 66 */ 67int 68main(argc, argv) 69 int argc; 70 char **argv; 71{ 72 int which = PRIO_PROCESS; 73 int who = 0, prio, errs = 0; 74 75 argc--, argv++; 76 if (argc < 2) 77 usage(); 78 prio = atoi(*argv); 79 argc--, argv++; 80 if (prio > PRIO_MAX) 81 prio = PRIO_MAX; 82 if (prio < PRIO_MIN) 83 prio = PRIO_MIN; 84 for (; argc > 0; argc--, argv++) { 85 if (strcmp(*argv, "-g") == 0) { 86 which = PRIO_PGRP; 87 continue; 88 } 89 if (strcmp(*argv, "-u") == 0) { 90 which = PRIO_USER; 91 continue; 92 } 93 if (strcmp(*argv, "-p") == 0) { 94 which = PRIO_PROCESS; 95 continue; 96 } 97 if (which == PRIO_USER) { 98 register struct passwd *pwd = getpwnam(*argv); 99 100 if (pwd == NULL) { 101 warnx("%s: unknown user", *argv); 102 continue; 103 } 104 who = pwd->pw_uid; 105 } else { 106 who = atoi(*argv); 107 if (who < 0) { 108 warnx("%s: bad value", *argv); 109 continue; 110 } 111 } 112 errs += donice(which, who, prio); 113 } 114 exit(errs != 0); 115} 116 117static void 118usage() 119{ 120 fprintf(stderr, 121"usage: renice priority [ [ -p ] pids ] [ [ -g ] pgrps ] [ [ -u ] users ]\n"); 122 exit(1); 123} 124 125int 126donice(which, who, prio) 127 int which, who, prio; 128{ 129 int oldprio; 130 131 errno = 0, oldprio = getpriority(which, who); 132 if (oldprio == -1 && errno) { 133 warn("%d: getpriority", who); 134 return (1); 135 } 136 if (setpriority(which, who, prio) < 0) { 137 warn("%d: setpriority", who); 138 return (1); 139 } 140 printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 141 return (0); 142} 143