renice.c revision 94355
11590Srgrimes/* 21590Srgrimes * Copyright (c) 1983, 1989, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 321590Srgrimes */ 331590Srgrimes 341590Srgrimes#ifndef lint 3527917Scharnierstatic const char copyright[] = 361590Srgrimes"@(#) Copyright (c) 1983, 1989, 1993\n\ 371590Srgrimes The Regents of the University of California. All rights reserved.\n"; 381590Srgrimes#endif /* not lint */ 391590Srgrimes 401590Srgrimes#ifndef lint 4127917Scharnier#if 0 421590Srgrimesstatic char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93"; 4327917Scharnier#endif 4427917Scharnierstatic const char rcsid[] = 4550477Speter "$FreeBSD: head/usr.bin/renice/renice.c 94355 2002-04-10 11:09:46Z maxim $"; 461590Srgrimes#endif /* not lint */ 471590Srgrimes 481590Srgrimes#include <sys/types.h> 491590Srgrimes#include <sys/time.h> 501590Srgrimes#include <sys/resource.h> 511590Srgrimes 5227917Scharnier#include <err.h> 5359217Simp#include <errno.h> 5494355Smaxim#include <limits.h> 5594354Smaxim#include <pwd.h> 561590Srgrimes#include <stdio.h> 5727917Scharnier#include <stdlib.h> 5878718Sdd#include <string.h> 591590Srgrimes 6094355Smaximstatic int donice(int, int, int, int); 6194355Smaximstatic int getnum(const char *, const char *, int *); 6294354Smaximstatic void usage(void); 6327917Scharnier 641590Srgrimes/* 651590Srgrimes * Change the priority (nice) of processes 661590Srgrimes * or groups of processes which are already 671590Srgrimes * running. 681590Srgrimes */ 6927917Scharnierint 7094354Smaximmain(int argc, char *argv[]) 711590Srgrimes{ 7294354Smaxim struct passwd *pwd; 7394355Smaxim int errs, incr, prio, which, who; 741590Srgrimes 7594354Smaxim errs = 0; 7694355Smaxim incr = 0; 7794354Smaxim which = PRIO_PROCESS; 7894354Smaxim who = 0; 791590Srgrimes argc--, argv++; 8027917Scharnier if (argc < 2) 8127917Scharnier usage(); 8294355Smaxim if (strcmp(*argv, "-n") == 0) { 8394355Smaxim incr = 1; 8494355Smaxim argc--, argv++; 8594355Smaxim if (argc == 0) 8694355Smaxim usage(); 8794355Smaxim } 8894355Smaxim if (getnum("priority", *argv, &prio)) 8994355Smaxim return (1); 901590Srgrimes prio = atoi(*argv); 911590Srgrimes argc--, argv++; 921590Srgrimes if (prio > PRIO_MAX) 931590Srgrimes prio = PRIO_MAX; 941590Srgrimes if (prio < PRIO_MIN) 951590Srgrimes prio = PRIO_MIN; 961590Srgrimes for (; argc > 0; argc--, argv++) { 971590Srgrimes if (strcmp(*argv, "-g") == 0) { 981590Srgrimes which = PRIO_PGRP; 991590Srgrimes continue; 1001590Srgrimes } 1011590Srgrimes if (strcmp(*argv, "-u") == 0) { 1021590Srgrimes which = PRIO_USER; 1031590Srgrimes continue; 1041590Srgrimes } 1051590Srgrimes if (strcmp(*argv, "-p") == 0) { 1061590Srgrimes which = PRIO_PROCESS; 1071590Srgrimes continue; 1081590Srgrimes } 1091590Srgrimes if (which == PRIO_USER) { 11094354Smaxim pwd = getpwnam(*argv); 1111590Srgrimes if (pwd == NULL) { 11227917Scharnier warnx("%s: unknown user", *argv); 1131590Srgrimes continue; 1141590Srgrimes } 1151590Srgrimes who = pwd->pw_uid; 1161590Srgrimes } else { 11794355Smaxim if (getnum("pid", *argv, &who)) 11894355Smaxim continue; 1191590Srgrimes if (who < 0) { 12027917Scharnier warnx("%s: bad value", *argv); 1211590Srgrimes continue; 1221590Srgrimes } 1231590Srgrimes } 12494355Smaxim errs += donice(which, who, prio, incr); 1251590Srgrimes } 1261590Srgrimes exit(errs != 0); 1271590Srgrimes} 1281590Srgrimes 12994354Smaximstatic int 13094355Smaximdonice(int which, int who, int prio, int incr) 13127917Scharnier{ 1321590Srgrimes int oldprio; 1331590Srgrimes 13494354Smaxim errno = 0; 13594354Smaxim oldprio = getpriority(which, who); 1361590Srgrimes if (oldprio == -1 && errno) { 13727917Scharnier warn("%d: getpriority", who); 1381590Srgrimes return (1); 1391590Srgrimes } 14094355Smaxim if (incr) 14194355Smaxim prio = oldprio + prio; 14294355Smaxim if (prio > PRIO_MAX) 14394355Smaxim prio = PRIO_MAX; 14494355Smaxim if (prio < PRIO_MIN) 14594355Smaxim prio = PRIO_MIN; 1461590Srgrimes if (setpriority(which, who, prio) < 0) { 14727917Scharnier warn("%d: setpriority", who); 1481590Srgrimes return (1); 1491590Srgrimes } 1501590Srgrimes printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 1511590Srgrimes return (0); 1521590Srgrimes} 15394354Smaxim 15494355Smaximstatic int 15594355Smaximgetnum(const char *com, const char *str, int *val) 15694355Smaxim{ 15794355Smaxim long v; 15894355Smaxim char *ep; 15994355Smaxim 16094355Smaxim errno = 0; 16194355Smaxim v = strtol(str, &ep, NULL); 16294355Smaxim if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 16394355Smaxim warnx("%s argument %s is out of range.", com, str); 16494355Smaxim return (1); 16594355Smaxim } 16694355Smaxim if (ep == str || *ep != '\0' || errno != 0) { 16794355Smaxim warnx("Bad %s argument: %s.", com, str); 16894355Smaxim return (1); 16994355Smaxim } 17094355Smaxim 17194355Smaxim *val = (int)v; 17294355Smaxim return (0); 17394355Smaxim} 17494355Smaxim 17594354Smaximstatic void 17694354Smaximusage() 17794354Smaxim{ 17894355Smaxim fprintf(stderr, "%s\n%s\n", 17994355Smaxim"usage: renice [priority | [-n incr]] [ [ -p ] pids ] [ [ -g ] pgrps ]", 18094355Smaxim" [ [ -u ] users ]"); 18194354Smaxim exit(1); 18294354Smaxim} 183