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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1983, 1989, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)renice.c 8.1 (Berkeley) 6/9/93 31 * $FreeBSD: src/usr.bin/renice/renice.c,v 1.4.2.3 2002/06/17 23:58:46 tjr Exp $ 32 * $DragonFly: src/usr.bin/renice/renice.c,v 1.5 2008/10/16 01:52:33 swildner Exp $ 33 */ 34 35 #include <sys/time.h> 36 #include <sys/resource.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <limits.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 static int donice(int, int, int, int); 47 static int getnum(const char *, const char *, int *); 48 static void usage(void); 49 50 /* 51 * Change the priority (nice) of processes 52 * or groups of processes which are already 53 * running. 54 */ 55 int 56 main(int argc, char *argv[]) 57 { 58 struct passwd *pwd; 59 int errs, incr, prio, which, who; 60 61 errs = 0; 62 incr = 0; 63 which = PRIO_PROCESS; 64 who = 0; 65 argc--, argv++; 66 if (argc < 2) 67 usage(); 68 if (strcmp(*argv, "-n") == 0) { 69 incr = 1; 70 argc--, argv++; 71 if (argc < 2) 72 usage(); 73 } 74 if (getnum("priority", *argv, &prio)) 75 return (1); 76 argc--, argv++; 77 for (; argc > 0; argc--, argv++) { 78 if (strcmp(*argv, "-g") == 0) { 79 which = PRIO_PGRP; 80 continue; 81 } 82 if (strcmp(*argv, "-u") == 0) { 83 which = PRIO_USER; 84 continue; 85 } 86 if (strcmp(*argv, "-p") == 0) { 87 which = PRIO_PROCESS; 88 continue; 89 } 90 if (which == PRIO_USER) { 91 if ((pwd = getpwnam(*argv)) != NULL) 92 who = pwd->pw_uid; 93 else if (getnum("uid", *argv, &who)) { 94 errs++; 95 continue; 96 } else if (who < 0) { 97 warnx("%s: bad value", *argv); 98 errs++; 99 continue; 100 } 101 } else { 102 if (getnum("pid", *argv, &who)) { 103 errs++; 104 continue; 105 } 106 if (who < 0) { 107 warnx("%s: bad value", *argv); 108 errs++; 109 continue; 110 } 111 } 112 errs += donice(which, who, prio, incr); 113 } 114 exit(errs != 0); 115 } 116 117 static int 118 donice(int which, int who, int prio, int incr) 119 { 120 int oldprio; 121 122 errno = 0; 123 oldprio = getpriority(which, who); 124 if (oldprio == -1 && errno) { 125 warn("%d: getpriority", who); 126 return (1); 127 } 128 if (incr) 129 prio = oldprio + prio; 130 if (prio > PRIO_MAX) 131 prio = PRIO_MAX; 132 if (prio < PRIO_MIN) 133 prio = PRIO_MIN; 134 if (setpriority(which, who, prio) < 0) { 135 warn("%d: setpriority", who); 136 return (1); 137 } 138 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 139 oldprio, prio); 140 return (0); 141 } 142 143 static int 144 getnum(const char *com, const char *str, int *val) 145 { 146 long v; 147 char *ep; 148 149 errno = 0; 150 v = strtol(str, &ep, 10); 151 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 152 warnx("%s argument %s is out of range.", com, str); 153 return (1); 154 } 155 if (ep == str || *ep != '\0') { 156 warnx("Bad %s argument: %s.", com, str); 157 return (1); 158 } 159 160 *val = (int)v; 161 return (0); 162 } 163 164 static void 165 usage(void) 166 { 167 fprintf(stderr, "%s\n%s\n", 168 "usage: renice [priority | [-n incr]] [[-p] pid ...] [[-g] pgrp ...]", 169 " [[-u] user ...]"); 170 exit(1); 171 } 172