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 * @(#) Copyright (c) 1983, 1989, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)renice.c 8.1 (Berkeley) 6/9/93 35 * $FreeBSD: src/usr.bin/renice/renice.c,v 1.4.2.3 2002/06/17 23:58:46 tjr Exp $ 36 * $DragonFly: src/usr.bin/renice/renice.c,v 1.5 2008/10/16 01:52:33 swildner Exp $ 37 */ 38 39 #include <sys/time.h> 40 #include <sys/resource.h> 41 42 #include <err.h> 43 #include <errno.h> 44 #include <limits.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 static int donice(int, int, int, int); 51 static int getnum(const char *, const char *, int *); 52 static void usage(void); 53 54 /* 55 * Change the priority (nice) of processes 56 * or groups of processes which are already 57 * running. 58 */ 59 int 60 main(int argc, char *argv[]) 61 { 62 struct passwd *pwd; 63 int errs, incr, prio, which, who; 64 65 errs = 0; 66 incr = 0; 67 which = PRIO_PROCESS; 68 who = 0; 69 argc--, argv++; 70 if (argc < 2) 71 usage(); 72 if (strcmp(*argv, "-n") == 0) { 73 incr = 1; 74 argc--, argv++; 75 if (argc < 2) 76 usage(); 77 } 78 if (getnum("priority", *argv, &prio)) 79 return (1); 80 argc--, argv++; 81 for (; argc > 0; argc--, argv++) { 82 if (strcmp(*argv, "-g") == 0) { 83 which = PRIO_PGRP; 84 continue; 85 } 86 if (strcmp(*argv, "-u") == 0) { 87 which = PRIO_USER; 88 continue; 89 } 90 if (strcmp(*argv, "-p") == 0) { 91 which = PRIO_PROCESS; 92 continue; 93 } 94 if (which == PRIO_USER) { 95 if ((pwd = getpwnam(*argv)) != NULL) 96 who = pwd->pw_uid; 97 else if (getnum("uid", *argv, &who)) { 98 errs++; 99 continue; 100 } else if (who < 0) { 101 warnx("%s: bad value", *argv); 102 errs++; 103 continue; 104 } 105 } else { 106 if (getnum("pid", *argv, &who)) { 107 errs++; 108 continue; 109 } 110 if (who < 0) { 111 warnx("%s: bad value", *argv); 112 errs++; 113 continue; 114 } 115 } 116 errs += donice(which, who, prio, incr); 117 } 118 exit(errs != 0); 119 } 120 121 static int 122 donice(int which, int who, int prio, int incr) 123 { 124 int oldprio; 125 126 errno = 0; 127 oldprio = getpriority(which, who); 128 if (oldprio == -1 && errno) { 129 warn("%d: getpriority", who); 130 return (1); 131 } 132 if (incr) 133 prio = oldprio + prio; 134 if (prio > PRIO_MAX) 135 prio = PRIO_MAX; 136 if (prio < PRIO_MIN) 137 prio = PRIO_MIN; 138 if (setpriority(which, who, prio) < 0) { 139 warn("%d: setpriority", who); 140 return (1); 141 } 142 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 143 oldprio, prio); 144 return (0); 145 } 146 147 static int 148 getnum(const char *com, const char *str, int *val) 149 { 150 long v; 151 char *ep; 152 153 errno = 0; 154 v = strtol(str, &ep, 10); 155 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 156 warnx("%s argument %s is out of range.", com, str); 157 return (1); 158 } 159 if (ep == str || *ep != '\0') { 160 warnx("Bad %s argument: %s.", com, str); 161 return (1); 162 } 163 164 *val = (int)v; 165 return (0); 166 } 167 168 static void 169 usage(void) 170 { 171 fprintf(stderr, "%s\n%s\n", 172 "usage: renice [priority | [-n incr]] [[-p] pid ...] [[-g] pgrp ...]", 173 " [[-u] user ...]"); 174 exit(1); 175 } 176