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 1.2 2003/06/17 04:29:30 dillon Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <limits.h> 46 #include <pwd.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 static int donice(int, int, int, int); 52 static int getnum(const char *, const char *, int *); 53 static void usage(void); 54 55 /* 56 * Change the priority (nice) of processes 57 * or groups of processes which are already 58 * running. 59 */ 60 int 61 main(int argc, char *argv[]) 62 { 63 struct passwd *pwd; 64 int errs, incr, prio, which, who; 65 66 errs = 0; 67 incr = 0; 68 which = PRIO_PROCESS; 69 who = 0; 70 argc--, argv++; 71 if (argc < 2) 72 usage(); 73 if (strcmp(*argv, "-n") == 0) { 74 incr = 1; 75 argc--, argv++; 76 if (argc < 2) 77 usage(); 78 } 79 if (getnum("priority", *argv, &prio)) 80 return (1); 81 argc--, argv++; 82 for (; argc > 0; argc--, argv++) { 83 if (strcmp(*argv, "-g") == 0) { 84 which = PRIO_PGRP; 85 continue; 86 } 87 if (strcmp(*argv, "-u") == 0) { 88 which = PRIO_USER; 89 continue; 90 } 91 if (strcmp(*argv, "-p") == 0) { 92 which = PRIO_PROCESS; 93 continue; 94 } 95 if (which == PRIO_USER) { 96 if ((pwd = getpwnam(*argv)) != NULL) 97 who = pwd->pw_uid; 98 else if (getnum("uid", *argv, &who)) { 99 errs++; 100 continue; 101 } else if (who < 0) { 102 warnx("%s: bad value", *argv); 103 errs++; 104 continue; 105 } 106 } else { 107 if (getnum("pid", *argv, &who)) { 108 errs++; 109 continue; 110 } 111 if (who < 0) { 112 warnx("%s: bad value", *argv); 113 errs++; 114 continue; 115 } 116 } 117 errs += donice(which, who, prio, incr); 118 } 119 exit(errs != 0); 120 } 121 122 static int 123 donice(int which, int who, int prio, int incr) 124 { 125 int oldprio; 126 127 errno = 0; 128 oldprio = getpriority(which, who); 129 if (oldprio == -1 && errno) { 130 warn("%d: getpriority", who); 131 return (1); 132 } 133 if (incr) 134 prio = oldprio + prio; 135 if (prio > PRIO_MAX) 136 prio = PRIO_MAX; 137 if (prio < PRIO_MIN) 138 prio = PRIO_MIN; 139 if (setpriority(which, who, prio) < 0) { 140 warn("%d: setpriority", who); 141 return (1); 142 } 143 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 144 oldprio, prio); 145 return (0); 146 } 147 148 static int 149 getnum(const char *com, const char *str, int *val) 150 { 151 long v; 152 char *ep; 153 154 errno = 0; 155 v = strtol(str, &ep, 10); 156 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 157 warnx("%s argument %s is out of range.", com, str); 158 return (1); 159 } 160 if (ep == str || *ep != '\0' || errno != 0) { 161 warnx("Bad %s argument: %s.", com, str); 162 return (1); 163 } 164 165 *val = (int)v; 166 return (0); 167 } 168 169 static void 170 usage() 171 { 172 fprintf(stderr, "%s\n%s\n", 173 "usage: renice [priority | [-n incr]] [[-p] pid ...] [[-g] pgrp ...]", 174 " [[-u] user ...]"); 175 exit(1); 176 } 177