1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1983, 1989, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/types.h> 48 #include <sys/time.h> 49 #include <sys/resource.h> 50 51 #include <err.h> 52 #include <errno.h> 53 #include <limits.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 59 static int donice(int, int, int, int); 60 static int getnum(const char *, const char *, int *); 61 static void usage(void); 62 63 /* 64 * Change the priority (nice) of processes 65 * or groups of processes which are already 66 * running. 67 */ 68 int 69 main(int argc, char *argv[]) 70 { 71 struct passwd *pwd; 72 int errs, incr, prio, which, who; 73 74 errs = 0; 75 incr = 0; 76 which = PRIO_PROCESS; 77 who = 0; 78 argc--, argv++; 79 if (argc < 2) 80 usage(); 81 if (strcmp(*argv, "-n") == 0) { 82 incr = 1; 83 argc--, argv++; 84 if (argc < 2) 85 usage(); 86 } 87 if (getnum("priority", *argv, &prio)) 88 return (1); 89 argc--, argv++; 90 for (; argc > 0; argc--, argv++) { 91 if (strcmp(*argv, "-g") == 0) { 92 which = PRIO_PGRP; 93 continue; 94 } 95 if (strcmp(*argv, "-u") == 0) { 96 which = PRIO_USER; 97 continue; 98 } 99 if (strcmp(*argv, "-p") == 0) { 100 which = PRIO_PROCESS; 101 continue; 102 } 103 if (which == PRIO_USER) { 104 if ((pwd = getpwnam(*argv)) != NULL) 105 who = pwd->pw_uid; 106 else if (getnum("uid", *argv, &who)) { 107 errs++; 108 continue; 109 } else if (who < 0) { 110 warnx("%s: bad value", *argv); 111 errs++; 112 continue; 113 } 114 } else { 115 if (getnum("pid", *argv, &who)) { 116 errs++; 117 continue; 118 } 119 if (who < 0) { 120 warnx("%s: bad value", *argv); 121 errs++; 122 continue; 123 } 124 } 125 errs += donice(which, who, prio, incr); 126 } 127 exit(errs != 0); 128 } 129 130 static int 131 donice(int which, int who, int prio, int incr) 132 { 133 int oldprio; 134 135 errno = 0; 136 oldprio = getpriority(which, who); 137 if (oldprio == -1 && errno) { 138 warn("%d: getpriority", who); 139 return (1); 140 } 141 if (incr) 142 prio = oldprio + prio; 143 if (prio > PRIO_MAX) 144 prio = PRIO_MAX; 145 if (prio < PRIO_MIN) 146 prio = PRIO_MIN; 147 if (setpriority(which, who, prio) < 0) { 148 warn("%d: setpriority", who); 149 return (1); 150 } 151 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 152 oldprio, prio); 153 return (0); 154 } 155 156 static int 157 getnum(const char *com, const char *str, int *val) 158 { 159 long v; 160 char *ep; 161 162 errno = 0; 163 v = strtol(str, &ep, 10); 164 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 165 warnx("%s argument %s is out of range.", com, str); 166 return (1); 167 } 168 if (ep == str || *ep != '\0' || errno != 0) { 169 warnx("Bad %s argument: %s.", com, str); 170 return (1); 171 } 172 173 *val = (int)v; 174 return (0); 175 } 176 177 static void 178 usage(void) 179 { 180 fprintf(stderr, "%s\n%s\n", 181 "usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]", 182 " renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]"); 183 exit(1); 184 } 185