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 #include <sys/types.h> 33 #include <sys/time.h> 34 #include <sys/resource.h> 35 36 #include <err.h> 37 #include <errno.h> 38 #include <limits.h> 39 #include <pwd.h> 40 #include <stdbool.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 static int donice(int, int, int, bool); 46 static int getnum(const char *, const char *, int *); 47 static void usage(void); 48 49 /* 50 * Change the priority (nice) of processes 51 * or groups of processes which are already 52 * running. 53 */ 54 int 55 main(int argc, char *argv[]) 56 { 57 struct passwd *pwd; 58 bool havedelim = false, haveprio = false, incr = false; 59 int errs = 0, prio = 0, who = 0, which = PRIO_PROCESS; 60 61 for (argc--, argv++; argc > 0; argc--, argv++) { 62 if (!havedelim) { 63 /* can occur at any time prior to delimiter */ 64 if (strcmp(*argv, "-g") == 0) { 65 which = PRIO_PGRP; 66 continue; 67 } 68 if (strcmp(*argv, "-u") == 0) { 69 which = PRIO_USER; 70 continue; 71 } 72 if (strcmp(*argv, "-p") == 0) { 73 which = PRIO_PROCESS; 74 continue; 75 } 76 if (strcmp(*argv, "--") == 0) { 77 havedelim = true; 78 continue; 79 } 80 if (strcmp(*argv, "-n") == 0) { 81 /* may occur only once, prior to priority */ 82 if (haveprio || incr || argc < 2) 83 usage(); 84 incr = true; 85 (void)argc--, argv++; 86 /* fall through to priority */ 87 } 88 } 89 if (!haveprio) { 90 /* must occur exactly once, prior to target */ 91 if (getnum("priority", *argv, &prio)) 92 return (1); 93 haveprio = true; 94 continue; 95 } 96 if (which == PRIO_USER) { 97 if ((pwd = getpwnam(*argv)) != NULL) 98 who = pwd->pw_uid; 99 else if (getnum("uid", *argv, &who)) { 100 errs++; 101 continue; 102 } else if (who < 0) { 103 warnx("%s: bad value", *argv); 104 errs++; 105 continue; 106 } 107 } else { 108 if (getnum("pid", *argv, &who)) { 109 errs++; 110 continue; 111 } 112 if (who < 0) { 113 warnx("%s: bad value", *argv); 114 errs++; 115 continue; 116 } 117 } 118 errs += donice(which, who, prio, incr); 119 } 120 if (!haveprio) 121 usage(); 122 exit(errs != 0); 123 } 124 125 static int 126 donice(int which, int who, int prio, bool incr) 127 { 128 int oldprio; 129 130 errno = 0; 131 oldprio = getpriority(which, who); 132 if (oldprio == -1 && errno) { 133 warn("%d: getpriority", who); 134 return (1); 135 } 136 if (incr) 137 prio = oldprio + prio; 138 if (prio > PRIO_MAX) 139 prio = PRIO_MAX; 140 if (prio < PRIO_MIN) 141 prio = PRIO_MIN; 142 if (setpriority(which, who, prio) < 0) { 143 warn("%d: setpriority", who); 144 return (1); 145 } 146 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 147 oldprio, prio); 148 return (0); 149 } 150 151 static int 152 getnum(const char *com, const char *str, int *val) 153 { 154 long v; 155 char *ep; 156 157 errno = 0; 158 v = strtol(str, &ep, 10); 159 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 160 warnx("%s argument %s is out of range.", com, str); 161 return (1); 162 } 163 if (ep == str || *ep != '\0' || errno != 0) { 164 warnx("%s argument %s is invalid.", com, str); 165 return (1); 166 } 167 168 *val = (int)v; 169 return (0); 170 } 171 172 static void 173 usage(void) 174 { 175 fprintf(stderr, "%s\n%s\n", 176 "usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]", 177 " renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]"); 178 exit(1); 179 } 180