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 delim, errs, incr, prio, which, who; 73 74 delim = 0; 75 errs = 0; 76 incr = 0; 77 which = PRIO_PROCESS; 78 who = 0; 79 argc--, argv++; 80 if (argc < 2) 81 usage(); 82 if (strcmp(*argv, "-n") == 0) { 83 incr = 1; 84 argc--, argv++; 85 if (argc < 2) 86 usage(); 87 } 88 if (getnum("priority", *argv, &prio)) 89 return (1); 90 argc--, argv++; 91 for (; argc > 0; argc--, argv++) { 92 if (!delim) { 93 if (strcmp(*argv, "-g") == 0) { 94 which = PRIO_PGRP; 95 continue; 96 } 97 if (strcmp(*argv, "-u") == 0) { 98 which = PRIO_USER; 99 continue; 100 } 101 if (strcmp(*argv, "-p") == 0) { 102 which = PRIO_PROCESS; 103 continue; 104 } 105 if (strcmp(*argv, "--") == 0) { 106 delim = 1; 107 continue; 108 } 109 } 110 if (which == PRIO_USER) { 111 if ((pwd = getpwnam(*argv)) != NULL) 112 who = pwd->pw_uid; 113 else if (getnum("uid", *argv, &who)) { 114 errs++; 115 continue; 116 } else if (who < 0) { 117 warnx("%s: bad value", *argv); 118 errs++; 119 continue; 120 } 121 } else { 122 if (getnum("pid", *argv, &who)) { 123 errs++; 124 continue; 125 } 126 if (who < 0) { 127 warnx("%s: bad value", *argv); 128 errs++; 129 continue; 130 } 131 } 132 errs += donice(which, who, prio, incr); 133 } 134 exit(errs != 0); 135 } 136 137 static int 138 donice(int which, int who, int prio, int incr) 139 { 140 int oldprio; 141 142 errno = 0; 143 oldprio = getpriority(which, who); 144 if (oldprio == -1 && errno) { 145 warn("%d: getpriority", who); 146 return (1); 147 } 148 if (incr) 149 prio = oldprio + prio; 150 if (prio > PRIO_MAX) 151 prio = PRIO_MAX; 152 if (prio < PRIO_MIN) 153 prio = PRIO_MIN; 154 if (setpriority(which, who, prio) < 0) { 155 warn("%d: setpriority", who); 156 return (1); 157 } 158 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 159 oldprio, prio); 160 return (0); 161 } 162 163 static int 164 getnum(const char *com, const char *str, int *val) 165 { 166 long v; 167 char *ep; 168 169 errno = 0; 170 v = strtol(str, &ep, 10); 171 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 172 warnx("%s argument %s is out of range.", com, str); 173 return (1); 174 } 175 if (ep == str || *ep != '\0' || errno != 0) { 176 warnx("Bad %s argument: %s.", com, str); 177 return (1); 178 } 179 180 *val = (int)v; 181 return (0); 182 } 183 184 static void 185 usage(void) 186 { 187 fprintf(stderr, "%s\n%s\n", 188 "usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]", 189 " renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]"); 190 exit(1); 191 } 192