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