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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93"; 43 #endif /* not lint */ 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/resource.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <limits.h> 56 #include <pwd.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 61 static int donice(int, int, int, int); 62 static int getnum(const char *, const char *, int *); 63 static void usage(void); 64 65 /* 66 * Change the priority (nice) of processes 67 * or groups of processes which are already 68 * running. 69 */ 70 int 71 main(int argc, char *argv[]) 72 { 73 struct passwd *pwd; 74 int errs, incr, prio, which, who; 75 76 errs = 0; 77 incr = 0; 78 which = PRIO_PROCESS; 79 who = 0; 80 argc--, argv++; 81 if (argc < 2) 82 usage(); 83 if (strcmp(*argv, "-n") == 0) { 84 incr = 1; 85 argc--, argv++; 86 if (argc < 2) 87 usage(); 88 } 89 if (getnum("priority", *argv, &prio)) 90 return (1); 91 argc--, argv++; 92 for (; argc > 0; argc--, argv++) { 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 (which == PRIO_USER) { 106 if ((pwd = getpwnam(*argv)) != NULL) 107 who = pwd->pw_uid; 108 else if (getnum("uid", *argv, &who)) { 109 errs++; 110 continue; 111 } else if (who < 0) { 112 warnx("%s: bad value", *argv); 113 errs++; 114 continue; 115 } 116 } else { 117 if (getnum("pid", *argv, &who)) { 118 errs++; 119 continue; 120 } 121 if (who < 0) { 122 warnx("%s: bad value", *argv); 123 errs++; 124 continue; 125 } 126 } 127 errs += donice(which, who, prio, incr); 128 } 129 exit(errs != 0); 130 } 131 132 static int 133 donice(int which, int who, int prio, int incr) 134 { 135 int oldprio; 136 137 errno = 0; 138 oldprio = getpriority(which, who); 139 if (oldprio == -1 && errno) { 140 warn("%d: getpriority", who); 141 return (1); 142 } 143 if (incr) 144 prio = oldprio + prio; 145 if (prio > PRIO_MAX) 146 prio = PRIO_MAX; 147 if (prio < PRIO_MIN) 148 prio = PRIO_MIN; 149 if (setpriority(which, who, prio) < 0) { 150 warn("%d: setpriority", who); 151 return (1); 152 } 153 fprintf(stderr, "%d: old priority %d, new priority %d\n", who, 154 oldprio, prio); 155 return (0); 156 } 157 158 static int 159 getnum(const char *com, const char *str, int *val) 160 { 161 long v; 162 char *ep; 163 164 errno = 0; 165 v = strtol(str, &ep, 10); 166 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { 167 warnx("%s argument %s is out of range.", com, str); 168 return (1); 169 } 170 if (ep == str || *ep != '\0' || errno != 0) { 171 warnx("Bad %s argument: %s.", com, str); 172 return (1); 173 } 174 175 *val = (int)v; 176 return (0); 177 } 178 179 static void 180 usage() 181 { 182 fprintf(stderr, "%s\n%s\n", 183 "usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]", 184 " renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]"); 185 exit(1); 186 } 187