usr.bin/renice/renice.c

   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  * @(#) Copyright (c) 1983, 1989, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)renice.c 8.1 (Berkeley) 6/9/93
  35  * $FreeBSD: src/usr.bin/renice/renice.c,v 1.4.2.3 2002/06/17 23:58:46 tjr Exp $
  36  * $DragonFly: src/usr.bin/renice/renice.c,v 1.4 2005/02/10 21:06:36 liamfoy Exp $
  37  */
  38
  39 #include <sys/time.h>
  40 #include <sys/resource.h>
  41
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <limits.h>
  45 #include <pwd.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 static int      donice(int, int, int, int);
  51 static int      getnum(const char *, const char *, int *);
  52 static void     usage(void);
  53
  54 /*
  55  * Change the priority (nice) of processes
  56  * or groups of processes which are already
  57  * running.
  58  */
  59 int
  60 main(int argc, char *argv[])
  61 {
  62         struct passwd *pwd;
  63         int errs, incr, prio, which, who;
  64
  65         errs = 0;
  66         incr = 0;
  67         which = PRIO_PROCESS;
  68         who = 0;
  69         argc--, argv++;
  70         if (argc < 2)
  71                 usage();
  72         if (strcmp(*argv, "-n") == 0) {
  73                 incr = 1;
  74                 argc--, argv++;
  75                 if (argc < 2)
  76                         usage();
  77         }
  78         if (getnum("priority", *argv, &prio))
  79                 return (1);
  80         argc--, argv++;
  81         for (; argc > 0; argc--, argv++) {
  82                 if (strcmp(*argv, "-g") == 0) {
  83                         which = PRIO_PGRP;
  84                         continue;
  85                 }
  86                 if (strcmp(*argv, "-u") == 0) {
  87                         which = PRIO_USER;
  88                         continue;
  89                 }
  90                 if (strcmp(*argv, "-p") == 0) {
  91                         which = PRIO_PROCESS;
  92                         continue;
  93                 }
  94                 if (which == PRIO_USER) {
  95                         if ((pwd = getpwnam(*argv)) != NULL)
  96                                 who = pwd->pw_uid;
  97                         else if (getnum("uid", *argv, &who)) {
  98                                 errs++;
  99                                 continue;
 100                         } else if (who < 0) {
 101                                 warnx("%s: bad value", *argv);
 102                                 errs++;
 103                                 continue;
 104                         }
 105                 } else {
 106                         if (getnum("pid", *argv, &who)) {
 107                                 errs++;
 108                                 continue;
 109                         }
 110                         if (who < 0) {
 111                                 warnx("%s: bad value", *argv);
 112                                 errs++;
 113                                 continue;
 114                         }
 115                 }
 116                 errs += donice(which, who, prio, incr);
 117         }
 118         exit(errs != 0);
 119 }
 120
 121 static int
 122 donice(int which, int who, int prio, int incr)
 123 {
 124         int oldprio;
 125
 126         errno = 0;
 127         oldprio = getpriority(which, who);
 128         if (oldprio == -1 && errno) {
 129                 warn("%d: getpriority", who);
 130                 return (1);
 131         }
 132         if (incr)
 133                 prio = oldprio + prio;
 134         if (prio > PRIO_MAX)
 135                 prio = PRIO_MAX;
 136         if (prio < PRIO_MIN)
 137                 prio = PRIO_MIN;
 138         if (setpriority(which, who, prio) < 0) {
 139                 warn("%d: setpriority", who);
 140                 return (1);
 141         }
 142         fprintf(stderr, "%d: old priority %d, new priority %d\n", who,
 143             oldprio, prio);
 144         return (0);
 145 }
 146
 147 static int
 148 getnum(const char *com, const char *str, int *val)
 149 {
 150         long v;
 151         char *ep;
 152
 153         errno = 0;
 154         v = strtol(str, &ep, 10);
 155         if (v < INT_MIN || v > INT_MAX || errno == ERANGE) {
 156                 warnx("%s argument %s is out of range.", com, str);
 157                 return (1);
 158         }
 159         if (ep == str || *ep != '\0') {
 160                 warnx("Bad %s argument: %s.", com, str);
 161                 return (1);
 162         }
 163
 164         *val = (int)v;
 165         return (0);
 166 }
 167
 168 static void
 169 usage()
 170 {
 171         fprintf(stderr, "%s\n%s\n",
 172 "usage: renice [priority | [-n incr]] [[-p] pid ...] [[-g] pgrp ...]",
 173 "              [[-u] user ...]");
 174         exit(1);
 175 }