sys-utils/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
  34  /* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
  35   * - added Native Language Support
  36   */
  37
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/resource.h>
  41
  42 #include <stdio.h>
  43 #include <pwd.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <errno.h>
  47 #include "nls.h"
  48
  49 int donice(int,int,int);
  50
  51 void usage(int rc)
  52 {
  53         printf( _("\nUsage:\n"
  54                 " renice [-n] priority [-p|--pid] pid  [... pid]\n"
  55                 " renice [-n] priority  -g|--pgrp pgrp [... pgrp]\n"
  56                 " renice [-n] priority  -u|--user user [... user]\n"
  57                 " renice -h | --help\n"
  58                 " renice -v | --version\n\n"));
  59
  60         exit(rc);
  61 }
  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         int which = PRIO_PROCESS;
  72         int who = 0, prio, errs = 0;
  73         char *endptr = NULL;
  74
  75         setlocale(LC_ALL, "");
  76         bindtextdomain(PACKAGE, LOCALEDIR);
  77         textdomain(PACKAGE);
  78
  79         argc--;
  80         argv++;
  81
  82         if (argc == 1) {
  83                 if (strcmp(*argv, "-h") == 0 ||
  84                     strcmp(*argv, "--help") == 0)
  85                         usage(EXIT_SUCCESS);
  86
  87                 if (strcmp(*argv, "-v") == 0 ||
  88                     strcmp(*argv, "--version") == 0) {
  89                         printf(_("renice from %s\n"), PACKAGE_STRING);
  90                         exit(EXIT_SUCCESS);
  91                 }
  92         }
  93
  94         if (argc < 2)
  95                 usage(EXIT_FAILURE);
  96
  97         if (strcmp(*argv, "-n") == 0 || strcmp(*argv, "--priority") == 0) {
  98                 argc--;
  99                 argv++;
 100         }
 101
 102         prio = strtol(*argv, &endptr, 10);
 103         if (*endptr)
 104                 usage(EXIT_FAILURE);
 105
 106         argc--;
 107         argv++;
 108
 109         for (; argc > 0; argc--, argv++) {
 110                 if (strcmp(*argv, "-g") == 0 || strcmp(*argv, "--pgrp") == 0) {
 111                         which = PRIO_PGRP;
 112                         continue;
 113                 }
 114                 if (strcmp(*argv, "-u") == 0 || strcmp(*argv, "--user") == 0) {
 115                         which = PRIO_USER;
 116                         continue;
 117                 }
 118                 if (strcmp(*argv, "-p") == 0 || strcmp(*argv, "--pid") == 0) {
 119                         which = PRIO_PROCESS;
 120                         continue;
 121                 }
 122                 if (which == PRIO_USER) {
 123                         register struct passwd *pwd = getpwnam(*argv);
 124
 125                         if (pwd == NULL) {
 126                                 fprintf(stderr, _("renice: %s: unknown user\n"),
 127                                         *argv);
 128                                 continue;
 129                         }
 130                         who = pwd->pw_uid;
 131                 } else {
 132                         who = strtol(*argv, &endptr, 10);
 133                         if (who < 0 || *endptr) {
 134                                 fprintf(stderr, _("renice: %s: bad value\n"),
 135                                         *argv);
 136                                 continue;
 137                         }
 138                 }
 139                 errs += donice(which, who, prio);
 140         }
 141         return errs != 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 142 }
 143
 144 int
 145 donice(int which, int who, int prio) {
 146         int oldprio, newprio;
 147
 148         errno = 0;
 149         oldprio = getpriority(which, who);
 150         if (oldprio == -1 && errno) {
 151                 fprintf(stderr, "renice: %d: ", who);
 152                 perror(_("getpriority"));
 153                 return 1;
 154         }
 155         if (setpriority(which, who, prio) < 0) {
 156                 fprintf(stderr, "renice: %d: ", who);
 157                 perror(_("setpriority"));
 158                 return 1;
 159         }
 160         errno = 0;
 161         newprio = getpriority(which, who);
 162         if (newprio == -1 && errno) {
 163                 fprintf(stderr, "renice: %d: ", who);
 164                 perror(_("getpriority"));
 165                 return 1;
 166         }
 167
 168         printf(_("%d: old priority %d, new priority %d\n"),
 169                who, oldprio, newprio);
 170         return 0;
 171 }