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 #include "c.h"
  49 #include "closestream.h"
  50
  51 static int donice(int,int,int);
  52
  53 static void __attribute__((__noreturn__)) usage(FILE *out)
  54 {
  55         fputs(_("\nUsage:\n"), out);
  56         fprintf(out,
  57               _(" %1$s [-n] <priority> [-p|--pid] <pid>...\n"
  58                 " %1$s [-n] <priority>  -g|--pgrp <pgid>...\n"
  59                 " %1$s [-n] <priority>  -u|--user <user>...\n"),
  60                 program_invocation_short_name);
  61
  62         fputs(_("\nOptions:\n"), out);
  63         fputs(_(" -g, --pgrp <id>        interpret argument as process group ID\n"
  64                 " -n, --priority <num>   specify the nice increment value\n"
  65                 " -p, --pid <id>         interpret argument as process ID (default)\n"
  66                 " -u, --user <name|id>   interpret argument as username or user ID\n"
  67                 " -h, --help             display help text and exit\n"
  68                 " -V, --version          display version information and exit\n"), out);
  69
  70         fputs(_("\nFor more information see renice(1).\n"), out);
  71
  72         exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
  73 }
  74
  75 /*
  76  * Change the priority (the nice value) of processes
  77  * or groups of processes which are already running.
  78  */
  79 int
  80 main(int argc, char **argv)
  81 {
  82         int which = PRIO_PROCESS;
  83         int who = 0, prio, errs = 0;
  84         char *endptr = NULL;
  85
  86         setlocale(LC_ALL, "");
  87         bindtextdomain(PACKAGE, LOCALEDIR);
  88         textdomain(PACKAGE);
  89         atexit(close_stdout);
  90
  91         argc--;
  92         argv++;
  93
  94         if (argc == 1) {
  95                 if (strcmp(*argv, "-h") == 0 ||
  96                     strcmp(*argv, "--help") == 0)
  97                         usage(stdout);
  98
  99                 if (strcmp(*argv, "-v") == 0 ||
 100                     strcmp(*argv, "-V") == 0 ||
 101                     strcmp(*argv, "--version") == 0) {
 102                         printf(_("%s from %s\n"),
 103                                program_invocation_short_name, PACKAGE_STRING);
 104                         exit(EXIT_SUCCESS);
 105                 }
 106         }
 107
 108         if (argc < 2)
 109                 usage(stderr);
 110
 111         if (strcmp(*argv, "-n") == 0 || strcmp(*argv, "--priority") == 0) {
 112                 argc--;
 113                 argv++;
 114         }
 115
 116         prio = strtol(*argv, &endptr, 10);
 117         if (*endptr)
 118                 usage(stderr);
 119
 120         argc--;
 121         argv++;
 122
 123         for (; argc > 0; argc--, argv++) {
 124                 if (strcmp(*argv, "-g") == 0 || strcmp(*argv, "--pgrp") == 0) {
 125                         which = PRIO_PGRP;
 126                         continue;
 127                 }
 128                 if (strcmp(*argv, "-u") == 0 || strcmp(*argv, "--user") == 0) {
 129                         which = PRIO_USER;
 130                         continue;
 131                 }
 132                 if (strcmp(*argv, "-p") == 0 || strcmp(*argv, "--pid") == 0) {
 133                         which = PRIO_PROCESS;
 134                         continue;
 135                 }
 136                 if (which == PRIO_USER) {
 137                         register struct passwd *pwd = getpwnam(*argv);
 138
 139                         if (pwd == NULL) {
 140                                 warnx(_("unknown user %s"), *argv);
 141                                 continue;
 142                         }
 143                         who = pwd->pw_uid;
 144                 } else {
 145                         who = strtol(*argv, &endptr, 10);
 146                         if (who < 0 || *endptr) {
 147                                 warnx(_("bad value %s"), *argv);
 148                                 continue;
 149                         }
 150                 }
 151                 errs += donice(which, who, prio);
 152         }
 153         return errs != 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 154 }
 155
 156 static int
 157 donice(int which, int who, int prio) {
 158         int oldprio, newprio;
 159         const char *idtype = _("process ID");
 160
 161         if (which == PRIO_USER)
 162                 idtype = _("user ID");
 163         else if (which == PRIO_PGRP)
 164                 idtype = _("process group ID");
 165
 166         errno = 0;
 167         oldprio = getpriority(which, who);
 168         if (oldprio == -1 && errno) {
 169                 warn(_("failed to get priority for %d (%s)"), who, idtype);
 170                 return 1;
 171         }
 172         if (setpriority(which, who, prio) < 0) {
 173                 warn(_("failed to set priority for %d (%s)"), who, idtype);
 174                 return 1;
 175         }
 176         errno = 0;
 177         newprio = getpriority(which, who);
 178         if (newprio == -1 && errno) {
 179                 warn(_("failed to get priority for %d (%s)"), who, idtype);
 180                 return 1;
 181         }
 182
 183         printf(_("%d (%s) old priority %d, new priority %d\n"),
 184                who, idtype, oldprio, newprio);
 185         return 0;
 186 }