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 Miśkiewicz <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 const char *idtype[] = {
  52         [PRIO_PROCESS]  = N_("process ID"),
  53         [PRIO_PGRP]     = N_("process group ID"),
  54         [PRIO_USER]     = N_("user ID"),
  55 };
  56
  57 static void __attribute__((__noreturn__)) usage(void)
  58 {
  59         FILE *out = stdout;
  60         fputs(USAGE_HEADER, out);
  61         fprintf(out,
  62               _(" %1$s [-n] <priority> [-p|--pid] <pid>...\n"
  63                 " %1$s [-n] <priority>  -g|--pgrp <pgid>...\n"
  64                 " %1$s [-n] <priority>  -u|--user <user>...\n"),
  65                 program_invocation_short_name);
  66
  67         fputs(USAGE_SEPARATOR, out);
  68         fputs(_("Alter the priority of running processes.\n"), out);
  69
  70         fputs(USAGE_OPTIONS, out);
  71         fputs(_(" -n, --priority <num>   specify the nice increment value\n"), out);
  72         fputs(_(" -p, --pid <id>         interpret argument as process ID (default)\n"), out);
  73         fputs(_(" -g, --pgrp <id>        interpret argument as process group ID\n"), out);
  74         fputs(_(" -u, --user <name>|<id> interpret argument as username or user ID\n"), out);
  75         fputs(USAGE_SEPARATOR, out);
  76         printf(USAGE_HELP_OPTIONS(24));
  77         printf(USAGE_MAN_TAIL("renice(1)"));
  78         exit(EXIT_SUCCESS);
  79 }
  80
  81 static int getprio(const int which, const int who, int *prio)
  82 {
  83         errno = 0;
  84         *prio = getpriority(which, who);
  85         if (*prio == -1 && errno) {
  86                 warn(_("failed to get priority for %d (%s)"), who, idtype[which]);
  87                 return -errno;
  88         }
  89         return 0;
  90 }
  91
  92 static int donice(const int which, const int who, const int prio)
  93 {
  94         int oldprio, newprio;
  95
  96         if (getprio(which, who, &oldprio) != 0)
  97                 return 1;
  98         if (setpriority(which, who, prio) < 0) {
  99                 warn(_("failed to set priority for %d (%s)"), who, idtype[which]);
 100                 return 1;
 101         }
 102         if (getprio(which, who, &newprio) != 0)
 103                 return 1;
 104         printf(_("%d (%s) old priority %d, new priority %d\n"),
 105                who, idtype[which], oldprio, newprio);
 106         return 0;
 107 }
 108
 109 /*
 110  * Change the priority (the nice value) of processes
 111  * or groups of processes which are already running.
 112  */
 113 int main(int argc, char **argv)
 114 {
 115         int which = PRIO_PROCESS;
 116         int who = 0, prio, errs = 0;
 117         char *endptr = NULL;
 118
 119         setlocale(LC_ALL, "");
 120         bindtextdomain(PACKAGE, LOCALEDIR);
 121         textdomain(PACKAGE);
 122         close_stdout_atexit();
 123
 124         argc--;
 125         argv++;
 126
 127         if (argc == 1) {
 128                 if (strcmp(*argv, "-h") == 0 ||
 129                     strcmp(*argv, "--help") == 0)
 130                         usage();
 131
 132                 if (strcmp(*argv, "-v") == 0 ||
 133                     strcmp(*argv, "-V") == 0 ||
 134                     strcmp(*argv, "--version") == 0)
 135                         print_version(EXIT_SUCCESS);
 136         }
 137
 138         if (*argv && (strcmp(*argv, "-n") == 0 || strcmp(*argv, "--priority") == 0)) {
 139                 argc--;
 140                 argv++;
 141         }
 142
 143         if (argc < 2 || !*argv) {
 144                 warnx(_("not enough arguments"));
 145                 errtryhelp(EXIT_FAILURE);
 146         }
 147
 148         prio = strtol(*argv, &endptr, 10);
 149         if (*endptr) {
 150                 warnx(_("invalid priority '%s'"), *argv);
 151                 errtryhelp(EXIT_FAILURE);
 152         }
 153         argc--;
 154         argv++;
 155
 156         for (; argc > 0; argc--, argv++) {
 157                 if (strcmp(*argv, "-g") == 0 || strcmp(*argv, "--pgrp") == 0) {
 158                         which = PRIO_PGRP;
 159                         continue;
 160                 }
 161                 if (strcmp(*argv, "-u") == 0 || strcmp(*argv, "--user") == 0) {
 162                         which = PRIO_USER;
 163                         continue;
 164                 }
 165                 if (strcmp(*argv, "-p") == 0 || strcmp(*argv, "--pid") == 0) {
 166                         which = PRIO_PROCESS;
 167                         continue;
 168                 }
 169                 if (which == PRIO_USER) {
 170                         struct passwd *pwd = getpwnam(*argv);
 171
 172                         if (pwd != NULL)
 173                                 who = pwd->pw_uid;
 174                         else
 175                                 who = strtol(*argv, &endptr, 10);
 176                         if (who < 0 || *endptr) {
 177                                 warnx(_("unknown user %s"), *argv);
 178                                 errs = 1;
 179                                 continue;
 180                         }
 181                 } else {
 182                         who = strtol(*argv, &endptr, 10);
 183                         if (who < 0 || *endptr) {
 184                                 /* TRANSLATORS: The first %s is one of the above
 185                                  * three ID names. Read: "bad value for %s: %s" */
 186                                 warnx(_("bad %s value: %s"), idtype[which], *argv);
 187                                 errs = 1;
 188                                 continue;
 189                         }
 190                 }
 191                 errs |= donice(which, who, prio);
 192         }
 193         return errs != 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 194 }