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/* nproc - print the number of processors.
Copyright (C) 2009-2011 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Giuseppe Scrivano. */
#include <config.h>
#include <getopt.h>
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
#include "nproc.h"
#include "xstrtol.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "nproc"
#define AUTHORS proper_name ("Giuseppe Scrivano")
enum
{
ALL_OPTION = CHAR_MAX + 1,
IGNORE_OPTION
};
static struct option const longopts[] =
{
{"all", no_argument, NULL, ALL_OPTION},
{"ignore", required_argument, NULL, IGNORE_OPTION},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]...\n"), program_name);
fputs (_("\
Print the number of processing units available to the current process,\n\
which may be less than the number of online processors\n\
\n\
"), stdout);
fputs (_("\
--all print the number of installed processors\n\
--ignore=N if possible, exclude N processing units\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info ();
}
exit (status);
}
int
main (int argc, char **argv)
{
unsigned long nproc, ignore = 0;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
enum nproc_query mode = NPROC_CURRENT_OVERRIDABLE;
while (1)
{
int c = getopt_long (argc, argv, "", longopts, NULL);
if (c == -1)
break;
switch (c)
{
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
case ALL_OPTION:
mode = NPROC_ALL;
break;
case IGNORE_OPTION:
if (xstrtoul (optarg, NULL, 10, &ignore, "") != LONGINT_OK)
{
error (0, 0, _("%s: invalid number to ignore"), optarg);
usage (EXIT_FAILURE);
}
break;
default:
usage (EXIT_FAILURE);
}
}
nproc = num_processors (mode);
if (ignore < nproc)
nproc -= ignore;
else
nproc = 1;
printf ("%lu\n", nproc);
exit (EXIT_SUCCESS);
}
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