1 /* nproc - print the number of processors.
2 Copyright (C) 2009-2013 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Giuseppe Scrivano. */
22 #include <sys/types.h>
30 /* The official name of this program (e.g., no 'g' prefix). */
31 #define PROGRAM_NAME "nproc"
33 #define AUTHORS proper_name ("Giuseppe Scrivano")
37 ALL_OPTION = CHAR_MAX + 1,
41 static struct option const longopts[] =
43 {"all", no_argument, NULL, ALL_OPTION},
44 {"ignore", required_argument, NULL, IGNORE_OPTION},
45 {GETOPT_HELP_OPTION_DECL},
46 {GETOPT_VERSION_OPTION_DECL},
53 if (status != EXIT_SUCCESS)
57 printf (_("Usage: %s [OPTION]...\n"), program_name);
59 Print the number of processing units available to the current process,\n\
60 which may be less than the number of online processors\n\
64 --all print the number of installed processors\n\
65 --ignore=N if possible, exclude N processing units\n\
68 fputs (HELP_OPTION_DESCRIPTION, stdout);
69 fputs (VERSION_OPTION_DESCRIPTION, stdout);
70 emit_ancillary_info ();
76 main (int argc, char **argv)
78 unsigned long nproc, ignore = 0;
79 initialize_main (&argc, &argv);
80 set_program_name (argv[0]);
81 setlocale (LC_ALL, "");
82 bindtextdomain (PACKAGE, LOCALEDIR);
85 atexit (close_stdout);
87 enum nproc_query mode = NPROC_CURRENT_OVERRIDABLE;
91 int c = getopt_long (argc, argv, "", longopts, NULL);
96 case_GETOPT_HELP_CHAR;
98 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
105 if (xstrtoul (optarg, NULL, 10, &ignore, "") != LONGINT_OK)
107 error (0, 0, _("%s: invalid number to ignore"), optarg);
108 usage (EXIT_FAILURE);
113 usage (EXIT_FAILURE);
119 error (0, 0, _("extra operand %s"), quote (argv[optind]));
120 usage (EXIT_FAILURE);
123 nproc = num_processors (mode);
130 printf ("%lu\n", nproc);