| 1 | /* print the hexadecimal identifier for the current host
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| 2 |
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| 3 | Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004 Free
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| 4 | Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software Foundation,
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| 18 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 19 |
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| 20 | /* Written by Jim Meyering. */
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| 21 |
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| 22 | #include <config.h>
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| 23 | #include <getopt.h>
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| 24 | #include <stdio.h>
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| 25 | #include <sys/types.h>
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| 26 |
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| 27 | #include "system.h"
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| 28 | #include "long-options.h"
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| 29 | #include "error.h"
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| 30 | #include "quote.h"
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| 31 |
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| 32 | /* The official name of this program (e.g., no `g' prefix). */
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| 33 | #define PROGRAM_NAME "hostid"
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| 34 |
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| 35 | #define AUTHORS "Jim Meyering"
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| 36 |
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| 37 | /* The name this program was run with, for error messages. */
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| 38 | char *program_name;
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| 39 |
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| 40 | void
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| 41 | usage (int status)
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| 42 | {
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| 43 | if (status != EXIT_SUCCESS)
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| 44 | fprintf (stderr, _("Try `%s --help' for more information.\n"),
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| 45 | program_name);
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| 46 | else
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| 47 | {
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| 48 | printf (_("\
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| 49 | Usage: %s\n\
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| 50 | or: %s OPTION\n\
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| 51 | Print the numeric identifier (in hexadecimal) for the current host.\n\
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| 52 | \n\
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| 53 | "),
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| 54 | program_name, program_name);
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| 55 | fputs (HELP_OPTION_DESCRIPTION, stdout);
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| 56 | fputs (VERSION_OPTION_DESCRIPTION, stdout);
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| 57 | printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
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| 58 | }
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| 59 | exit (status);
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| 60 | }
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| 61 |
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| 62 | int
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| 63 | main (int argc, char **argv)
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| 64 | {
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| 65 | unsigned int id;
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| 66 |
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| 67 | initialize_main (&argc, &argv);
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| 68 | program_name = argv[0];
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| 69 | setlocale (LC_ALL, "");
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| 70 | bindtextdomain (PACKAGE, LOCALEDIR);
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| 71 | textdomain (PACKAGE);
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| 72 |
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| 73 | atexit (close_stdout);
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| 74 |
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| 75 | parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
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| 76 | usage, AUTHORS, (char const *) NULL);
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| 77 | if (getopt_long (argc, argv, "", NULL, NULL) != -1)
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| 78 | usage (EXIT_FAILURE);
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| 79 |
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| 80 | if (optind < argc)
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| 81 | {
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| 82 | error (0, 0, _("extra operand %s"), quote (argv[optind]));
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| 83 | usage (EXIT_FAILURE);
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| 84 | }
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| 85 |
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| 86 | id = gethostid ();
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| 87 |
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| 88 | /* POSIX says gethostid returns a "32-bit identifier" but is silent
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| 89 | whether it's sign-extended. Turn off any sign-extension. This
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| 90 | is a no-op unless unsigned int is wider than 32 bits. */
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| 91 | id &= 0xffffffff;
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| 92 |
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| 93 | printf ("%08x\n", id);
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| 94 |
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| 95 | exit (EXIT_SUCCESS);
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| 96 | }
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