1 /* print the hexadecimal identifier for the current host
3 Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2007-2008 Free
4 Software Foundation, Inc.
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Jim Meyering. */
24 #include <sys/types.h>
27 #include "long-options.h"
31 /* The official name of this program (e.g., no `g' prefix). */
32 #define PROGRAM_NAME "hostid"
34 #define AUTHORS proper_name ("Jim Meyering")
39 if (status != EXIT_SUCCESS)
40 fprintf (stderr, _("Try `%s --help' for more information.\n"),
47 Print the numeric identifier (in hexadecimal) for the current host.\n\
50 program_name, program_name);
51 fputs (HELP_OPTION_DESCRIPTION, stdout);
52 fputs (VERSION_OPTION_DESCRIPTION, stdout);
53 emit_bug_reporting_address ();
59 main (int argc, char **argv)
63 initialize_main (&argc, &argv);
64 set_program_name (argv[0]);
65 setlocale (LC_ALL, "");
66 bindtextdomain (PACKAGE, LOCALEDIR);
69 atexit (close_stdout);
71 parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
72 usage, AUTHORS, (char const *) NULL);
73 if (getopt_long (argc, argv, "", NULL, NULL) != -1)
78 error (0, 0, _("extra operand %s"), quote (argv[optind]));
84 /* POSIX says gethostid returns a "32-bit identifier" but is silent
85 whether it's sign-extended. Turn off any sign-extension. This
86 is a no-op unless unsigned int is wider than 32 bits. */
89 printf ("%08x\n", id);