1 /* print the hexadecimal identifier for the current host
3 Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2007-2009 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"),
46 Print the numeric identifier (in hexadecimal) for the current host.\n\
49 fputs (HELP_OPTION_DESCRIPTION
, stdout
);
50 fputs (VERSION_OPTION_DESCRIPTION
, stdout
);
51 emit_bug_reporting_address ();
57 main (int argc
, char **argv
)
61 initialize_main (&argc
, &argv
);
62 set_program_name (argv
[0]);
63 setlocale (LC_ALL
, "");
64 bindtextdomain (PACKAGE
, LOCALEDIR
);
67 atexit (close_stdout
);
69 parse_long_options (argc
, argv
, PROGRAM_NAME
, PACKAGE_NAME
, Version
,
70 usage
, AUTHORS
, (char const *) NULL
);
71 if (getopt_long (argc
, argv
, "", NULL
, NULL
) != -1)
76 error (0, 0, _("extra operand %s"), quote (argv
[optind
]));
82 /* POSIX says gethostid returns a "32-bit identifier" but is silent
83 whether it's sign-extended. Turn off any sign-extension. This
84 is a no-op unless unsigned int is wider than 32 bits. */
87 printf ("%08x\n", id
);