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/* print the hexadecimal identifier for the current host
Copyright (C) 1997-2020 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 <https://www.gnu.org/licenses/>. */
/* Written by Jim Meyering. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "long-options.h"
#include "error.h"
#include "quote.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "hostid"
#define AUTHORS proper_name ("Jim Meyering")
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s [OPTION]\n\
Print the numeric identifier (in hexadecimal) for the current host.\n\
\n\
"), program_name);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
unsigned int id;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
Version, true, usage, AUTHORS,
(char const *) NULL);
if (optind < argc)
{
error (0, 0, _("extra operand %s"), quote (argv[optind]));
usage (EXIT_FAILURE);
}
id = gethostid ();
/* POSIX says gethostid returns a "32-bit identifier" but is silent
whether it's sign-extended. Turn off any sign-extension. This
is a no-op unless unsigned int is wider than 32 bits. */
id &= 0xffffffff;
printf ("%08x\n", id);
return EXIT_SUCCESS;
}
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