1 /* print the hexadecimal identifier for the current host
3 Copyright (C) 1997-2023 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 /* Written by Jim Meyering. */
22 #include <sys/types.h>
25 #include "long-options.h"
29 /* The official name of this program (e.g., no 'g' prefix). */
30 #define PROGRAM_NAME "hostid"
32 #define AUTHORS proper_name ("Jim Meyering")
37 if (status
!= EXIT_SUCCESS
)
43 Print the numeric identifier (in hexadecimal) for the current host.\n\
46 fputs (HELP_OPTION_DESCRIPTION
, stdout
);
47 fputs (VERSION_OPTION_DESCRIPTION
, stdout
);
48 emit_ancillary_info (PROGRAM_NAME
);
54 main (int argc
, char **argv
)
58 initialize_main (&argc
, &argv
);
59 set_program_name (argv
[0]);
60 setlocale (LC_ALL
, "");
61 bindtextdomain (PACKAGE
, LOCALEDIR
);
64 atexit (close_stdout
);
66 parse_gnu_standard_options_only (argc
, argv
, PROGRAM_NAME
, PACKAGE_NAME
,
67 Version
, true, usage
, AUTHORS
,
72 error (0, 0, _("extra operand %s"), quote (argv
[optind
]));
78 /* POSIX says gethostid returns a "32-bit identifier" but is silent
79 whether it's sign-extended. Turn off any sign-extension. This
80 is a no-op unless unsigned int is wider than 32 bits. */
83 printf ("%08x\n", id
);