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Diffstat (limited to 'src/hostid.c')
-rw-r--r-- | src/hostid.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/hostid.c b/src/hostid.c new file mode 100644 index 0000000..090b8a0 --- /dev/null +++ b/src/hostid.c @@ -0,0 +1,96 @@ +/* print the hexadecimal identifier for the current host + + Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004 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 2, 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, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Jim Meyering. */ + +#include <config.h> +#include <getopt.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 "Jim Meyering" + +/* The name this program was run with, for error messages. */ +char *program_name; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("\ +Usage: %s\n\ + or: %s OPTION\n\ +Print the numeric identifier (in hexadecimal) for the current host.\n\ +\n\ +"), + program_name, program_name); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + unsigned int id; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION, + usage, AUTHORS, (char const *) NULL); + if (getopt_long (argc, argv, "", NULL, NULL) != -1) + usage (EXIT_FAILURE); + + 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); + + exit (EXIT_SUCCESS); +} |