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/* hostname - set or print the name of current host system
Copyright (C) 1994-2022 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 "die.h"
#include "error.h"
#include "quote.h"
#include "xgethostname.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "hostname"
#define AUTHORS proper_name ("Jim Meyering")
#ifndef HAVE_SETHOSTNAME
# if defined HAVE_SYSINFO && defined HAVE_SYS_SYSTEMINFO_H
# include <sys/systeminfo.h>
# endif
static int
sethostname (char const *name, size_t namelen)
{
# if defined HAVE_SYSINFO && defined HAVE_SYS_SYSTEMINFO_H
/* Using sysinfo() is the SVR4 mechanism to set a hostname. */
return (sysinfo (SI_SET_HOSTNAME, name, namelen) < 0 ? -1 : 0);
# else
errno = ENOTSUP;
return -1;
# endif
}
#endif
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s [NAME]\n\
or: %s OPTION\n\
Print or set the hostname of the current system.\n\
\n\
"),
program_name, 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)
{
char *hostname;
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 + 1 < argc)
{
error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
usage (EXIT_FAILURE);
}
if (optind + 1 == argc)
{
/* Set hostname to operand. */
char const *name = argv[optind];
if (sethostname (name, strlen (name)) != 0)
die (EXIT_FAILURE, errno, _("cannot set name to %s"),
quote (name));
}
else
{
hostname = xgethostname ();
if (hostname == NULL)
die (EXIT_FAILURE, errno, _("cannot determine hostname"));
puts (hostname);
}
main_exit (EXIT_SUCCESS);
}
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