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/* hostname - set or print the name of current host system
Copyright (C) 1994-1997, 1999-2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* 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 "hostname"
#define AUTHORS "Jim Meyering"
#if HAVE_SETHOSTNAME && !defined sethostname
int sethostname ();
#endif
#if !defined(HAVE_SETHOSTNAME) && defined(HAVE_SYSINFO) && \
defined (HAVE_SYS_SYSTEMINFO_H) && defined(HAVE_LIMITS_H)
# include <sys/systeminfo.h>
int
sethostname (name, namelen)
char *name;
int namelen;
{
/* Using sysinfo() is the SVR4 mechanism to set a hostname. */
int result;
result = sysinfo (SI_SET_HOSTNAME, name, namelen);
return (result == -1 ? result : 0);
}
# define HAVE_SETHOSTNAME 1 /* Now we have it... */
#endif
char *xgethostname ();
/* The name this program was run with. */
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 [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);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
char *hostname;
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);
/* The above handles --help and --version.
Since there is no other invocation of getopt, handle `--' here. */
if (1 < argc && STREQ (argv[1], "--"))
{
--argc;
++argv;
}
#ifdef HAVE_SETHOSTNAME
if (argc == 2)
{
int err;
/* Set hostname to argv[1]. */
err = sethostname (argv[1], strlen (argv[1]));
if (err != 0)
error (EXIT_FAILURE, errno, _("cannot set hostname to `%s'"), argv[1]);
exit (EXIT_SUCCESS);
}
#else
if (argc == 2)
error (EXIT_FAILURE, 0,
_("cannot set hostname; this system lacks the functionality"));
#endif
if (argc <= 1)
{
hostname = xgethostname ();
if (hostname == NULL)
error (EXIT_FAILURE, errno, _("cannot determine hostname"));
printf ("%s\n", hostname);
}
else
{
error (0, 0, _("extra operand %s"), quote (argv[2]));
usage (EXIT_FAILURE);
}
exit (EXIT_SUCCESS);
}
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