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/* hostname - set or print the name of current host system
Copyright (C) 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Jim Meyering <meyering@comco.com> */
#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
(which it would do because it found this file in $srcdir). */
#include <config.h>
#else
#include "config.h"
#endif
#endif
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "long-options.h"
#if !defined(HAVE_SETHOSTNAME) && defined(HAVE_SYSINFO) && \
defined (HAVE_SYS_SYSTEMINFO_H) && defined(HAVE_LIMITS_H)
#include <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
void error ();
char *xgethostname ();
/* The name this program was run with. */
char *program_name;
static void
usage (status)
int status;
{
if (status != 0)
fprintf (stderr, "Try `%s --help' for more information.\n",
program_name);
else
{
printf ("\
Usage: %s [NAME]\n\
or: %s OPTION\n\
\n\
--help display this help and exit\n\
--version output version information and exit\n\
"
, program_name, program_name);
}
exit (status);
}
void
main (argc, argv)
int argc;
char **argv;
{
char *hostname;
program_name = argv[0];
parse_long_options (argc, argv, "hostname", usage);
#ifdef HAVE_SETHOSTNAME
if (argc == 2)
{
int err;
/* Set hostname to argv[1]. */
err = sethostname (argv[1], strlen (argv[1]));
if (err != 0)
error (1, errno, "%s", argv[1]);
exit (0);
}
#else
if (argc == 2)
error (1, 0, "cannot set hostname; this system lacks the functionality");
#endif
if (argc == 1)
{
hostname = xgethostname ();
if (hostname == NULL)
error (1, errno, "cannot determine hostname");
printf ("%s\n", hostname);
}
else
{
error (2, 0, "too many arguments");
usage (1);
}
exit (0);
}
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