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/* xgethostname.c -- return current hostname with unlimited length
Copyright (C) 1992, 1996, 2000, 2001, 2003 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 */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#include "error.h"
#include "xalloc.h"
#ifndef ENAMETOOLONG
# define ENAMETOOLONG 9999
#endif
#ifndef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif
int gethostname ();
#ifndef INITIAL_HOSTNAME_LENGTH
# define INITIAL_HOSTNAME_LENGTH 34
#endif
/* Return the current hostname in malloc'd storage.
If malloc fails, exit.
Upon any other failure, return NULL. */
char *
xgethostname ()
{
char *hostname;
size_t size;
size = INITIAL_HOSTNAME_LENGTH;
/* Use size + 1 here rather than size to work around the bug
in SunOS 5.5's gethostname whereby it NUL-terminates HOSTNAME
even when the name is longer than the supplied buffer. */
hostname = xmalloc (size + 1);
while (1)
{
int k = size - 1;
int err;
errno = 0;
hostname[k] = '\0';
err = gethostname (hostname, size);
if (err >= 0 && hostname[k] == '\0')
break;
else if (err < 0 && errno != ENAMETOOLONG && errno != 0)
{
int saved_errno = errno;
free (hostname);
errno = saved_errno;
return NULL;
}
size *= 2;
hostname = xrealloc (hostname, size + 1);
}
return hostname;
}
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