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# getcwd.m4 - check whether getcwd (NULL, 0) allocates memory for result
# Copyright (C) 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 Paul Eggert.
AC_DEFUN([AC_FUNC_GETCWD_NULL],
[
AC_CHECK_HEADERS_ONCE(unistd.h)
AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
[ac_cv_func_getcwd_null],
[AC_TRY_RUN(
[
# include <stdlib.h>
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
# ifndef getcwd
char *getcwd ();
# endif
int
main ()
{
if (chdir ("/") != 0)
exit (1);
else
{
char *f = getcwd (NULL, 0);
exit (! (f && f[0] == '/' && !f[1]));
}
}],
[ac_cv_func_getcwd_null=yes],
[ac_cv_func_getcwd_null=no],
[ac_cv_func_getcwd_null=no])])
if test $ac_cv_func_getcwd_null = yes; then
AC_DEFINE(HAVE_GETCWD_NULL, 1,
[Define if getcwd (NULL, 0) allocates memory for result.])
fi])
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