# 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])