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# Configure fcntl.h.
dnl Copyright (C) 2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Written by Paul Eggert.
AC_DEFUN([gl_FCNTL_H],
[
AC_CACHE_CHECK([for working fcntl.h], gl_cv_header_working_fcntl_h,
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#ifndef O_NOFOLLOW
#define O_NOFOLLOW 0
#endif
static int const constants[] =
{
O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
};
]],
[[static char const sym[] = "conftest.sym";
if (O_NOFOLLOW)
{
if (symlink (".", sym) != 0)
return 1;
if (0 <= open (sym, O_RDONLY | O_NOFOLLOW))
return 1;
}
return !constants;]])],
[gl_cv_header_working_fcntl_h=yes],
[gl_cv_header_working_fcntl_h=no],
[gl_cv_header_working_fcntl_h=cross-compiling])])
if test $gl_cv_header_working_fcntl_h != yes; then
AC_DEFINE([O_NOFOLLOW_IS_INEFFECTIVE], 1,
[Define to 1 if O_NOFOLLOW is ineffective.])
fi
gl_ABSOLUTE_HEADER([fcntl.h])
ABSOLUTE_FCNTL_H=\"$gl_cv_absolute_fcntl_h\"
AC_SUBST([ABSOLUTE_FCNTL_H])
FCNTL_H='fcntl.h'
AC_SUBST([FCNTL_H])
])
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