# fcntl.m4 serial 5
-dnl Copyright (C) 2009-2013 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2014 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.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
- AC_CHECK_FUNCS_ONCE([fcntl])
+ AC_CHECK_FUNCS_ONCE([fcntl getdtablesize])
if test $ac_cv_func_fcntl = no; then
gl_REPLACE_FCNTL
else
AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly],
[gl_cv_func_fcntl_f_dupfd_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#ifdef HAVE_GETDTABLESIZE
+# include <unistd.h>
+#endif
#include <fcntl.h>
#include <errno.h>
]], [[int result = 0;
+#ifdef HAVE_GETDTABLESIZE
+ int bad_fd = getdtablesize ();
+#else
+ int bad_fd = 1000000;
+#endif
if (fcntl (0, F_DUPFD, -1) != -1) result |= 1;
if (errno != EINVAL) result |= 2;
+ if (fcntl (0, F_DUPFD, bad_fd) != -1) result |= 4;
+ if (errno != EINVAL) result |= 8;
return result;
]])],
[gl_cv_func_fcntl_f_dupfd_works=yes],