2 dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_FDOPEN],
9 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
10 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
11 m4_ifdef([gl_MSVC_INVAL], [
12 AC_REQUIRE([gl_MSVC_INVAL])
13 if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then
17 if test $REPLACE_FDOPEN = 0; then
18 dnl Test whether fdopen() sets errno when it fails due to a bad fd argument.
19 AC_CACHE_CHECK([whether fdopen sets errno], [gl_cv_func_fdopen_works],
31 fp = fdopen (-1, "r");
32 if (fp == NULL && errno == 0)
36 [gl_cv_func_fdopen_works=yes],
37 [gl_cv_func_fdopen_works=no],
39 mingw*) gl_cv_func_fdopen_works="guessing no" ;;
40 *) gl_cv_func_fdopen_works="guessing yes" ;;
44 case "$gl_cv_func_fdopen_works" in
45 *no) REPLACE_FDOPEN=1 ;;
50 dnl Prerequisites of lib/fdopen.c.
51 AC_DEFUN([gl_PREREQ_FDOPEN], [])