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# freopen.m4 serial 6
dnl Copyright (C) 2007-2020 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_DEFUN([gl_FUNC_FREOPEN],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
case "$host_os" in
mingw* | pw* | os2*)
REPLACE_FREOPEN=1
;;
*)
AC_CACHE_CHECK([whether freopen works on closed fds],
[gl_cv_func_freopen_works_on_closed],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdio.h>
#include <unistd.h>
]],
[[close (0);
return !(freopen ("/dev/null", "r", stdin)
&& getchar () == EOF
&& !ferror (stdin) && feof (stdin));]])],
[gl_cv_func_freopen_works_on_closed=yes],
[gl_cv_func_freopen_works_on_closed=no],
[case $host_os in
*gnu*) gl_cv_func_freopen_works_on_closed="guessing no" ;;
*) gl_cv_func_freopen_works_on_closed="guessing yes";;
esac])])
case $gl_cv_func_freopen_works_on_closed in
*no) REPLACE_FREOPEN=1;;
esac
esac
])
# Prerequisites of lib/freopen.c.
AC_DEFUN([gl_PREREQ_FREOPEN], [:])
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