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# fdopen.m4 serial 6
dnl Copyright (C) 2011-2023 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_FDOPEN],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
m4_ifdef([gl_MSVC_INVAL], [
AC_REQUIRE([gl_MSVC_INVAL])
if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then
REPLACE_FDOPEN=1
fi
])
if test $REPLACE_FDOPEN = 0; then
dnl Test whether fdopen() sets errno when it fails due to a bad fd argument.
AC_CACHE_CHECK([whether fdopen sets errno], [gl_cv_func_fdopen_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdio.h>
#include <errno.h>
]GL_MDA_DEFINES[
int
main (void)
{
FILE *fp;
errno = 0;
fp = fdopen (-1, "r");
if (fp == NULL && errno == 0)
return 1;
return 0;
}]])],
[gl_cv_func_fdopen_works=yes],
[gl_cv_func_fdopen_works=no],
[case "$host_os" in
mingw* | windows*) gl_cv_func_fdopen_works="guessing no" ;;
*) gl_cv_func_fdopen_works="guessing yes" ;;
esac
])
])
case "$gl_cv_func_fdopen_works" in
*no) REPLACE_FDOPEN=1 ;;
esac
fi
])
dnl Prerequisites of lib/fdopen.c.
AC_DEFUN([gl_PREREQ_FDOPEN], [])
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