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1//
2// fileno.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Defines _fileno(), which returns the lowio file handle for the given stdio
7// stream.
8//
9#include <corecrt_internal_stdio.h>
10
11
12
13extern "C" int __cdecl _fileno(FILE* const public_stream)
14{
15 __crt_stdio_stream const stream(public_stream);
16
17 _VALIDATE_RETURN(stream.valid(), EINVAL, -1);
18 return stream.lowio_handle();
19}