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1234567891011121314151617181920//// fileno.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines _fileno(), which returns the lowio file handle for the given stdio// stream.//#include <corecrt_internal_stdio.h>
extern "C" int __cdecl _fileno(FILE* const public_stream){ __crt_stdio_stream const stream(public_stream);
_VALIDATE_RETURN(stream.valid(), EINVAL, -1); return stream.lowio_handle();}