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[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3
Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3 License: MIT
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sdk/lib/ucrt/stdio/fileno.cpp
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sdk/lib/ucrt/stdio/fileno.cpp
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//
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// fileno.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// Defines _fileno(), which returns the lowio file handle for the given stdio
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// stream.
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//
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#include <corecrt_internal_stdio.h>
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extern "C" int __cdecl _fileno(FILE* const public_stream)
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{
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__crt_stdio_stream const stream(public_stream);
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_VALIDATE_RETURN(stream.valid(), EINVAL, -1);
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return stream.lowio_handle();
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}
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