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description title ms.date api_name api_location api_type topic_type f1_keywords helpviewer_keywords ms.assetid
Learn more about: open
open
12/16/2019
open
msvcrt.dll
msvcr80.dll
msvcr90.dll
msvcr100.dll
msvcr100_clr0400.dll
msvcr110.dll
msvcr110_clr0400.dll
msvcr120.dll
msvcr120_clr0400.dll
ucrtbase.dll
DLLExport
apiref
open
open function
e3139118-4da2-434b-a551-fcf3fccf49b5

open

The Microsoft-implemented POSIX function name open is a deprecated alias for the _open function. By default, it generates Compiler warning (level 3) C4996. The name is deprecated because it doesn't follow the Standard C rules for implementation-specific names. However, the function is still supported.

We recommend you use _open instead. Or, you can continue to use this function name, and disable the warning. For more information, see Turn off the warning and POSIX function names.