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66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/***
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*umask.c - set file permission mask
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _umask() - sets file permission mask of current process*
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* affecting files created by creat, open, or sopen.
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*
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*******************************************************************************/
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#include <corecrt_internal_lowio.h>
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#include <sys\stat.h>
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extern "C" { int _umaskval = 0; }
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/***
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*errno_t _umask(mode, poldmode) - set the file mode mask
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*
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*Purpose :
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* Works similiar to umask except it validates input params.
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*
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*
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*******************************************************************************/
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extern "C" errno_t __cdecl _umask_s(
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int const mode,
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int* const old_mode
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)
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{
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_VALIDATE_RETURN_ERRCODE(old_mode != nullptr, EINVAL);
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*old_mode = _umaskval;
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_VALIDATE_RETURN_ERRCODE((mode & ~(_S_IREAD | _S_IWRITE)) == 0, EINVAL);
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_umaskval = mode;
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return 0;
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}
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/***
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*int _umask(mode) - set the file mode mask
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*
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*Purpose:
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* Sets the file-permission mask of the current process* which
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* modifies the permission setting of new files created by creat,
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* open, or sopen.
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*
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*Entry:
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* int mode - new file permission mask
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* may contain _S_IWRITE, _S_IREAD, _S_IWRITE | _S_IREAD.
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* The S_IREAD bit has no effect under Win32
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*
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*Exit:
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* returns the previous setting of the file permission mask.
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*
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*Exceptions:
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*
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*******************************************************************************/
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extern "C" int __cdecl _umask(int const mode)
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{
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// Silently ignore non-Windows modes:
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int const masked_mode = mode & (_S_IREAD | _S_IWRITE);
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int old_mode = 0;
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_umask_s(masked_mode, &old_mode);
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return old_mode;
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}
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