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Windows NT
Yes
Win95
No
Win32s
No
Import Library
-
Header File
winnt.h
Unicode
No
Platform Notes
None

ACCESS_MASK

The ACCESS_MASK structure is one doubleword value containing standard, specific, and generic rights. These rights are used in access-control entries (ACEs) and are the primary means of specifying the requested or granted access to an object.

typedef DWORD ACCESS_MASK;

The bits in this value are allocated as follows:

Bits
Meaning
0 through 15
Specific rights. Contains the access mask specific to the object type associated with the mask.
16 through 23
Standard rights. Contains the object's standard access rights and can be a combination of the following predefined flags:


Bit
Flag
Meaning

16
DELETE
Delete access

17
READ_CONTROL
Read access to the owner, group, and discretionary access-control list (ACL) of the security descriptor

18
WRITE_DAC
Write access to the discretionary access-control list (ACL)

19
WRITE_OWNER
Write access to owner

20
SYNCHRONIZE
Windows NT: Synchronize access

Bits
Meaning
24
Access system security (ACCESS_SYSTEM_SECURITY). This flag is not a typical access type. It is used to indicate access to a system ACL. This type of access requires the calling process to have a specific privilege.
25
Maximum allowed (MAXIMUM_ALLOWED)
26 through 27
Reserved
28
Generic all (GENERIC_ALL)
29
Generic execute (GENERIC_EXECUTE)
30
Generic write (GENERIC_WRITE)
31
Generic read (GENERIC_READ)

The following constants represent the specific and standard access rights:

#define SPECIFIC_RIGHTS_ALL 0x0000FFFF

#define STANDARD_RIGHTS_REQUIRED 0x000F0000

#define STANDARD_RIGHTS_ALL 0x001F0000

See Also

GENERIC_MAPPING

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