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LOCK_OPERATION enumeration (wdm.h)
The LOCK_OPERATION enumeration specifies the type of access that is appropriate for a type of I/O operation.
Syntax
typedef enum _LOCK_OPERATION {
IoReadAccess,
IoWriteAccess,
IoModifyAccess
} LOCK_OPERATION;
Constants
IoReadAccessThis value indicates that a driver can examine the contents of a buffer but cannot change the contents. |
IoWriteAccessThis value indicates that a driver can examine and change the contents of a buffer. |
IoModifyAccessThis value indicates that a driver can examine and change the contents of a buffer. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating system. |
| Header | wdm.h (include Wdm.h) |
See also
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