// wdm.h

typedef enum _LOCK_OPERATION {
  IoReadAccess,
  IoWriteAccess,
  IoModifyAccess
} LOCK_OPERATION;
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Windows Driver Kit DDI reference (ne-wdm-_lock_operation)

_LOCK_OPERATION enumeration

Description

The LOCK_OPERATION enumeration specifies the type of access that is appropriate for a type of I/O operation.

Constants

`IoReadAccess`

This value indicates that a driver can examine the contents of a buffer but cannot change the contents.

`IoWriteAccess`

This value indicates that a driver can examine and change the contents of a buffer.

`IoModifyAccess`