// ntddcdrm.h

typedef enum _EXCLUSIVE_ACCESS_REQUEST_TYPE {
  ExclusiveAccessQueryState,
  ExclusiveAccessLockDevice,
  ExclusiveAccessUnlockDevice
} EXCLUSIVE_ACCESS_REQUEST_TYPE, *PEXCLUSIVE_ACCESS_REQUEST_TYPE;
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Windows Driver Kit DDI reference (ne-ntddcdrm-_exclusive_access_request_type)

_EXCLUSIVE_ACCESS_REQUEST_TYPE enumeration

Description

The EXCLUSIVE_ACCESS_REQUEST_TYPE enumeration is used to report the exclusive access state of a CD-ROM device.

Constants

`ExclusiveAccessQueryState`

A query for the access state of a CD-ROM device.

`ExclusiveAccessLockDevice`

A request for the CD-ROM class driver to lock a CD-ROM device for exclusive access by the caller.

`ExclusiveAccessUnlockDevice`

A request for the CD-ROM class driver to unlock a CD-ROM device that was previously locked for exclusive access.

Remarks

The EXCLUSIVE_ACCESS_REQUEST_TYPE enumeration is used with the IOCTL_CDROM_EXCLUSIVE_ACCESS request to query the access state of a CD-ROM device or to lock or unlock the device for exclusive access.

EXCLUSIVE_ACCESS_REQUEST_TYPE - NtDoc