CDROM_EXCLUSIVE_ACCESS structure (ntddcdrm.h)

The CDROM_EXCLUSIVE_ACCESS structure 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.

Syntax

typedef struct _CDROM_EXCLUSIVE_ACCESS {
  EXCLUSIVE_ACCESS_REQUEST_TYPE RequestType;
  ULONG                         Flags;
} CDROM_EXCLUSIVE_ACCESS, *PCDROM_EXCLUSIVE_ACCESS;

Members

RequestType

An EXCLUSIVE_ACCESS_REQUEST_TYPE-typed enumeration value that specifies the type of operation.

Flags

A flag that specifies the characteristics of the operation. The meaning of the flag depends on the type of operation that RequestType specifies. The following table describes the possible values for RequestType and Flags:

RequestType	Flags	Meaning
ExclusiveAccessQueryState	Not applicable	Not applicable
ExclusiveAccessLockDevice	0	Requires that the caller dismount the file system
	CDROM_LOCK_IGNORE_VOLUME	Ignores the file system mount and locks the device
ExclusiveAccessUnlockDevice	CDROM_NO_MEDIA_NOTIFICATIONS	Prevents the sending of a media removal notification and a media arrival notification on an exclusive access unlock

Requirements

Requirement	Value
Header	ntddcdrm.h (include Ntddcdrm.h)

See also

IOCTL_CDROM_EXCLUSIVE_ACCESS