// ntddcdrm.h

typedef struct _CDROM_EXCLUSIVE_LOCK_STATE {
  BOOLEAN LockState;
  UCHAR   CallerName[CDROM_EXCLUSIVE_CALLER_LENGTH];
} CDROM_EXCLUSIVE_LOCK_STATE, *PCDROM_EXCLUSIVE_LOCK_STATE;
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Windows Driver Kit DDI reference (ns-ntddcdrm-_cdrom_exclusive_lock_state)

_CDROM_EXCLUSIVE_LOCK_STATE structure

Description

The CDROM_EXCLUSIVE_LOCK_STATE structure is used by the CD-ROM class driver to report the exclusive access state of a CD-ROM device.

Members

`LockState`

A Boolean value that indicates whether the CD-ROM device is locked for exclusive access. If TRUE, the device is locked. If FALSE, the device is not locked.

`CallerName`

A NULL-terminated string that identifies the application or system component that has a lock on the CD-ROM device. The length of the string must be less than or equal to CDROM_EXCLUSIVE_CALLER_LENGTH bytes, including the NULL character at the end of the string. The string must contain alphanumerics (A - Z, a - z, 0 - 9), spaces, periods, commas, colons (:), semi-colons (;), hyphens (-), and underscores (_).

Remarks

The CD-ROM class driver reports the exclusive access state of a CD-ROM device in response to the IOCTL_CDROM_EXCLUSIVE_ACCESS request.

CDROM_EXCLUSIVE_LOCK_STATE - NtDoc