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process_devicemap_information_ex.md

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This structure defines information about the process's DOS Devices map.

Applicable to

  • NtQueryInformationProcess with ProcessDeviceMap (23)
  • NtSetInformationProcess with ProcessDeviceMap (23)

Members

Set

DirectoryHandle

A handle to a directory object to set as the new device map for the process. The handle must grant DIRECTORY_TRAVERSE access.

See also

  • NtOpenDirectoryObject
  • NtCreateDirectoryObject

Query

DriveMap

A bit mask defining which drive letters are currently in use in the process's device map. Bit 0 corresponds to A:, bit 1 to B:, and so on.

DriveType

An array where each element defines the type of the drive associated with the specified letter. The value is meaningful only when the corresponding bit is set in the DriveMap field.

Known values

The possible values are defined in SDK in WinBase.h:

  • DRIVE_UNKNOWN (0) - the type of the drive is unknown.
  • DRIVE_NO_ROOT_DIR (1) - the letter points to a directory on another drive.
  • DRIVE_REMOVABLE (2) - the drive is a removable media.
  • DRIVE_FIXED (3) - the drive is a fixed disk.
  • DRIVE_REMOTE (4) - the drive is a remote device.
  • DRIVE_CDROM (5) - the drive is a CD-ROM.
  • DRIVE_RAMDISK (6) - the drive is a RAM disk.

Flags

A bit mask of flags that control the operation.

Known flags

  • PROCESS_LUID_DOSDEVICES_ONLY - perform a query only for devices defined for the current process or logon session, ignoring entries from the global DOS Devices directory.

See also

  • PROCESS_DEVICEMAP_INFORMATION