This tells the driver that a block-device file or character device is
being closed.

Offset Size Contents
+0      1  bLen         0dH (length of this request packet)
+1      1  bUnitNo      (not used)
+2      1  bCmd         0eH (command code)
+3      2  rStatus      OUTPUT: Device Status Word must fill before exit
+5H     8  res          (reserved)
13               size of this record

rStatus  On exit, the driver must place a DevStatusWord here.  Always
set the Done bit (bit 8).  On an error, set the Done bit and
the Error bit (bit 15) and put a Device Error Code in the low

Notes:   Only drivers capable of device Open/Close-processing need
support this request (see Device Attribute bit 11).

  DOS uses this request whenever an application closes a file or
device (fn 3eH).  Drivers can use this in conjunction with
DvRq 0dH (Device Open) to help manage internal buffers.

See Also: Device Requests
- -

Device Request 0eH: Device Close