Blk   Chr   OCR 

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

being closed.

DevReq0eRec

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

byte.

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

DevRequestHdrRec

Installable Device Drivers

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