DOS Fn 4402H: IOCTL Receive Control Data from Char Device
Expects: AX 4402H
BX file handle (device only)
CX buffer size (maximum number of bytes to receive)
DS:DX Address of buffer to receive data
Returns: AX error code if CF is set to CY
Number of bytes actually received (if no error)
Info: Some character device drivers support this method of providing
device-specific information to programs. The layout and contents
of the returned data varies from device to device.
Notes: ■ This fn is supported only if bit 14 of the rDevAttr field of
the device driver's DevHdrRec structure is set. Use Fn 4400H
to check this bit.
See Also: Fn 44H (IOCTL)
Fn 4403H (Send Control Data to Character Device)
Fn 4404H (Receive Control Data from Block Device)