◄Blk► ◄Chr► ◄IRW► This tells the driver to send some IOCTL data to DOS. DevReq03Rec Offset Size Contents ▀▀▀▀▀▀ ▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ +0 1 bLen 14H (length of this request packet) +1 1 bUnitNo unit number +2 1 bCmd 03H (command code) +3 2 rStatus OUTPUT: Device Status Word must fill before exit +5H 8 res (reserved) +0dH 1 bData (not used) +0eH 4 pfBuffer INPUT: buffer address +12H 2 wLen INPUT: size of data requested (in bytes) OUTPUT: actual size of data being returned 20 size of this structure 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. pfBuffer is the address of a buffer in which the driver may place the requested data. You must not store more than wLen bytes here. wLen On entry, this specifies the size of the data DOS is requesting, in bytes. On exit, you must store the actual size of the data that you supplied. Notes: ■ The layout of the data in pfBuffer is entirely device-specific and will vary from device to device. ■ There is no way to specify just what type of data is requested. See DvRq 13H (generic IOCTL) for a more flexible system. ■ This is the device driver "catch-point" for DOS fns 4402H and 4404H (receive IOCTL data). See Also: Device Requests DevRequestHdrRec Installable Device Drivers -♦-