Mail Archives: djgpp/1995/02/13/11:24:32
I haven't yet seen my own message come back from the list on this topic
nor any replies, but I have solved my problem. I reported that I could
not get _go32_dpmi_simulate_fcall to work reliably when allocating
my own stack in low memory. In fact, the problem was unrelated (sheepish
grin.) In porting the original program from Microsoft C, I had missed
two uses of 'unsigned int' in the structure definitions of argument blocks
which are passed through low memory to the function I was calling. They
needed, of course, to be two-byte ints and I though I had caught all
references of this sort. Because they weren't, the argument blocks were
misaligned from that point on and appeared to be garbage to the ASPI manager.
On fixing this, I now seem to be able to talk to it succesfully. If I can
get the agreement of the code's original author, I will clean it up and make
it generally available. It provides a fairly rich subroutine library for
accessing SCSI devices under DOS or Windows via the ASPI manager interface.
The code currently only supports synchronous operation (i.e. caller blocks
until request completes) but it should be fairly simple to add asynchronous
support with a polled interface. The library is geared toward sequential-access
SCSI devices such as tapes, but I will add further support for other SCSI
devices once I've got my hands on a copy of the SCSI-2 standard or some
other work that documents other SCSI commands.
Kevin Ashley
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Kevin Ashley K DOT Ashley AT Ulcc DOT ac DOT uk
Systems Development Group Manager http://www.ulcc.ac.uk/staff/Kevin+Ashley
University of London Computer Centre. ...ukc!ncdlab!K.Ashley
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