🚀 go-pugleaf

In article <1992Sep1.134936.6800@njitgw.njit.edu> dic5340@hertz.njit.edu (David Charlap) writes:

>In article <1992Aug29.044807.15808@access.digex.com> terryfry@access.digex.com (Terry Fry) writes:
>>
>>DosPortAccess is part of the API, however it was never implemented.
>>
>If I read the API specs correctly, DosPortAccess MUST be called before
>performing any PORT I/O, in order to secure permission from the OS
>before using the ports.  Of course, the ports must be accessed from an
>IOPL segment.

Exactly - but the documentation and the implementation differ (as Terry
stated).  In other words, the documented functionality was never implemented.

I can't say anything about 2.0, but I used to do a lot of data acquisition
under 1.2/1.3 many times (from IOPL segments) using direct I/O without ever
bothering to call the DosPortAccess function, and never had any problems.
(And I did try stuff with and without the call - it seemed to be a NOOP).

>>Any IBM'ers want to shed some light?
>
>Yes, please do.  I'm confused about this now...

I'm not sure the call is even relevant nowadays.  It doesn't seem to be
documented any longer under OS/2 2.0 (at least not in the 2.0 toolkit docs
or header files), although it still has an entry point in the system dll.

--
-- David
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