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- Newsgroups: comp.os.os2.programmer
- Path: sparky!uunet!newsgate.watson.ibm.com!news.ans.net!ans.net!db3l
- From: db3l@ans.net (David Bolen)
- Subject: Re: How to crash OS/2 1.2 & 1.3?
- Sender: news@ans.net (News Administrator)
- Message-ID: <1992Sep01.153604.35238@ans.net>
- In-Reply-To: dic5340@hertz.njit.edu's message of 1 Sep 92 13: 49:36 GMT
- Date: Tue, 1 Sep 1992 11:37:30 GMT
- References: <1992Aug28.131233.26834@klaava.Helsinki.FI>
- <1992Aug28.150650.719@ccsvax.sfasu.edu>
- <1992Aug29.044807.15808@access.digex.com>
- <1992Sep1.134936.6800@njitgw.njit.edu>
- Organization: Advanced Network & Services, Inc. - Elmsford, NY
- Lines: 35
-
- 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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- \ David Bolen \ Internet: db3l@ans.net /
- | Advanced Network & Services, Inc. \ Phone: (914) 789-5327 |
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