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- From: pjdm@chmeee.enet.dec.com (Peter Mayne)
- Subject: Re: NT Subsystems...
- Message-ID: <1993Jan28.044605.18806@ryn.mro4.dec.com>
- Lines: 83
- Sender: news@ryn.mro4.dec.com (USENET News System)
- Reply-To: Peter.Mayne@cao.mts.dec.com
- Organization: Digital Equipment Corporation
- References: <1993Jan26.211925.8015@mkseast.uucp>
- Date: Thu, 28 Jan 1993 04:46:05 GMT
-
-
- In article <1993Jan26.211925.8015@mkseast.uucp>, dale@mkseast.uucp (Dale Gass) writes:
- >I can see the elegance in having every user process be a client of a
- >subsystem, which is implemented in terms of NT kernel level calls.
- >However, these NT kernel level calls are apparently not accessible
- >from user level applications, only from the subsystems. If the subsystem
- >decides to provide an API to grant access to the functionality provided
- >by the kernel level API's, fine. If it doesn't, there's no way you can
- >achieve that functionality within the subsystem.
-
- That's the idea.
-
- >This strikes me as a serious disadvantage to this design approach.
- >I am at the mercy of Microsoft's subsystem implementations in determining
- >the functionality I can get out of NT. They don't provide any full-screen
- >control from the Posix subsystem, so all my Posix applications are doomed
- >to be pathetic interactively... This wouldn't be so bad if there were some
- >way for the developer to work around it, but there doesn't appear to be
- >any way to do so, short of re-implementing the subsystem from scratch.
-
- If POSIX doesn't specify full-screen control (or any other feature that you
- want), then MS are wasting time and money by (a) deciding what to add in, and
- (b) adding it in. If they do put it in, or you work around it, then it isn't
- POSIX.
-
- >Also, I have seen no evidence of a "Subsystem Developers Toolkit", which
- >would allow me to write my own subsystem to meet my all of my needs.
- >I guess these kernel level calls are the undocumented ones which Microsoft
- >doesn't document, because they are "subject to change"...
- >
- >What I would *love* to see would be either the availability of subsystem
- >source code (not likely) so a developer could extend it (which would
- >require all my customers to have the new subsystem, ugh!), or even better,
- >add some hook for developers to *extend* the API's available from a
- >subsystem.
-
- It was exactly the availability of these "features" that caused UNIX to
- become the dog's breakfast of various API's that it became. Please don't
- let NT go the same way.
-
- >With the latter approach, for example, I could implement a full curses
- >by adding the appropriate API's, written in terms of the kernel level
- >API's. This "subsystem extension" (most likely a DLL) could allow adding
- >any functionality to any subsystem, in whatever manner is most appropriate
- >to the developer.
-
- It is certain that this wouldn't work, since the kernel has no
- knowledge of the POSIX environment. The only thing that knows the POSIX
- environment and defines the POSIX semantics is the POSIX subsystem, not
- the kernel.
-
- >Without many of the common extensions found on Posix compliant system
- >(such as curses, terminfo, etc.), the Posix subsystem is more or less
- >useless. It may meet the U.S. government FIPS, but no applications of any
- >complexity could be made to work under it, so it will not be a Posix system
- >of choice.
-
- Any POSIX compliant program, no matter how complex, should work in the
- POSIX subsystem. If FIPS only allows mickey mouse (tm) programs, it's hardly
- Microsoft's fault.
-
- If POSIX isn't "complex" enough for you, use Win32. Besides, I don't
- really think that people are going to buy NT as a POSIX system of
- choice, are they? :-)
-
- >I don't necessarily expect Microsoft to provide these extensions
- >themselves, but I do expect them to make it possible for me to provide them,
- >if I wish. Currently, they don't.
-
- See above. I expect them to make it impossible to provide such
- extensions. And I hope it stays that way.
-
- >-dale
- >--
- > Dale Gass, Mortice Kern Systems, Atlantic Canada Branch
- >Business: dale@east.mks.com, Pleasure: dale@mkseast.uucp
-
- PJDM
- --
- Peter Mayne | My statements, not Digital's.
- Digital Equipment Corporation |
- Canberra, ACT, Australia | "AXP!": Bill the Cat
-
-