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Re: may b a minor error
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Re: may b a minor error


  • Subject: Re: may b a minor error
  • From: Andrew Gallatin <email@hidden>
  • Date: Thu, 15 Jun 2006 16:49:45 -0400 (EDT)

Terry Lambert writes:
 > On Jun 15, 2006, at 6:12 AM, Andrew Gallatin wrote:
 >
 > > sugumaran narayanan writes:
 > >> Hi
 > >>    I am quite new to the Mac world...I am trying to
 > >> write(using xcode on tiger) a simple character
 > >> driver(openbsd.org example) and am facing few
 > >> problems...
 > >>
 > >>    During compile, struct uio is not recognized and I
 > >> get a dereferencing pointer to incomplete type
 > >> error...can somebody help...maybe I am not including
 > >> the correct libraries...
 > >
 > > <....>
 > >
 > > MacOSX does not allow access to core kernel structures like
 > > uio on the theory that Apple may want to change them some day,
 > > and does not want to break binary drivers when the structure
 > > changes.
 >
 > More than a theory; I've personally made kernel changes in this area

I honestly wasn't trying to bait you, but since you seem to be baiting
me...

 > for 64 bit support in the Tiger release that would break code that was
 > using promiscuous knowledge of the structure contents, instead of
 > using an accessor/mutator.  The idea is to replace data interfaces

This would not be required if you had a 64-bit kernel.

 > with accessor/mutator functions to insulate the underlying
 > implementation from necessary data structure changes.
 >
 > This is actually a fundamental Computer Science concept for object
 > oriented programming.  There's a good Wikipedia article on it at:
 >
 > 	<http://en.wikipedia.org/wiki/Accessor>
 >
 > Look in the second section, or seqrch in the page for "accessor".

Is it found right between "slow" and "inefficent" ? :)

Solaris has a much, much more stable driver ABI than you
guys do (drivers compiled before MacOSX even existed still
work) and it allows direct access to structures (like uio).

Drew

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  • Follow-Ups:
    • Re: may b a minor error
      • From: Michael Smith <email@hidden>
References: 
 >may b a minor error (From: sugumaran narayanan <email@hidden>)
 >Re: may b a minor error (From: Andrew Gallatin <email@hidden>)
 >Re: may b a minor error (From: Terry Lambert <email@hidden>)

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