site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Terry Lambert writes:

On Jun 15, 2006, at 6:12 AM, Andrew Gallatin wrote:

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sugumaran narayanan writes:

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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...

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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 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com