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Leopard Sample Code: Darwin
The Mac OS X kernel is the fundamental layer of the Mac OS X operating system. This environment includes the I/O Kit, the Mach kernel, and a BSD personality layer. Apple discourages developers from programming in the kernel, because kernel bugs can reduce the stability of the entire system. Many device drivers can be written entirely in user space and should be, where possible.
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SimpleUserClient (HTML) (DMG) (ZIP)
Shows how to create a user client for an I/O Kit kernel driver.
 2008-08-27
KauthORama (HTML) (DMG) (ZIP)
Prints each Kauth request, illustrating how Kauth interacts with high-level operations, like copying files.
 2007-04-30
EmptyFS (HTML) (DMG) (ZIP)
A very simple VFS plug-in that mounts a volume that is completely empty.
 2006-11-09
MFSLives (HTML) (DMG) (ZIP)
Sample VFS plug-in for the Macintosh File System (MFS) volume format, as used on 400KB floppies.
 2006-11-09
VendorSpecificType00 (HTML) (DMG) (ZIP)
Demonstrates how to access vendor-specific storage device functionality using a simple interface from user space code.
2006-10-02
SampleFilterScheme (HTML) (DMG) (ZIP)
Demonstrates a simple filter scheme which passes all operations through to its provider unchanged.
2006-01-03
IOPrintSuperClasses (HTML) (DMG) (ZIP)
Given the name of a class, this tool will print all of the super-classes of that class.
 2005-08-17
IOKitWithLibrary (HTML) (DMG) (ZIP)
Shows how an I/O Kit driver can link with a C library from a separate kernel extension.
 2003-08-27
SimpleDataQueue (HTML) (DMG) (ZIP)
Implements an IODataQueue inside an I/O Kit KEXT which passes events and data to user space.
 2003-01-14
TimerEventSample (HTML) (DMG) (ZIP)
Shows how to set up and use an IOTimerEventSource in a kext.
 2003-01-14