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Darwin is the UNIX technology-based foundation of Mac OS X. Darwin integrates several technologies. Among the most important are 4.4BSD-based operating-system services (built on the Mach 3.0 microkernel), the I/O Kit, networking facilities, and support for multiple integrated file systems. Developers can use Darwin to port UNIX/Linux applications and create kernel extensions.

A guided introduction and learning path for developers new to Darwin.   Essential information for developers working in the Darwin environment.   C and Objective-C API references organized by framework.
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EmptyFS (HTML) (DMG) (ZIP)
A very simple VFS plug-in that mounts a volume that is completely empty.
File Management 2006-11-09
FileNotification (HTML) (DMG) (ZIP)
kqueue file notification introduced in 10.3. Notification API to detect file system modifications.
File Management 2005-10-27
filesystem_examples (HTML) (DMG) (ZIP)
Collection of command line tools illustrating filesystem features.
File Management 2006-01-10
FSMegaInfo (HTML) (DMG) (ZIP)
Prints information about various file system objects; helpful when debugging VFS plug-ins.
File Management 2008-02-25
MFSLives (HTML) (DMG) (ZIP)
Sample VFS plug-in for the Macintosh File System (MFS) volume format, as used on 400KB floppies.
File Management 2006-11-09
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
File Management 2003-10-27
VolumeToBSDNode (HTML) (DMG) (ZIP)
Shows how to iterate across all mounted volumes and retrieve their BSD node names.
File Management 2006-10-16
Watcher (HTML) (DMG) (ZIP)
Uses FSEvents to monitor a directory hierarchy to keep track of its total size
File Management 2006-08-04
IOKitWithLibrary (HTML) (DMG) (ZIP)
Shows how an I/O Kit driver can link with a C library from a separate kernel extension.
Hardware & Drivers 2003-08-27
IOPrintSuperClasses (HTML) (DMG) (ZIP)
Given the name of a class, this tool will print all of the super-classes of that class.
Hardware & Drivers 2005-08-17
SampleFilterScheme (HTML) (DMG) (ZIP)
Demonstrates a simple filter scheme which passes all operations through to its provider unchanged.
Hardware & Drivers 2006-01-03
SampleUSBAudioPlugin (HTML) (DMG) (ZIP)
USB audio plugin that performs a lowpass filtering operation on audio streamed through an audio USB Device.
Hardware & Drivers 2005-03-07
SCSIHBAEmulator (HTML) (DMG) (ZIP)
Demonstration of how to implement a virtual parallel tasking SCSI host bus adapter (HBA)
Hardware & Drivers 2007-02-20
SimpleDataQueue (HTML) (DMG) (ZIP)
Implements an IODataQueue inside an I/O Kit KEXT which passes events and data to user space.
Hardware & Drivers 2003-01-14
SimpleUserClient (HTML) (DMG) (ZIP)
Shows how to create a user client for an I/O Kit kernel driver.
Hardware & Drivers 2008-08-27
TimerEventSample (HTML) (DMG) (ZIP)
Shows how to set up and use an IOTimerEventSource in a kext.
Hardware & Drivers 2003-01-14
VendorSpecificType00 (HTML) (DMG) (ZIP)
Demonstrates how to access vendor-specific storage device functionality using a simple interface from user space code.
Hardware & Drivers 2006-10-02
VolumeToBSDNode (HTML) (DMG) (ZIP)
Shows how to iterate across all mounted volumes and retrieve their BSD node names.
Hardware & Drivers 2006-10-16
BootstrapDump (HTML) (DMG) (ZIP)
Print Mach bootstrap namespace information.
Interprocess Communication 2008-06-18
NotifyTool (HTML) (DMG) (ZIP)
Shows how to use the BSD notify API.
Interprocess Communication 2007-09-25
EmptyFS (HTML) (DMG) (ZIP)
A very simple VFS plug-in that mounts a volume that is completely empty.
Kernel 2006-11-09
IOKitWithLibrary (HTML) (DMG) (ZIP)
Shows how an I/O Kit driver can link with a C library from a separate kernel extension.
Kernel 2003-08-27
IOPrintSuperClasses (HTML) (DMG) (ZIP)
Given the name of a class, this tool will print all of the super-classes of that class.
Kernel 2005-08-17
KauthORama (HTML) (DMG) (ZIP)
Prints each Kauth request, illustrating how Kauth interacts with high-level operations, like copying files.
Kernel 2007-04-30
MFSLives (HTML) (DMG) (ZIP)
Sample VFS plug-in for the Macintosh File System (MFS) volume format, as used on 400KB floppies.
Kernel 2006-11-09
SampleFilterScheme (HTML) (DMG) (ZIP)
Demonstrates a simple filter scheme which passes all operations through to its provider unchanged.
Kernel 2006-01-03
SimpleDataQueue (HTML) (DMG) (ZIP)
Implements an IODataQueue inside an I/O Kit KEXT which passes events and data to user space.
Kernel 2003-01-14
SimpleUserClient (HTML) (DMG) (ZIP)
Shows how to create a user client for an I/O Kit kernel driver.
Kernel 2008-08-27
TimerEventSample (HTML) (DMG) (ZIP)
Shows how to set up and use an IOTimerEventSource in a kext.
Kernel 2003-01-14
VendorSpecificType00 (HTML) (DMG) (ZIP)
Demonstrates how to access vendor-specific storage device functionality using a simple interface from user space code.
Kernel 2006-10-02
CFLocalServer (HTML) (DMG) (ZIP)
Uses UNIX domain sockets to communicate between client and server programs on the same machine.
Networking 2005-07-26
CFProxySupportTool (HTML) (DMG) (ZIP)
Shows how to use the CFProxySupport APIs to decide whether a network connection should pass through a proxy.
Networking 2007-10-29
DNSServiceMetaQuery (HTML) (DMG) (ZIP)
Shows how to discover Bonjour service types being advertised on the local network.
Networking 2005-06-01
GetMACAddressSample (HTML) (DMG) (ZIP)
Demonstrates how to retrieve the MAC address for each Ethernet interface from the Mac OS X I/O Registry.
Networking 2003-01-14
GetPrimaryMACAddress (HTML) (DMG) (ZIP)
Demonstrates retrieving the MAC address of the built-in Ethernet controller. Useful for uniquely identifying a Macintosh system.
Networking 2005-10-27
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Networking 2003-10-27
MoreSCF (HTML) (DMG) (ZIP)
High-level wrapper around System Configuration framework, making common operations easy.
Networking 2007-06-07
NetworkAuthentication (HTML) (DMG) (ZIP)
Demonstrates authentication with Open Directory APIs and GSSAPI
Networking 2005-06-01
QISA (HTML) (DMG) (ZIP)
Demonstrates the basics of writing an Internet setup assistant for traditional Mac OS and Mac OS X.
Networking 2003-05-15
SimpleDial (HTML) (DMG) (ZIP)
Demonstrates management of dialup connections, such as PPP, using System Configuration framework network connection API.
Networking 2005-07-26
SimplePing (HTML) (DMG) (ZIP)
Sample provides simple API to programatically ping a remote host without admin privileges
Networking 2003-10-27
SimpleReach (HTML) (DMG) (ZIP)
Demonstrates network host reachability testing using the System Configuration framework asynchronous network reachability API.
Networking 2005-07-26
SocketCancel (HTML) (DMG) (ZIP)
Shows how to safely cancel threads that are blocked within BSD sockets calls.
Networking 2005-08-10
dist_fft (HTML) (DMG) (ZIP)
Gigaelement FFTs on Apple G5 clusters
Performance 2004-08-23
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Porting 2003-10-27
Moriarity (HTML) (DMG) (ZIP)
Implementing a Cocoa GUI that wraps command-line functionality, calling a UNIX task and presenting the results in a GUI.
Porting 2003-01-14
PIDFromBSDProcessName (HTML) (DMG) (ZIP)
Provides a simple API to do process PID lookup based on BSD process name.
Porting 2003-02-13
BootstrapDump (HTML) (DMG) (ZIP)
Print Mach bootstrap namespace information.
Process Management 2008-06-18
CFLocalServer (HTML) (DMG) (ZIP)
Uses UNIX domain sockets to communicate between client and server programs on the same machine.
Process Management 2005-07-26
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Process Management 2003-10-27
PIDFromBSDProcessName (HTML) (DMG) (ZIP)
Provides a simple API to do process PID lookup based on BSD process name.
Process Management 2003-02-13
SampleD (HTML) (DMG) (ZIP)
Demonstrates use of launchd and Apple System Logger.
Process Management 2005-10-27
UTXplorer (HTML) (DMG) (ZIP)
Uses the <utmpx.h> API to display current login sessions and login history.
Process Management 2008-03-19
MachPortDump (HTML) (DMG) (ZIP)
Dumps out the Mach port name space of a process; useful when debugging port right leaks.
Resource Management 2005-08-10
MapLargeFile (HTML) (DMG) (ZIP)
Shows a technique for mapping files greater than 4GB into memory for faster access.
Resource Management 2003-11-19
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Resource Management 2003-10-27
CheckExecutableArchitecture (HTML) (DMG) (ZIP)
Determine whether a particular Mach-O executable contains a version suitable for executing on a given processor architecture.
Runtime Architecture 2006-02-07
MemoryBasedBundle (HTML) (DMG) (ZIP)
Shows how to execute Mach-O code from memory, much like GetMemFragment in CFM.
Runtime Architecture 2005-08-10
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Runtime Architecture 2003-10-27
CryptNoMore (HTML) (DMG) (ZIP)
Shows how to authenticate a user using Open Directory (Directory Services).
Security 2008-03-17
CryptoSample (HTML) (DMG) (ZIP)
Contains sample code showing symmetric encryption and message digest calculation.
Security 2003-02-06
GetMACAddressSample (HTML) (DMG) (ZIP)
Demonstrates how to retrieve the MAC address for each Ethernet interface from the Mac OS X I/O Registry.
Security 2003-01-14
GetPrimaryMACAddress (HTML) (DMG) (ZIP)
Demonstrates retrieving the MAC address of the built-in Ethernet controller. Useful for uniquely identifying a Macintosh system.
Security 2005-10-27
KauthORama (HTML) (DMG) (ZIP)
Prints each Kauth request, illustrating how Kauth interacts with high-level operations, like copying files.
Security 2007-04-30
MoreIsBetter (HTML) (DMG) (ZIP)
Library providing indispensable wrapers and workarounds for many areas of Mac OS programming.
Security 2003-10-27
QISA (HTML) (DMG) (ZIP)
Demonstrates the basics of writing an Internet setup assistant for traditional Mac OS and Mac OS X.
Security 2003-05-15
SSLSample (HTML) (DMG) (ZIP)
Contains examples showing how to use SecureTransport.
Security 2003-01-14
PIDFromBSDProcessName (HTML) (DMG) (ZIP)
Provides a simple API to do process PID lookup based on BSD process name.
Tools 2003-02-13