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Leopard Articles
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.
Darwin Topics
View the complete Darwin Articles List.
File Management
Low-level interfaces for obtaining information about files and directories. 		 
Intel-Based Macs
Developer support for optimizing UNIX-based code for Intel-based Macs. 		 
Networking
Low-level open source networking and communication technologies.
Open Source
Open source technologies, including Darwin, WebCore, and Streaming Server. 		 
Performance
Resources for measuring, evaluating, and improving Darwin code performance. 		 
Porting
Guidance in adapting low-level code and drivers to the Darwin platform.
Process Management
Low-level facilities to help programs manage their scheduling and execution. 		 
Security
Security-related programming techniques for the lowest level of Mac OS X. 		 
Tools
Open source developer tools such as GCC and GDB.