August 2000
Intermediate to advanced
896 pages
28h 17m
English
book
UNIX System Administration Handbook, Third Edition
by Scott Seebass, Garth Snyder, Evi Nemeth, Trent R. Hein
Content preview from UNIX System Administration Handbook, Third Edition
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12 Drivers and the Kernel
A UNIX system encompasses essentially three layers of abstraction:
• The hardware
• The operating system kernel
• The user-level programs
The kernel hides the system’s hardware underneath an abstract, high-level programming interface. It is responsible for implementing many of the facilities that users and user-level programs take for granted. For example, the kernel assembles all of the following UNIX concepts from lower-level hardware features:
• Processes (time sharing, protected address spaces)
• Signals and semaphores
• Virtual memory (swapping, paging, mapping)
• The filesystem (files, directories, ...
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