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Chapter 10 : Case Study - UNIX - page 33 / 48

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Ceng 334 - Operating Systems

10-33

UNIX  I/O (3)

For block special files (eg., disks) the blocks are cached in a buffer cache

The buffer cache works for both reads and writes

Usually dirty (modified) blocks are written to the disk in every 30 seconds

For character special devices, data is buffered in a chain of C-lists. A C-list block is 64 characters long, plus a count and a pointer to the next block (BSD method of character buffering)

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