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Chapter 10 : Case Study - UNIX - page 31 / 48

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Ceng 334 - Operating Systems

10-31

UNIX  I/O (1)

When a user accesses a special file, the file system determines the major and minor device numbers and whether it is a block or character special file

Major device number is used to index into either bdevsw array for block special or cdevsw for character special files

These structures contain pointers to the procedures to open the device, read, write etc., Some of the fields of a typical cdevsw table are shown below

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