UNIX Files. How UNIX Sees and Uses Files. I/O: UNIX approach. The basic model of the UNIX I/O system is a sequence of bytes that can be accessed either randomly or sequentially.
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How UNIX Sees and Uses Files
– Block devices (structured)
– Character devices (unstructured)
considerations (e.g., communication interfaces)
OPEN: Associate an FCB with a resource path
READ: Bring a specified chunk of data from file into the process virtual address space
WRITE: Write a specified chunk of data from the process virtual address space to the file
CLOSE: Close FCB, release resource pathh