April 2015 Archive


PRINCIPLES OF I/O SOFTWARE
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PRINCIPLES OF I/O SOFTWARE

Let us now turn our attention from the I/O hardware to the I/O software. First we will consider the goals of the I/O software and then at the various ways I/O can be done from the point of view of the operating system.

I/O SOFTWARE LAYERS
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I/O SOFTWARE LAYERS

I/O software is normally organized in four layers, as illustrated in Figure 1. Each layer has a well-defined function to perform and a well-defined interface to the adjacent layers. The functionality and interfaces differ from system to system, so the discussion that follows,

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