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	BIRD Programmer's Guide: Sysdeps
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	(c) 2000 Martin Mares <mj@ucw.cz>
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<chapt>System dependent parts
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<sect>Introduction
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<p>We've tried to make BIRD as portable as possible, but unfortunately
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communication with the network stack differs from one OS to another,
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so we need at least some OS specific code. The good news is that this
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code is isolated in a small set of modules:
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<descrip>
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<tagp><tt/config.h/</tagp> is a header file with configuration information,
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definition of the standard set of types and so on.
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<tagp/Startup module/ controls BIRD startup. Common for a family of OS's (e.g.,
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for all Unices).
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<tagp/Logging module/ manages the system logs. [per OS family]
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<tagp/IO module/ gives an implementation of sockets, timers and the
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global event queue. [per OS family]
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<tagp/KRT module/ implements the Kernel and Device protocols. This
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is the most arcane part of the system dependent stuff and some
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functions differ even between various releases of a single OS.
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</descrip>