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This subsystem ensures that we can always use a certain core set of
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functions and types, that are either provided by the OS or by replacement
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functions / definitions in this subsystem. The aim is to try to stick
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to POSIX functions in here as much as possible. Convenience functions
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that are available on no platform at all belong in other subsystems
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The following functions are guaranteed:
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mkstemp (a secure one!)
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readline (the library)
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mktemp (for mkstemp and mkdtemp)