Florian Weimer 7fe9e2e089 posix_fallocate: Emulation fixes and documentation [BZ #15661] ...

Handle signed integer overflow correctly.  Detect and reject O_APPEND.
Document drawbacks of emulation.

This does not completely address bug 15661, but improves the situation
somewhat.

2015-06-05 10:50:38 +02:00

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