Vitaly added the comment:

In the work-around, we need to watch out for what 'man 2 read' on Mac OS refers 
to as "normal file":

==
Upon successful completion, read(), readv(), and pread() return the number of 
bytes actually read and placed in the buffer.  *The system      guarantees to 
read the number of bytes requested if the descriptor references a normal file 
that has that many bytes left before the end-of-file*, but in no other case.
==

I am guessing that fstat() + S_ISREG() can be used to discern "normal files" 
from other types of file descriptors.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15896>
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