[issue15918] subprocess.Popen reads errpipe_read incorrectly, can result in short read

[Vitaly]

Vitaly added the comment:

The prior 'man 2 read' quote was from Mac OS X;

On amazon (centos) Linux, 'man 2 read' makes the same claim, albeit in different verbiage:

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It is not an error if this number is smaller than the number of bytes requested; this may happen for example because fewer bytes are actually available right now (maybe because we were close to  end-of-file,  or  because  we  are  reading  from a pipe, or from a terminal), or because read() was interrupted by a signal.
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15918>
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