[issue15896] Sporadic EINVAL in nonblocking pipe os.read when forked child fails on Mac OS

[Vitaly]

Vitaly added the comment:

> Nothing, except that there are probably other places in the stdlib
> where we can get bitten by this bug. Note that this should eventually
> be done for another reason, see http://bugs.python.org/issue15918

For greatest benefit, I think that the work-around should be implemented in os.read()

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<http://bugs.python.org/issue15896>
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