[issue23648] PEP 475 meta issue

[STINNER Victor]

STINNER Victor added the comment:

signal.sigwaitinfo() raises InterruptedError if the wait was interrupted by a signal  handler (this handler was for a signal other than one of those in set).

IMO we should also retry sigwaitinfo() if it fails with EINTR.

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<http://bugs.python.org/issue23648>
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