[issue30028] make test.support.temp_cwd() fork-safe

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Is os.getpid always available? I have found hasattr(os, 'getpid') in the logging module.

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nosy: +haypo, serhiy.storchaka, vinay.sajip
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30028>
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