[issue38417] Add support for settting umask in subprocess children

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

preexec_fn does not work in subinterpreters, which (amongst others) affects mod_wsgi and similar WSGI implementations. Therefore portable software must not use preexec_fn at all.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38417>
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