[issue38417] Add support for settting umask in subprocess children

[Christian Heimes]

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

Changed in version 3.8: The preexec_fn parameter is no longer supported in subinterpreters. The use of the parameter in a subinterpreter raises RuntimeError. The new restriction may affect applications that are deployed in mod_wsgi, uWSGI, and other embedded environments.

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