[issue1798] Add ctypes calling convention that allows safe access of errno

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

People might get confused that errno is modified "without reason".

I don't understand the need for the TLS, either - can't you just read
and write the "true" errno (which will also be thread-local)?

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