[issue1983] Return from fork() is pid_t, not int

[Martin v. Löwis]

Martin v. Löwis added the comment:

Can you provide a patch? It would be good if it still worked on systems
that don't have pid_t (although we could also require pid_t and then see
what systems that breaks for).

Also, what systems use 64-bit pids?

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nosy: +loewis

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