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

[Christian Heimes]

Christian Heimes added the comment:

It's probably better to use pid_t through the code and add a typedef int
pid_t for system's without pid_t. Or better typedef long pid_t?

On my Linux, pid_t is defined as __PID_T_TYPE, which is defines as
__S32_TYPE which ends up as int.

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nosy: +tiran
priority:  -> normal
type:  -> behavior

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