Thanks for your reply.

I'm confused now about the use of kill.

Kill says

Unlike in the shell, if SIGNAL is negative, it kills process groups instead of processes.

But perlipc says

Sending a signal to a negative process ID means that you send the signal to the entire Unix process group.
Which of those is true?

In reply to Re^3: Vague segfault question by ChrisDennis
in thread open3() problem by ChrisDennis

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