When running the code I get -1 from wait and 0 from system. $! tells me No child processes. That makes sense since both system also does a wait.

Why are you using $SIG{CHLD} with system? You shouldn't wait for a child launched using system.

In reply to Re^2: system() returns -1 with $SIG{CHLD}? by ikegami
in thread system() returns -1 with $SIG{CHLD}? by cmv

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