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88412a8a83d6070b9daeb91e78337b98c08a06ac
The handlers were installed after fork(), so a signal arriving in between killed the wrapper under its inherited handler and left the new process group running. INT, TERM and HUP are now blocked around the fork and delivered once the handler is in place. The child restores the mask before exec, or the build would inherit a blocked TERM and ignore the signal the forwarding depends on.
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