[Bug-apl] Cleanup when SIGINT or SIGHUP is encountered

[Elias Mårtenson]

Currently, the cleanup() function is never called when the process is killed. This causes the Emacs plugin to leave the socket file in /tmp. It would also prevent the terminal colour settings from being restored.

Attached is a patch that fixes this for these signals.

My only concern is with the naming of the "old" variable in the handler. The two variables, both having "old" in the name is ugly. :-)

Regards,

Elias

signals.diff
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