Remove usage of sun.misc.Signal (which may not be available in Java 9)

Question

It looks like Java 9 will not continue to provide access to "internal" classes like sun.misc.Signal. Clojure currently uses this in the REPL to trap ctrl-c (SIGINT) and cancel current evaluation instead of process shutdown.

There is a page of alternatives here:
https://wiki.openjdk.java.net/display/JDK8/Java Dependency Analysis Tool

But there is no suggested alternative for sun.misc.Signal and I'm not aware of a portable solution to it.

Answer 1

Reference: https://clojure.atlassian.net/browse/CLJ-1536 (reported by alexmiller)