USR1 is not supported on JRuby

[vangberg]

Reference: c4d5d35

This doesn't work on JRuby/JVM and prints a warning:

The signal USR1 is in use by the JVM and will not work correctly on this platform

Maybe we could use ABRT instead? Does Process.exit(1) accomplish anything that kill -9 doesn't?

[benlangfeld]

We already use ABRT a few lines up. We should switch USR1 for USR2.

[bklang]

@vangberg the force_stop attempts to terminate active calls so they don't get orphaned in the telephony engine. For FreeSWITCH this shouldn't be a big deal (mod_rayo will eventually clean up), but for Asterisk, not cleaning up results in calls that have no owner and never time out.

[bklang]

Then I go back and look at the implementation and realize that's not the actual behavior we have now, though I'm pretty sure it's what we intended.

[benlangfeld]

That's the start of the shutdown process initiated by SIGINT and SIGTERM. SIGABT is intended for an abrupt stop.