Merge pull request #799 from Supermathie/freebsd-ps

message_bus: support ps on FreeBSD

vendor/gems/message_bus/lib/message_bus/diagnostics.rb

@@ -4,6 +4,8 @@ class MessageBus::Diagnostics
       system = `uname`.strip
       if system == "Darwin"
         `ps -o "comm=" -p #{Process.pid}`
+      elsif system == "FreeBSD"
+        `ps -o command -p #{Process.pid}`.split("\n",2)[1].strip()
       else
         info = `ps -eo "%p|$|%a" | grep '^\\s*#{Process.pid}'`
         info.strip.split('|$|')[1]