lib/childprocess/jruby/process.rb in childprocess-0.1.6 vs lib/childprocess/jruby/process.rb in childprocess-0.1.7

@@ -26,9 +26,29 @@
         @process.waitFor # no way to actually use the timeout here..
 
         @exit_code = @process.exitValue
       end
 
+      #
+      # Only supported in JRuby on a Unix operating system, thanks to limitations
+      # in Java's classes
+      #
+      # @return [Fixnum] the pid of the process after it has started
+      # @raise [NotImplementedError] when trying to access pid on non-Unix platform
+      #
+      def pid
+        if @process.getClass.getName != "java.lang.UNIXProcess"
+          raise NotImplementedError.new("pid is not supported by JRuby child processes on Windows")
+        end
+
+        # About the best way we can do this is with a nasty reflection-based impl
+        # Thanks to Martijn Courteaux
+        # http://stackoverflow.com/questions/2950338/how-can-i-kill-a-linux-process-in-java-with-sigkill-process-destroy-does-sigter/2951193#2951193
+        field = @process.getClass.getDeclaredField("pid")
+        field.accessible = true
+        field.get(@process)
+      end
+
       private
 
       def launch_process(&blk)
         pb = java.lang.ProcessBuilder.new(@args)