monitor.rb in arborist-0.0.1.pre20160606141735

- old
+ new

@@ -33,11 +33,11 @@
 	##
 	# The default number of seconds to defer startup to splay common intervals
 	DEFAULT_SPLAY = 0
 
 
-	Arborist.add_dsl_constructor( :Monitor ) do |description, &block|
+	Arborist.add_dsl_constructor( self ) do |description, &block|
 		Arborist::Monitor.new( description, &block )
 	end
 
 
 	# The module that contains the default logic for invoking an external program
@@ -248,9 +248,18 @@
 
 		context.exec_input( nodes, parent_writer )
 		parent_writer.close
 
 		return context.handle_results( pid, parent_reader, parent_err_reader )
+	rescue SystemCallError => err
+		self.log.error "%p while running external monitor command `%s`: %s" % [
+			err.class,
+			Shellwords.join( command ),
+			err.message
+		]
+		self.log.debug "  %s" % [ err.backtrace.join("\n  ") ]
+		return {}
+
 	ensure
 		if pid
 			begin
 				Process.kill( 0, pid ) # waitpid if it's still alive
 				Process.waitpid( pid )