def action(self, arg):
        """Delegate the actions specified in 'arg' to another
        method.
        """
        if not arg:
            self.info_signal(['handle'])
            return True
        args = arg.split()
        signame = args[0]
        signame = self.is_name_or_number(args[0])
        if not signame: return

        if len(args) == 1:
            self.info_signal([signame])
            return True
        # We can display information about 'fatal' signals, but not
        # change their actions.
        if signame in fatal_signals:
            return None

        if signame not in list(self.sigs.keys()):
            if not self.initialize_handler(signame): return None
            pass

        # multiple commands might be specified, i.e. 'nopass nostop'
        for attr in args[1:]:
            if attr.startswith('no'):
                on = False
                attr = attr[2:]
            else:
                on = True
            if 'stop'.startswith(attr):
                self.handle_stop(signame, on)
            elif 'print'.startswith(attr) and len(attr) >= 2:
                self.handle_print(signame, on)
            elif 'pass'.startswith(attr):
                self.handle_pass(signame, on)
            elif 'ignore'.startswith(attr):
                self.handle_ignore(signame, on)
            elif 'stack'.startswith(attr):
                self.handle_print_stack(signame, on)
            else:
                self.dbgr.intf[-1].errmsg('Invalid arguments')
                pass
            pass
        return self.check_and_adjust_sighandler(signame, self.sigs)
Delegate the actions specified in 'arg' to another
        method.