[sr-dev] how to define an infinite while loop?

If I define an infinite loop like this: while( true ) { ... } the following warning is reported: WARNING: <core> [cfg.y:3307]: warning in config file /etc/kamailio/kamailio.cfg, line 4, column 9-12: constant value in while(...) The config file used for testing: #!KAMAILIO

route{ while( true ) { exit; } exit; }

How can I define a simple infinite loop without getting a warning in the logs.

I don't want to define a variable just for the while loop and test it. $var(true) = 1; while ($var(true)) { ... }

Is there a specific PV like '$null' or a specific keyword?

Thanks, Ovidiu Sas