How can I call the script function inside the engine?

A1.How can I call the script function inside the engine?

//Cpp code
//the main looping
int TorqueMain(int argc, const char **argv)
{
if (!torque_engineinit(argc, argv))
return 1;
while(torque_enginetick())
{
//call my script "function s() { echo("okay!"); }"
//TO DO here

}

torque_engineshutdown();

return 0;

}