The osrs_oo script is used by the Open Source Rule Set to handle the OnOpen event. The content of the script is the following.
///////////////////////////////////////////////////////////////////////////// // // file: // osrs_oo // // purpose: // OnOpen event script. // ///////////////////////////////////////////////////////////////////////////// // the include file for Open Source Rule Set events #include "osrs_inc" ///////////////////////////////////////////////////////////////////////////// void main() { // determine what type of object is calling this script int iCallingClass = osrs_GetCallerEventClass(OBJECT_SELF); switch(iCallingClass) { //////////////////////////////////////// placeable case I_OSRS_EVENT_CLASS_PLACEABLE: // Placeable::OnOpen Pre-event if (!osrs_p_oo_pre()) { return; } // Placeable::OnOpen event if (!osrs_p_oo()) { return; } // Placeable::OnOpen post-event osrs_p_oo_post(); break; //////////////////////////////////////// door case I_OSRS_EVENT_CLASS_DOOR: // Door::OnOpen Pre-event if (!osrs_d_oo_pre()) { return; } // Door::OnOpen event if (!osrs_d_oo()) { return; } // Door::OnOpen post-event osrs_d_oo_post(); break; } }