crw_register_handler
extern int crw_register_handler(int rsc, crw_handler_t handler);
ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw);
ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
ret = crw_register_handler(CRW_RSC_SCH, css_process_crw);