All output goes throught the osenv_vlog interface.
The following log priorities are defined. From highest priority to lowest, they are: OSENV_LOG_EMERG, OSENV_LOG_ALERT, OSENV_LOG_CRIT, OSENV_LOG_ERR, OSENV_LOG_WARNING, OSENV_LOG_NOTICE, OSENV_LOG_INFO, and OSENV_LOG_DEBUG which correspond the the log priorities used by both BSD and Linux.