Function open_message_file 

pub unsafe extern "C" fn open_message_file(
    fname: *mut c_char,
) -> c_int

@ingroup message_file Creates message file, once open call to timemsg_printf(), will not send messages to tracker. Messages are kept in a queue if the application is in realtime mode, and written to disk on non real-time mode except when close_message_file() is called while in real-time mode. @param[in] fname Message file name