Function rtapi_fifo_delete 

pub unsafe extern "C" fn rtapi_fifo_delete(
    fifo_id: c_int,
    module_id: c_int,
) -> c_int

‘rtapi_fifo_delete()’ is the counterpart to ‘rtapi_fifo_new()’. It closes the fifo associated with ‘fifo_ID’. ‘module_id’ is the ID of the calling module. Returns status code. Call only from within user or init/cleanup code, not from realtime tasks.