C_WAIT
if ((xfer->c_flags & (C_POLL | C_WAIT)) == (C_POLL | C_WAIT)) {
if (xfer->c_flags & C_WAIT)
xfer->c_flags |= C_WAIT;
xfer->c_flags |= C_WAIT;
xfer->c_flags |= C_WAIT;
xfer->c_flags |= C_WAIT;