dowait
void dowait(Char **, struct command *);
{ "wait", dowait, 0, 0 },
void vdsp_sendmsg(struct vdsp_softc *, void *, size_t, int dowait);
vdsp_sendmsg(struct vdsp_softc *sc, void *msg, size_t len, int dowait)
if (dowait && err == EWOULDBLOCK) {
} while (dowait && err == EWOULDBLOCK);