mcopyinuio
(mpdata = mcopyinuio(stp, uiop, -1, -1, &error)) != NULL) {
mp = mcopyinuio(stp, uiop, iosize, maxblk, &error);
extern mblk_t *mcopyinuio(struct stdata *, uio_t *, ssize_t, ssize_t, int *);