bsd/kern/kern_symfile.c

341             dk_physical_extent_t getphysreq;
342             bzero(&getphysreq, sizeof(getphysreq));
344             getphysreq.offset = fileblk + physoffset;
345             getphysreq.length = (filechunk - physoffset);
346             error = do_ioctl(p1, p2, DKIOCGETPHYSICALEXTENT, (caddr_t) &getphysreq);
351                 target = getphysreq.dev;
353             else if (target != getphysreq.dev)
358             callback(callback_ref, getphysreq.offset, getphysreq.length);
359             physoffset += getphysreq.length;