indicating an unhandled "command". ERESTART is -1, which can lead to confusion. ERESTART has been moved to -3 and EPASSTHROUGH has been placed at -4. No ioctl code should now return -1 anywhere. The ioctl() system call is now properly restartable.
button with a bit coding improvement. - signed char -> int to hold integer values. Contributed 16 insn savings.
zskbd.c and zsms.c from dev/dec/, respectively. No functionality change this time.