% ls -l /dev/UPS
lrwxr-xr-x  1 root  wheel  5 Sep 13 14:34 /dev/UPS -> tty01

The terminal ioctl is something unimplemented, I suspect...and once I
create /dev/socksys the whole thing hangs anyway and never even gets to the
/dev/UPS stuff.

  5532 ls3      CALL  open(0x404660,0,0x1214e)
  5532 ls3      NAMI  "/emul/ibcs2/dev/socksys"
  5532 ls3      NAMI  "/emul/ibcs2"
  5532 ls3      NAMI  "/emul/ibcs2/dev/socksys"
  5532 ls3      RET   open 3
  5532 ls3      CALL  ioctl(0x3,_IOW('I',0x42,0x1c),0xf7bfd8b0)
  5532 ls3      RET   ioctl 4
  5532 ls3      CALL  close(0x3)
  5532 ls3      RET   close 0
  5532 ls3      CALL  fcntl(0x4,0x3,0)
  5532 ls3      RET   fcntl 2
  5532 ls3      CALL  ulimit(0x4,0x406bd4)
  5532 ls3      RET   ulimit 128/0x80
  5532 ls3      CALL  close(0x3)
  5532 ls3      RET   close -1 errno 9 Bad file descriptor
  5532 ls3      CALL  fcntl(0x4,0,0x3)
  5532 ls3      RET   fcntl 3
  5532 ls3      CALL  close(0x4)
  5532 ls3      RET   close 0
...
  5532 ls3      CALL  ioctl(0x3,_IOW('I',0x42,0x1c),0xf7bfd8b8)
  5532 ls3      RET   ioctl 0
  5532 ls3      CALL  ioctl(0x3,_IOW('S',0x9,0x4),0x1)
  5532 ls3      RET   ioctl -1 errno 89 Unknown error: 89
  5532 ls3      CALL  time(0)
  5532 ls3      RET   time 874535468/0x34205a2c
  5532 ls3      CALL  ioctl(0x3,_IOW('I',0x42,0x1c),0xf7bfd4dc)