package/base-files/files/lib/preinit/50_choose_console

   1 #!/bin/sh
   2 # Copyright (C) 2006-2010 OpenWrt.org
   3 # Copyright (C) 2010 Vertical Communications
   4
   5 choose_console() {
   6     # the shell really doesn't like having stdin/out closed
   7     # that's why we use /dev/pty/m0 and m1 (or equivalent) as replacement
   8     # for /dev/console if there's no serial console available
   9
  10     if grep devfs /proc/filesystems > /dev/null; then
  11         M0=/dev/pty/m0
  12         M1=/dev/pty/m1
  13         M2=/dev/pty/m1
  14     elif [ -x /sbin/hotplug2 ]; then
  15         M0=/dev/ptmx
  16         M1=/dev/ptmx
  17         M2=/dev/ptmx
  18     elif [ -x /sbin/udevd ]; then
  19         M0=/dev/pty/ptmx
  20         M1=/dev/pty/ptmx
  21         M2=/dev/pty/ptmx
  22     fi
  23     dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
  24         M0=/dev/console
  25         M1=/dev/console
  26         M2=/dev/console
  27     }
  28 }
  29
  30 boot_hook_add preinit_essential choose_console
  31