openwrt/target/default/target_skeleton/etc/preinit

   1 #!/bin/sh
   2 mount none /proc -t proc
   3 insmod diag
   4 echo 0x01 > /proc/sys/diag
   5 sleep 1
   6 if [ $(cat /proc/sys/reset) = 1 ] || [ "$(nvram get failsafe)" = 1 ]; then
   7   export FAILSAFE=true
   8   while :; do { echo $(((X=(X+1)%8)%2)) > /proc/sys/diag; sleep $((X==0)); } done &
   9 fi
  10 /sbin/mount_root ${FAILSAFE:+failsafe}
  11
  12 exec /sbin/init