busybox/examples/shutdown-1.0/README
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   1# Replaces traditional overdesigned shutdown mechanism.
   2#
   3# No communication with init is necessary:
   4# just ask all processes to exit.
   5# Then unmount everything. Then reboot or power off.
   6
   7# Install /sbin/ symlinks named halt, reboot, poweroff
   8# (and also possibly shutdown) to e.g.
   9# /app/shutdown-1.0/script/shutdown:
  10#
  11ln -s /app/shutdown-1.0/script/shutdown /sbin/halt
  12ln -s /app/shutdown-1.0/script/shutdown /sbin/reboot
  13ln -s /app/shutdown-1.0/script/shutdown /sbin/poweroff
  14#
  15# shutdown spawns do_shutdown in new session, redirected to /dev/null,
  16# tells user that shutdown is in progress, and sleeps
  17# (for cosmetic reasons: do not confuse user by letting him
  18# type more commands in this terminal).
  19#
  20# do_shutdown tries to switch to a VT console.
  21# Then, (only if -r) it spawns a hardshutdown child, to reboot
  22# unconditionally in 30 seconds if something later goes seriously bad.
  23# Then it runs stop_tasks, writing to /var/log/reboot/YYYYMMDDhhmmss.log,
  24# then it runs stop_storage.
  25# Then it commands kernel to halt/reboot/poweroff, if requested.
  26# Then it sleeps forever.
  27#
  28# Build the hardshutdown binary:
  29#
  30cd script && ./hardshutdown.make.sh
  31