#!/bin/sh PATH=/sbin:/usr/sbin:/bin:/usr/bin # Usually, /sbin/ has symlinks named halt, reboot, poweroff # (and also possibly shutdown) to e.g. # /app/shutdown-1.0/script/shutdown (this file). cd /app/shutdown-1.0/script || exit 1 test -x ./do_shutdown || exit 1 test -x ./hardshutdown || exit 1 # "reboot -f" -> "shutdown -f -r" -> "hardshutdown -r" -> immediate reboot # "reboot" -> "shutdown -r" -> "do_shutdown -r" # ^^^^^^^^^^^^^^^^^^ similarly for halt, poweroff. # "shutdown" -> "do_shutdown" (everything killed/unmounted, but kernel not asked to do any poweroff etc) force="" test x"$1" = x"-f" && { force="-f" shift } test ! "$*" && test x"${0##*/}" = x"halt" && exec "$0" $force -h test ! "$*" && test x"${0##*/}" = x"reboot" && exec "$0" $force -r test ! "$*" && test x"${0##*/}" = x"poweroff" && exec "$0" $force -p # We have something else than allowed parameters? test x"$*" = x"" || test x"$*" = x"-h" || test x"$*" = x"-r" || test x"$*" = x"-p" || { echo "Syntax: $0 [-f] [-h/-r/-p]" exit 1 } # Emergency shutdown? test "$force" && { exec ./hardshutdown "$@" exit 1 } # Normal shutdown # We must have these executables on root fs # (mount/umount aren't checked, all systems are ok versus that): test -x /bin/killall5 -o -x /sbin/killall5 || exit 1 test -x /bin/ps -o -x /sbin/ps || exit 1 test -x /bin/date -o -x /sbin/date || exit 1 test -x /bin/xargs -o -x /sbin/xargs || exit 1 test -x /bin/wc -o -x /sbin/wc || exit 1 test -x /bin/cat -o -x /sbin/cat || exit 1 test -x /bin/sort -o -x /sbin/sort || exit 1 i="`ulimit -n`" echo -n "Closing file descriptors $i-3... " while test "$i" -ge 3; do eval "exec $i>&-" i=$((i-1)) done echo "Shutting down. Please stand by..." # setsid & /dev/null: # make it a process leader & detach it from current tty. # Why /dev/null and not /dev/console? # I have seen a system which locked up while opening /dev/console # due to the bug (?) in keyboard driver. setsid env - PATH="$PATH" ./do_shutdown "$@" </dev/null >/dev/null 2>&1 & while true; do read junk; done