LXR busybox/examples/shutdown-1.0/script/stop

   1#!/bin/sh
   2# Do unmount/remount-ro. Wait.
   3# KILL everybody. Wait.
   4# Repeat.
   5
   6umountcnt=2
   7writeout=0      # increase if your kernel does not guarantee writes to complete
   8
   9# No /usr - we are expecting all binaries to be accessible
  10# from root fs alone
  11PATH=/sbin:/bin
  12
  13say() {
  14        printf "\r%s\n\r" "$*"
  15}
  16
  17showps() {
  18        # sleep 1 ensures that xargs will have time to start up
  19        # this makes pslist less prone to random jitter
  20        pslist=`{ sleep 1; ps -A -o comm=; } | sort | xargs`
  21        pscnt=$(( `say "$pslist" | wc -w` + 0 ))
  22        if test x"$VERBOSE" = x; then
  23                say "* `date '+%H:%M:%S'` $pscnt processes"
  24        else
  25                say "* `date '+%H:%M:%S'` Processes ($pscnt): $pslist"
  26        fi
  27}
  28
  29say "<*> `date '+%Y-%m-%d %H:%M:%S'` Executing '$0 $*'"
  30
  31showps
  32
  33i="$umountcnt"
  34while test "$i" -gt 0; do
  35        say "* `date '+%H:%M:%S'` Unmounting filesystems"
  36        umount -a -n -r -f
  37        # In case we unmounted proc...
  38        test -e /proc/version || mount -t proc none /proc
  39        # Remounting / RO isn't necessary when /etc/mtab is linked to /proc/mounts:
  40        # already done. But let's be more paranoid here...
  41        say "* `date '+%H:%M:%S'` Remounting root filesystem read-only"
  42        mount -n -o remount,ro /
  43        say "* `date '+%H:%M:%S'` Freeing loop devices"
  44        for a in /dev/loop*; do
  45                test -b "$a" && losetup -d "$a"
  46        done
  47        say "* `date '+%H:%M:%S'` Syncing"
  48        sync
  49        say "* `date '+%H:%M:%S'` Executing: killall5 -KILL"
  50        killall5 -9
  51        showps
  52        i=$((i-1))
  53done
  54
  55say "* `date '+%H:%M:%S'` Filesystem status (/proc/mounts)"
  56cat /proc/mounts \
  57| {
  58        bad=false
  59        while read dev mntpoint fstype opt n1 n2; do
  60                case "$fstype" in
  61                ( proc | sysfs | usbfs | devpts | rpc_pipefs | binfmt_misc | autofs | rootfs | tmpfs | ramfs )
  62                        say "$dev $mntpoint $fstype $opt $n1 $n2"
  63                        continue
  64                        ;;
  65                esac
  66                if test "${opt:0:2}" = "rw"; then
  67                        say "$dev $mntpoint $fstype $opt $n1 $n2 - RW!"
  68                        bad=true
  69                else
  70                        say "$dev $mntpoint $fstype $opt $n1 $n2"
  71                fi
  72        done
  73        if $bad; then
  74                say "ERROR: we have filesystems mounted RW! Press <Enter> (^J)..."
  75                read junk </dev/console
  76                #sh </dev/console >&0 2>&0 # debug
  77        fi
  78}
  79
  80# Disk cache writeout
  81sleep "$writeout"
  82