killers

#!/bin/sh

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Tries to cleanly terminate a process and waits for it to exit.
# If that fails it will kill the process.
term_process() {
  local process="$1"

  pkill -o "$process"
  for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
    pgrep "$process"
    if [ $? -ne 0 ] ; then
      return
    fi
    sleep .1
  done
  pkill -KILL "$process"
}


# For a given mountpoint, this will kill all processes with open files
# on that mountpoint so that it can be unmounted. It starts off by sending
# a TERM and if the process hasn't exited quickly enough it will send KILL.
#
# Since a typical shutdown should have no processes with open files on a
# partition that we care about at this point, we log the set of processes
# to /var/log/shutdown_force_kill_processes
kill_with_open_files_on() {
  PIDS=$(lsof -t $@ | sort -n | uniq)
  if [ -z "$PIDS" ] ; then
    return  # The typical case; no open files at this point.
  fi

  # PIDS should have been empty. Since it is not, we log for future inspection.
  lsof $@ > /var/log/shutdown_force_kill_processes

  # First try a gentle kill -TERM
  for i in 1 2 3 4 5 6 7 8 9 10; do
    for pid in $PIDS ; do
      ! kill -TERM $pid
    done
    PIDS=$(lsof -t $@ | sort -n | uniq)
    if [ -z "$PIDS" ] ; then
      return
    fi
    sleep .1
  done

  # Now kill -KILL as necessary
  PIDS=$(lsof -t $@ | sort -n | uniq)
  for i in 1 2 3 4 5 6 7 8 9 10; do
    for pid in $PIDS ; do
      ! kill -KILL $pid
    done
    PIDS=$(lsof -t $@ | sort -n | uniq)
    if [ -z "$PIDS" ] ; then
      return
    fi
    sleep .1
  done
}