#!/usr/bin/env bash


#---------------------------------------
#-----------------------------
# Settings
#-----------------------------
#---------------------------------------

# - Is this script running on terminal ?
# -
if [[ -t 1 ]] ; then
      terminal=true
      LOGGING=true
else
   terminal=false
   LOGGING=false
fi


KILL_SIGNAL=HUP


#---------------------------------------
#-----------------------------
# Base Function(s)
#-----------------------------
#---------------------------------------

fatal(){
   echo ""
   echo -e "   [ Fatal ] $*"
   echo ""
   echo -e "\tScript terminated.."
   echo ""
   exit 1
}

error (){
   echo ""
   echo -e "   [ Error ] $*"
   echo ""
}

warn (){
   echo ""
   echo -e "   [ Warn ]  $*"
   echo ""
}

info (){
   echo ""
   echo -e "   [ Info ]  $*"
   echo ""
}

ok (){
   echo ""
   echo -e "   [ Ok ]    $*"
   echo ""
}


#---------------------------------------
#-----------------------------
# Check some prerequisites
#-----------------------------
#---------------------------------------

if [ -z "`which basename`" ]; then
   fatal 'It seems "basename" is not installed, but needed!'
fi

if [ -z "`which realpath`" ]; then
   fatal 'It seems "realpath" is not installed, but needed!'
fi

php_cgi=$(realpath $(which php-cgi) 2>/dev/null ) > /dev/null 2>&1

if [[ -z "$php_cgi" ]]; then
   if [[ -x "/usr/local/php/bin/php-cgi" ]]; then
      php_cgi="/usr/local/php/bin/php-cgi"
   else
      fatal "No 'php-cgi' binary found."
   fi
fi


#---------------------------------------
#-----------------------------
# Jobhandling 
#-----------------------------
#---------------------------------------

#LOCK_DIR=`mktemp -d`

## - Remove lockdir when the script finishes, or when it receives a signal
#trap 'rm -rf "$LOCK_DIR"' 0 2 15


#---------------------------------------
#-----------------------------
#  Checking ..
#-----------------------------
#---------------------------------------


if $LOGGING ; then
   echo -e "\nChecking for zombie processes \"$php_cgi\" on \"`hostname -f`\".."
fi
if `ps -Ao"stat,command" | grep "$(basename $php_cgi)" | grep -v grep | grep -e '^[zZ]' > /dev/null 2>&1` ; then
   warn "Found Zombie Processes \"$php_cgi\" on \"`hostname -f`\":\n"
   ps -Ao"stat,user,pid,ppid,command" | grep "$(basename $php_cgi)" | grep -v grep | grep -e '^[zZ]'
   membefore=`cat /proc/meminfo | grep Committed_AS | awk '{print $2}'`
   info "Trying a graceful kill to the concerning parents with signal \"$KILL_SIGNAL\".."
   ps -Ao"stat,pid,ppid,command" | grep "$(basename $php_cgi)" | grep -v grep | grep -e '^[zZ]' \
      | awk '{ print $3 }' | sort -u | xargs --no-run-if-empty kill -$KILL_SIGNAL
   if [ "$?" = "0" ];then
      sleep 10
      ok "Cleaning up zombie processes \"$php_cgi\" seems succsessfully finisched"
      memafter=`cat /proc/meminfo | grep Committed_AS | awk '{print $2}'`
      info "`expr $membefore - $memafter` KB RAM has been freed"
   else
      error "Cleaning up zombie processes \"$php_cgi\" failed!"
   fi
else
   if $LOGGING ; then
      ok "No zombie prossses found"
   fi
fi

exit 0