#! /bin/bash
. acsstartupAcsPorts
. acsstartupLogging.sh
. acsstartupConstants
. acsstartupProcesses
. acsstartupPids
#*******************************************************************************
# ALMA - Atacama Large Millimiter Array
# (c) Associated Universities Inc., 2002 
# (c) European Southern Observatory, 2002
# Copyright by ESO (in the framework of the ALMA collaboration)
# and Cosylab 2002, All rights reserved
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
# MA 02111-1307  USA
#
# "@(#) $Id: acsKillProc,v 1.19 2008/04/10 05:24:41 cparedes Exp $"
#
# who       when      what
# -------- ---------- ----------------------------------------------

### (2004-12-17)msc: this script only deals with a single pid, either from a pid-file
### or literally. investigating how to enhance it to deal with a list of pids,
### i found that, among other things, the invokation of "pgrep -P $TEMP_PID" below will
### need to be modified: "pgrep -P 123 456" doesn't work, it must be "pgrep -P 123,456"
### i'm writing this down so this result doesn't get lost.

########################################################################################
# These will contain the parsing results (CL_XXX, CL = command line)
CL_HELP=
CL_COMMAND=
CL_PID=
CL_PORT=

# These options can be recognized (longopts comma-separated. colon means argument is required)
LONGOPTS=help,command:,pid:,port:
SHORTOPTS=hC:p

# Usage info. Be nice and keep this up-to-date!
function printUsage 
{
    echo "This script is designed to kill a process specified from the command-line"
    echo "and any children processes it may have started. The sole command-line parameter"
    echo "to this script is either a process ID or the name of a temporary file which"
    echo "contains a process ID."
    echo ""
    echo "Sample usage could be:"
    echo "       $0 12345"
    echo "or:"
    echo "       $0 $PWD/someTempFile.pid"
    exit $EC_OK
}


# Run getopt (posixly_correct needed). We run twice:
# First run is simply to check the commandline for correctness
# Second run is the real deal which replaces the command line args with getopt's output
export POSIXLY_CORRECT=1

getopt -n `basename $0` -Q -u -a -l $LONGOPTS $SHORTOPTS "$@" || {
   printUsage
	exit $EC_BADARGS;
}

set -- `getopt -u -a -l $LONGOPTS $SHORTOPTS "$@"`

#
# Iterate over getopt's output and set CL_XXX variables accordingly
#
while : 
do
	case "$1" in
	--command)          CL_COMMAND=$2 ; shift ;;
	-C)                 CL_COMMAND=$2 ; shift ;;
	--port)             CL_PORT=$2 ; shift ;;
	--pid)              CL_PID=$2 ; shift ;;
	-p)                 CL_PID=$2 ; shift ;;
	--help)             CL_HELP=true ;; 
	-h)                 CL_HELP=true ;; 
	--) break ;;
	esac
	shift
done
shift

# restore 
export POSIXLY_CORRECT=
unset POSIXLY_CORRECT

if [ "$CL_HELP" ] ; then
   printUsage
fi

########################################################################################
#User wants to kill all commands of a certain type.
if [ "$CL_COMMAND" ]
then
    killCommand $CL_COMMAND
    exit 0

elif [ "$CL_PID" ]
then
    #Save the PID
    export TEMP_PID=$CL_PID

elif [ "$CL_PORT" ]
then
    killPort $CL_PORT
    exit $?

elif [ "$1" ]
then
    #Save the PID
    export TEMP_PID=$1
else
    #No PID or command passed!
    exit $EC_BADARGS
fi
########################################################################################
#Check to see if the PID is really the name of a temporary file containing
#the PID
if [ -r $TEMP_PID ]
then
    #The file exists and is readable...but does it contain anything???
    if [ -s $TEMP_PID ]
    then
        #so far so good. get the PID now.
	TEMP_PID=`cat $TEMP_PID`
    else
	ACS_LOG_ERROR "acsKillProc" "The file specified from the command-line '$TEMP_PID' is empty and does not contain a process ID"
	exit $EC_BADARGS
    fi
fi

killProc $TEMP_PID