#!/bin/sh
# $Id: ast_grab_core 197824 2009-05-28 21:50:27Z seanbright $
# lame quickie script to snarf a core of a hung asterisk process.
# bugs to ast_grab_core, blinky-lights.org  (derrick daugherty)

# we have found that gcore doesn't yield as useful a core file
# as that yielded by a signal-caused core dump. So we are going to change
# the strategy to sending a SEGV signal to the asterisk process,
# and have it 'burn to the ground', leaving behind a core file.
# the main difference is that you cannot control where the
# core file will end up. We will assume that safe_asterisk was
# used to start asterisk, and the core file should therefore end
# up in /tmp (because safe_asterisk cd's there before starting asterisk).
# if this is not the case, set DUMPDIR to the place where the core
# file can be found.

DATE=`date +%Y%m%d%H%M`
DUMPDIR=/tmp
HOSTNAME=`hostname`
ADMINEMAIL="root@localhost"

#the following should be improved
if [ -e /etc/asterisk/asterisk.conf ]; then
	RUNDIR=`awk -F"=>" '/astrundir/ {print $2}' /etc/asterisk/asterisk.conf`
	PID=`cat ${RUNDIR}/asterisk.pid`
elif [ -e /var/run/asterisk.pid ] ; then 
	PID=`cat /var/run/asterisk.pid`
else 
	echo Could not find an asterisk.conf definition for astrundir,  using \'ps\'
	echo to try and determine process ID.  This is not reliable.
	PID=`ps auxwf|grep asterisk|grep vv|head -1|awk '{print $2}'`
fi

echo Snarfing asterisk core, this could take a few seconds depending
echo on how much memory is in use.
echo
echo \*\*\* WARNING \*\*\*  If the system is not already locked this will cause the 
echo \*\*\* WARNING \*\*\*  process to STOP while memory is dumped to disk.
echo

/bin/kill -11 ${PID}

echo Snarfed!  ${DUMPDIR}/core.${PID}
echo


echo Trying for a backtrace of the captured core.
/usr/bin/gdb /usr/sbin/asterisk ${DUMPDIR}/core.${PID} > ${DUMPDIR}/gdb_dump.${PID}.txt 2> /dev/null << EOF
set prompt \n
set print pretty\n
echo --------------------------------------------------------------------------------\n
echo INFO THREAD
info thread
echo --------------------------------------------------------------------------------\n
echo THREAD APPLY ALL BT
thread apply all bt
echo --------------------------------------------------------------------------------\n
echo THREAD APPLY ALL BT FULL
thread apply all bt full
quit
EOF
echo Done trying for a bt.


echo Notifying admins of the core.
/usr/bin/mail -s "${HOSTNAME} core dumped at ${DUMPDIR}/core.${PID}" ${ADMINEMAIL} < ${DUMPDIR}/gdb_dump.${PID}.txt
echo Done.
echo
echo Reproducible deadlocks should be posted with a full backtrace and instructions
echo to reproduce the issue at https://issues.asterisk.org/    Thanks!
