#!/bin/sh

if [ "`id -u`" != "0" ]; then
 echo "You must be root to use this program!"
 exit 0
fi

if ! test -x /usr/bin/gdb; then
  echo "gdb (package gdb, series d) must be installed before running this program!"
  exit 0
fi

# It is recommended to also have installed the following debuginfo packages:
#  xorg-x11-libXau-debuginfo
#  xorg-x11-libXdmcp-debuginfo
#  xorg-x11-libs-debuginfo
#  xorg-x11-driver-video-debuginfo
#  xorg-x11-driver-input-debuginfo
#  xorg-x11-server-debuginfo

tmpfile=`mktemp /tmp/xf86debug.XXXXXXXXXX`

# generate core file
ulimit -c unlimited
corefile=`mktemp /tmp/core.Xorg.XXXXXXXXXX`

echo -n "Starting X Server in Debugger ... "
gdb << EOF &> $tmpfile
file  /usr/bin/Xorg
set args ${1+"$@"}
handle SIGUSR1 nostop
run
generate-core-file $corefile
bt full
quit
EOF
echo "done"

echo "Debugger output written to $tmpfile." 
if [ -s $corefile ]; then
  echo "Core file written to $corefile."
else
  rm $corefile
fi