if false; then
sudo sh -c '
	mkdir /tmp/corefiles 
	chmod 777 /tmp/corefiles 
	echo "/tmp/corefiles/core" >/proc/sys/kernel/core_pattern 
	echo 1 >/proc/sys/kernel/core_uses_pid
'
fi

ulimit -c 100000000
gcc -o segv -ggdb segv.c
./segv
gdb segv core

if false; then
sudo sh -c '
	echo "core" >/proc/sys/kernel/core_pattern 
	echo 0 >/proc/sys/kernel/core_uses_pid
'
fi