1. clear out environment as best is possible before executing
anything. especially PATH and IFS are set to minimal base defaults.
also use clearenv() if available and unsetenv()
2. remove gdb method as it's just too dangerous. run it as normal as
the user and if the kernel / distro dny that - then sorry. too bad.
This use a custom implementation of l2ping to ping known device and do
proper action when they go away. I don't recommend to use the auto unlonck,
but it is there if someone need it.