Restore default action for all ignored signals except SIGTTOU.
Restore default action for all ignored signals except SIGTTOU.

Restoring SIGTTOU hides output of a foreground process but
shows output of a background process. This is something that
is not very clear to me, thus has been ignored for now.

This blog post sheds some light
http://curiousthing.org/sigttin-sigttou-deep-dive-linux but I am
not totally convinced that the problem is what it talks about.

indradhanush/rc-shell,indradhanush/rc-shell