setting close_on_exec for archetype. * fhandler_tty.cc (fhandler_pty_master::setup): Protect {from,to}_pty handles. Use consistent naming in debug output. Use inheritable handles and... (fhandler_pty_master::fixup_after_fork): ...avoid duplicating handles here. (fhandler_pty_slave::open): Don't set close_on_exec flag here.
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