specify O_ClOLEXEC explicitly. The change from os.OpenFile to unix.Open
specify O_ClOLEXEC explicitly. The change from os.OpenFile to unix.Open

removed this flag, and now child processes hold the tun device open
after the parent/createor exits. For example when ep-control exits,
tun0 sticks around because of the child processes created by ep-control
configuration code.

mistsys/tuntap,mistsys/tuntap