[Bug 277435] [Feature request] Add an option to destroy the tap/tun interface when the descriptor is closed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277435

--- Comment #9 from Nikolay Borodin <monsterov...@gmail.com> ---
(In reply to Kyle Evans from comment #8)

After this option is set, the system hangs when the application is closed.

i = 1;
if (ioctl(fd, TAPSTRANSIENT, &i) < 0) {
    printf("error: ioctl(TAPSTRANSIENT)\n"); // hangs
    return 1;
}

with a 100% CPU load:

> 1503846 monster+  20   0 3583480 610420 494700 S 100,0   1,9   1:21.39 
> VirtualBoxVM

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