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

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

--- Comment #4 from Nikolay Borodin <monsterovich@gmail.com> ---
(In reply to Kyle Evans from comment #3)
> though you can destroy it, you just have to close it first

You can't. If you try to do this via SIOCIFDESTROY inside an application which
uses the descriptor, the application will hang, even if you do ioctl after
close(fd)

The sample code from my application:

JFUNC(void, close) {
    close(getFd(env, this));

    struct ifreq ifr;
    memset(&ifr, 0, sizeof(ifr));
    strcpy(ifr.ifr_name, "tap0");
    int sock = socket(PF_INET, SOCK_STREAM, 0);
    ioctl(sock, SIOCIFDESTROY, &ifr); // hangs
}

After that, you can only terminate the application via kill -9 <pid>.

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