[Bug 266627] stty -f <file> should be non-blocking

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266627

--- Comment #9 from Konstantin Belousov <kib@FreeBSD.org> ---
I think I have an idea that makes your case workable:

root@:/ # stty -i -f /dev/tty sane &
root@:/ # 

[1]   Done                    stty -i -f /dev/tty sane
root@:/ # 

Note the new '-i' option, which makes stty not block when in background,
without kernel patch.  In fact it would not block even if using blocking fd.

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