[Bug libc/32103] isatty() says EIO on hung-up TTYs. Should probably say 1 instead.

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=32103

--- Comment #12 from Rich Felker <bugdal at aerifal dot cx> ---
The only way I can see it being safe to conclude from EIO that the device is a
tty is if (1) research determines that no existing drivers return -EIO for
ioctls outside their own ranges, and (2) the kernel adds a safeguard so that
non-tty drivers never see tty ioctls, so that there's no risk of this invariant
suddenly being violated by a sloppy future driver.

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