Re: Unexpected behavior of 'tail --follow=name' on special file via symlink

[Pádraig Brady]

On 31/01/2023 19:48, Glenn Golden wrote:
> Thanks, Pádraig.
>
> With the above patch (applied manually to coreutils 9.1 sources) the
> 'illegal seek' no longer occurs, but it also doesn't follow the new file:
> There is no output at all after tail announces that it is "following new file."
>
> I did verify that the "new" instance of /dev/ttyMYDEV, when observed from
> another independent process (via cat, less, more, tail, etc.) is indeed
> sinking output from the device, as expected. But tail just isn't seeing it.
>
> Also fiddled about with --sleep-interval=N (with several values of N) and
> --retry as well, but no joy.

The output from `strace tail ...` would be useful I think to help diagnose.

thanks,
Pádraig