tail -f: --pid *and* inotify

[Jim Meyering]

Hi Giuseppe,

I've realized that there is a good way to remove the ugly exclusion
that currently disables inotify-based tail -f when --pid is specified.
Instead of the existing while-1-loop around code that reads the inotify
FD, we can use a loop that polls that single FD with a 1-2-second timeout.
Then, it can periodically run the usual PID-alive check.
Are you interested in doing that?

Between this, the ls -1U bug, and the btrfs O(1) copy,
I'm now expecting to defer the release by at least a week.