Re: feature/android b91e8ada70e 3/5: Fix auto-revert-mode on Android

[Michael Albinus <michael.albinus@gmx.de>]

Po Lu <luangruo@yahoo.com> writes:

Hi,

>> I have two problems with this patch. First, nil is not defined as return
>> value of *-add-watch functions. If we want to allow this, we must extend
>> the interface.
>>
>> Second, do we really want to have such a hard coded list in inotify.c?
>> What about other directories on other systems, like "/proc"? Shouldn't
>> we add rather a common interface for excluding directories from being
>> watched, say file-notify-excluded-directories (a list of strings)? This
>> could be modified on Lisp level, no need to do it in the notification
>> backends.
>
> Shouldn't watching /proc work, in that no error is signalled, unlike
> watching /content and /assets, which are wholly inventions of android.c
> which do not exist in the VFS?

I haven't checked /proc, it was just the first example which came to
mind for a directory we might want to exclude. Other examples might be
mounted directories, which could also fail for watching files.

> Anyway, what return value do you think would be appropriate here?

nil might be a correct return value. We haven't simply specified it, and
implementing a file-notify-excluded-directories would give the backends
a simple way to achive the goal, w/o modifying C source.

> Thanks.

Best regards, Michael.