Re: Stdio.File()->notify

I was talking about Stdio.File()->notify().

Did you remove the file using rm, or possibly with some graphical
interface? linux desktops tend to not actually remove files, but rather
move them to some kind of trashbin directory. That might explain the
missing event.

arne

On Tue, 23 Sep 2014, Pontus Ã~Vstlund wrote:

> We'll it seems to be working good enough for my purpose though.
>
> For instance when a file is renamed (the callback is called twice):
>
> Mask:   64=IN_MOVED_FROM, Cookie: 48952, File: /home/ponost/src/
> poppa.github.io/_site/oldname.pike
> Mask:  128=IN_MOVED_TO, Cookie: 48952, File: /home/ponost/src/
> poppa.github.io/_site/newname.pike
>
> One thing that doesn't seem to work is IN_DELETE. The only callback you get
> is IN_MOVED_FROM but you don't get a IN_DELETE after that, which would make
> it hard to determine if the file is about to be moved or deleted.
>
> But in this particular case I'm not so interested in what happened, just
> that something happened.
>
> # Pontus
>
>
> 2014-09-23 14:40 GMT+02:00 Arne Goedeke <[email protected]>:
>
>> Its about time it gets into stable pike releases, considering that
>> inotify was added to the linux kernel in 2005.
>>
>> I am not sure how the notify() API is supposed to be used. I think it
>> never really got finished. Anyway, as it currently exists, its not
>> usable. Even when setting up the signal handler correctly, I don't see a
>> way to decide which file object actually corresponds to the file
>> descriptor which triggered the event.
>>
>> Arne
>>
>> On Tue, 23 Sep 2014, Pontus 脋Vstlund wrote:
>>
>>  Cool! I guess Inotify is a fairly recent addition to Pike so I had to pull
>>> down Pike 8, but I got it working after that.
>>>
>>> Thanks a bunch! :)
>>>
>>> # Pontus
>>>
>>> 2014-09-23 11:20 GMT+02:00 Arne Goedeke <[email protected]>:
>>>
>>>  The second argument (a callback) is not actually used by the notify()
>>>> code. Instead, you would need  to add a signal handler. I would suggest
>>>> using System.Inotify, it should work as documented and is much more
>>>> flexible.
>>>>
>>>> So, no, you are not doing anything wrong. notify() is not documented
>>>> correctly and should probably be removed completely.
>>>>
>>>> Arne
>>>>
>>>>
>>>> On Tue, 23 Sep 2014, Pontus 鐛竀stlund wrote:
>>>>
>>>>  Hello!
>>>>
>>>>>
>>>>> I have a question about the notify method in Stdio.File which I can't
>>>>> get
>>>>> to work. Maybe I'm using it wrong or maybe it just doesn't work, I don't
>>>>> know.
>>>>>
>>>>> I'd like to listen for changes in a directory:
>>>>>
>>>>> Stdio.File dir = Stdio.File("/my/dir");
>>>>> dir->notify(
>>>>>    Stdio.DN_MULTISHOT |
>>>>>    Stdio.DN_MODIFY |
>>>>>    Stdio.DN_CREATE |
>>>>>    Stdio.DN_DELETE |
>>>>>    Stdio.DN_RENAME,
>>>>>    lambda() {
>>>>>        werror("Hello\n");
>>>>>    }
>>>>> );
>>>>>
>>>>> but nothing seems to happen. Am I doing something wrong?
>>>>>
>>>>> And yes, I'm using Linux.
>>>>>
>>>>> Regards
>>>>> # Pontus
>>>>>
>>>>>
>>>>
>