Re: Stdio.File()->notify

That is the purpose of this mailing list ;)

arne

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

> *Facepalm*
>
> There are many things in Pike you forget/don't know exist, especially the
> more esoteric stuff you don't use on a daily basis.
>
> Thank you, that will make things a bit cleaner I think :)
>
> # Pontus
>
> 2014-09-23 16:18 GMT+02:00 Arne Goedeke <[email protected]>:
>
>> Inotify internally works on inodes (hence inotify), so it handles only
>> directories and files. Check out Filesystem.Monitor, it should do most
>> of the abstraction you need. It uses inotify or FSEvents, if available.
>> Otherwise it falls back to periodically scanning for changes.
>>
>> Arne
>>
>>
>> On Tue, 23 Sep 2014, Pontus Ã~Vstlund wrote:
>>
>>  Ok, I misunderstood you. I was talking about Inotify.
>>>
>>> You're probably correct. I deleted the file via Nautilus which would put
>>> it
>>> in the thrash bin.
>>>
>>> One thing though: System.Inotify doesn't seem to work recursively on a
>>> directory. I don't know the internals of inotify and if it's also meant to
>>> watch all subdirectories. In my case i could create a wrapper that creates
>>> a watcher for all subdirectories as well, and maybe that's the way you
>>> have
>>> to do it?
>>>
>>> # Pontus
>>>
>>> 2014-09-23 15:33 GMT+02:00 Arne Goedeke <[email protected]>:
>>>
>>>  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
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>