Re: Stdio.File()->notify

*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
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>