[fdo] Detect my own session being closed

[Sergio Costas]

The problem is that I don't want to have a system service, because I 
would also need a communication protocol, an arbitration algorithm... I 
think that there should be an API in logind that would allow a program 
to block the logout the same than it allows to block shutdown and 
reboot, and being notified of that. In fact, sometimes I receive a 
notification in Gnome Shell telling me that Thunderbird is still running 
and can't close the session... How can I do that? (if it also allows me 
to detect it and do what I want, of course).

El 6/2/20 a las 6:49, Ryan escribió:
> I think what you really want is a system service that talks to your 
> backup app. That way, it can run across user sessions, thus being able 
> to detect session opening, leaving, etc.
>
> On Wed, Feb 5, 2020, 10:55 AM Rastersoft <rastersoft at gmail.com 
> <mailto:rastersoft at gmail.com>> wrote:
>
>     Hello:
>
>     I created a backup program that uses an external HD to do the
>     backups, and it is designed to allow several users to share the
>     same hard disk by storing each backup in a different folder. To
>     ensure that the backups are always made, it automatically mounts
>     the backup hard disk when it detects it (using udisk2 DBus
>     interface). The first problem is that if the backup program of the
>     user A mounts the disk, only user A can access it. The second
>     problem is that, if user closes its session as user A and opens a
>     new session as user B, the external hard disk is still mounted as
>     the user A, so the backup program of user B can't access it unless
>     user B manually unmounts it.
>
>     My questions are:
>
>     - Is it possible to mount an external hard disk, using udisk2,
>     making it accessible for all the users?
>     - If not, is it possible to mark a mounted partition as "umount on
>     session close"?
>     - If not, is it possible to detect when my session is being
>     closed, to make the backup program to umount the partition, thus
>     allowing other users to use it?
>
>     About this last question: I already tried to connect to the
>     SessionRemoved signal from logind, but with no luck: I receive the
>     signal when other users close their session, but my program is
>     killed before it can process the signal. Also I tried to use
>     onexit(), atexit(), and GApplication's close signals, but also
>     with no luck: the code isn't called (I'm using GTK, and the
>     program always dies with a 'broken pipe' message when the session
>     is closed).
>
>     Thanks in advance.
>
>     -- 
>     Nos leemos
>                      RASTER    (Linux user #228804)
>     raster at rastersoft.com <mailto:raster at rastersoft.com>
>     http://www.rastersoft.com
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>

-- 
Nos leemos
		         RASTER    (Linux user #228804)
raster at rastersoft.com              http://www.rastersoft.com

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