Detect new available names in bus

[Sergio Costas]

Hi:

El 15/2/22 a las 13:58, Ralf Habacker escribió:
> Am 15.02.22 um 11:35 schrieb Sergio Costas:
>> Which confirms that the dbus daemon is already monitoring those 
>> folders (both with inotify for linux and kqueue for BSD), so adding 
>> that dbus signal sould be quite straightforward...
>>
>> So... How much complex is to submit a proposal for modifying the 
>> specification...?
>>
>
> Have you checked 
> https://dbus.freedesktop.org/doc/dbus-specification.html to see if 
> there is already a signal that meets your requirements?
>
> A quick look shows me that these may be usable here:
>
> org.freedesktop.DBus.NameOwnerChanged - This signal indicates that the 
> owner of a name has changed. It's also the signal to use to detect the 
> appearance of new names on the bus.
>
> org.freedesktop.DBus.NameLost - This signal is sent to a specific 
> application when it loses ownership of a name.
>
> org.freedesktop.DBus.NameAcquired - This signal is sent to a specific 
> application when it gains ownership of a name. 

As I commented in a previous message, I already checked all those. 
NameLost and NameAcquired seems to be emitted only to the current owner 
of the name, to notify that it has successfully acquired a name or if 
some other service "stole" it. I connected to them but don't receive any 
signal, no matter that I install or uninstall the files, launch or kill 
de daemon...

About NameOwnerChanged, it only notifies when a daemon actually acquires 
a name, but that requires it to be launched. This means that an 
activatable service won't emit that unless any of their methods is 
called, thus loading the daemon. Again, that's not what I need. What I 
need is to detect when the .service file is added or removed.

-- 

Nos leemos
		         RASTER    (Linux user #228804)
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