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Re: [Lxde-list] Try to make a conclusion for lxsession-logout and screen locking.
So here is the design choice.
To implement locking program detection in script and depends on
dbus-send, or to implement this in C code to have no other
dependencies since we already use dbus?
Maybe this time doing it in C can make things easier than using scripts.
On Wed, Sep 15, 2010 at 5:26 AM, Guido Berhoerster
> * PCMan <pcman.tw@xxxxxxxxx> [2010-09-14 22:46]:
>> On Wed, Sep 15, 2010 at 4:19 AM, Guido Berhoerster
>> <guido+sourceforge.net@xxxxxxxxxxxxxxxx> wrote:
>> > * PCMan <pcman.tw@xxxxxxxxx> [2010-09-14 15:48]:
>> >> > No, running "gnome-screensaver-command -l" without
>> >> > gnome-screensaver running will print
>> >> > **Message: Screensaver is not running!
>> >> > and return exit code 1.
>> >> This is not the case on my box.
>> >> It tried to launch gnome-screensaver even if this command failed.
>> >> I'm using ubuntu 10.04.
>> >> Please read the source code of gnome-screesaver-command.
>> >> Is doesn't do what you said.
>> >> http://git.gnome.org/browse/gnome-screensaver/tree/src/gnome-screensaver-command.c
>> >> It exit with code 1 only when you pass wrong arguments, when dbus is
>> >> not available, and when you query the version number.
>> >> It return 0 even if gnome-screensaver is not running.
>> >> The dbus call, however, will cause the gnome-screensaver service being launched.
>> >> I don't know the version of gnome-screensaver you're using, but from
>> >> the latest code in git, it doesn't not work the way we want.
>> > I admit you are right on this one, the DBus autostart seems to
>> > have been introduced in April:
>> > http://git.gnome.org/browse/gnome-screensaver/commit/?id=47155576403fea9339a1f702e3dc63455b763fb8
>> > They more or less silently changed the behavior of
>> > gnome-screensaver-command breaking shell scripts (including one
>> > of mine for inhibiting the screensaver while running an
>> > application) relying on the previous behavior which was modeled
>> > after xscreensaver-command, just lovely.
>> Since they do things with the dirty way, here is a dirty solution I
>> came up with.
>> dbus-send --session --type=method_call --print-reply
>> --dest=org.freedesktop.DBus / org.freedesktop.DBus.NameHasOwner
>> Maybe this command line can do the trick.
> The problem is that dbus-send might not necessarily be installed
> even when dbus itself is.
>> > If someone has gnome-screensaver installed and is running another
>> > screensaver I don't see any way to tell from a shellscript which
>> > one to use now. Looking for a process is just plainly broken and
>> > unreliable by principle, e.g. someome might suspend before the
>> > session has started gnome-screensaver, see
>> > https://bugzilla.gnome.org/show_bug.cgi?id=616225
>> But this should be a rare case. Maybe we should ask gnome-screensaver
>> developers how to solve this.
> I think that is the proper solution.
> Guido Berhoerster