Hi Emilio, On Dec 9, 2013 6:38 AM, "Emilio Pozuelo Monfort" <<a href="mailto:pochu27@gmail.com">pochu27@gmail.com</a>> wrote: > > Hi, > > I was looking at making gtk+ try the wayland backend before the x11 one [1]. > This would solve the problem where every gtk+ app uses the x11 backend through > XWayland when the latter is available. > > As you can read on comment #3 and in the patch from comment #1, > wl_display_connect() currently falls back to wayland-0 if WAYLAND_DISPLAY is not > in the environment, which causes the wayland backend initialization to succeed > when running from X11 while weston is running (whether in a different tty or in > an X11 window). > > The workaround I'm using in gtk+ is to directly fail the wayland backend > initialization if WAYLAND_DISPLAY is not set, as Pekka suggested to me. This > works nicely, making gtk+ apps use the x11 backend when launched from within > X11, and use the wayland backend when started within weston. > > So my question is: why are we falling back to wayland-0 when WAYLAND_DISPLAY > isn't set? Is this so that one can easily/quickly run apps from a tty for > debugging purposes? Why do we have a fallback? I don't know. It doesn't seem that hard to just set WAYLAND_DISPLAY if you want to run from another terminal. Why is the fallback wayland-0? I think that's the obvious choice? How do you work around it? What you got from Pekka is half right. You need to check for both WAYLAND_DISPLAY and WAYLAND_SOCKET. The former is the catch-all "connect to this socket; it lives in XDG_RUNTIME_DIR." The other is a mechanism for passing the client a specific file descriptor that it is expected to use for it's connection. This is usually used for launching trusted clients such as the panel. Hope that helps, --Jason Ekstrand > > Cheers, > Emilio > > [1] <a href="https://bugzilla.gnome.org/show_bug.cgi?id=719989">https://bugzilla.gnome.org/show_bug.cgi?id=719989</a> > _______________________________________________ > wayland-devel mailing list > <a href="mailto:wayland-devel@lists.freedesktop.org">wayland-devel@lists.freedesktop.org</a> > <a href="http://lists.freedesktop.org/mailman/listinfo/wayland-devel">http://lists.freedesktop.org/mailman/listinfo/wayland-devel</a>