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Revert "client: require WAYLAND_DISPLAY to be set"

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This reverts commit fb7e130217.

Developers have been trying to reduce the number of by default required
environment variables, and the mentioned commit is a step backwards in
that sense. The fundamental assumption is that a user has only one main
(Wayland) display server where all programs should connect to by
default, and do so with an a priori known socket name.

The commit also broke various use cases in the wild, some accidentally
due to other causes, some intentionally. This revert allows those use
cases to continue.

The original problem of running Weston in a window in an existing GNOME
X11 session and getting applications unintentionally launched into
Weston can be circumvented by letting Weston use a non-default socket
name, leaving wayland-0 unused.

Discussion:
http://lists.freedesktop.org/archives/wayland-devel/2015-August/023927.html
http://lists.freedesktop.org/archives/wayland-devel/2015-August/023937.html

Cc: Dima Ryazanov <dima@gmail.com>
Cc: Giulio Camuffo <giuliocamuffo@gmail.com>
Cc: Daniel Stone <daniel@fooishbar.org>
Cc: Jasper St. Pierre <jstpierre@mecheye.net>
Cc: Ryo Munakata <ryomnktml@gmail.com>
Cc: Ray Strode <halfline@gmail.com>
Cc: Peter Hutterer <peter.hutterer@who-t.net>
Cc: Matthias Clasen <mclasen@redhat.com>
Cc: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Acked-by: Ray Strode <rstrode@redhat.com>
Acked-by: Dima Ryazanov <dima@gmail.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Acked-By: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-By: Ryo Munakata <ryomnktml@gmail.com>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Pekka Paalanen 2015-08-17 15:20:28 +03:00
parent c0636ddcac
commit c7dbaa1cfd
3 changed files with 11 additions and 12 deletions
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5
doc/man/wl_display_connect.xml
View file

@ -57,8 +57,9 @@
that was previously opened by a Wayland server. The server socket must
be placed in <envar>XDG_RUNTIME_DIR</envar> for this function to
find it. The <varname>name</varname> argument specifies the name of
the socket or <constant>NULL</constant> to use the default
(which is the value of <envar>WAYLAND_DISPLAY</envar>). If
the socket or <constant>NULL</constant> to use the default (which is
<constant>"wayland-0"</constant>). The environment variable
<envar>WAYLAND_DISPLAY</envar> replaces the default value. If
<envar>WAYLAND_SOCKET</envar> is set, this function behaves like
<function>wl_display_connect_to_fd</function> with the file-descriptor
number taken from the environment variable.</para>