screen-share: Add screen-share command to weston.ini man page

This adds a description of the screen-share command configuration key to the
weston.ini man page.

[Pekka Paalanen: removed the sentence about default value, because the
default value is empty, and AFAIU cannot work.]

Signed-off-by: Andrew Wedgbury <andrew.wedgbury@realvnc.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
weston-test: check if resource is not NULL

and post client_no_memory if is...

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
xdg-shell: bump experimental protocol version

The experimental versioning has not been updated when it was supposed
to. Let's try to be better at it now, as xdg-shell is close to have its
first stable version.

Bump the version now to bring the world into the same exact version.

There may be some protocol changes still coming, but we try to land them
before 1.6 gets out. Those changes will bump the experimental version
again as needed.

When 1.6.0 is released, the experimental version will no longer be
bumped, and no incompatible protocol changes will be made. Xdg-shell.xml
file will move to Wayland in 1.7.0, drop the experimental versioning,
and become stable.

Cc: Jasper St. Pierre <jstpierre@mecheye.net>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
build: use AM_DISTCHECK_CONFIGURE_FLAGS

According to
http://www.gnu.org/software/automake/manual/html_node/Checking-the-Distribution.html
the DISTCHECK_CONFIGURE_FLAGS is for the user, while
AM_DISTCHECK_CONFIGURE_FLAGS is the one to use in Makefile.am.

Make it so.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Boyan Ding <stu_dby@126.com>
Reviewed-by: Marek Chalupa <mchqwerty@gmail.com>
build: do not run xwayland test for distcheck

The Xwayland test has been broken ever since the migration to the
stand-alone Xwayland server binary.

Disable the test, so 'make distcheck' can actually run.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Boyan Ding <stu_dby@126.com>
tests: allow running make check without make install

desktop shell and weston keyboard both refer to themselves prefixed by
LIBEXECDIR, however this is only valid once installed.  make check will
currently either fail or run pre-existing versions.

This patch adds a way to override that location by setting the env var
WESTON_BUILD_DIR - which is then set by the test env script so make check
will test the versions in the build directory regardless of whether they're
installed or not.

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
configure.ac: Bump version to 1.5.91 for the alpha release

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
configure.ac: require libwayland 1.5.91

Compositor needs the wl_surface error enums and the keyboard repeat info
protocol added in 1.5.91.

weston-info, window.c, and Weston's wayland backend need also the
keyboard repeat info.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
xwayland: Clean up the WM properly if X server crashes

The X cleanup code uses wxs->wm to check if the WM has been created - but that
variable was never initialized. So if X crashes, the WM doesn't get destroyed,
causing a crash when it tries to repaint a window.

Signed-off-by: Dima Ryazanov <dima@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
protocol: fix a wrong word in wl_viewport.set_source

Obvious this affects the source, not destination.

Reported-by: Jasper St. Pierre <jstpierre@mecheye.net>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
desktop-shell: Replace magic constants with named ones

Signed-off-by: Ondřej Majerech <majerech.o@gmail.com>
Reviewed-by: Nils Chr. Brause <nilschrbrause@gmail.com>
Document output/scale configuration option in the weston.ini man page.

v2: Different, hopefully better, wording. This patch entirely replaces
the previous similar patch I sent.

v3: Now including the correct patch. Please disregard the "v2" mail.

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
window: unbind egl surface and context on surface release

Binding null read and write surfaces to an egl context is not standard

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
nested: add missing egl extension declaration

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
desktop-shell: fix invalid memory access when shell execution fails

In this case wl_client_add_destroy_listener() was called with a NULL
client, which is invalid.

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
wm: Don't subtract the margins from the configured size

When we moved the configure event size to being based on the window
geometry, we changed the coordinates of the configure request to being
frame geometry based. Frame geometry includes titlebar and border, but
not shadow margins.

Tested-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
compositor: add weston_client_start()

weston_client_start() is a new wrapper around weston_client_launch(),
that does the process tracking on its own, and logs the process exit
status.

When users of weston_client_start() want to know when the process exits,
they should hook into the wl_client destroy signal. This works for cases
where the client is not expected to disconnect without exiting.

As wl_client destructor and the sigchld handler run in arbitary order,
it is usually difficult for users to maintain both struct weston_process
and a struct wl_client pointer. You would need to wait for both
destructor and handler to have run, before attempting to respawn the
client.

This new function relieves the caller from the burden of maintaining the
struct weston_process, assuming the caller is only interested in client
disconnects.

Cc: Boyan Ding <stu_dby@126.com>
Cc: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
shell: fix race on desktop-shell exit

The desktop shell plugin registers both a wl_client destroy signal
listener, and a sigchld handler, when launching weston-desktop-shell.
However, nothing guarantees in which order do the wl_client destructor
and the sigchld handler run.

Luckily, the sigchld handler cannot interrupt any code, because we
handle the signal via signalfd, which means it is handled like any event
in the compositor's main event loop.

Still, shell.c has a race, that when lost, can cause a crash, as
described in bug #82957.

If the sigchld handler happens to run first, it will try to launch a new
weston-desktop-shell without removing the destroy listener from the old
wl_client first. This leads to list corruption, that may cause a crash
when the old wl_client gets destroyed.

Simply removing the destroy listener in the sigchld handler is not
enough, because respawning sets shell->child.client pointer, and if
the wl_client destructor runs after, it will reset it to NULL.

OTOH, the wl_client destroy handler cannot reset shell->child.process,
because that would cause the sigchld handler in weston core to not find
the process tracker anymore, and report that an unknown process exited.

Turns out, that to make everything work, we would need to wait for both
the wl_client destructor and the sigchld handler to have run, before
respawn. This gets tricky.

Instead, solve the problem by removing shell->child.process. Use the new
weston_client_start() which automatically creates and manages the struct
weston_process. The shell does not need to know about the process exit,
it only needs to know about the client disconnect. Weston-desktop-shell
will never attempt to reconnect, and it would not work even if it did,
so disconnect is equivalent to weston-desktop-shell exiting.

This should permanently solve the race for weston-desktop-shell.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=82957
Cc: Boyan Ding <stu_dby@126.com>
Cc: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
compositor: leave no zombie behind

When SIGCHLD fires, we may have more than one zombie to be collected.
Run waitpid() in a loop until no more zombies are found, and clean them
all up.

It looks like the SIGCHLD signalfd does not trigger again for remaining
zombies, so we need the loop.

This works around a crash in text_backend_notified_destroy, which ends
up using stale input_method.client if the sigchld handler is not called.
The crash could be triggered by removing both weston-desktop-shell and
weston-keyboard, so that both would try to respawn and give up, and then
quitting Weston.

Cc: rawoul@gmail.com
Cc: Boyan Ding <stu_dby@126.com>
Cc: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
simple-shm: remove an unnecessary call of wl_display_get_fd()

Reviewed-by: Nils Chr. Brause <nilschrbrause@gmail.com>