Expose surface's client to QML

Introduce QWaylandClient class that wraps wl_client credentials
and has a method to destroy the client.

Add QWaylandClient object as a QWaylandSurface property.

This come in handy for example when the compositor wants to kill the
process of an unresponsive surface or wants to know client credentails.

WaylandClient typedef is now useless thus is replaced by QWaylandClient.

Change-Id: I997ec459af0f19baef67e7420c90937b197b2e1d
Reviewed-by: Giulio Camuffo <giulio.camuffo@jollamobile.com>

1 files changed, 175 insertions, 0 deletions

diff --git a/src/compositor/compositor_api/qwaylandclient.cpp b/src/compositor/compositor_api/qwaylandclient.cpp
new file mode 100644
index 000000000..74193ee60
--- /dev/null
+++ b/src/compositor/compositor_api/qwaylandclient.cpp
@@ -0,0 +1,175 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Compositor.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qobject_p.h>
+
+#include "wayland_wrapper/qwlcompositor_p.h"
+#include "qwaylandcompositor.h"
+#include "qwaylandclient.h"
+
+#include <wayland-util.h>
+
+QT_BEGIN_NAMESPACE
+
+class QWaylandClientPrivate : public QObjectPrivate
+{
+public:
+    QWaylandClientPrivate(wl_client *_client)
+        : client(_client)
+    {
+        // Save client credentials
+        wl_client_get_credentials(client, &pid, &uid, &gid);
+    }
+
+    ~QWaylandClientPrivate()
+    {
+    }
+
+    static void client_destroy_callback(wl_listener *listener, void *data)
+    {
+        Q_UNUSED(data);
+
+        QWaylandClient *client = reinterpret_cast<Listener *>(listener)->parent;
+        Q_ASSERT(client != 0);
+        QtWayland::Compositor::instance()->m_clients.removeOne(client);
+        delete client;
+    }
+
+    wl_client *client;
+
+    uid_t uid;
+    gid_t gid;
+    pid_t pid;
+
+    struct Listener {
+        wl_listener listener;
+        QWaylandClient *parent;
+    };
+    Listener listener;
+};
+
+QWaylandClient::QWaylandClient(wl_client *client)
+    : QObject(*new QWaylandClientPrivate(client))
+{
+    Q_D(QWaylandClient);
+
+    // Destroy wrapper when the client goes away
+    d->listener.parent = this;
+    d->listener.listener.notify = QWaylandClientPrivate::client_destroy_callback;
+    wl_client_add_destroy_listener(client, &d->listener.listener);
+}
+
+QWaylandClient::~QWaylandClient()
+{
+    Q_D(QWaylandClient);
+
+    // Remove listener from signal
+    wl_list_remove(&d->listener.listener.link);
+}
+
+QWaylandClient *QWaylandClient::fromWlClient(wl_client *wlClient)
+{
+    if (!wlClient)
+        return 0;
+
+    QWaylandClient *client = Q_NULLPTR;
+
+    wl_listener *l = wl_client_get_destroy_listener(wlClient,
+        QWaylandClientPrivate::client_destroy_callback);
+    if (l)
+        client = reinterpret_cast<QWaylandClientPrivate::Listener *>(
+            wl_container_of(l, (QWaylandClientPrivate::Listener *)0, listener))->parent;
+
+    if (!client) {
+        // The original idea was to create QWaylandClient instances when
+        // a client bound wl_compositor, but it's legal for a client to
+        // bind several times resulting in multiple QWaylandClient
+        // instances for the same wl_client therefore we create it from
+        // here on demand
+        client = new QWaylandClient(wlClient);
+        QtWayland::Compositor::instance()->m_clients.append(client);
+    }
+
+    return client;
+}
+
+wl_client *QWaylandClient::client() const
+{
+    Q_D(const QWaylandClient);
+
+    return d->client;
+}
+
+qint64 QWaylandClient::userId() const
+{
+    Q_D(const QWaylandClient);
+
+    return d->uid;
+}
+
+qint64 QWaylandClient::groupId() const
+{
+    Q_D(const QWaylandClient);
+
+    return d->gid;
+}
+
+qint64 QWaylandClient::processId() const
+{
+    Q_D(const QWaylandClient);
+
+    return d->pid;
+}
+
+void QWaylandClient::kill(int sig)
+{
+    Q_D(QWaylandClient);
+
+    ::kill(d->pid, sig);
+}
+
+void QWaylandClient::close()
+{
+    Q_D(QWaylandClient);
+
+    QtWayland::Compositor::instance()->waylandCompositor()->destroyClient(this);
+}
+
+QT_END_NAMESPACE