Add support for opening LinuxInput devices exclusively ('grabbing').

The LinuxInput stack exposes the ioctl EVIOCGRAB which allows LinuxInput devices
being opened exclusively ('grabbed'). This patch adds support for configuring
how Qt should treat LinuxInput devices (via the 'grab'-argument).
By default devices are not grabbed, so not opened exclusively (matches prior
behaviour). This however means all input (keystrokes, etc.) is passed to other
applications (shells/ttys included) accessing respective device(s) as well.

Merge-request: 2637
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

2 files changed, 15 insertions, 2 deletions

diff --git a/src/gui/embedded/qkbdlinuxinput_qws.cpp b/src/gui/embedded/qkbdlinuxinput_qws.cpp
index 376b0d0..b2e7cb3 100644
--- a/src/gui/embedded/qkbdlinuxinput_qws.cpp
+++ b/src/gui/embedded/qkbdlinuxinput_qws.cpp
@@ -103,6 +103,7 @@ QWSLinuxInputKbPrivate::QWSLinuxInputKbPrivate(QWSLinuxInputKeyboardHandler *h,
     QString dev = QLatin1String("/dev/input/event1");
     int repeat_delay = -1;
     int repeat_rate = -1;
+    int grab = 0;
 
     QStringList args = device.split(QLatin1Char(':'));
     foreach (const QString &arg, args) {
@@ -110,12 +111,15 @@ QWSLinuxInputKbPrivate::QWSLinuxInputKbPrivate(QWSLinuxInputKeyboardHandler *h,
             repeat_delay = arg.mid(13).toInt();
         else if (arg.startsWith(QLatin1String("repeat-rate=")))
             repeat_rate = arg.mid(12).toInt();
+        else if (arg.startsWith(QLatin1String("grab=")))
+            grab = arg.mid(5).toInt();
         else if (arg.startsWith(QLatin1String("/dev/")))
             dev = arg;
     }
 
     m_fd = QT_OPEN(dev.toLocal8Bit().constData(), O_RDWR, 0);
     if (m_fd >= 0) {
+        ::ioctl(m_fd, EVIOCGRAB, grab);
         if (repeat_delay > 0 && repeat_rate > 0) {
             int kbdrep[2] = { repeat_delay, repeat_rate };
             ::ioctl(m_fd, EVIOCSREP, kbdrep);
diff --git a/src/gui/embedded/qmouselinuxinput_qws.cpp b/src/gui/embedded/qmouselinuxinput_qws.cpp
index 19a9a99..5b4f664 100644
--- a/src/gui/embedded/qmouselinuxinput_qws.cpp
+++ b/src/gui/embedded/qmouselinuxinput_qws.cpp
@@ -43,6 +43,7 @@
 
 #include <QScreen>
 #include <QSocketNotifier>
+#include <QStringList>
 
 #include <qplatformdefs.h>
 #include <private/qcore_unix_p.h> // overrides QT_OPEN
@@ -101,11 +102,19 @@ QWSLinuxInputMousePrivate::QWSLinuxInputMousePrivate(QWSLinuxInputMouseHandler *
     setObjectName(QLatin1String("LinuxInputSubsystem Mouse Handler"));
 
     QString dev = QLatin1String("/dev/input/event0");
-    if (device.startsWith(QLatin1String("/dev/")))
-        dev = device;
+    int grab = 0;
+
+    QStringList args = device.split(QLatin1Char(':'));
+    foreach (const QString &arg, args) {
+        if (arg.startsWith(QLatin1String("grab=")))
+            grab = arg.mid(5).toInt();
+        else if (arg.startsWith(QLatin1String("/dev/")))
+            dev = arg;
+    }
 
     m_fd = QT_OPEN(dev.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
     if (m_fd >= 0) {
+        ::ioctl(m_fd, EVIOCGRAB, grab);
         m_notify = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
         connect(m_notify, SIGNAL(activated(int)), this, SLOT(readMouseData()));
     } else {