[udev] Add wrapper for udev_monitor

udev.cpp

@@ -153,6 +153,16 @@ UdevDevice::Ptr Udev::deviceFromSyspath(const char *syspath)
     return std::move(UdevDevice::Ptr(new UdevDevice(udev_device_new_from_syspath(m_udev, syspath))));
 }
 
+UdevMonitor *Udev::monitor()
+{
+    UdevMonitor *m = new UdevMonitor(this);
+    if (!m->isValid()) {
+        delete m;
+        m = nullptr;
+    }
+    return m;
+}
+
 UdevDevice::UdevDevice(udev_device *device)
     : m_device(device)
 {
@@ -206,4 +216,49 @@ bool UdevDevice::hasProperty(const char *key, const char *value)
     return qstrcmp(p, value) == 0;
 }
 
+UdevMonitor::UdevMonitor(Udev *udev)
+    : m_udev(udev)
+    , m_monitor(udev_monitor_new_from_netlink(*udev, "udev"))
+{
+}
+
+UdevMonitor::~UdevMonitor()
+{
+    if (m_monitor) {
+        udev_monitor_unref(m_monitor);
+    }
+}
+
+int UdevMonitor::fd() const
+{
+    if (m_monitor) {
+        return udev_monitor_get_fd(m_monitor);
+    }
+    return -1;
+}
+
+void UdevMonitor::filterSubsystemDevType(const char *subSystem, const char *devType)
+{
+    if (!m_monitor) {
+        return;
+    }
+    udev_monitor_filter_add_match_subsystem_devtype(m_monitor, subSystem, devType);
+}
+
+void UdevMonitor::enable()
+{
+    if (!m_monitor) {
+        return;
+    }
+    udev_monitor_enable_receiving(m_monitor);
+}
+
+UdevDevice::Ptr UdevMonitor::getDevice()
+{
+    if (!m_monitor) {
+        return std::move(UdevDevice::Ptr());
+    }
+    return std::move(UdevDevice::Ptr(new UdevDevice(udev_monitor_receive_device(m_monitor))));
+}
+
 }

udev.h

@@ -23,10 +23,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 struct udev;
 struct udev_device;
+struct udev_monitor;
 
 namespace KWin
 {
-
+class Udev;
 
 class UdevDevice
 {
@@ -52,6 +53,25 @@ private:
     udev_device *m_device;
 };
 
+class UdevMonitor
+{
+public:
+    explicit UdevMonitor(Udev *udev);
+    ~UdevMonitor();
+
+    int fd() const;
+    bool isValid() const {
+        return m_monitor != nullptr;
+    }
+    void filterSubsystemDevType(const char *subSystem, const char *devType = nullptr);
+    void enable();
+    UdevDevice::Ptr getDevice();
+
+private:
+    Udev *m_udev;
+    udev_monitor *m_monitor;
+};
+
 class Udev
 {
 public:
@@ -63,6 +83,7 @@ public:
     }
     UdevDevice::Ptr primaryGpu();
     UdevDevice::Ptr deviceFromSyspath(const char *syspath);
+    UdevMonitor *monitor();
     operator udev*() const {
         return m_udev;
     }