disconnect GVolumeMonitor signals from GioLister before destroying it

fixes #5369

src/core/signalchecker.cpp

@@ -21,7 +21,7 @@
 
 #include "core/logging.h"
 
-bool CheckedGConnect(gpointer source, const char* signal, GCallback callback,
+gulong CheckedGConnect(gpointer source, const char* signal, GCallback callback,
                      gpointer data, const int callback_param_count) {
   guint signal_id = 0;
   GQuark detail = 0;
@@ -29,7 +29,7 @@ bool CheckedGConnect(gpointer source, const char* signal, GCallback callback,
   if (!g_signal_parse_name(signal, G_OBJECT_TYPE(source), &signal_id, &detail,
                            false)) {
     qFatal("Connecting to invalid signal: %s", signal);
-    return false;
+    return 0;
   }
 
   GSignalQuery query;
@@ -39,9 +39,8 @@ bool CheckedGConnect(gpointer source, const char* signal, GCallback callback,
   int signal_params = query.n_params + 2;
   if (signal_params != callback_param_count) {
     qFatal("Connecting callback to signal with different parameters counts");
-    return false;
+    return 0;
   }
 
-  g_signal_connect(source, signal, G_CALLBACK(callback), data);
-  return true;
+  return g_signal_connect(source, signal, G_CALLBACK(callback), data);
 }

src/core/signalchecker.h

@@ -25,14 +25,14 @@
 #include <boost/typeof/typeof.hpp>
 
 // Do not call this directly, use CHECKED_GCONNECT instead.
-bool CheckedGConnect(gpointer source, const char* signal, GCallback callback,
-                     gpointer data, const int callback_param_count);
+gulong CheckedGConnect(gpointer source, const char* signal, GCallback callback,
+                       gpointer data, const int callback_param_count);
 
 #define FUNCTION_ARITY(callback) \
   boost::function_types::function_arity<BOOST_TYPEOF(callback)>::value
 
 #define CHECKED_GCONNECT(source, signal, callback, data)      \
   CheckedGConnect(source, signal, G_CALLBACK(callback), data, \
-                  FUNCTION_ARITY(callback));
+                  FUNCTION_ARITY(callback))
 
 #endif  // CORE_SIGNALCHECKER_H_

src/devices/giolister.cpp

@@ -94,11 +94,19 @@ void GioLister::Init() {
   g_list_free(mounts);
 
   // Connect signals from the monitor
-  CHECKED_GCONNECT(monitor_, "volume-added", &VolumeAddedCallback, this);
-  CHECKED_GCONNECT(monitor_, "volume-removed", &VolumeRemovedCallback, this);
-  CHECKED_GCONNECT(monitor_, "mount-added", &MountAddedCallback, this);
-  CHECKED_GCONNECT(monitor_, "mount-changed", &MountChangedCallback, this);
-  CHECKED_GCONNECT(monitor_, "mount-removed", &MountRemovedCallback, this);
+  signals_.append(CHECKED_GCONNECT(monitor_, "volume-added", &VolumeAddedCallback, this));
+  signals_.append(CHECKED_GCONNECT(monitor_, "volume-removed", &VolumeRemovedCallback, this));
+  signals_.append(CHECKED_GCONNECT(monitor_, "mount-added", &MountAddedCallback, this));
+  signals_.append(CHECKED_GCONNECT(monitor_, "mount-changed", &MountChangedCallback, this));
+  signals_.append(CHECKED_GCONNECT(monitor_, "mount-removed", &MountRemovedCallback, this));
+}
+
+GioLister::~GioLister()
+{
+  foreach(gulong signal, signals_)
+  {
+    g_signal_handler_disconnect(monitor_, signal);
+  }
 }
 
 QStringList GioLister::DeviceUniqueIDs() {

src/devices/giolister.h

@@ -36,6 +36,7 @@ class GioLister : public DeviceLister {
 
  public:
   GioLister() {}
+  ~GioLister();
 
   int priority() const { return 50; }
 
@@ -137,6 +138,7 @@ class GioLister : public DeviceLister {
 
  private:
   ScopedGObject<GVolumeMonitor> monitor_;
+  QList<gulong> signals_;
 
   QMutex mutex_;
   QMap<QString, DeviceInfo> devices_;