Bug 783021 - System time: listen to timezone settings changes and update system timezone (part 1). r=cjones

hal/Hal.cpp

@@ -432,6 +432,13 @@ SetTimezone(const nsCString& aTimezoneSpec)
   PROXY_IF_SANDBOXED(SetTimezone(aTimezoneSpec));
 }
 
+nsCString
+GetTimezone()
+{
+  AssertMainThread();
+  RETURN_PROXY_IF_SANDBOXED(GetTimezone());
+}
+
 void
 EnableSensorNotifications(SensorType aSensor) {
   AssertMainThread();

hal/Hal.h

@@ -249,6 +249,12 @@ void AdjustSystemClock(int32_t aDeltaMilliseconds);
  */
 void SetTimezone(const nsCString& aTimezoneSpec);
 
+/**
+ * Get timezone
+ * http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+ */
+nsCString GetTimezone();
+
 /**
  * Reboot the device.
  */

hal/fallback/FallbackTime.cpp

@@ -18,5 +18,11 @@ void
 SetTimezone(const nsCString& aTimezoneSpec)
 {}
 
+nsCString
+GetTimezone()
+{
+  return EmptyCString();
+}
+
 } // namespace hal_impl
 } // namespace mozilla

hal/gonk/GonkHal.cpp

@@ -612,6 +612,14 @@ SetTimezone(const nsCString& aTimezoneSpec)
   tzset();
 }
 
+nsCString 
+GetTimezone()
+{
+  char timezone[32];
+  property_get("persist.sys.timezone", timezone, "");
+  return nsCString(timezone);
+}
+
 // Nothing to do here.  Gonk widgetry always listens for screen
 // orientation changes.
 void

hal/sandbox/PHal.ipdl

@@ -109,9 +109,11 @@ parent:
 
     sync GetScreenBrightness() returns (double brightness);
     SetScreenBrightness(double brightness);
-    
+
     AdjustSystemClock(int32 aDeltaMilliseconds);
     SetTimezone(nsCString aTimezoneSpec);
+    sync GetTimezone()
+      returns (nsCString aTimezoneSpec);
 
     sync SetLight(LightType light, LightConfiguration aConfig)
       returns (bool status);

hal/sandbox/SandboxHal.cpp

@@ -195,6 +195,14 @@ SetTimezone(const nsCString& aTimezoneSpec)
   Hal()->SendSetTimezone(nsCString(aTimezoneSpec));
 } 
 
+nsCString
+GetTimezone()
+{
+  nsCString timezone;
+  Hal()->SendGetTimezone(&timezone);
+  return timezone;
+}
+
 void
 Reboot()
 {
@@ -531,6 +539,16 @@ public:
     return true;  
   }
 
+  virtual bool
+  RecvGetTimezone(nsCString *aTimezoneSpec) MOZ_OVERRIDE
+  {
+    if (!AppProcessHasPermission(this, "systemclock-read")) {
+      return false;
+    }
+    *aTimezoneSpec = hal::GetTimezone();
+    return true;
+  }
+
   virtual bool
   RecvReboot() MOZ_OVERRIDE
   {