import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

ipc/dbus/DBusWatcher.cpp

@@ -0,0 +1,149 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DBusWatcher.h"
+#include "mozilla/Unused.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+namespace ipc {
+
+DBusWatcher::DBusWatcher(DBusConnection* aConnection, DBusWatch* aWatch)
+  : mConnection(aConnection)
+  , mWatch(aWatch)
+{
+  MOZ_ASSERT(mConnection);
+  MOZ_ASSERT(mWatch);
+}
+
+DBusWatcher::~DBusWatcher()
+{ }
+
+DBusConnection*
+DBusWatcher::GetConnection()
+{
+  return mConnection;
+}
+
+void
+DBusWatcher::StartWatching()
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  auto flags = dbus_watch_get_flags(mWatch);
+
+  if (!(flags & (DBUS_WATCH_READABLE|DBUS_WATCH_WRITABLE))) {
+    return;
+  }
+
+  auto ioLoop = MessageLoopForIO::current();
+
+  auto fd = dbus_watch_get_unix_fd(mWatch);
+
+  if (flags & DBUS_WATCH_READABLE) {
+    ioLoop->WatchFileDescriptor(fd, true, MessageLoopForIO::WATCH_READ,
+                                &mReadWatcher, this);
+  }
+  if (flags & DBUS_WATCH_WRITABLE) {
+    ioLoop->WatchFileDescriptor(fd, true, MessageLoopForIO::WATCH_WRITE,
+                                &mWriteWatcher, this);
+  }
+}
+
+void
+DBusWatcher::StopWatching()
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  auto flags = dbus_watch_get_flags(mWatch);
+
+  if (flags & DBUS_WATCH_READABLE) {
+    mReadWatcher.StopWatchingFileDescriptor();
+  }
+  if (flags & DBUS_WATCH_WRITABLE) {
+    mWriteWatcher.StopWatchingFileDescriptor();
+  }
+}
+
+// DBus utility functions, used as function pointers in DBus setup
+
+void
+DBusWatcher::FreeFunction(void* aData)
+{
+  UniquePtr<DBusWatcher> watcher(static_cast<DBusWatcher*>(aData));
+}
+
+dbus_bool_t
+DBusWatcher::AddWatchFunction(DBusWatch* aWatch, void* aData)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  auto connection = static_cast<DBusConnection*>(aData);
+
+  UniquePtr<DBusWatcher> dbusWatcher =
+    MakeUnique<DBusWatcher>(connection, aWatch);
+
+  dbus_watch_set_data(aWatch, dbusWatcher.get(), DBusWatcher::FreeFunction);
+
+  if (dbus_watch_get_enabled(aWatch)) {
+    dbusWatcher->StartWatching();
+  }
+
+  Unused << dbusWatcher.release(); // picked up in |FreeFunction|
+
+  return TRUE;
+}
+
+void
+DBusWatcher::RemoveWatchFunction(DBusWatch* aWatch, void* aData)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  auto dbusWatcher = static_cast<DBusWatcher*>(dbus_watch_get_data(aWatch));
+
+  dbusWatcher->StopWatching();
+}
+
+void
+DBusWatcher::ToggleWatchFunction(DBusWatch* aWatch, void* aData)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  auto dbusWatcher = static_cast<DBusWatcher*>(dbus_watch_get_data(aWatch));
+
+  if (dbus_watch_get_enabled(aWatch)) {
+    dbusWatcher->StartWatching();
+  } else {
+    dbusWatcher->StopWatching();
+  }
+}
+
+// I/O-loop callbacks
+
+void
+DBusWatcher::OnFileCanReadWithoutBlocking(int aFd)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  dbus_watch_handle(mWatch, DBUS_WATCH_READABLE);
+
+  DBusDispatchStatus dbusDispatchStatus;
+
+  do {
+    dbusDispatchStatus = dbus_connection_dispatch(mConnection);
+  } while (dbusDispatchStatus == DBUS_DISPATCH_DATA_REMAINS);
+}
+
+void
+DBusWatcher::OnFileCanWriteWithoutBlocking(int aFd)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  dbus_watch_handle(mWatch, DBUS_WATCH_WRITABLE);
+}
+
+} // namespace ipc
+} // namespace mozilla