1 files changed, 47 insertions, 0 deletions
diff --git a/ipc/glue/PChildToParentStream.ipdl b/ipc/glue/PChildToParentStream.ipdl
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+++ b/ipc/glue/PChildToParentStream.ipdl
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+/* 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 protocol PBackground;
+include protocol PContent;
+include protocol PSocketProcess;
+
+include "mozilla/layers/WebRenderMessageUtils.h";
+
+using mozilla::wr::ByteBuffer from "mozilla/webrender/WebRenderTypes.h";
+
+namespace mozilla {
+namespace ipc {
+
+// This is protocol is the opposite of PParentToChildStream. Please keep these
+// protocols in sync.
+protocol PChildToParentStream
+{
+  manager PBackground or PContent or PSocketProcess;
+
+parent:
+  async Buffer(ByteBuffer aBuffer);
+  async Close(nsresult aRv);
+
+child:
+  // The remote stream can be used in 2 ways: it can start receiving data
+  // immediately after the creation of the child actor, or it can wait until
+  // the child stream is actually used. This second configuration is enabled by
+  // passing 'true' to delayedStart in AutoIPCStream CTOR.
+  // If we are delaying the reading, at the first use of the remote stream, we
+  // must activate the sending of data. This happens by calling this method.
+  async StartReading();
+
+  // The parent side has hit an error condition and has requested the child
+  // actor issue a Close() message.  The close must be initiated by the child
+  // to avoid racing with an in-flight Buffer() message.
+  async RequestClose(nsresult aRv);
+
+  // Stream is always destroyed from the parent side.  This occurs if the
+  // parent encounters an error while writing to its pipe or if the child
+  // signals the stream should close by SendClose().
+  async __delete__();
+};
+
+} // namespace ipc
+} // namespace mozilla