зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
2.3 KiB
C++
91 строка
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "IPCStreamDestination.h"
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#include "nsIAsyncInputStream.h"
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#include "nsIAsyncOutputStream.h"
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#include "nsIPipe.h"
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namespace mozilla {
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namespace ipc {
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IPCStreamDestination::IPCStreamDestination()
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{
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}
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IPCStreamDestination::~IPCStreamDestination()
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{
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}
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nsresult
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IPCStreamDestination::Initialize()
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{
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MOZ_ASSERT(!mReader);
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MOZ_ASSERT(!mWriter);
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// use async versions for both reader and writer even though we are
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// opening the writer as an infinite stream. We want to be able to
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// use CloseWithStatus() to communicate errors through the pipe.
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// Use an "infinite" pipe because we cannot apply back-pressure through
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// the async IPC layer at the moment. Blocking the IPC worker thread
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// is not desirable, either.
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nsresult rv = NS_NewPipe2(getter_AddRefs(mReader),
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getter_AddRefs(mWriter),
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true, true, // non-blocking
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0, // segment size
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UINT32_MAX); // "infinite" pipe
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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return NS_OK;
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}
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already_AddRefed<nsIInputStream>
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IPCStreamDestination::TakeReader()
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{
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MOZ_ASSERT(mReader);
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return mReader.forget();
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}
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void
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IPCStreamDestination::ActorDestroyed()
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{
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MOZ_ASSERT(mWriter);
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// If we were gracefully closed we should have gotten RecvClose(). In
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// that case, the writer will already be closed and this will have no
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// effect. This just aborts the writer in the case where the child process
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// crashes.
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mWriter->CloseWithStatus(NS_ERROR_ABORT);
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}
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void
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IPCStreamDestination::BufferReceived(const nsCString& aBuffer)
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{
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MOZ_ASSERT(mWriter);
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uint32_t numWritten = 0;
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// This should only fail if we hit an OOM condition.
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nsresult rv = mWriter->Write(aBuffer.get(), aBuffer.Length(), &numWritten);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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RequestClose(rv);
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}
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}
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void
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IPCStreamDestination::CloseReceived(nsresult aRv)
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{
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MOZ_ASSERT(mWriter);
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mWriter->CloseWithStatus(aRv);
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TerminateDestination();
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}
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} // namespace ipc
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} // namespace mozilla
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