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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/public/cpp/system/scope_to_message_pipe.h"
namespace mojo {
namespace internal {
namespace {
void OnWatcherSignaled(std::unique_ptr<MessagePipeScoperBase> scoper,
MojoResult result,
const HandleSignalsState& state) {
DCHECK(scoper);
DCHECK_EQ(result, MOJO_RESULT_OK);
DCHECK(state.peer_closed());
// No work to do except for letting |scoper| go out of scope and be destroyed.
}
} // namespace
MessagePipeScoperBase::MessagePipeScoperBase(ScopedMessagePipeHandle pipe)
: pipe_(std::move(pipe)),
pipe_watcher_(FROM_HERE, SimpleWatcher::ArmingPolicy::AUTOMATIC) {}
MessagePipeScoperBase::~MessagePipeScoperBase() = default;
// static
void MessagePipeScoperBase::StartWatchingPipe(
std::unique_ptr<MessagePipeScoperBase> scoper) {
auto* unowned_scoper = scoper.get();
// NOTE: We intentionally use base::Passed here with the owned |scoper|. The
// way we use it here, there is no way for the watcher callback to be invoked
// more than once. If this expectation is ever violated,
// base::RepeatingCallback will CHECK-fail.
unowned_scoper->pipe_watcher_.Watch(
unowned_scoper->pipe_.get(), MOJO_HANDLE_SIGNAL_PEER_CLOSED,
MOJO_TRIGGER_CONDITION_SIGNALS_SATISFIED,
base::BindRepeating(&OnWatcherSignaled, base::Passed(&scoper)));
}
} // namespace internal
} // namespace mojo
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