//
// Copyright (C) 2019 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "cuttlefish/host/commands/run_cvd/launch/logcat_receiver.h"

#include <string>

#include "cuttlefish/common/libs/fs/shared_fd.h"
#include "cuttlefish/common/libs/utils/subprocess.h"
#include "cuttlefish/host/libs/config/config_instance_derived.h"
#include "cuttlefish/host/libs/config/cuttlefish_config.h"
#include "cuttlefish/host/libs/config/known_paths.h"
#include "cuttlefish/host/libs/feature/command_source.h"
#include "cuttlefish/result/result.h"

namespace cuttlefish {

Result<MonitorCommand> LogcatReceiver(
    const CuttlefishConfig::InstanceSpecific& instance) {
  // Open the pipe here (from the launcher) to ensure the pipe is not deleted
  // due to the usage counters in the kernel reaching zero. If this is not
  // done and the logcat_receiver crashes for some reason the VMM may get
  // SIGPIPE.
  const std::string log_name = LogcatPipeName(instance);

  return Command(LogcatReceiverBinary())
      .AddParameter("-log_pipe_fd=", CF_EXPECT(SharedFD::Fifo(log_name, 0600)));
}

}  // namespace cuttlefish
