src/traced/probes/ftrace/atrace_wrapper.h

/*
 * Copyright (C) 2018 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.
 */

#ifndef SRC_TRACED_PROBES_FTRACE_ATRACE_WRAPPER_H_
#define SRC_TRACED_PROBES_FTRACE_ATRACE_WRAPPER_H_

#include <string>
#include <vector>

namespace perfetto {

class AtraceWrapper {
 public:
  virtual ~AtraceWrapper();
  // When we are sideloaded on an old version of Android (pre P), we cannot use
  // atrace --only_userspace because that option doesn't exist. In that case we:
  // - Just use atrace --async_start/stop, which will cause atrace to also
  //   poke at ftrace.
  // - Suppress the checks for "somebody else enabled ftrace unexpectedly".
  virtual bool SupportsUserspaceOnly() = 0;
  virtual bool RunAtrace(const std::vector<std::string>& args,
                         std::string* atrace_errors) = 0;
};

class AtraceWrapperImpl : public AtraceWrapper {
 public:
  ~AtraceWrapperImpl() override;
  bool SupportsUserspaceOnly() override;
  bool RunAtrace(const std::vector<std::string>& args,
                 std::string* atrace_errors) override;
};

}  // namespace perfetto

#endif  // SRC_TRACED_PROBES_FTRACE_ATRACE_WRAPPER_H_