text: // Copyright 2016 Uber Technologies, Inc.
  //
  // 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.
  
  #pragma once
  
  #include <sys/types.h>
  
  namespace pyflame {
  // Implementation of a Linux filesystem namespace
  class Namespace {
   public:
    Namespace() = delete;
    explicit Namespace(pid_t pid);
    ~Namespace();
  
    // Get a file descriptor in the namespace
    int Open(const char *path);
  
   private:
    int out_;  // file descriptor that lets us return to our original namespace
    int in_;   // file descriptor that lets us enter the target namespace
  };
  }  // namespace pyflame
  