text: /*
   * Copyright (C) 2008 The Android Open Source Project
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #pragma once
  
  #include "private/bionic_lock.h"
  
  #include "prop_area.h"
  
  class ContextNode {
   public:
    ContextNode(const char* context, const char* filename)
        : context_(context), pa_(nullptr), no_access_(false), filename_(filename) {
      lock_.init(false);
    }
    ~ContextNode() {
      Unmap();
    }
  
    DISALLOW_COPY_AND_ASSIGN(ContextNode);
  
    bool Open(bool access_rw, bool* fsetxattr_failed);
    bool CheckAccessAndOpen();
    void ResetAccess();
    void Unmap();
  
    const char* context() const {
      return context_;
    }
    prop_area* pa() {
      return pa_;
    }
  
   private:
    bool CheckAccess();
  
    Lock lock_;
    const char* context_;
    prop_area* pa_;
    bool no_access_;
    const char* filename_;
  };
  