text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. 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 HOLDER 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 <Kernel/FileSystem/InodeIdentifier.h>
  #include <Kernel/TTY/TTY.h>
  
  class MasterPTY;
  
  class SlavePTY final : public TTY {
  public:
      virtual ~SlavePTY() override;
  
      void on_master_write(const u8*, ssize_t);
      unsigned index() const { return m_index; }
  
  private:
      // ^TTY
      virtual StringView tty_name() const override;
      virtual ssize_t on_tty_write(const u8*, ssize_t) override;
      virtual void echo(u8) override;
  
      // ^CharacterDevice
      virtual bool can_read(const FileDescription&) const override;
      virtual ssize_t read(FileDescription&, u8*, ssize_t) override;
      virtual bool can_write(const FileDescription&) const override;
      virtual const char* class_name() const override { return "SlavePTY"; }
      virtual void close() override;
  
      friend class MasterPTY;
      SlavePTY(MasterPTY&, unsigned index);
  
      RefPtr<MasterPTY> m_master;
      unsigned m_index;
      char m_tty_name[32];
  };
  