VirtualTerminal.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef POSIX_VIRTUALTERMINAL_H
#define POSIX_VIRTUALTERMINAL_H
#include <config.h>
 
#include "modules/subsys/posix/console-syscalls.h"
#include "modules/system/console/TextIO.h"
#include "modules/system/vfs/File.h"
 
#define MAX_VT 64
 
class DevFsDirectory;
class Process;
 
class VirtualTerminalManager {
 public:
  VirtualTerminalManager(DevFsDirectory* parentDir);
  virtual ~VirtualTerminalManager();
 
  enum SwitchPermission { Allowed, Disallowed };
 
  enum SystemMode { Text, Graphics };
 
  bool initialise();
 
  bool activate(size_t n);
 
  bool reportPermission(size_t n, SwitchPermission perm);
  bool acknowledgeAcquire(size_t n);
 
  size_t openInactive();
 
  void lockSwitching(bool locked);
 
  size_t getCurrentTerminalNumber() const;
  TextIO* getCurrentTerminal() const;
  File* getCurrentTerminalFile() const;
 
  struct vt_mode getTerminalMode(size_t n) const;
  bool setTerminalMode(size_t n, struct vt_mode mode);
  bool isTerminal(size_t n) const;
 
  struct vt_stat getState() const;
 
  void setSystemMode(size_t n, SystemMode mode);
  SystemMode getSystemMode(size_t n) const;
 
  void setInputMode(size_t n, TextIO::InputMode newMode);
  TextIO::InputMode getInputMode(size_t n) const;
 
 private:
  bool sendSignal(size_t n, bool acq);
  void switchTerminal(size_t n);
 
  struct VirtualTerminal {
    TextIO* textio;
    File* file;
    struct vt_mode mode;
    SystemMode systemMode;
 
#if THREADS
    size_t owner;
    size_t ownerThread;
#endif
  };
 
  VirtualTerminal m_Terminals[MAX_VT];
 
  TextIO* m_pTty;
 
  TextIO* m_pTtys[MAX_VT];
  File* m_pTtyFiles[MAX_VT];
  struct vt_mode m_Modes[MAX_VT];
 
  size_t m_CurrentTty;
  size_t m_WantedTty;
  size_t m_NumTtys;
 
  DevFsDirectory* m_ParentDir;
 
  bool m_bSwitchingLocked;
 
  mutable Mutex m_Lock;
};
 
#endif