native_client_sdk/src/libraries/nacl_io/devfs/tty_node.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef LIBRARIES_NACL_IO_DEVFS_TTY_NODE_H_
   6 #define LIBRARIES_NACL_IO_DEVFS_TTY_NODE_H_
   7
   8 #include <poll.h>
   9 #include <pthread.h>
  10
  11 #include <deque>
  12
  13 #include <ppapi/c/pp_var.h>
  14
  15 #include "nacl_io/char_node.h"
  16 #include "nacl_io/ioctl.h"
  17 #include "nacl_io/ostermios.h"
  18
  19 namespace nacl_io {
  20
  21 class TtyNode : public CharNode {
  22  public:
  23   explicit TtyNode(Filesystem* filesystem);
  24
  25   virtual EventEmitter* GetEventEmitter();
  26
  27   virtual Error VIoctl(int request, va_list args);
  28
  29   virtual Error Read(const HandleAttr& attr,
  30                      void* buf,
  31                      size_t count,
  32                      int* out_bytes);
  33
  34   virtual Error Write(const HandleAttr& attr,
  35                       const void* buf,
  36                       size_t count,
  37                       int* out_bytes);
  38
  39   virtual Error Tcgetattr(struct termios* termios_p);
  40   virtual Error Tcsetattr(int optional_actions,
  41                           const struct termios* termios_p);
  42
  43   virtual Error Isatty() { return 0; }
  44
  45  private:
  46   ScopedEventEmitter emitter_;
  47
  48   Error ProcessInput(PP_Var var);
  49   Error ProcessInput(const char* buffer, size_t num_bytes);
  50   Error Echo(const char* string, int count);
  51   void InitTermios();
  52
  53   std::deque<char> input_buffer_;
  54   struct termios termios_;
  55
  56   /// Current height of terminal in rows.  Set via ioctl(2).
  57   int rows_;
  58   /// Current width of terminal in columns.  Set via ioctl(2).
  59   int cols_;
  60
  61   // Output handler for TTY.  This is set via ioctl(2).
  62   struct tioc_nacl_output output_handler_;
  63   // Lock to protect output_handler_.  This lock gets aquired whenever
  64   // output_handler_ is used or set.
  65   sdk_util::SimpleLock output_lock_;
  66 };
  67
  68 }  // namespace nacl_io
  69
  70 #endif  // LIBRARIES_NACL_IO_DEVFS_TTY_NODE_H_