ui/ozone/platform/dri/virtual_terminal_manager.cc

   1 // Copyright 2014 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 #include "ui/ozone/platform/dri/virtual_terminal_manager.h"
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <linux/kd.h>
  10 #include <linux/vt.h>
  11 #include <sys/ioctl.h>
  12 #include <unistd.h>
  13
  14 #include "base/logging.h"
  15
  16 namespace ui {
  17
  18 namespace {
  19
  20 const char kTTYDevice[] = "/dev/tty1";
  21
  22 const int kVT = 1;
  23
  24 }  // namespace
  25
  26 VirtualTerminalManager::VirtualTerminalManager() {
  27   // Use the current console.
  28   fd_ = open(kTTYDevice, O_RDWR | O_CLOEXEC, 0);
  29   if (fd_ < 0)
  30     LOG(ERROR) << "Failed to open '" << kTTYDevice << "' " << strerror(errno);
  31
  32   if (ioctl(fd_, VT_ACTIVATE, kVT) || ioctl(fd_, VT_WAITACTIVE, kVT))
  33     LOG(ERROR) << "Failed to switch to VT: " << kVT
  34                << " error: " << strerror(errno);;
  35
  36   if (ioctl(fd_, KDGETMODE, &vt_mode_))
  37     LOG(ERROR) << "Failed to get VT mode: " << strerror(errno);
  38
  39   if (ioctl(fd_, KDSETMODE, KD_GRAPHICS))
  40     LOG(ERROR) << "Failed to set graphics mode: " << strerror(errno);
  41
  42   if (tcgetattr(fd_, &terminal_attributes_))
  43     LOG(ERROR) << "Failed to get terminal attributes";
  44
  45   // Stop the TTY from processing keys and echo-ing them to the terminal.
  46   struct termios raw_attributes = terminal_attributes_;
  47   cfmakeraw(&raw_attributes);
  48   raw_attributes.c_oflag |= OPOST;
  49   if (tcsetattr(fd_, TCSANOW, &raw_attributes))
  50     LOG(ERROR) << "Failed to set raw attributes";
  51
  52   if (ioctl(fd_, KDGKBMODE, &previous_keyboard_mode_))
  53     LOG(ERROR) << "Failed to get keyboard mode";
  54
  55   if (ioctl(fd_, KDSKBMODE, K_OFF) && ioctl(fd_, KDSKBMODE, K_RAW))
  56     LOG(ERROR) << "Failed to set keyboard mode";
  57 }
  58
  59 VirtualTerminalManager::~VirtualTerminalManager() {
  60   if (fd_ < 0)
  61     return;
  62
  63   if (ioctl(fd_, KDSETMODE, &vt_mode_))
  64     LOG(ERROR) << "Failed to restore VT mode";
  65
  66   if (ioctl(fd_, KDSKBMODE, previous_keyboard_mode_))
  67     LOG(ERROR) << "Failed to restore keyboard mode";
  68
  69   if (tcsetattr(fd_, TCSANOW, &terminal_attributes_))
  70     LOG(ERROR) << "Failed to restore terminal attributes";
  71
  72   close(fd_);
  73 }
  74
  75 }  // namespace ui