[Ozone DRI] Add support to configure the VT on CrOS

ui/ozone/platform/dri/virtual_terminal_manager.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/ozone/platform/dri/virtual_terminal_manager.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/kd.h>
+#include <linux/vt.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "base/logging.h"
+
+namespace ui {
+
+namespace {
+
+const char kTTYDevice[] = "/dev/tty1";
+
+const int kVT = 1;
+
+}  // namespace
+
+VirtualTerminalManager::VirtualTerminalManager() {
+  // Use the current console.
+  fd_ = open(kTTYDevice, O_RDWR | O_CLOEXEC, 0);
+  if (fd_ < 0)
+    LOG(ERROR) << "Failed to open '" << kTTYDevice << "' " << strerror(errno);
+
+  if (ioctl(fd_, VT_ACTIVATE, kVT) || ioctl(fd_, VT_WAITACTIVE, kVT))
+    LOG(ERROR) << "Failed to switch to VT: " << kVT
+               << " error: " << strerror(errno);;
+
+  if (ioctl(fd_, KDGETMODE, &vt_mode_))
+    LOG(ERROR) << "Failed to get VT mode: " << strerror(errno);
+
+  if (ioctl(fd_, KDSETMODE, KD_GRAPHICS))
+    LOG(ERROR) << "Failed to set graphics mode: " << strerror(errno);
+
+  if (tcgetattr(fd_, &terminal_attributes_))
+    LOG(ERROR) << "Failed to get terminal attributes";
+
+  // Stop the TTY from processing keys and echo-ing them to the terminal.
+  struct termios raw_attributes = terminal_attributes_;
+  cfmakeraw(&raw_attributes);
+  raw_attributes.c_oflag |= OPOST;
+  if (tcsetattr(fd_, TCSANOW, &raw_attributes))
+    LOG(ERROR) << "Failed to set raw attributes";
+
+  if (ioctl(fd_, KDGKBMODE, &previous_keyboard_mode_))
+    LOG(ERROR) << "Failed to get keyboard mode";
+
+  if (ioctl(fd_, KDSKBMODE, K_OFF) && ioctl(fd_, KDSKBMODE, K_RAW))
+    LOG(ERROR) << "Failed to set keyboard mode";
+}
+
+VirtualTerminalManager::~VirtualTerminalManager() {
+  if (fd_ < 0)
+    return;
+
+  if (ioctl(fd_, KDSETMODE, &vt_mode_))
+    LOG(ERROR) << "Failed to restore VT mode";
+
+  if (ioctl(fd_, KDSKBMODE, previous_keyboard_mode_))
+    LOG(ERROR) << "Failed to restore keyboard mode";
+
+  if (tcsetattr(fd_, TCSANOW, &terminal_attributes_))
+    LOG(ERROR) << "Failed to restore terminal attributes";
+
+  close(fd_);
+}
+
+}  // namespace ui