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
16namespace ui {
17
18namespace {
19
20const char kTTYDevice[] = "/dev/tty1";
21
22const int kVT = 1;
23
24}  // namespace
25
26VirtualTerminalManager::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
59VirtualTerminalManager::~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
76