1 | /* $Id: display.cpp 69500 2017-10-28 15:14:05Z vboxsync $ */
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2 | /** @file
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3 | * X11 guest client - display management.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 | #include "VBoxClient.h"
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19 |
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20 | #include <iprt/err.h>
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21 | #include <iprt/file.h>
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22 | #include <iprt/mem.h>
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23 | #include <iprt/string.h>
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24 |
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25 | #include <X11/Xlib.h>
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26 | #include <X11/Xatom.h>
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27 | #include <X11/extensions/Xrandr.h>
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28 |
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29 | /** @todo this should probably be replaced by something IPRT */
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30 | /* For system() and WEXITSTATUS() */
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31 | #include <stdlib.h>
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32 | #include <sys/types.h>
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33 | #include <sys/wait.h>
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34 | #include <errno.h>
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35 | #include <limits.h>
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36 | #include <poll.h>
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37 | #include <time.h>
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38 |
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39 | /* TESTING: Dynamic resizing and mouse integration toggling should work
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40 | * correctly with a range of X servers (pre-1.3, 1.3 and later under Linux, 1.3
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41 | * and later under Solaris) with Guest Additions installed. Switching to a
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42 | * virtual terminal while a user session is in place should disable dynamic
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43 | * resizing and cursor integration, switching back should re-enable them. */
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44 |
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45 | /** Display magic number, start of a UUID. */
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46 | #define DISPLAYSTATE_MAGIC UINT32_C(0xf0029993)
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47 |
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48 | /** State information needed for the service. The main VBoxClient code provides
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49 | * the daemon logic needed by all services. */
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50 | struct DISPLAYSTATE
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51 | {
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52 | /** The service interface. */
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53 | struct VBCLSERVICE *pInterface;
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54 | /** Magic number for sanity checks. */
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55 | uint32_t magic;
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56 | /** Are we initialised yet? */
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57 | bool mfInit;
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58 | /** The connection to the server. */
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59 | Display *pDisplay;
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60 | /** The RandR extension base event number. */
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61 | int cRREventBase;
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62 | /** Can we use version 1.2 or later of the RandR protocol here? */
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63 | bool fHaveRandR12;
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64 | /** The command argument to use for the xrandr binary. Currently only
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65 | * used to support the non-standard location on some Solaris systems -
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66 | * would it make sense to use absolute paths on all systems? */
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67 | const char *pcszXrandr;
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68 | /** Was there a recent mode hint with no following root window resize, and
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69 | * if so, have we waited for a reasonable time? */
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70 | time_t timeLastModeHint;
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71 | };
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72 |
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73 | static unsigned char *getRootProperty(struct DISPLAYSTATE *pState, const char *pszName,
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74 | long cItems, Atom type)
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75 | {
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76 | Atom actualType = None;
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77 | int iFormat = 0;
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78 | unsigned long cReturned = 0;
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79 | unsigned long cAfter = 0;
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80 | unsigned char *pData = 0;
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81 |
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82 | if (XGetWindowProperty(pState->pDisplay, DefaultRootWindow(pState->pDisplay),
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83 | XInternAtom(pState->pDisplay, pszName, 0), 0, cItems,
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84 | False /* delete */, type, &actualType, &iFormat,
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85 | &cReturned, &cAfter, &pData))
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86 | return NULL;
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87 | return pData;
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88 | }
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89 |
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90 | static void doResize(struct DISPLAYSTATE *pState)
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91 | {
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92 | /** @note The xrandr command can fail if something else accesses RandR at
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93 | * the same time. We just ignore failure for now as we do not know what
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94 | * someone else is doing. */
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95 | if (!pState->fHaveRandR12)
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96 | {
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97 | char szCommand[256];
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98 | unsigned char *pData;
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99 |
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100 | pData = getRootProperty(pState, "VBOXVIDEO_PREFERRED_MODE", 1, XA_INTEGER);
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101 | if (pData != NULL)
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102 | {
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103 | RTStrPrintf(szCommand, sizeof(szCommand), "%s -s %ux%u",
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104 | pState->pcszXrandr, ((unsigned long *)pData)[0] >> 16, ((unsigned long *)pData)[0] & 0xFFFF);
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105 | int rcShutUpGcc = system(szCommand); RT_NOREF_PV(rcShutUpGcc);
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106 | XFree(pData);
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107 | }
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108 | }
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109 | else
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110 | {
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111 | const char szCommandBase[] =
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112 | "%s --output VGA-0 --auto --output VGA-1 --auto --right-of VGA-0 "
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113 | "--output VGA-2 --auto --right-of VGA-1 --output VGA-3 --auto --right-of VGA-2 "
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114 | "--output VGA-4 --auto --right-of VGA-3 --output VGA-5 --auto --right-of VGA-4 "
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115 | "--output VGA-6 --auto --right-of VGA-5 --output VGA-7 --auto --right-of VGA-6 "
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116 | "--output VGA-8 --auto --right-of VGA-7 --output VGA-9 --auto --right-of VGA-8 "
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117 | "--output VGA-10 --auto --right-of VGA-9 --output VGA-11 --auto --right-of VGA-10 "
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118 | "--output VGA-12 --auto --right-of VGA-11 --output VGA-13 --auto --right-of VGA-12 "
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119 | "--output VGA-14 --auto --right-of VGA-13 --output VGA-15 --auto --right-of VGA-14 "
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120 | "--output VGA-16 --auto --right-of VGA-15 --output VGA-17 --auto --right-of VGA-16 "
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121 | "--output VGA-18 --auto --right-of VGA-17 --output VGA-19 --auto --right-of VGA-18 "
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122 | "--output VGA-20 --auto --right-of VGA-19 --output VGA-21 --auto --right-of VGA-20 "
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123 | "--output VGA-22 --auto --right-of VGA-21 --output VGA-23 --auto --right-of VGA-22 "
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124 | "--output VGA-24 --auto --right-of VGA-23 --output VGA-25 --auto --right-of VGA-24 "
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125 | "--output VGA-26 --auto --right-of VGA-25 --output VGA-27 --auto --right-of VGA-26 "
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126 | "--output VGA-28 --auto --right-of VGA-27 --output VGA-29 --auto --right-of VGA-28 "
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127 | "--output VGA-30 --auto --right-of VGA-29 --output VGA-31 --auto --right-of VGA-30";
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128 | char szCommand[sizeof(szCommandBase) + 256];
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129 | RTStrPrintf(szCommand, sizeof(szCommand), szCommandBase, pState->pcszXrandr);
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130 | int rcShutUpGcc = system(szCommand); RT_NOREF_PV(rcShutUpGcc);
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131 | }
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132 | }
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133 |
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134 | /** Main loop: handle display hot-plug events, property updates (which can
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135 | * signal VT switches hot-plug in old X servers). */
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136 | static void runDisplay(struct DISPLAYSTATE *pState)
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137 | {
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138 | Display *pDisplay = pState->pDisplay;
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139 | long cValue = 1;
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140 |
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141 | /* One way or another we want the preferred mode at server start-up. */
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142 | doResize(pState);
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143 | XSelectInput(pDisplay, DefaultRootWindow(pDisplay), PropertyChangeMask | StructureNotifyMask);
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144 | if (pState->fHaveRandR12)
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145 | XRRSelectInput(pDisplay, DefaultRootWindow(pDisplay), RRScreenChangeNotifyMask);
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146 | /* Semantics: when VBOXCLIENT_STARTED is set, pre-1.3 X.Org Server driver
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147 | * assumes that a client capable of handling mode hints will be present for the
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148 | * rest of the X session. If we crash things will not work as they should.
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149 | * I thought that preferable to implementing complex crash-handling logic.
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150 | */
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151 | XChangeProperty(pState->pDisplay, DefaultRootWindow(pState->pDisplay), XInternAtom(pState->pDisplay, "VBOXCLIENT_STARTED", 0),
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152 | XA_INTEGER, 32, PropModeReplace, (unsigned char *)&cValue, 1);
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153 | /* Interrupting this cleanly will be more work than making it robust
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154 | * against spontaneous termination, especially as it will never get
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155 | * properly tested, so I will go for the second. */
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156 | while (true)
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157 | {
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158 | XEvent event;
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159 | struct pollfd PollFd;
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160 | int pollTimeOut = -1;
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161 | int cFds;
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162 |
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163 | /* Do not handle overflow. */
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164 | if (pState->timeLastModeHint > 0 && pState->timeLastModeHint < INT_MAX - 2)
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165 | pollTimeOut = 2 - (time(0) - pState->timeLastModeHint);
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166 | PollFd.fd = ConnectionNumber(pDisplay);
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167 | PollFd.events = POLLIN; /* Hang-up is always reported. */
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168 | XFlush(pDisplay);
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169 | cFds = poll(&PollFd, 1, pollTimeOut >= 0 ? pollTimeOut * 1000 : -1);
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170 | while (XPending(pDisplay))
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171 | {
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172 | XNextEvent(pDisplay, &event);
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173 | /* This property is deleted when the server regains the virtual
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174 | * terminal. Force the main thread to call xrandr again, as old X
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175 | * servers could not handle it while switched out. */
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176 | if ( !pState->fHaveRandR12
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177 | && event.type == PropertyNotify
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178 | && event.xproperty.state == PropertyDelete
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179 | && event.xproperty.window == DefaultRootWindow(pDisplay)
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180 | && event.xproperty.atom == XInternAtom(pDisplay, "VBOXVIDEO_NO_VT", False))
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181 | doResize(pState);
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182 | if ( !pState->fHaveRandR12
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183 | && event.type == PropertyNotify
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184 | && event.xproperty.state == PropertyNewValue
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185 | && event.xproperty.window == DefaultRootWindow(pDisplay)
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186 | && event.xproperty.atom == XInternAtom(pDisplay, "VBOXVIDEO_PREFERRED_MODE", False))
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187 | doResize(pState);
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188 | if ( pState->fHaveRandR12
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189 | && event.type == pState->cRREventBase + RRScreenChangeNotify)
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190 | pState->timeLastModeHint = time(0);
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191 | if ( event.type == ConfigureNotify
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192 | && event.xproperty.window == DefaultRootWindow(pDisplay))
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193 | pState->timeLastModeHint = 0;
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194 | }
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195 | if (cFds == 0 && pState->timeLastModeHint > 0)
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196 | doResize(pState);
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197 | }
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198 | }
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199 |
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200 | static int initDisplay(struct DISPLAYSTATE *pState)
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201 | {
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202 | char szCommand[256];
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203 | int status;
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204 |
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205 | pState->pDisplay = XOpenDisplay(NULL);
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206 | if (!pState->pDisplay)
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207 | return VERR_NOT_FOUND;
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208 | if (!XRRQueryExtension(pState->pDisplay, &pState->cRREventBase, &status))
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209 | return VERR_NOT_FOUND;
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210 | pState->fHaveRandR12 = false;
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211 | pState->pcszXrandr = "xrandr";
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212 | if (RTFileExists("/usr/X11/bin/xrandr"))
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213 | pState->pcszXrandr = "/usr/X11/bin/xrandr";
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214 | status = system(pState->pcszXrandr);
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215 | if (WEXITSTATUS(status) != 0) /* Utility or extension not available. */
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216 | VBClFatalError(("Failed to execute the xrandr utility.\n"));
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217 | RTStrPrintf(szCommand, sizeof(szCommand), "%s --q12", pState->pcszXrandr);
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218 | status = system(szCommand);
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219 | if (WEXITSTATUS(status) == 0)
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220 | pState->fHaveRandR12 = true;
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221 | return VINF_SUCCESS;
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222 | }
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223 |
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224 | static const char *getPidFilePath()
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225 | {
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226 | return ".vboxclient-display.pid";
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227 | }
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228 |
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229 | static struct DISPLAYSTATE *getStateFromInterface(struct VBCLSERVICE **ppInterface)
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230 | {
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231 | struct DISPLAYSTATE *pSelf = (struct DISPLAYSTATE *)ppInterface;
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232 | if (pSelf->magic != DISPLAYSTATE_MAGIC)
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233 | VBClFatalError(("Bad display service object!\n"));
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234 | return pSelf;
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235 | }
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236 |
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237 | static int init(struct VBCLSERVICE **ppInterface)
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238 | {
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239 | struct DISPLAYSTATE *pSelf = getStateFromInterface(ppInterface);
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240 | int rc;
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241 |
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242 | if (pSelf->mfInit)
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243 | return VERR_WRONG_ORDER;
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244 | rc = initDisplay(pSelf);
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245 | if (RT_FAILURE(rc))
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246 | return rc;
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247 | if (RT_SUCCESS(rc))
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248 | pSelf->mfInit = true;
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249 | return rc;
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250 | }
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251 |
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252 | static int run(struct VBCLSERVICE **ppInterface, bool fDaemonised)
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253 | {
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254 | RT_NOREF1(fDaemonised);
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255 | struct DISPLAYSTATE *pSelf = getStateFromInterface(ppInterface);
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256 |
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257 | if (!pSelf->mfInit)
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258 | return VERR_WRONG_ORDER;
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259 | runDisplay(pSelf);
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260 | return VERR_INTERNAL_ERROR; /* "Should never reach here." */
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261 | }
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262 |
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263 | struct VBCLSERVICE vbclDisplayInterface =
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264 | {
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265 | getPidFilePath,
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266 | init,
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267 | run,
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268 | VBClServiceDefaultCleanup
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269 | };
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270 |
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271 | struct VBCLSERVICE **VBClGetDisplayService()
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272 | {
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273 | struct DISPLAYSTATE *pService = (struct DISPLAYSTATE *)RTMemAlloc(sizeof(*pService));
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274 |
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275 | if (!pService)
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276 | VBClFatalError(("Out of memory\n"));
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277 | pService->pInterface = &vbclDisplayInterface;
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278 | pService->magic = DISPLAYSTATE_MAGIC;
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279 | pService->mfInit = false;
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280 | return &pService->pInterface;
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281 | }
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