| 1 | /* $Id: main.cpp 55980 2015-05-20 17:35:22Z vboxsync $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * VirtualBox Guest Service:
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| 5 | * Linux guest.
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| 6 | */
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| 7 |
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| 8 | /*
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| 9 | * Copyright (C) 2006-2015 Oracle Corporation
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| 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License (GPL) as published by the Free Software
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| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | */
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| 19 |
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| 20 | #include <sys/types.h>
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| 21 | #include <stdlib.h> /* For exit */
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| 22 | #include <stdio.h>
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| 23 | #include <string.h>
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| 24 | #include <unistd.h>
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| 25 | #include <errno.h>
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| 26 | #include <poll.h>
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| 27 | #include <signal.h>
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| 28 |
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| 29 | #include <X11/Xlib.h>
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| 30 | #include <X11/Xatom.h>
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| 31 |
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| 32 | #include <iprt/buildconfig.h>
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| 33 | #include <iprt/critsect.h>
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| 34 | #include <iprt/env.h>
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| 35 | #include <iprt/file.h>
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| 36 | #include <iprt/initterm.h>
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| 37 | #include <iprt/message.h>
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| 38 | #include <iprt/path.h>
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| 39 | #include <iprt/param.h>
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| 40 | #include <iprt/stream.h>
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| 41 | #include <iprt/string.h>
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| 42 | #include <iprt/types.h>
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| 43 | #include <VBox/VBoxGuestLib.h>
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| 44 | #include <VBox/log.h>
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| 45 |
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| 46 | #include "VBoxClient.h"
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| 47 |
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| 48 | static int (*gpfnOldIOErrorHandler)(Display *) = NULL;
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| 49 |
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| 50 | /** Object representing the service we are running. This has to be global
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| 51 | * so that the cleanup routine can access it. */
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| 52 | struct VBCLSERVICE **g_pService;
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| 53 | /** The name of our pidfile. It is global for the benefit of the cleanup
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| 54 | * routine. */
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| 55 | static char g_szPidFile[RTPATH_MAX];
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| 56 | /** The file handle of our pidfile. It is global for the benefit of the
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| 57 | * cleanup routine. */
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| 58 | static RTFILE g_hPidFile;
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| 59 | /** Global critical section held during the clean-up routine (to prevent it
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| 60 | * being called on multiple threads at once) or things which may not happen
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| 61 | * during clean-up (e.g. pausing and resuming the service).
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| 62 | */
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| 63 | RTCRITSECT g_critSect;
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| 64 | /** Counter of how often our deamon has been respawned. */
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| 65 | unsigned cRespawn = 0;
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| 66 |
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| 67 | /** Exit with a fatal error. */
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| 68 | void vbclFatalError(char *pszMessage)
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| 69 | {
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| 70 | char *pszCommand;
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| 71 | if (pszMessage && cRespawn == 0)
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| 72 | {
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| 73 | pszCommand = RTStrAPrintf2("notify-send \"VBoxClient: %s\"", pszMessage);
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| 74 | if (pszCommand)
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| 75 | system(pszCommand);
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| 76 | }
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| 77 | _exit(1);
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| 78 | }
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| 79 |
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| 80 | /** Clean up if we get a signal or something. This is extern so that we
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| 81 | * can call it from other compilation units. */
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| 82 | void VBClCleanUp()
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| 83 | {
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| 84 | /* We never release this, as we end up with a call to exit(3) which is not
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| 85 | * async-safe. Unless we fix this application properly, we should be sure
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| 86 | * never to exit from anywhere except from this method. */
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| 87 | int rc = RTCritSectEnter(&g_critSect);
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| 88 | if (RT_FAILURE(rc))
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| 89 | VBClFatalError(("VBoxClient: Failure while acquiring the global critical section, rc=%Rrc\n", rc));
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| 90 | if (g_pService)
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| 91 | (*g_pService)->cleanup(g_pService);
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| 92 | if (g_szPidFile[0] && g_hPidFile)
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| 93 | VbglR3ClosePidFile(g_szPidFile, g_hPidFile);
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| 94 | exit(0);
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| 95 | }
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| 96 |
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| 97 | /**
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| 98 | * A standard signal handler which cleans up and exits.
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| 99 | */
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| 100 | static void vboxClientSignalHandler(int cSignal)
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| 101 | {
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| 102 | LogRel(("VBoxClient: terminated with signal %d\n", cSignal));
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| 103 | /** Disable seamless mode */
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| 104 | RTPrintf(("VBoxClient: terminating...\n"));
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| 105 | VBClCleanUp();
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| 106 | }
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| 107 |
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| 108 | /**
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| 109 | * Xlib error handler for certain errors that we can't avoid.
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| 110 | */
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| 111 | static int vboxClientXLibErrorHandler(Display *pDisplay, XErrorEvent *pError)
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| 112 | {
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| 113 | char errorText[1024];
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| 114 |
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| 115 | XGetErrorText(pDisplay, pError->error_code, errorText, sizeof(errorText));
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| 116 | LogRelFlow(("VBoxClient: an X Window protocol error occurred: %s (error code %d). Request code: %d, minor code: %d, serial number: %d\n", errorText, pError->error_code, pError->request_code, pError->minor_code, pError->serial));
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| 117 | return 0; /* We should never reach this. */
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| 118 | }
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| 119 |
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| 120 | /**
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| 121 | * Xlib error handler for fatal errors. This often means that the programme is still running
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| 122 | * when X exits.
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| 123 | */
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| 124 | static int vboxClientXLibIOErrorHandler(Display *pDisplay)
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| 125 | {
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| 126 | LogRel(("VBoxClient: a fatal guest X Window error occurred. This may just mean that the Window system was shut down while the client was still running.\n"));
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| 127 | VBClCleanUp();
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| 128 | return 0; /* We should never reach this. */
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| 129 | }
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| 130 |
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| 131 | /**
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| 132 | * Reset all standard termination signals to call our signal handler, which
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| 133 | * cleans up and exits.
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| 134 | */
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| 135 | static void vboxClientSetSignalHandlers(void)
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| 136 | {
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| 137 | struct sigaction sigAction;
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| 138 |
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| 139 | LogRelFlowFunc(("\n"));
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| 140 | sigAction.sa_handler = vboxClientSignalHandler;
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| 141 | sigemptyset(&sigAction.sa_mask);
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| 142 | sigAction.sa_flags = 0;
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| 143 | sigaction(SIGHUP, &sigAction, NULL);
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| 144 | sigaction(SIGINT, &sigAction, NULL);
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| 145 | sigaction(SIGQUIT, &sigAction, NULL);
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| 146 | sigaction(SIGPIPE, &sigAction, NULL);
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| 147 | sigaction(SIGALRM, &sigAction, NULL);
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| 148 | sigaction(SIGTERM, &sigAction, NULL);
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| 149 | sigaction(SIGUSR1, &sigAction, NULL);
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| 150 | sigaction(SIGUSR2, &sigAction, NULL);
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| 151 | LogRelFlowFunc(("returning\n"));
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| 152 | }
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| 153 |
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| 154 | /** Check whether X.Org has acquired or lost the current virtual terminal and
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| 155 | * call the service @a pause() or @a resume() call-back if appropriate.
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| 156 | * The functionality is provided by the vboxvideo driver for pre-1.16 X servers
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| 157 | * and by 1.16 and later series servers.
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| 158 | * This can either be called directly from a service's event loop or the service
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| 159 | * can call VBClStartVTMonitor() to start an event loop in a separate thread.
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| 160 | * Property notification for the root window should be selected first. Services
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| 161 | * are not required to check VT changes if they do not need the information.
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| 162 | * @param pEvent an event received on a display connection which will be
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| 163 | * checked to see if it is change to the XFree86_has_VT property
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| 164 | */
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| 165 | void VBClCheckXOrgVT(union _XEvent *pEvent)
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| 166 | {
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| 167 | Atom actualType;
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| 168 | int actualFormat;
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| 169 | unsigned long cItems, cbLeft;
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| 170 | bool fHasVT = false;
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| 171 | unsigned long *pValue;
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| 172 | int rc;
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| 173 | Display *pDisplay = pEvent->xany.display;
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| 174 | Atom hasVT = XInternAtom(pDisplay, "XFree86_has_VT", False);
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| 175 |
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| 176 | if ( pEvent->type != PropertyNotify
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| 177 | || pEvent->xproperty.window != DefaultRootWindow(pDisplay)
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| 178 | || pEvent->xproperty.atom != hasVT)
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| 179 | return;
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| 180 | XGetWindowProperty(pDisplay, DefaultRootWindow(pDisplay), hasVT, 0, 1,
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| 181 | False, XA_INTEGER, &actualType, &actualFormat, &cItems,
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| 182 | &cbLeft, (unsigned char **)&pValue);
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| 183 | if (cItems && actualFormat == 32)
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| 184 | {
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| 185 | fHasVT = *pValue != 0;
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| 186 | XFree(pValue);
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| 187 | }
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| 188 | else
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| 189 | return;
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| 190 | if (fHasVT)
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| 191 | {
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| 192 | rc = (*g_pService)->resume(g_pService);
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| 193 | if (RT_FAILURE(rc))
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| 194 | VBClFatalError(("Error resuming the service: %Rrc\n"));
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| 195 | }
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| 196 | if (!fHasVT)
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| 197 | {
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| 198 | rc = (*g_pService)->pause(g_pService);
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| 199 | if (RT_FAILURE(rc))
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| 200 | VBClFatalError(("Error pausing the service: %Rrc\n"));
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| 201 | }
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| 202 | }
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| 203 |
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| 204 | /**
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| 205 | * Thread which notifies the service when we switch to a different VT or back
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| 206 | * and cleans up when the X server exits.
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| 207 | * @note runs until programme exit.
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| 208 | */
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| 209 | static int pfnMonitorThread(RTTHREAD self, void *pvUser)
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| 210 | {
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| 211 | Display *pDisplay;
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| 212 | bool fHasVT = true;
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| 213 |
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| 214 | pDisplay = XOpenDisplay(NULL);
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| 215 | if (!pDisplay)
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| 216 | VBClFatalError(("Failed to open the X11 display\n"));
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| 217 | XSelectInput(pDisplay, DefaultRootWindow(pDisplay), PropertyChangeMask);
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| 218 | while (true)
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| 219 | {
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| 220 | XEvent event;
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| 221 |
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| 222 | XNextEvent(pDisplay, &event);
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| 223 | VBClCheckXOrgVT(&event);
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| 224 | }
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| 225 | return VINF_SUCCESS; /* Should never be reached. */
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| 226 | }
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| 227 |
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| 228 | /**
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| 229 | * Start a thread which notifies the service when we switch to a different
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| 230 | * VT or back, and terminates us when the X server exits. This should be called
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| 231 | * by most services which do not regularly run an X11 event loop.
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| 232 | */
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| 233 | int VBClStartVTMonitor()
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| 234 | {
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| 235 | return RTThreadCreate(NULL, pfnMonitorThread, NULL, 0,
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| 236 | RTTHREADTYPE_INFREQUENT_POLLER, 0, "MONITOR");
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| 237 | }
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| 238 |
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| 239 | /**
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| 240 | * Print out a usage message and exit with success.
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| 241 | */
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| 242 | void vboxClientUsage(const char *pcszFileName)
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| 243 | {
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| 244 | RTPrintf("Usage: %s --clipboard|"
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| 245 | #ifdef VBOX_WITH_DRAG_AND_DROP
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| 246 | "--draganddrop|"
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| 247 | #endif
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| 248 | "--display|"
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| 249 | # ifdef VBOX_WITH_GUEST_PROPS
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| 250 | "--checkhostversion|"
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| 251 | #endif
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| 252 | "--seamless [-d|--nodaemon]\n", pcszFileName);
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| 253 | RTPrintf("Starts the VirtualBox X Window System guest services.\n\n");
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| 254 | RTPrintf("Options:\n");
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| 255 | RTPrintf(" --clipboard starts the shared clipboard service\n");
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| 256 | #ifdef VBOX_WITH_DRAG_AND_DROP
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| 257 | RTPrintf(" --draganddrop starts the drag and drop service\n");
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| 258 | #endif
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| 259 | RTPrintf(" --display starts the display management service\n");
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| 260 | #ifdef VBOX_WITH_GUEST_PROPS
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| 261 | RTPrintf(" --checkhostversion starts the host version notifier service\n");
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| 262 | #endif
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| 263 | RTPrintf(" --seamless starts the seamless windows service\n");
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| 264 | RTPrintf(" -d, --nodaemon continues running as a system service\n");
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| 265 | RTPrintf(" -h, --help shows this help text\n");
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| 266 | RTPrintf(" -V, --version shows version information\n");
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| 267 | RTPrintf("\n");
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| 268 | exit(0);
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| 269 | }
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| 270 |
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| 271 | /**
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| 272 | * The main loop for the VBoxClient daemon.
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| 273 | * @todo Clean up for readability.
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| 274 | */
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| 275 | int main(int argc, char *argv[])
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| 276 | {
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| 277 | bool fDaemonise = true, fRespawn = true;
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| 278 | int rc;
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| 279 | const char *pcszFileName, *pcszStage;
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| 280 |
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| 281 | /* Initialise our runtime before all else. */
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| 282 | rc = RTR3InitExe(argc, &argv, 0);
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| 283 | if (RT_FAILURE(rc))
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| 284 | return RTMsgInitFailure(rc);
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| 285 | /* This should never be called twice in one process - in fact one Display
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| 286 | * object should probably never be used from multiple threads anyway. */
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| 287 | if (!XInitThreads())
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| 288 | VBClFatalError(("Failed to initialize X11 threads\n"));
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| 289 | /* Get our file name for error output. */
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| 290 | pcszFileName = RTPathFilename(argv[0]);
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| 291 | if (!pcszFileName)
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| 292 | pcszFileName = "VBoxClient";
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| 293 |
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| 294 | /* Parse our option(s) */
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| 295 | /** @todo Use RTGetOpt() if the arguments become more complex. */
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| 296 | for (int i = 1; i < argc; ++i)
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| 297 | {
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| 298 | rc = VERR_INVALID_PARAMETER;
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| 299 | if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--nodaemon"))
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| 300 | {
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| 301 | /* If the user is running in "no daemon" mode anyway, send critical
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| 302 | * logging to stdout as well. */
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| 303 | PRTLOGGER pReleaseLog = RTLogRelGetDefaultInstance();
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| 304 | if (pReleaseLog)
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| 305 | rc = RTLogDestinations(pReleaseLog, "stdout");
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| 306 | if (pReleaseLog && RT_FAILURE(rc))
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| 307 | RTPrintf("%s: failed to redivert error output, rc=%Rrc\n",
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| 308 | pcszFileName, rc);
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| 309 | fDaemonise = false;
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| 310 | }
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| 311 | else if (!strcmp(argv[i], "--no-respawn"))
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| 312 | {
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| 313 | fRespawn = false;
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| 314 | }
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| 315 | else if (!strcmp(argv[i], "--clipboard"))
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| 316 | {
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| 317 | if (g_pService)
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| 318 | break;
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| 319 | g_pService = VBClGetClipboardService();
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| 320 | }
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| 321 | else if (!strcmp(argv[i], "--display"))
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| 322 | {
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| 323 | if (g_pService)
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| 324 | break;
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| 325 | g_pService = VBClGetDisplayService();
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| 326 | }
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| 327 | else if (!strcmp(argv[i], "--seamless"))
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| 328 | {
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| 329 | if (g_pService)
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| 330 | break;
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| 331 | g_pService = VBClGetSeamlessService();
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| 332 | }
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| 333 | else if (!strcmp(argv[i], "--checkhostversion"))
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| 334 | {
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| 335 | if (g_pService)
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| 336 | break;
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| 337 | g_pService = VBClGetHostVersionService();
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| 338 | }
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| 339 | #ifdef VBOX_WITH_DRAG_AND_DROP
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| 340 | else if (!strcmp(argv[i], "--draganddrop"))
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| 341 | {
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| 342 | if (g_pService)
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| 343 | break;
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| 344 | g_pService = VBClGetDragAndDropService();
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| 345 | }
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| 346 | #endif /* VBOX_WITH_DRAG_AND_DROP */
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| 347 | else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help"))
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| 348 | {
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| 349 | vboxClientUsage(pcszFileName);
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| 350 | return 0;
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| 351 | }
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| 352 | else if (!strcmp(argv[i], "-V") || !strcmp(argv[i], "--version"))
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| 353 | {
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| 354 | RTPrintf("%sr%s\n", RTBldCfgVersion(), RTBldCfgRevisionStr());
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| 355 | return 0;
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| 356 | }
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| 357 | else
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| 358 | {
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| 359 | RTPrintf("%s: unrecognized option `%s'\n", pcszFileName, argv[i]);
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| 360 | RTPrintf("Try `%s --help' for more information\n", pcszFileName);
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| 361 | return 1;
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| 362 | }
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| 363 | rc = VINF_SUCCESS;
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| 364 | }
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| 365 | if (RT_FAILURE(rc) || !g_pService)
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| 366 | {
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| 367 | vboxClientUsage(pcszFileName);
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| 368 | return 1;
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| 369 | }
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| 370 |
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| 371 | rc = RTCritSectInit(&g_critSect);
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| 372 | if (RT_FAILURE(rc))
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| 373 | VBClFatalError(("Initialising critical section: %Rrc\n", rc));
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| 374 | rc = RTPathUserHome(g_szPidFile, sizeof(g_szPidFile));
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| 375 | if (RT_FAILURE(rc))
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| 376 | VBClFatalError(("Getting home directory for pid-file: %Rrc\n", rc));
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| 377 | rc = RTPathAppend(g_szPidFile, sizeof(g_szPidFile),
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| 378 | (*g_pService)->getPidFilePath());
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| 379 | if (RT_FAILURE(rc))
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| 380 | VBClFatalError(("Creating pid-file path: %Rrc\n", rc));
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| 381 | if (fDaemonise)
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| 382 | rc = VbglR3Daemonize(false /* fNoChDir */, false /* fNoClose */, fRespawn, &cRespawn);
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| 383 | if (RT_FAILURE(rc))
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| 384 | VBClFatalError(("Daemonizing: %Rrc\n", rc));
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| 385 | if (g_szPidFile[0])
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| 386 | rc = VbglR3PidFile(g_szPidFile, &g_hPidFile);
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| 387 | if (rc == VERR_FILE_LOCK_VIOLATION) /* Already running. */
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| 388 | return 0;
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|---|
| 389 | if (RT_FAILURE(rc))
|
|---|
| 390 | VBClFatalError(("Creating pid-file: %Rrc\n", rc));
|
|---|
| 391 | /* Set signal handlers to clean up on exit. */
|
|---|
| 392 | vboxClientSetSignalHandlers();
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|---|
| 393 | #ifndef VBOXCLIENT_WITHOUT_X11
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|---|
| 394 | /* Set an X11 error handler, so that we don't die when we get unavoidable
|
|---|
| 395 | * errors. */
|
|---|
| 396 | XSetErrorHandler(vboxClientXLibErrorHandler);
|
|---|
| 397 | /* Set an X11 I/O error handler, so that we can shutdown properly on
|
|---|
| 398 | * fatal errors. */
|
|---|
| 399 | XSetIOErrorHandler(vboxClientXLibIOErrorHandler);
|
|---|
| 400 | #endif
|
|---|
| 401 | rc = (*g_pService)->init(g_pService);
|
|---|
| 402 | if (RT_FAILURE(rc))
|
|---|
| 403 | VBClFatalError(("Initialising service: %Rrc\n", rc));
|
|---|
| 404 | rc = (*g_pService)->run(g_pService, fDaemonise);
|
|---|
| 405 | if (RT_FAILURE(rc))
|
|---|
| 406 | VBClFatalError(("Service main loop failed: %Rrc\n", rc));
|
|---|
| 407 | VBClCleanUp();
|
|---|
| 408 | return 0;
|
|---|
| 409 | }
|
|---|
