| 1 | /** @file
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| 2 | *
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| 3 | * VirtualBox Guest Service:
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| 4 | * Linux guest.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2006-2011 Oracle Corporation
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| 9 | *
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| 10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 11 | * available from http://www.virtualbox.org. This file is free software;
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| 12 | * you can redistribute it and/or modify it under the terms of the GNU
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| 13 | * General Public License (GPL) as published by the Free Software
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| 14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 17 | */
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| 18 |
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| 19 | #include <sys/types.h>
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| 20 | #include <stdlib.h> /* For exit */
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| 21 | #include <stdio.h>
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| 22 | #include <string.h>
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| 23 | #include <unistd.h>
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| 24 | #include <errno.h>
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| 25 | #include <poll.h>
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| 26 | #include <signal.h>
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| 27 |
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| 28 | #include <X11/Xlib.h>
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| 29 | #include <X11/Xatom.h>
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| 30 |
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| 31 | #include <iprt/critsect.h>
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| 32 | #include <iprt/env.h>
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| 33 | #include <iprt/file.h>
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| 34 | #include <iprt/initterm.h>
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| 35 | #include <iprt/message.h>
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| 36 | #include <iprt/path.h>
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| 37 | #include <iprt/param.h>
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| 38 | #include <iprt/stream.h>
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| 39 | #include <iprt/string.h>
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| 40 | #include <iprt/types.h>
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| 41 | #include <VBox/VBoxGuestLib.h>
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| 42 | #include <VBox/log.h>
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| 43 |
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| 44 | #include "VBoxClient.h"
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| 45 |
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| 46 | static int (*gpfnOldIOErrorHandler)(Display *) = NULL;
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| 47 |
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| 48 | /** Object representing the service we are running. This has to be global
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| 49 | * so that the cleanup routine can access it. */
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| 50 | VBoxClient::Service *g_pService;
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| 51 | /** The name of our pidfile. It is global for the benefit of the cleanup
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| 52 | * routine. */
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| 53 | static char g_szPidFile[RTPATH_MAX];
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| 54 | /** The file handle of our pidfile. It is global for the benefit of the
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| 55 | * cleanup routine. */
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| 56 | static RTFILE g_hPidFile;
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| 57 | /** Global critical section held during the clean-up routine (to prevent it
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| 58 | * being called on multiple threads at once) or things which may not happen
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| 59 | * during clean-up (e.g. pausing and resuming the service).
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| 60 | */
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| 61 | RTCRITSECT g_critSect;
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| 62 |
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| 63 | /** Clean up if we get a signal or something. This is extern so that we
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| 64 | * can call it from other compilation units. */
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| 65 | void VBoxClient::CleanUp()
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| 66 | {
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| 67 | /* We never release this, as we end up with a call to exit(3) which is not
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| 68 | * async-safe. Unless we fix this application properly, we should be sure
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| 69 | * never to exit from anywhere except from this method. */
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| 70 | int rc = RTCritSectEnter(&g_critSect);
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| 71 | if (RT_FAILURE(rc))
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| 72 | {
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| 73 | LogRel(("VBoxClient: Failure while acquiring the global critical section, rc=%Rrc\n", rc));
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| 74 | abort();
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| 75 | }
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| 76 | if (g_pService)
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| 77 | g_pService->cleanup();
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| 78 | if (g_szPidFile[0] && g_hPidFile)
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| 79 | VbglR3ClosePidFile(g_szPidFile, g_hPidFile);
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| 80 | VbglR3Term();
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| 81 | exit(0);
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| 82 | }
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| 83 |
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| 84 | /**
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| 85 | * A standard signal handler which cleans up and exits.
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| 86 | */
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| 87 | void vboxClientSignalHandler(int cSignal)
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| 88 | {
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| 89 | LogRel(("VBoxClient: terminated with signal %d\n", cSignal));
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| 90 | /** Disable seamless mode */
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| 91 | RTPrintf(("VBoxClient: terminating...\n"));
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| 92 | VBoxClient::CleanUp();
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| 93 | }
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| 94 |
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| 95 | /**
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| 96 | * Xlib error handler for certain errors that we can't avoid.
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| 97 | */
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| 98 | int vboxClientXLibErrorHandler(Display *pDisplay, XErrorEvent *pError)
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| 99 | {
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| 100 | char errorText[1024];
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| 101 |
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| 102 | XGetErrorText(pDisplay, pError->error_code, errorText, sizeof(errorText));
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| 103 | 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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| 104 | return 0; /* We should never reach this. */
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| 105 | }
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| 106 |
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| 107 | /**
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| 108 | * Xlib error handler for fatal errors. This often means that the programme is still running
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| 109 | * when X exits.
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| 110 | */
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| 111 | static int vboxClientXLibIOErrorHandler(Display *pDisplay)
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| 112 | {
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| 113 | 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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| 114 | VBoxClient::CleanUp();
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| 115 | return 0; /* We should never reach this. */
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| 116 | }
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| 117 |
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| 118 | /**
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| 119 | * Reset all standard termination signals to call our signal handler, which
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| 120 | * cleans up and exits.
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| 121 | */
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| 122 | void vboxClientSetSignalHandlers(void)
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| 123 | {
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| 124 | struct sigaction sigAction;
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| 125 |
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| 126 | LogRelFlowFunc(("\n"));
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| 127 | sigAction.sa_handler = vboxClientSignalHandler;
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| 128 | sigemptyset(&sigAction.sa_mask);
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| 129 | sigAction.sa_flags = 0;
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| 130 | sigaction(SIGHUP, &sigAction, NULL);
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| 131 | sigaction(SIGINT, &sigAction, NULL);
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| 132 | sigaction(SIGQUIT, &sigAction, NULL);
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| 133 | sigaction(SIGPIPE, &sigAction, NULL);
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| 134 | sigaction(SIGALRM, &sigAction, NULL);
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| 135 | sigaction(SIGTERM, &sigAction, NULL);
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| 136 | sigaction(SIGUSR1, &sigAction, NULL);
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| 137 | sigaction(SIGUSR2, &sigAction, NULL);
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| 138 | LogRelFlowFunc(("returning\n"));
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| 139 | }
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| 140 |
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| 141 | /** Connect to the X server and return the "XFree86_VT" root window property,
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| 142 | * or 0 on failure. */
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| 143 | static unsigned long getXOrgVT(Display *pDisplay)
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| 144 | {
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| 145 | Atom actualType;
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| 146 | int actualFormat;
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| 147 | unsigned long cItems, cbLeft, cVT = 0;
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| 148 | unsigned long *pValue;
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| 149 |
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| 150 | XGetWindowProperty(pDisplay, DefaultRootWindow(pDisplay),
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| 151 | XInternAtom(pDisplay, "XFree86_VT", False), 0, 1, False,
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| 152 | XA_INTEGER, &actualType, &actualFormat, &cItems, &cbLeft,
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| 153 | (unsigned char **)&pValue);
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| 154 | if (cItems && actualFormat == 32)
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| 155 | {
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| 156 | cVT = *pValue;
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| 157 | XFree(pValue);
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| 158 | }
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| 159 | return cVT;
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| 160 | }
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| 161 |
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| 162 | /** Check whether the current virtual terminal is the one running the X server.
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| 163 | */
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| 164 | static void checkVTSysfs(RTFILE hFile, uint32_t cVT)
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| 165 | {
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| 166 | char szTTY[7] = "";
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| 167 | uint32_t cTTY;
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| 168 | size_t cbRead;
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| 169 | int rc;
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| 170 | const char *pcszStage;
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| 171 |
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| 172 | do {
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| 173 | pcszStage = "reading /sys/class/tty/tty0/active";
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| 174 | rc = RTFileReadAt(hFile, 0, (void *)szTTY, sizeof(szTTY), &cbRead);
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| 175 | if (RT_FAILURE(rc))
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| 176 | break;
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| 177 | szTTY[cbRead - 1] = '\0';
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| 178 | pcszStage = "getting VT number from sysfs file";
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| 179 | rc = RTStrToUInt32Full(&szTTY[3], 10, &cTTY);
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| 180 | if (RT_FAILURE(rc))
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| 181 | break;
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| 182 | pcszStage = "entering critical section";
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| 183 | rc = RTCritSectEnter(&g_critSect);
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| 184 | if (RT_FAILURE(rc))
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| 185 | break;
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| 186 | pcszStage = "asking service to pause or resume";
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| 187 | if (cTTY == cVT)
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| 188 | rc = g_pService->resume();
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| 189 | else
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| 190 | rc = g_pService->pause();
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| 191 | if (RT_FAILURE(rc))
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| 192 | break;
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| 193 | pcszStage = "leaving critical section";
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| 194 | rc = RTCritSectLeave(&g_critSect);
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| 195 | } while(false);
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| 196 | if (RT_FAILURE(rc))
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| 197 | {
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| 198 | LogRelFunc(("VBoxClient: failed at stage: \"%s\" rc: %Rrc cVT: %d szTTY: %s.\n",
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| 199 | pcszStage, rc, (int) cVT, szTTY));
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| 200 | if (RTCritSectIsOwner(&g_critSect))
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| 201 | RTCritSectLeave(&g_critSect);
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| 202 | VBoxClient::CleanUp();
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| 203 | }
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| 204 | }
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| 205 |
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| 206 | /** Poll for TTY changes using sysfs and for X server disconnection.
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| 207 | * Reading from the start of the pollable file "/sys/class/tty/tty0/active"
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| 208 | * returns the currently active TTY as a string of the form "tty<n>", with n
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| 209 | * greater than zero. Polling for POLLPRI returns when the TTY changes.
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| 210 | * @a cVT should be zero if we do not know the X server's VT. */
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| 211 | static void pollTTYAndXServer(Display *pDisplay, uint32_t cVT)
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| 212 | {
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| 213 | RTFILE hFile = NIL_RTFILE;
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| 214 | struct pollfd pollFD[2];
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| 215 | unsigned cPollFD = 1;
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| 216 | int rc;
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| 217 |
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| 218 | pollFD[1].fd = -1;
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| 219 | pollFD[1].revents = 0;
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| 220 | /* This block could be Linux-only, but keeping it on Solaris too, where it
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| 221 | * should just fail gracefully, gives us more code path coverage. */
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| 222 | if (cVT)
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| 223 | {
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| 224 | rc = RTFileOpen(&hFile, "/sys/class/tty/tty0/active",
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| 225 | RTFILE_O_READ | RTFILE_O_DENY_NONE | RTFILE_O_OPEN);
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| 226 | if (RT_SUCCESS(rc))
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| 227 | {
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| 228 | pollFD[1].fd = RTFileToNative(hFile);
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| 229 | pollFD[1].events = POLLPRI;
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| 230 | cPollFD = 2;
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| 231 | }
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| 232 | }
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| 233 | AssertRelease(pollFD[1].fd >= 0 || cPollFD == 1);
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| 234 | pollFD[0].fd = ConnectionNumber(pDisplay);
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| 235 | pollFD[0].events = POLLIN;
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| 236 | while (true)
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| 237 | {
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| 238 | if (hFile != NIL_RTFILE)
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| 239 | checkVTSysfs(hFile, cVT);
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| 240 | /* The only point of this loop is to trigger the I/O error handler if
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| 241 | * appropriate. */
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| 242 | while (XPending(pDisplay))
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| 243 | {
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| 244 | XEvent ev;
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| 245 |
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| 246 | XNextEvent(pDisplay, &ev);
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| 247 | }
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| 248 | /* If we get caught in a tight loop for some reason try to limit the
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| 249 | * damage. */
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| 250 | if (poll(pollFD, cPollFD, 0) > 0)
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| 251 | {
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| 252 | LogRel(("Monitor thread: unexpectedly fast event, revents=0x%x, 0x%x.\n",
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| 253 | pollFD[0].revents, pollFD[1].revents));
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| 254 | RTThreadYield();
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| 255 | }
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| 256 | if ( (poll(pollFD, cPollFD, -1) < 0 && errno != EINTR)
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| 257 | || pollFD[0].revents & POLLNVAL
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| 258 | || pollFD[1].revents & POLLNVAL)
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| 259 | {
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| 260 | LogRel(("Monitor thread: poll failed, stopping.\n"));
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| 261 | VBoxClient::CleanUp();
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| 262 | }
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | /**
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| 267 | * Thread which notifies the service when we switch to a different VT or back
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| 268 | * and cleans up when the X server exits.
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| 269 | * @note runs until programme exit.
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| 270 | */
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| 271 | static int pfnMonitorThread(RTTHREAD self, void *pvUser)
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| 272 | {
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| 273 | Display *pDisplay;
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| 274 | unsigned long cVT;
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| 275 | RTFILE hFile;
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| 276 |
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| 277 | pDisplay = XOpenDisplay(NULL);
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| 278 | if (!pDisplay)
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| 279 | return VINF_SUCCESS;
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| 280 | cVT = getXOrgVT(pDisplay);
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| 281 | /* Note: cVT will be 0 if we failed to get it. This is valid. */
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| 282 | pollTTYAndXServer(pDisplay, (uint32_t) cVT);
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| 283 | /* Should never get here. */
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| 284 | return VINF_SUCCESS;
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| 285 | }
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| 286 |
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| 287 | /**
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| 288 | * Start the thread which notifies the service when we switch to a different
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| 289 | * VT or back, and terminates us when the X server exits. The first is best
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| 290 | * effort functionality: XFree86 4.3 and older do not report their VT via the
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| 291 | * "XFree86_VT" root window property at all, and pre-2.6.38 Linux does not
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| 292 | * provide the interface in "sysfs" which we use. If there is a need for this
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| 293 | * to work with pre-2.6.38 Linux we can send the VT_GETSTATE ioctl to
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| 294 | * /dev/console at regular intervals.
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| 295 | */
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| 296 | static int startMonitorThread()
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| 297 | {
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| 298 | return RTThreadCreate(NULL, pfnMonitorThread, NULL, 0,
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| 299 | RTTHREADTYPE_INFREQUENT_POLLER, 0, "MONITOR");
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| 300 | }
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| 301 |
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| 302 | /**
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| 303 | * Print out a usage message and exit with success.
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| 304 | */
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| 305 | void vboxClientUsage(const char *pcszFileName)
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| 306 | {
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| 307 | RTPrintf("Usage: %s --clipboard|"
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| 308 | #ifdef VBOX_WITH_DRAG_AND_DROP
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| 309 | "--draganddrop|"
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| 310 | #endif
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| 311 | "--display|"
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| 312 | # ifdef VBOX_WITH_GUEST_PROPS
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| 313 | "--checkhostversion|"
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| 314 | #endif
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| 315 | "--seamless [-d|--nodaemon]\n", pcszFileName);
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| 316 | RTPrintf("Start the VirtualBox X Window System guest services.\n\n");
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| 317 | RTPrintf("Options:\n");
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| 318 | RTPrintf(" --clipboard start the shared clipboard service\n");
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| 319 | #ifdef VBOX_WITH_DRAG_AND_DROP
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| 320 | RTPrintf(" --draganddrop start the drag and drop service\n");
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| 321 | #endif
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| 322 | RTPrintf(" --display start the display management service\n");
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| 323 | #ifdef VBOX_WITH_GUEST_PROPS
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| 324 | RTPrintf(" --checkhostversion start the host version notifier service\n");
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| 325 | #endif
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| 326 | RTPrintf(" --seamless start the seamless windows service\n");
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| 327 | RTPrintf(" -d, --nodaemon continue running as a system service\n");
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| 328 | RTPrintf("\n");
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| 329 | exit(0);
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| 330 | }
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| 331 |
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| 332 | /**
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| 333 | * The main loop for the VBoxClient daemon.
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| 334 | */
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| 335 | int main(int argc, char *argv[])
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| 336 | {
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| 337 | if (!XInitThreads())
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| 338 | return 1;
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| 339 | /* Initialise our runtime before all else. */
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| 340 | int rc = RTR3InitExe(argc, &argv, 0);
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| 341 | if (RT_FAILURE(rc))
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| 342 | return RTMsgInitFailure(rc);
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| 343 |
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| 344 | int rcClipboard;
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| 345 | const char *pszFileName = RTPathFilename(argv[0]);
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| 346 | bool fDaemonise = true;
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| 347 | /* Have any fatal errors occurred yet? */
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| 348 | bool fSuccess = true;
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| 349 | /* Do we know which service we wish to run? */
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| 350 | bool fHaveService = false;
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| 351 |
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| 352 | if (NULL == pszFileName)
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| 353 | pszFileName = "VBoxClient";
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| 354 |
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| 355 | /* Initialise our global clean-up critical section */
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| 356 | rc = RTCritSectInit(&g_critSect);
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| 357 | if (RT_FAILURE(rc))
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| 358 | {
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| 359 | /* Of course, this should never happen. */
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| 360 | RTPrintf("%s: Failed to initialise the global critical section, rc=%Rrc\n", pszFileName, rc);
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| 361 | return 1;
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| 362 | }
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| 363 |
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| 364 | /* Parse our option(s) */
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| 365 | /** @todo Use RTGetOpt() if the arguments become more complex. */
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| 366 | for (int i = 1; i < argc; ++i)
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| 367 | {
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| 368 | if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--nodaemon"))
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| 369 | fDaemonise = false;
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| 370 | else if (!strcmp(argv[i], "--clipboard"))
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| 371 | {
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| 372 | if (g_pService == NULL)
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| 373 | g_pService = VBoxClient::GetClipboardService();
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| 374 | else
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| 375 | fSuccess = false;
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| 376 | }
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| 377 | else if (!strcmp(argv[i], "--display"))
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| 378 | {
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| 379 | if (g_pService == NULL)
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| 380 | g_pService = VBoxClient::GetDisplayService();
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| 381 | else
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| 382 | fSuccess = false;
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| 383 | }
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| 384 | else if (!strcmp(argv[i], "--seamless"))
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| 385 | {
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| 386 | if (g_pService == NULL)
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| 387 | g_pService = VBoxClient::GetSeamlessService();
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| 388 | else
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| 389 | fSuccess = false;
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| 390 | }
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| 391 | else if (!strcmp(argv[i], "--checkhostversion"))
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| 392 | {
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| 393 | if (g_pService == NULL)
|
|---|
| 394 | g_pService = VBoxClient::GetHostVersionService();
|
|---|
| 395 | else
|
|---|
| 396 | fSuccess = false;
|
|---|
| 397 | }
|
|---|
| 398 | #ifdef VBOX_WITH_DRAG_AND_DROP
|
|---|
| 399 | else if (!strcmp(argv[i], "--draganddrop"))
|
|---|
| 400 | {
|
|---|
| 401 | if (g_pService == NULL)
|
|---|
| 402 | g_pService = VBoxClient::GetDragAndDropService();
|
|---|
| 403 | else
|
|---|
| 404 | fSuccess = false;
|
|---|
| 405 | }
|
|---|
| 406 | #endif /* VBOX_WITH_DRAG_AND_DROP */
|
|---|
| 407 | else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help"))
|
|---|
| 408 | {
|
|---|
| 409 | vboxClientUsage(pszFileName);
|
|---|
| 410 | return 0;
|
|---|
| 411 | }
|
|---|
| 412 | else
|
|---|
| 413 | {
|
|---|
| 414 | RTPrintf("%s: unrecognized option `%s'\n", pszFileName, argv[i]);
|
|---|
| 415 | RTPrintf("Try `%s --help' for more information\n", pszFileName);
|
|---|
| 416 | return 1;
|
|---|
| 417 | }
|
|---|
| 418 | }
|
|---|
| 419 | if (!fSuccess || !g_pService)
|
|---|
| 420 | {
|
|---|
| 421 | vboxClientUsage(pszFileName);
|
|---|
| 422 | return 1;
|
|---|
| 423 | }
|
|---|
| 424 | /* Get the path for the pidfiles */
|
|---|
| 425 | rc = RTPathUserHome(g_szPidFile, sizeof(g_szPidFile));
|
|---|
| 426 | if (RT_FAILURE(rc))
|
|---|
| 427 | {
|
|---|
| 428 | RTPrintf("VBoxClient: failed to get home directory, rc=%Rrc. Exiting.\n", rc);
|
|---|
| 429 | LogRel(("VBoxClient: failed to get home directory, rc=%Rrc. Exiting.\n", rc));
|
|---|
| 430 | return 1;
|
|---|
| 431 | }
|
|---|
| 432 | rc = RTPathAppend(g_szPidFile, sizeof(g_szPidFile), g_pService->getPidFilePath());
|
|---|
| 433 | if (RT_FAILURE(rc))
|
|---|
| 434 | {
|
|---|
| 435 | RTPrintf("VBoxClient: RTPathAppend failed with rc=%Rrc. Exiting.\n", rc);
|
|---|
| 436 | LogRel(("VBoxClient: RTPathAppend failed with rc=%Rrc. Exiting.\n", rc));
|
|---|
| 437 | return 1;
|
|---|
| 438 | }
|
|---|
| 439 |
|
|---|
| 440 | /* Initialise the guest library. */
|
|---|
| 441 | if (RT_FAILURE(VbglR3InitUser()))
|
|---|
| 442 | {
|
|---|
| 443 | RTPrintf("Failed to connect to the VirtualBox kernel service\n");
|
|---|
| 444 | LogRel(("Failed to connect to the VirtualBox kernel service\n"));
|
|---|
| 445 | return 1;
|
|---|
| 446 | }
|
|---|
| 447 | if (fDaemonise)
|
|---|
| 448 | {
|
|---|
| 449 | rc = VbglR3Daemonize(false /* fNoChDir */, false /* fNoClose */);
|
|---|
| 450 | if (RT_FAILURE(rc))
|
|---|
| 451 | {
|
|---|
| 452 | RTPrintf("VBoxClient: failed to daemonize. Exiting.\n");
|
|---|
| 453 | LogRel(("VBoxClient: failed to daemonize. Exiting.\n"));
|
|---|
| 454 | # ifdef DEBUG
|
|---|
| 455 | RTPrintf("Error %Rrc\n", rc);
|
|---|
| 456 | # endif
|
|---|
| 457 | return 1;
|
|---|
| 458 | }
|
|---|
| 459 | }
|
|---|
| 460 | if (g_szPidFile[0] && RT_FAILURE(VbglR3PidFile(g_szPidFile, &g_hPidFile)))
|
|---|
| 461 | {
|
|---|
| 462 | RTPrintf("Failed to create a pidfile. Exiting.\n");
|
|---|
| 463 | LogRel(("Failed to create a pidfile. Exiting.\n"));
|
|---|
| 464 | VbglR3Term();
|
|---|
| 465 | return 1;
|
|---|
| 466 | }
|
|---|
| 467 | /* Set signal handlers to clean up on exit. */
|
|---|
| 468 | vboxClientSetSignalHandlers();
|
|---|
| 469 | /* Set an X11 error handler, so that we don't die when we get unavoidable errors. */
|
|---|
| 470 | XSetErrorHandler(vboxClientXLibErrorHandler);
|
|---|
| 471 | /* Set an X11 I/O error handler, so that we can shutdown properly on fatal errors. */
|
|---|
| 472 | XSetIOErrorHandler(vboxClientXLibIOErrorHandler);
|
|---|
| 473 | rc = g_pService->init();
|
|---|
| 474 | if (RT_FAILURE(rc))
|
|---|
| 475 | {
|
|---|
| 476 | LogRel(("VBoxClient: failed to initialise the service (%Rrc). Exiting.\n",
|
|---|
| 477 | rc));
|
|---|
| 478 | VbglR3Term();
|
|---|
| 479 | return 1;
|
|---|
| 480 | }
|
|---|
| 481 | rc = startMonitorThread();
|
|---|
| 482 | if (RT_FAILURE(rc))
|
|---|
| 483 | {
|
|---|
| 484 | LogRel(("Failed to start the monitor thread (%Rrc). Exiting.\n",
|
|---|
| 485 | rc));
|
|---|
| 486 | VBoxClient::CleanUp();
|
|---|
| 487 | }
|
|---|
| 488 | g_pService->run(fDaemonise);
|
|---|
| 489 | VBoxClient::CleanUp();
|
|---|
| 490 | return 1; /* We should never get here. */
|
|---|
| 491 | }
|
|---|
