/* $Id: VBoxServiceTimeSync.cpp 44529 2013-02-04 15:54:15Z vboxsync $ */ /** @file * VBoxService - Guest Additions TimeSync Service. */ /* * Copyright (C) 2007-2012 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /** @page pg_vboxservice_timesync The Time Sync Service * * The time sync service plays along with the Time Manager (TM) in the VMM * to keep the guest time accurate using the host machine as reference. * TM will try its best to make sure all timer ticks gets delivered so that * there isn't normally any need to adjust the guest time. * * There are three normal (= acceptable) cases: * -# When the service starts up. This is because ticks and such might * be lost during VM and OS startup. (Need to figure out exactly why!) * -# When the TM is unable to deliver all the ticks and swallows a * backlog of ticks. The threshold for this is configurable with * a default of 60 seconds. * -# The time is adjusted on the host. This can be caused manually by * the user or by some time sync daemon (NTP, LAN server, etc.). * * There are a number of very odd case where adjusting is needed. Here * are some of them: * -# Timer device emulation inaccuracies (like rounding). * -# Inaccuracies in time source VirtualBox uses. * -# The Guest and/or Host OS doesn't perform proper time keeping. This * come about as a result of OS and/or hardware issues. * * The TM is our source for the host time and will make adjustments for * current timer delivery lag. The simplistic approach taken by TM is to * adjust the host time by the current guest timer delivery lag, meaning that * if the guest is behind 1 second with PIT/RTC/++ ticks this should be reflected * in the guest wall time as well. * * Now, there is any amount of trouble we can cause by changing the time. * Most applications probably uses the wall time when they need to measure * things. A walltime that is being juggled about every so often, even if just * a little bit, could occasionally upset these measurements by for instance * yielding negative results. * * This bottom line here is that the time sync service isn't really supposed * to do anything and will try avoid having to do anything when possible. * * The implementation uses the latency it takes to query host time as the * absolute maximum precision to avoid messing up under timer tick catchup * and/or heavy host/guest load. (Rational is that a *lot* of stuff may happen * on our way back from ring-3 and TM/VMMDev since we're taking the route * thru the inner EM loop with it's force action processing.) * * But this latency has to be measured from our perspective, which means it * could just as easily come out as 0. (OS/2 and Windows guest only updates * the current time when the timer ticks for instance.) The good thing is * that this isn't really a problem since we won't ever do anything unless * the drift is noticeable. * * It now boils down to these three (configuration) factors: * -# g_TimesyncMinAdjust - The minimum drift we will ever bother with. * -# g_TimesyncLatencyFactor - The factor we multiply the latency by to * calculate the dynamic minimum adjust factor. * -# g_TimesyncMaxLatency - When to start discarding the data as utterly * useless and take a rest (someone is too busy to give us good data). * -# g_TimeSyncSetThreshold - The threshold at which we will just set the time * instead of trying to adjust it (milliseconds). */ /******************************************************************************* * Header Files * *******************************************************************************/ #ifdef RT_OS_WINDOWS # include # include /** @todo r=bird: Why is this here? Windows.h should include winbase.h... */ #else # include # include # include # include #endif #include #include #include #include #include #include #include "VBoxServiceInternal.h" #include "VBoxServiceUtils.h" /******************************************************************************* * Global Variables * *******************************************************************************/ /** The timesync interval (milliseconds). */ uint32_t g_TimeSyncInterval = 0; /** * @see pg_vboxservice_timesync * * @remark OS/2: There is either a 1 second resolution on the DosSetDateTime * API or a but in the settimeofday implementation. Thus, don't * bother unless there is at least a 1 second drift. */ #ifdef RT_OS_OS2 static uint32_t g_TimeSyncMinAdjust = 1000; #else static uint32_t g_TimeSyncMinAdjust = 100; #endif /** @see pg_vboxservice_timesync */ static uint32_t g_TimeSyncLatencyFactor = 8; /** @see pg_vboxservice_timesync */ static uint32_t g_TimeSyncMaxLatency = 250; /** @see pg_vboxservice_timesync */ static uint32_t g_TimeSyncSetThreshold = 20*60*1000; /** Whether the next adjustment should just set the time instead of trying to * adjust it. This is used to implement --timesync-set-start. */ static bool volatile g_fTimeSyncSetNext = false; /** Whether to set the time when the VM was restored. */ static bool g_fTimeSyncSetOnRestore = true; /** Current error count. Used to knowing when to bitch and when not to. */ static uint32_t g_cTimeSyncErrors = 0; /** The semaphore we're blocking on. */ static RTSEMEVENTMULTI g_TimeSyncEvent = NIL_RTSEMEVENTMULTI; /** The VM session ID. Changes whenever the VM is restored or reset. */ static uint64_t g_idTimeSyncSession; #ifdef RT_OS_WINDOWS /** Process token. */ static HANDLE g_hTokenProcess = NULL; /** Old token privileges. */ static TOKEN_PRIVILEGES g_TkOldPrivileges; /** Backup values for time adjustment. */ static DWORD g_dwWinTimeAdjustment; static DWORD g_dwWinTimeIncrement; static BOOL g_bWinTimeAdjustmentDisabled; #endif /** @copydoc VBOXSERVICE::pfnPreInit */ static DECLCALLBACK(int) VBoxServiceTimeSyncPreInit(void) { #ifdef VBOX_WITH_GUEST_PROPS /** @todo Merge this function with VBoxServiceTimeSyncOption() to generalize * the "command line args override guest property values" behavior. */ /* * Read the service options from the VM's guest properties. * Note that these options can be overridden by the command line options later. */ uint32_t uGuestPropSvcClientID; int rc = VbglR3GuestPropConnect(&uGuestPropSvcClientID); if (RT_FAILURE(rc)) { if (rc == VERR_HGCM_SERVICE_NOT_FOUND) /* Host service is not available. */ { VBoxServiceVerbose(0, "VMInfo: Guest property service is not available, skipping\n"); rc = VINF_SUCCESS; } else VBoxServiceError("Failed to connect to the guest property service! Error: %Rrc\n", rc); } else { rc = VBoxServiceReadPropUInt32(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-interval", &g_TimeSyncInterval, 50, UINT32_MAX - 1); if ( RT_SUCCESS(rc) || rc == VERR_NOT_FOUND) { rc = VBoxServiceReadPropUInt32(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-min-adjust", &g_TimeSyncMinAdjust, 0, 3600000); } if ( RT_SUCCESS(rc) || rc == VERR_NOT_FOUND) { rc = VBoxServiceReadPropUInt32(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-latency-factor", &g_TimeSyncLatencyFactor, 1, 1024); } if ( RT_SUCCESS(rc) || rc == VERR_NOT_FOUND) { rc = VBoxServiceReadPropUInt32(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-max-latency", &g_TimeSyncMaxLatency, 1, 3600000); } if ( RT_SUCCESS(rc) || rc == VERR_NOT_FOUND) { rc = VBoxServiceReadPropUInt32(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-set-threshold", &g_TimeSyncSetThreshold, 0, 7*24*60*60*1000 /* a week */); } if ( RT_SUCCESS(rc) || rc == VERR_NOT_FOUND) { char *pszValue; rc = VBoxServiceReadProp(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-set-start", &pszValue, NULL /* ppszFlags */, NULL /* puTimestamp */); if (RT_SUCCESS(rc)) { g_fTimeSyncSetNext = true; RTStrFree(pszValue); } } if ( RT_SUCCESS(rc) || rc == VERR_NOT_FOUND) { uint32_t value; rc = VBoxServiceReadPropUInt32(uGuestPropSvcClientID, "/VirtualBox/GuestAdd/VBoxService/--timesync-set-on-restore", &value, 1, 1); if (RT_SUCCESS(rc)) g_fTimeSyncSetOnRestore = !!value; } VbglR3GuestPropDisconnect(uGuestPropSvcClientID); } if (rc == VERR_NOT_FOUND) /* If a value is not found, don't be sad! */ rc = VINF_SUCCESS; return rc; #else /* Nothing to do here yet. */ return VINF_SUCCESS; #endif } /** @copydoc VBOXSERVICE::pfnOption */ static DECLCALLBACK(int) VBoxServiceTimeSyncOption(const char **ppszShort, int argc, char **argv, int *pi) { int rc = -1; uint32_t value; if (ppszShort) /* no short options */; else if (!strcmp(argv[*pi], "--timesync-interval")) rc = VBoxServiceArgUInt32(argc, argv, "", pi, &g_TimeSyncInterval, 50, UINT32_MAX - 1); else if (!strcmp(argv[*pi], "--timesync-min-adjust")) rc = VBoxServiceArgUInt32(argc, argv, "", pi, &g_TimeSyncMinAdjust, 0, 3600000); else if (!strcmp(argv[*pi], "--timesync-latency-factor")) rc = VBoxServiceArgUInt32(argc, argv, "", pi, &g_TimeSyncLatencyFactor, 1, 1024); else if (!strcmp(argv[*pi], "--timesync-max-latency")) rc = VBoxServiceArgUInt32(argc, argv, "", pi, &g_TimeSyncMaxLatency, 1, 3600000); else if (!strcmp(argv[*pi], "--timesync-set-threshold")) rc = VBoxServiceArgUInt32(argc, argv, "", pi, &g_TimeSyncSetThreshold, 0, 7*24*60*60*1000); /* a week */ else if (!strcmp(argv[*pi], "--timesync-set-start")) { g_fTimeSyncSetNext = true; rc = VINF_SUCCESS; } else if (!strcmp(argv[*pi], "--timesync-set-on-restore")) { rc = VBoxServiceArgUInt32(argc, argv, "", pi, &value, 1, 1); if (RT_SUCCESS(rc)) g_fTimeSyncSetOnRestore = !!value; } return rc; } /** @copydoc VBOXSERVICE::pfnInit */ static DECLCALLBACK(int) VBoxServiceTimeSyncInit(void) { /* * If not specified, find the right interval default. * Then create the event sem to block on. */ if (!g_TimeSyncInterval) g_TimeSyncInterval = g_DefaultInterval * 1000; if (!g_TimeSyncInterval) g_TimeSyncInterval = 10 * 1000; VbglR3GetSessionId(&g_idTimeSyncSession); /* The status code is ignored as this information is not available with VBox < 3.2.10. */ int rc = RTSemEventMultiCreate(&g_TimeSyncEvent); AssertRC(rc); #ifdef RT_OS_WINDOWS if (RT_SUCCESS(rc)) { /* * Adjust privileges of this process so we can make system time adjustments. */ if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &g_hTokenProcess)) { TOKEN_PRIVILEGES tkPriv; RT_ZERO(tkPriv); tkPriv.PrivilegeCount = 1; tkPriv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; if (LookupPrivilegeValue(NULL, SE_SYSTEMTIME_NAME, &tkPriv.Privileges[0].Luid)) { DWORD cbRet = sizeof(g_TkOldPrivileges); if (AdjustTokenPrivileges(g_hTokenProcess, FALSE, &tkPriv, sizeof(TOKEN_PRIVILEGES), &g_TkOldPrivileges, &cbRet)) rc = VINF_SUCCESS; else { DWORD dwErr = GetLastError(); rc = RTErrConvertFromWin32(dwErr); VBoxServiceError("VBoxServiceTimeSyncInit: Adjusting token privileges (SE_SYSTEMTIME_NAME) failed with status code %u/%Rrc!\n", dwErr, rc); } } else { DWORD dwErr = GetLastError(); rc = RTErrConvertFromWin32(dwErr); VBoxServiceError("VBoxServiceTimeSyncInit: Looking up token privileges (SE_SYSTEMTIME_NAME) failed with status code %u/%Rrc!\n", dwErr, rc); } if (RT_FAILURE(rc)) { CloseHandle(g_hTokenProcess); g_hTokenProcess = NULL; } } else { DWORD dwErr = GetLastError(); rc = RTErrConvertFromWin32(dwErr); VBoxServiceError("VBoxServiceTimeSyncInit: Opening process token (SE_SYSTEMTIME_NAME) failed with status code %u/%Rrc!\n", dwErr, rc); g_hTokenProcess = NULL; } } if (GetSystemTimeAdjustment(&g_dwWinTimeAdjustment, &g_dwWinTimeIncrement, &g_bWinTimeAdjustmentDisabled)) VBoxServiceVerbose(3, "VBoxServiceTimeSyncInit: Initially %ld (100ns) units per %ld (100 ns) units interval, disabled=%d\n", g_dwWinTimeAdjustment, g_dwWinTimeIncrement, g_bWinTimeAdjustmentDisabled ? 1 : 0); else { DWORD dwErr = GetLastError(); rc = RTErrConvertFromWin32(dwErr); VBoxServiceError("VBoxServiceTimeSyncInit: Could not get time adjustment values! Last error: %ld!\n", dwErr); } #endif /* RT_OS_WINDOWS */ return rc; } /** * Try adjust the time using adjtime or similar. * * @returns true on success, false on failure. * * @param pDrift The time adjustment. */ static bool VBoxServiceTimeSyncAdjust(PCRTTIMESPEC pDrift) { #ifdef RT_OS_WINDOWS /** @todo r=bird: NT4 doesn't have GetSystemTimeAdjustment according to MSDN. */ /** @todo r=bird: g_hTokenProcess cannot be NULL here. * VBoxServiceTimeSyncInit will fail and the service will not be * started with it being NULL. VBoxServiceTimeSyncInit OTOH will *NOT* * be called until the service thread has terminated. If anything * else is the case, there is buggy code somewhere.*/ if (g_hTokenProcess == NULL) /* Is the token already closed when shutting down? */ return false; DWORD dwWinTimeAdjustment, dwWinNewTimeAdjustment, dwWinTimeIncrement; BOOL fWinTimeAdjustmentDisabled; if (GetSystemTimeAdjustment(&dwWinTimeAdjustment, &dwWinTimeIncrement, &fWinTimeAdjustmentDisabled)) { DWORD dwDiffMax = g_dwWinTimeAdjustment * 0.50; DWORD dwDiffNew = dwWinTimeAdjustment * 0.10; if (RTTimeSpecGetMilli(pDrift) > 0) { dwWinNewTimeAdjustment = dwWinTimeAdjustment + dwDiffNew; if (dwWinNewTimeAdjustment > (g_dwWinTimeAdjustment + dwDiffMax)) { dwWinNewTimeAdjustment = g_dwWinTimeAdjustment + dwDiffMax; dwDiffNew = dwDiffMax; } } else { dwWinNewTimeAdjustment = dwWinTimeAdjustment - dwDiffNew; if (dwWinNewTimeAdjustment < (g_dwWinTimeAdjustment - dwDiffMax)) { dwWinNewTimeAdjustment = g_dwWinTimeAdjustment - dwDiffMax; dwDiffNew = dwDiffMax; } } VBoxServiceVerbose(3, "VBoxServiceTimeSyncAdjust: Drift=%lldms\n", RTTimeSpecGetMilli(pDrift)); VBoxServiceVerbose(3, "VBoxServiceTimeSyncAdjust: OrgTA=%ld, CurTA=%ld, NewTA=%ld, DiffNew=%ld, DiffMax=%ld\n", g_dwWinTimeAdjustment, dwWinTimeAdjustment, dwWinNewTimeAdjustment, dwDiffNew, dwDiffMax); if (SetSystemTimeAdjustment(dwWinNewTimeAdjustment, FALSE /* Periodic adjustments enabled. */)) { g_cTimeSyncErrors = 0; return true; } if (g_cTimeSyncErrors++ < 10) VBoxServiceError("VBoxServiceTimeSyncAdjust: SetSystemTimeAdjustment failed, error=%u\n", GetLastError()); } else if (g_cTimeSyncErrors++ < 10) VBoxServiceError("VBoxServiceTimeSyncAdjust: GetSystemTimeAdjustment failed, error=%ld\n", GetLastError()); #elif defined(RT_OS_OS2) || defined(RT_OS_HAIKU) /* No API for doing gradual time adjustments. */ #else /* PORTME */ /* * Try use adjtime(), most unix-like systems have this. */ struct timeval tv; RTTimeSpecGetTimeval(pDrift, &tv); if (adjtime(&tv, NULL) == 0) { if (g_cVerbosity >= 1) VBoxServiceVerbose(1, "VBoxServiceTimeSyncAdjust: adjtime by %RDtimespec\n", pDrift); g_cTimeSyncErrors = 0; return true; } #endif /* failed */ return false; } /** * Cancels any pending time adjustment. * * Called when we've caught up and before calls to VBoxServiceTimeSyncSet. */ static void VBoxServiceTimeSyncCancelAdjust(void) { #ifdef RT_OS_WINDOWS /** @todo r=bird: g_hTokenProcess cannot be NULL here. See argumentation in * VBoxServiceTimeSyncAdjust. */ if (g_hTokenProcess == NULL) /* No process token (anymore)? */ return; if (SetSystemTimeAdjustment(0, TRUE /* Periodic adjustments disabled. */)) VBoxServiceVerbose(3, "VBoxServiceTimeSyncCancelAdjust: Windows Time Adjustment is now disabled.\n"); else if (g_cTimeSyncErrors++ < 10) VBoxServiceError("VBoxServiceTimeSyncCancelAdjust: SetSystemTimeAdjustment(,disable) failed, error=%u\n", GetLastError()); #endif /* !RT_OS_WINDOWS */ } /** * Try adjust the time using adjtime or similar. * * @returns true on success, false on failure. * * @param pDrift The time adjustment. */ static void VBoxServiceTimeSyncSet(PCRTTIMESPEC pDrift) { /* * Query the current time, adjust it by adding the drift and set it. */ RTTIMESPEC NewGuestTime; int rc = RTTimeSet(RTTimeSpecAdd(RTTimeNow(&NewGuestTime), pDrift)); if (RT_SUCCESS(rc)) { /* Succeeded - reset the error count and log the change. */ g_cTimeSyncErrors = 0; if (g_cVerbosity >= 1) { char sz[64]; RTTIME Time; VBoxServiceVerbose(1, "time set to %s\n", RTTimeToString(RTTimeExplode(&Time, &NewGuestTime), sz, sizeof(sz))); #ifdef DEBUG RTTIMESPEC Tmp; if (g_cVerbosity >= 3) VBoxServiceVerbose(3, " now %s\n", RTTimeToString(RTTimeExplode(&Time, RTTimeNow(&Tmp)), sz, sizeof(sz))); #endif } } else if (g_cTimeSyncErrors++ < 10) VBoxServiceError("VBoxServiceTimeSyncSet: RTTimeSet(%RDtimespec) failed: %Rrc\n", &NewGuestTime, rc); } /** @copydoc VBOXSERVICE::pfnWorker */ DECLCALLBACK(int) VBoxServiceTimeSyncWorker(bool volatile *pfShutdown) { RTTIME Time; char sz[64]; int rc = VINF_SUCCESS; /* * Tell the control thread that it can continue spawning services. */ RTThreadUserSignal(RTThreadSelf()); /* * The Work Loop. */ for (;;) { /* * Try get a reliable time reading. */ int cTries = 3; do { /* query it. */ RTTIMESPEC GuestNow0, GuestNow, HostNow; RTTimeNow(&GuestNow0); int rc2 = VbglR3GetHostTime(&HostNow); if (RT_FAILURE(rc2)) { if (g_cTimeSyncErrors++ < 10) VBoxServiceError("VBoxServiceTimeSyncWorker: VbglR3GetHostTime failed; rc2=%Rrc\n", rc2); break; } RTTimeNow(&GuestNow); /* calc latency and check if it's ok. */ RTTIMESPEC GuestElapsed = GuestNow; RTTimeSpecSub(&GuestElapsed, &GuestNow0); if ((uint32_t)RTTimeSpecGetMilli(&GuestElapsed) < g_TimeSyncMaxLatency) { /* * Set the time once after we were restored. * (Of course only if the drift is bigger than MinAdjust) */ uint32_t TimeSyncSetThreshold = g_TimeSyncSetThreshold; if (g_fTimeSyncSetOnRestore) { uint64_t idNewSession = g_idTimeSyncSession; VbglR3GetSessionId(&idNewSession); if (idNewSession != g_idTimeSyncSession) { VBoxServiceVerbose(3, "VBoxServiceTimeSyncWorker: The VM session ID changed, forcing resync.\n"); TimeSyncSetThreshold = 0; g_idTimeSyncSession = idNewSession; } } /* * Calculate the adjustment threshold and the current drift. */ uint32_t MinAdjust = RTTimeSpecGetMilli(&GuestElapsed) * g_TimeSyncLatencyFactor; if (MinAdjust < g_TimeSyncMinAdjust) MinAdjust = g_TimeSyncMinAdjust; RTTIMESPEC Drift = HostNow; RTTimeSpecSub(&Drift, &GuestNow); if (RTTimeSpecGetMilli(&Drift) < 0) MinAdjust += g_TimeSyncMinAdjust; /* extra buffer against moving time backwards. */ RTTIMESPEC AbsDrift = Drift; RTTimeSpecAbsolute(&AbsDrift); if (g_cVerbosity >= 3) { VBoxServiceVerbose(3, "VBoxServiceTimeSyncWorker: Host: %s (MinAdjust: %RU32 ms)\n", RTTimeToString(RTTimeExplode(&Time, &HostNow), sz, sizeof(sz)), MinAdjust); VBoxServiceVerbose(3, "VBoxServiceTimeSyncWorker: Guest: - %s => %RDtimespec drift\n", RTTimeToString(RTTimeExplode(&Time, &GuestNow), sz, sizeof(sz)), &Drift); } uint32_t AbsDriftMilli = RTTimeSpecGetMilli(&AbsDrift); if (AbsDriftMilli > MinAdjust) { /* * Ok, the drift is above the threshold. * * Try a gradual adjustment first, if that fails or the drift is * too big, fall back on just setting the time. */ if ( AbsDriftMilli > TimeSyncSetThreshold || g_fTimeSyncSetNext || !VBoxServiceTimeSyncAdjust(&Drift)) { VBoxServiceTimeSyncCancelAdjust(); VBoxServiceTimeSyncSet(&Drift); } } else VBoxServiceTimeSyncCancelAdjust(); break; } VBoxServiceVerbose(3, "VBoxServiceTimeSyncWorker: %RDtimespec: latency too high (%RDtimespec) sleeping 1s\n", GuestElapsed); RTThreadSleep(1000); } while (--cTries > 0); /* Clear the set-next/set-start flag. */ g_fTimeSyncSetNext = false; /* * Block for a while. * * The event semaphore takes care of ignoring interruptions and it * allows us to implement service wakeup later. */ if (*pfShutdown) break; int rc2 = RTSemEventMultiWait(g_TimeSyncEvent, g_TimeSyncInterval); if (*pfShutdown) break; if (rc2 != VERR_TIMEOUT && RT_FAILURE(rc2)) { VBoxServiceError("VBoxServiceTimeSyncWorker: RTSemEventMultiWait failed; rc2=%Rrc\n", rc2); rc = rc2; break; } } VBoxServiceTimeSyncCancelAdjust(); RTSemEventMultiDestroy(g_TimeSyncEvent); g_TimeSyncEvent = NIL_RTSEMEVENTMULTI; return rc; } /** @copydoc VBOXSERVICE::pfnStop */ static DECLCALLBACK(void) VBoxServiceTimeSyncStop(void) { RTSemEventMultiSignal(g_TimeSyncEvent); } /** @copydoc VBOXSERVICE::pfnTerm */ static DECLCALLBACK(void) VBoxServiceTimeSyncTerm(void) { #ifdef RT_OS_WINDOWS /* * Restore the SE_SYSTEMTIME_NAME token privileges (if init succeeded). */ if (g_hTokenProcess) { if (!AdjustTokenPrivileges(g_hTokenProcess, FALSE, &g_TkOldPrivileges, sizeof(TOKEN_PRIVILEGES), NULL, NULL)) { DWORD dwErr = GetLastError(); VBoxServiceError("VBoxServiceTimeSyncTerm: Restoring token privileges (SE_SYSTEMTIME_NAME) failed with code %u!\n", dwErr); } CloseHandle(g_hTokenProcess); g_hTokenProcess = NULL; } #endif /* !RT_OS_WINDOWS */ if (g_TimeSyncEvent != NIL_RTSEMEVENTMULTI) { RTSemEventMultiDestroy(g_TimeSyncEvent); g_TimeSyncEvent = NIL_RTSEMEVENTMULTI; } } /** * The 'timesync' service description. */ VBOXSERVICE g_TimeSync = { /* pszName. */ "timesync", /* pszDescription. */ "Time synchronization", /* pszUsage. */ " [--timesync-interval ] [--timesync-min-adjust ]\n" " [--timesync-latency-factor ] [--timesync-max-latency ]\n" " [--timesync-set-threshold ] [--timesync-set-start]\n" " [--timesync-set-on-restore 0|1]" , /* pszOptions. */ " --timesync-interval Specifies the interval at which to synchronize the\n" " time with the host. The default is 10000 ms.\n" " --timesync-min-adjust The minimum absolute drift value measured in\n" " milliseconds to make adjustments for.\n" " The default is 1000 ms on OS/2 and 100 ms elsewhere.\n" " --timesync-latency-factor\n" " The factor to multiply the time query latency with\n" " to calculate the dynamic minimum adjust time.\n" " The default is 8 times.\n" " --timesync-max-latency The max host timer query latency to accept.\n" " The default is 250 ms.\n" " --timesync-set-threshold\n" " The absolute drift threshold, given as milliseconds,\n" " where to start setting the time instead of trying to\n" " adjust it. The default is 20 min.\n" " --timesync-set-start Set the time when starting the time sync service.\n" " --timesync-set-on-restore 0|1\n" " Immediately set the time when the VM was restored.\n" " 1 = set (default), 0 = don't set.\n" , /* methods */ VBoxServiceTimeSyncPreInit, VBoxServiceTimeSyncOption, VBoxServiceTimeSyncInit, VBoxServiceTimeSyncWorker, VBoxServiceTimeSyncStop, VBoxServiceTimeSyncTerm };