| 1 | /* $Id: VirtualBoxClientImpl.cpp 52442 2014-08-21 16:03:15Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox COM class implementation
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2010-2014 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | #include "VirtualBoxClientImpl.h"
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| 19 |
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| 20 | #include "AutoCaller.h"
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| 21 | #include "VBoxEvents.h"
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| 22 | #include "Logging.h"
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| 23 | #include "VBox/com/ErrorInfo.h"
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| 24 |
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| 25 | #include <iprt/asm.h>
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| 26 | #include <iprt/thread.h>
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| 27 | #include <iprt/critsect.h>
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| 28 | #include <iprt/semaphore.h>
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| 29 | #include <iprt/cpp/utils.h>
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| 30 |
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| 31 |
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| 32 | /** Waiting time between probing whether VBoxSVC is alive. */
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| 33 | #define VBOXCLIENT_DEFAULT_INTERVAL 30000
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| 34 |
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| 35 |
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| 36 | /** Initialize instance counter class variable */
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| 37 | uint32_t VirtualBoxClient::g_cInstances = 0;
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| 38 |
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| 39 |
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| 40 | // constructor / destructor
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| 41 | /////////////////////////////////////////////////////////////////////////////
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| 42 |
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| 43 | HRESULT VirtualBoxClient::FinalConstruct()
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| 44 | {
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| 45 | HRESULT rc = init();
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| 46 | BaseFinalConstruct();
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| 47 | return rc;
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| 48 | }
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| 49 |
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| 50 | void VirtualBoxClient::FinalRelease()
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| 51 | {
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| 52 | uninit();
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| 53 | BaseFinalRelease();
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| 54 | }
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| 55 |
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| 56 | // public initializer/uninitializer for internal purposes only
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| 57 | /////////////////////////////////////////////////////////////////////////////
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| 58 |
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| 59 | /**
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| 60 | * Initializes the VirtualBoxClient object.
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| 61 | *
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| 62 | * @returns COM result indicator
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| 63 | */
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| 64 | HRESULT VirtualBoxClient::init()
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| 65 | {
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| 66 | LogFlowThisFunc(("\n"));
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| 67 |
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| 68 | HRESULT rc;
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| 69 | /* Enclose the state transition NotReady->InInit->Ready */
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| 70 | AutoInitSpan autoInitSpan(this);
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| 71 | AssertReturn(autoInitSpan.isOk(), E_FAIL);
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| 72 |
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| 73 | mData.m_ThreadWatcher = NIL_RTTHREAD;
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| 74 | mData.m_SemEvWatcher = NIL_RTSEMEVENT;
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| 75 |
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| 76 | if (ASMAtomicIncU32(&g_cInstances) != 1)
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| 77 | AssertFailedReturn(E_FAIL);
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| 78 |
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| 79 | rc = mData.m_pVirtualBox.createLocalObject(CLSID_VirtualBox);
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| 80 | AssertComRCReturnRC(rc);
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| 81 |
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| 82 | rc = unconst(mData.m_pEventSource).createObject();
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| 83 | AssertComRCReturnRC(rc);
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| 84 | rc = mData.m_pEventSource->init();
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| 85 | AssertComRCReturnRC(rc);
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| 86 |
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| 87 | /* Setting up the VBoxSVC watcher thread. If anything goes wrong here it
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| 88 | * is not considered important enough to cause any sort of visible
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| 89 | * failure. The monitoring will not be done, but that's all. */
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| 90 | int vrc = RTSemEventCreate(&mData.m_SemEvWatcher);
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| 91 | AssertRC(vrc);
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| 92 | if (RT_SUCCESS(vrc))
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| 93 | {
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| 94 | vrc = RTThreadCreate(&mData.m_ThreadWatcher, SVCWatcherThread,
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| 95 | this, 0, RTTHREADTYPE_INFREQUENT_POLLER,
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| 96 | RTTHREADFLAGS_WAITABLE, "VBoxSVCWatcher");
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| 97 | AssertRC(vrc);
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| 98 | }
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| 99 | else
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| 100 | {
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| 101 | RTSemEventDestroy(mData.m_SemEvWatcher);
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| 102 | mData.m_SemEvWatcher = NIL_RTSEMEVENT;
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| 103 | }
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| 104 |
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| 105 | /* Confirm a successful initialization */
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| 106 | autoInitSpan.setSucceeded();
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| 107 |
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| 108 | return rc;
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| 109 | }
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| 110 |
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| 111 | /**
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| 112 | * Uninitializes the instance and sets the ready flag to FALSE.
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| 113 | * Called either from FinalRelease() or by the parent when it gets destroyed.
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| 114 | */
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| 115 | void VirtualBoxClient::uninit()
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| 116 | {
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| 117 | LogFlowThisFunc(("\n"));
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| 118 |
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| 119 | /* Enclose the state transition Ready->InUninit->NotReady */
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| 120 | AutoUninitSpan autoUninitSpan(this);
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| 121 | if (autoUninitSpan.uninitDone())
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| 122 | return;
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| 123 |
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| 124 | if (mData.m_ThreadWatcher != NIL_RTTHREAD)
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| 125 | {
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| 126 | /* Signal the event semaphore and wait for the thread to terminate.
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| 127 | * if it hangs for some reason exit anyway, this can cause a crash
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| 128 | * though as the object will no longer be available. */
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| 129 | RTSemEventSignal(mData.m_SemEvWatcher);
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| 130 | RTThreadWait(mData.m_ThreadWatcher, 30000, NULL);
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| 131 | mData.m_ThreadWatcher = NIL_RTTHREAD;
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| 132 | RTSemEventDestroy(mData.m_SemEvWatcher);
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| 133 | mData.m_SemEvWatcher = NIL_RTSEMEVENT;
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| 134 | }
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| 135 |
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| 136 | mData.m_pVirtualBox.setNull();
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| 137 |
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| 138 | ASMAtomicDecU32(&g_cInstances);
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| 139 | }
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| 140 |
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| 141 | // IVirtualBoxClient properties
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| 142 | /////////////////////////////////////////////////////////////////////////////
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| 143 |
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| 144 | /**
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| 145 | * Returns a reference to the VirtualBox object.
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| 146 | *
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| 147 | * @returns COM status code
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| 148 | * @param aVirtualBox Address of result variable.
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| 149 | */
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| 150 | HRESULT VirtualBoxClient::getVirtualBox(ComPtr<IVirtualBox> &aVirtualBox)
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| 151 | {
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| 152 | AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
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| 153 | aVirtualBox = mData.m_pVirtualBox;
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| 154 | return S_OK;
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| 155 | }
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| 156 |
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| 157 | /**
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| 158 | * Create a new Session object and return a reference to it.
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| 159 | *
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| 160 | * @returns COM status code
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| 161 | * @param aSession Address of result variable.
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| 162 | */
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| 163 | HRESULT VirtualBoxClient::getSession(ComPtr<ISession> &aSession)
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| 164 | {
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| 165 | /* this is not stored in this object, no need to lock */
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| 166 | ComPtr<ISession> pSession;
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| 167 | HRESULT rc = pSession.createInprocObject(CLSID_Session);
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| 168 | if (SUCCEEDED(rc))
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| 169 | aSession = pSession;
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| 170 | return rc;
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| 171 | }
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| 172 |
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| 173 | /**
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| 174 | * Return reference to the EventSource associated with this object.
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| 175 | *
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| 176 | * @returns COM status code
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| 177 | * @param aEventSource Address of result variable.
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| 178 | */
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| 179 | HRESULT VirtualBoxClient::getEventSource(ComPtr<IEventSource> &aEventSource)
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| 180 | {
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| 181 | /* this is const, no need to lock */
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| 182 | aEventSource = mData.m_pEventSource;
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| 183 | return aEventSource.isNull() ? E_FAIL : S_OK;
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| 184 | }
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| 185 |
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| 186 | // IVirtualBoxClient methods
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| 187 | /////////////////////////////////////////////////////////////////////////////
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| 188 |
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| 189 | /**
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| 190 | * Checks a Machine object for any pending errors.
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| 191 | *
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| 192 | * @returns COM status code
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| 193 | * @param aMachine Machine object to check.
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| 194 | */
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| 195 | HRESULT VirtualBoxClient::checkMachineError(const ComPtr<IMachine> &aMachine)
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| 196 | {
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| 197 | BOOL fAccessible = FALSE;
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| 198 | HRESULT rc = aMachine->COMGETTER(Accessible)(&fAccessible);
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| 199 | if (FAILED(rc))
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| 200 | return setError(rc, tr("Could not check the accessibility status of the VM"));
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| 201 | else if (!fAccessible)
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| 202 | {
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| 203 | ComPtr<IVirtualBoxErrorInfo> pAccessError;
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| 204 | rc = aMachine->COMGETTER(AccessError)(pAccessError.asOutParam());
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| 205 | if (FAILED(rc))
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| 206 | return setError(rc, tr("Could not get the access error message of the VM"));
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| 207 | else
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| 208 | {
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| 209 | ErrorInfo info(pAccessError);
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| 210 | ErrorInfoKeeper eik(info);
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| 211 | return info.getResultCode();
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| 212 | }
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| 213 | }
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| 214 | return S_OK;
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| 215 | }
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| 216 |
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| 217 | // private methods
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| 218 | /////////////////////////////////////////////////////////////////////////////
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| 219 |
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| 220 | /*static*/
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| 221 | DECLCALLBACK(int) VirtualBoxClient::SVCWatcherThread(RTTHREAD ThreadSelf,
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| 222 | void *pvUser)
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| 223 | {
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| 224 | NOREF(ThreadSelf);
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| 225 | Assert(pvUser);
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| 226 | VirtualBoxClient *pThis = (VirtualBoxClient *)pvUser;
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| 227 | RTSEMEVENT sem = pThis->mData.m_SemEvWatcher;
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| 228 | RTMSINTERVAL cMillies = VBOXCLIENT_DEFAULT_INTERVAL;
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| 229 | int vrc;
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| 230 |
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| 231 | /* The likelihood of early crashes are high, so start with a short wait. */
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| 232 | vrc = RTSemEventWait(sem, cMillies / 2);
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| 233 |
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| 234 | /* As long as the waiting times out keep retrying the wait. */
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| 235 | while (RT_FAILURE(vrc))
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| 236 | {
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| 237 | {
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| 238 | HRESULT rc = S_OK;
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| 239 | ComPtr<IVirtualBox> pV;
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| 240 | {
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| 241 | AutoReadLock alock(pThis COMMA_LOCKVAL_SRC_POS);
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| 242 | pV = pThis->mData.m_pVirtualBox;
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| 243 | }
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| 244 | if (!pV.isNull())
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| 245 | {
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| 246 | ULONG rev;
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| 247 | rc = pV->COMGETTER(Revision)(&rev);
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| 248 | if (FAILED_DEAD_INTERFACE(rc))
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| 249 | {
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| 250 | LogRel(("VirtualBoxClient: detected unresponsive VBoxSVC (rc=%Rhrc)\n", rc));
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| 251 | {
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| 252 | AutoWriteLock alock(pThis COMMA_LOCKVAL_SRC_POS);
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| 253 | /* Throw away the VirtualBox reference, it's no longer
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| 254 | * usable as VBoxSVC terminated in the mean time. */
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| 255 | pThis->mData.m_pVirtualBox.setNull();
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| 256 | }
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| 257 | fireVBoxSVCAvailabilityChangedEvent(pThis->mData.m_pEventSource, FALSE);
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| 258 | }
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| 259 | }
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| 260 | else
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| 261 | {
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| 262 | /* Try to get a new VirtualBox reference straight away, and if
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| 263 | * this fails use an increased waiting time as very frequent
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| 264 | * restart attempts in some wedged config can cause high CPU
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| 265 | * and disk load. */
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| 266 | ComPtr<IVirtualBox> pVirtualBox;
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| 267 | rc = pVirtualBox.createLocalObject(CLSID_VirtualBox);
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| 268 | if (FAILED(rc))
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| 269 | cMillies = 3 * VBOXCLIENT_DEFAULT_INTERVAL;
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| 270 | else
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| 271 | {
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| 272 | LogRel(("VirtualBoxClient: detected working VBoxSVC (rc=%Rhrc)\n", rc));
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| 273 | {
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| 274 | AutoWriteLock alock(pThis COMMA_LOCKVAL_SRC_POS);
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| 275 | /* Update the VirtualBox reference, there's a working
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| 276 | * VBoxSVC again from now on. */
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| 277 | pThis->mData.m_pVirtualBox = pVirtualBox;
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| 278 | }
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| 279 | fireVBoxSVCAvailabilityChangedEvent(pThis->mData.m_pEventSource, TRUE);
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| 280 | cMillies = VBOXCLIENT_DEFAULT_INTERVAL;
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| 281 | }
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| 282 | }
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| 283 | }
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| 284 | vrc = RTSemEventWait(sem, cMillies);
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| 285 | }
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| 286 | return 0;
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| 287 | }
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| 288 |
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| 289 | /* vi: set tabstop=4 shiftwidth=4 expandtab: */
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