VBoxServiceControl.cpp@ 85800

Last change on this file since 85800 was 84548, checked in by vboxsync, 5 years ago
Guest Control: Implemented guest side support for gracefully rebooting / shutting down the guest. Untested. bugref:9320
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1	/* $Id: VBoxServiceControl.cpp 84548 2020-05-26 17:43:31Z vboxsync $ */
2	/** @file
3	* VBoxServiceControl - Host-driven Guest Control.
4	*/
5
6	/*
7	* Copyright (C) 2012-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/** @page pg_vgsvc_gstctrl VBoxService - Guest Control
19	*
20	* The Guest Control subservice helps implementing the IGuest APIs.
21	*
22	* The communication between this service (and its children) and IGuest goes
23	* over the HGCM GuestControl service.
24	*
25	* The IGuest APIs provides means to manipulate (control) files, directories,
26	* symbolic links and processes within the guest. Most of these means requires
27	* credentials of a guest OS user to operate, though some restricted ones
28	* operates directly as the VBoxService user (root / system service account).
29	*
30	* The current design is that a subprocess is spawned for handling operations as
31	* a given user. This process is represented as IGuestSession in the API. The
32	* subprocess will be spawned as the given use, giving up the privileges the
33	* parent subservice had.
34	*
35	* It will try handle as many of the operations directly from within the
36	* subprocess, but for more complicated things (or things that haven't yet been
37	* converted), it will spawn a helper process that does the actual work.
38	*
39	* These helpers are the typically modeled on similar unix core utilities, like
40	* mkdir, rm, rmdir, cat and so on. The helper tools can also be launched
41	* directly from VBoxManage by the user by prepending the 'vbox_' prefix to the
42	* unix command.
43	*
44	*/
45
46
47	/*********************************************************************************************************************************
48	* Header Files *
49	*********************************************************************************************************************************/
50	#include <iprt/asm.h>
51	#include <iprt/assert.h>
52	#include <iprt/env.h>
53	#include <iprt/file.h>
54	#include <iprt/getopt.h>
55	#include <iprt/mem.h>
56	#include <iprt/path.h>
57	#include <iprt/process.h>
58	#include <iprt/semaphore.h>
59	#include <iprt/thread.h>
60	#include <VBox/err.h>
61	#include <VBox/VBoxGuestLib.h>
62	#include <VBox/HostServices/GuestControlSvc.h>
63	#include "VBoxServiceInternal.h"
64	#include "VBoxServiceControl.h"
65	#include "VBoxServiceUtils.h"
66
67	using namespace guestControl;
68
69
70	/*********************************************************************************************************************************
71	* Global Variables *
72	*********************************************************************************************************************************/
73	/** The control interval (milliseconds). */
74	static uint32_t g_msControlInterval = 0;
75	/** The semaphore we're blocking our main control thread on. */
76	static RTSEMEVENTMULTI g_hControlEvent = NIL_RTSEMEVENTMULTI;
77	/** The VM session ID. Changes whenever the VM is restored or reset. */
78	static uint64_t g_idControlSession;
79	/** The guest control service client ID. */
80	uint32_t g_idControlSvcClient = 0;
81	/** VBOX_GUESTCTRL_HF_XXX */
82	uint64_t g_fControlHostFeatures0 = 0;
83	#if 0 /** @todo process limit */
84	/** How many started guest processes are kept into memory for supplying
85	* information to the host. Default is 256 processes. If 0 is specified,
86	* the maximum number of processes is unlimited. */
87	static uint32_t g_uControlProcsMaxKept = 256;
88	#endif
89	/** List of guest control session threads (VBOXSERVICECTRLSESSIONTHREAD).
90	* A guest session thread represents a forked guest session process
91	* of VBoxService. */
92	RTLISTANCHOR g_lstControlSessionThreads;
93	/** The local session object used for handling all session-related stuff.
94	* When using the legacy guest control protocol (< 2), this session runs
95	* under behalf of the VBoxService main process. On newer protocol versions
96	* each session is a forked version of VBoxService using the appropriate
97	* user credentials for opening a guest session. These forked sessions then
98	* are kept in VBOXSERVICECTRLSESSIONTHREAD structures. */
99	VBOXSERVICECTRLSESSION g_Session;
100	/** Copy of VbglR3GuestCtrlSupportsOptimizations().*/
101	bool g_fControlSupportsOptimizations = true;
102
103
104	/*********************************************************************************************************************************
105	* Internal Functions *
106	*********************************************************************************************************************************/
107	static int vgsvcGstCtrlHandleSessionOpen(PVBGLR3GUESTCTRLCMDCTX pHostCtx);
108	static int vgsvcGstCtrlHandleSessionClose(PVBGLR3GUESTCTRLCMDCTX pHostCtx);
109	static int vgsvcGstCtrlInvalidate(void);
110	static void vgsvcGstCtrlShutdown(void);
111
112
113	/**
114	* @interface_method_impl{VBOXSERVICE,pfnPreInit}
115	*/
116	static DECLCALLBACK(int) vgsvcGstCtrlPreInit(void)
117	{
118	int rc;
119	#ifdef VBOX_WITH_GUEST_PROPS
120	/*
121	* Read the service options from the VM's guest properties.
122	* Note that these options can be overridden by the command line options later.
123	*/
124	uint32_t uGuestPropSvcClientID;
125	rc = VbglR3GuestPropConnect(&uGuestPropSvcClientID);
126	if (RT_FAILURE(rc))
127	{
128	if (rc == VERR_HGCM_SERVICE_NOT_FOUND) /* Host service is not available. */
129	{
130	VGSvcVerbose(0, "Guest property service is not available, skipping\n");
131	rc = VINF_SUCCESS;
132	}
133	else
134	VGSvcError("Failed to connect to the guest property service, rc=%Rrc\n", rc);
135	}
136	else
137	VbglR3GuestPropDisconnect(uGuestPropSvcClientID);
138
139	if (rc == VERR_NOT_FOUND) /* If a value is not found, don't be sad! */
140	rc = VINF_SUCCESS;
141	#else
142	/* Nothing to do here yet. */
143	rc = VINF_SUCCESS;
144	#endif
145
146	if (RT_SUCCESS(rc))
147	{
148	/* Init session object. */
149	rc = VGSvcGstCtrlSessionInit(&g_Session, 0 /* Flags */);
150	}
151
152	return rc;
153	}
154
155
156	/**
157	* @interface_method_impl{VBOXSERVICE,pfnOption}
158	*/
159	static DECLCALLBACK(int) vgsvcGstCtrlOption(const char ppszShort, int argc, char argv, int *pi)
160	{
161	int rc = -1;
162	if (ppszShort)
163	/* no short options */;
164	else if (!strcmp(argv[*pi], "--control-interval"))
165	rc = VGSvcArgUInt32(argc, argv, "", pi,
166	&g_msControlInterval, 1, UINT32_MAX - 1);
167	#ifdef DEBUG
168	else if (!strcmp(argv[*pi], "--control-dump-stdout"))
169	{
170	g_Session.fFlags \|= VBOXSERVICECTRLSESSION_FLAG_DUMPSTDOUT;
171	rc = 0; /* Flag this command as parsed. */
172	}
173	else if (!strcmp(argv[*pi], "--control-dump-stderr"))
174	{
175	g_Session.fFlags \|= VBOXSERVICECTRLSESSION_FLAG_DUMPSTDERR;
176	rc = 0; /* Flag this command as parsed. */
177	}
178	#endif
179	return rc;
180	}
181
182
183	/**
184	* @interface_method_impl{VBOXSERVICE,pfnInit}
185	*/
186	static DECLCALLBACK(int) vgsvcGstCtrlInit(void)
187	{
188	/*
189	* If not specified, find the right interval default.
190	* Then create the event sem to block on.
191	*/
192	if (!g_msControlInterval)
193	g_msControlInterval = 1000;
194
195	int rc = RTSemEventMultiCreate(&g_hControlEvent);
196	AssertRCReturn(rc, rc);
197
198	VbglR3GetSessionId(&g_idControlSession); /* The status code is ignored as this information is not available with VBox < 3.2.10. */
199
200	RTListInit(&g_lstControlSessionThreads);
201
202	/*
203	* Try connect to the host service and tell it we want to be master (if supported).
204	*/
205	rc = VbglR3GuestCtrlConnect(&g_idControlSvcClient);
206	if (RT_SUCCESS(rc))
207	{
208	rc = vgsvcGstCtrlInvalidate();
209	if (RT_SUCCESS(rc))
210	return rc;
211	}
212	else
213	{
214	/* If the service was not found, we disable this service without
215	causing VBoxService to fail. */
216	if (rc == VERR_HGCM_SERVICE_NOT_FOUND) /* Host service is not available. */
217	{
218	VGSvcVerbose(0, "Guest control service is not available\n");
219	rc = VERR_SERVICE_DISABLED;
220	}
221	else
222	VGSvcError("Failed to connect to the guest control service! Error: %Rrc\n", rc);
223	}
224	RTSemEventMultiDestroy(g_hControlEvent);
225	g_hControlEvent = NIL_RTSEMEVENTMULTI;
226	g_idControlSvcClient = 0;
227	return rc;
228	}
229
230	static int vgsvcGstCtrlInvalidate(void)
231	{
232	VGSvcVerbose(1, "Invalidating configuration ...\n");
233
234	int rc = VINF_SUCCESS;
235
236	g_fControlSupportsOptimizations = VbglR3GuestCtrlSupportsOptimizations(g_idControlSvcClient);
237	if (g_fControlSupportsOptimizations)
238	rc = VbglR3GuestCtrlMakeMeMaster(g_idControlSvcClient);
239	if (RT_SUCCESS(rc))
240	{
241	VGSvcVerbose(3, "Guest control service client ID=%RU32%s\n",
242	g_idControlSvcClient, g_fControlSupportsOptimizations ? " w/ optimizations" : "");
243
244	/*
245	* Report features to the host.
246	*/
247	const uint64_t fGuestFeatures = VBOX_GUESTCTRL_GF_0_SET_SIZE
248	\| VBOX_GUESTCTRL_GF_0_PROCESS_ARGV0
249	\| VBOX_GUESTCTRL_GF_0_PROCESS_DYNAMIC_SIZES
250	\| VBOX_GUESTCTRL_GF_0_SHUTDOWN;
251
252	rc = VbglR3GuestCtrlReportFeatures(g_idControlSvcClient, fGuestFeatures, &g_fControlHostFeatures0);
253	if (RT_SUCCESS(rc))
254	VGSvcVerbose(3, "Host features: %#RX64\n", g_fControlHostFeatures0);
255	else
256	VGSvcVerbose(1, "Warning! Feature reporing failed: %Rrc\n", rc);
257
258	return VINF_SUCCESS;
259	}
260	VGSvcError("Failed to become guest control master: %Rrc\n", rc);
261	VbglR3GuestCtrlDisconnect(g_idControlSvcClient);
262
263	return rc;
264	}
265
266	/**
267	* @interface_method_impl{VBOXSERVICE,pfnWorker}
268	*/
269	static DECLCALLBACK(int) vgsvcGstCtrlWorker(bool volatile *pfShutdown)
270	{
271	/*
272	* Tell the control thread that it can continue spawning services.
273	*/
274	RTThreadUserSignal(RTThreadSelf());
275	Assert(g_idControlSvcClient > 0);
276
277	/* Allocate a scratch buffer for messages which also send
278	* payload data with them. */
279	uint32_t cbScratchBuf = _64K; /** @todo Make buffer size configurable via guest properties/argv! */
280	AssertReturn(RT_IS_POWER_OF_TWO(cbScratchBuf), VERR_INVALID_PARAMETER);
281	uint8_t pvScratchBuf = (uint8_t)RTMemAlloc(cbScratchBuf);
282	AssertReturn(pvScratchBuf, VERR_NO_MEMORY);
283
284	int rc = VINF_SUCCESS; /* (shut up compiler warnings) */
285	int cRetrievalFailed = 0; /* Number of failed message retrievals in a row. */
286	while (!*pfShutdown)
287	{
288	VGSvcVerbose(3, "GstCtrl: Waiting for host msg ...\n");
289	VBGLR3GUESTCTRLCMDCTX ctxHost = { g_idControlSvcClient, 0 /idContext/, 2 /uProtocol/, 0 /cParms/ };
290	uint32_t idMsg = 0;
291	rc = VbglR3GuestCtrlMsgPeekWait(g_idControlSvcClient, &idMsg, &ctxHost.uNumParms, &g_idControlSession);
292	if (RT_SUCCESS(rc))
293	{
294	cRetrievalFailed = 0; /* Reset failed retrieval count. */
295	VGSvcVerbose(4, "idMsg=%RU32 (%s) (%RU32 parms) retrieved\n",
296	idMsg, GstCtrlHostMsgtoStr((eHostMsg)idMsg), ctxHost.uNumParms);
297
298	/*
299	* Handle the host message.
300	*/
301	switch (idMsg)
302	{
303	case HOST_MSG_CANCEL_PENDING_WAITS:
304	VGSvcVerbose(1, "We were asked to quit ...\n");
305	break;
306
307	case HOST_MSG_SESSION_CREATE:
308	rc = vgsvcGstCtrlHandleSessionOpen(&ctxHost);
309	break;
310
311	/* This message is also sent to the child session process (by the host). */
312	case HOST_MSG_SESSION_CLOSE:
313	rc = vgsvcGstCtrlHandleSessionClose(&ctxHost);
314	break;
315
316	default:
317	if (VbglR3GuestCtrlSupportsOptimizations(g_idControlSvcClient))
318	{
319	rc = VbglR3GuestCtrlMsgSkip(g_idControlSvcClient, VERR_NOT_SUPPORTED, idMsg);
320	VGSvcVerbose(1, "Skipped unexpected message idMsg=%RU32 (%s), cParms=%RU32 (rc=%Rrc)\n",
321	idMsg, GstCtrlHostMsgtoStr((eHostMsg)idMsg), ctxHost.uNumParms, rc);
322	}
323	else
324	{
325	rc = VbglR3GuestCtrlMsgSkipOld(g_idControlSvcClient);
326	VGSvcVerbose(3, "Skipped idMsg=%RU32, cParms=%RU32, rc=%Rrc\n", idMsg, ctxHost.uNumParms, rc);
327	}
328	break;
329	}
330
331	/* Do we need to shutdown? */
332	if (idMsg == HOST_MSG_CANCEL_PENDING_WAITS)
333	break;
334
335	/* Let's sleep for a bit and let others run ... */
336	RTThreadYield();
337	}
338	/*
339	* Handle restore notification from host. All the context IDs (sessions,
340	* files, proceses, etc) are invalidated by a VM restore and must be closed.
341	*/
342	else if (rc == VERR_VM_RESTORED)
343	{
344	VGSvcVerbose(1, "The VM session ID changed (i.e. restored)\n");
345	int rc2 = VGSvcGstCtrlSessionClose(&g_Session);
346	AssertRC(rc2);
347
348	rc2 = VbglR3GuestCtrlSessionHasChanged(g_idControlSvcClient, g_idControlSession);
349	AssertRC(rc2);
350
351	/* Invalidate the internal state to match the current host we got restored from. */
352	rc2 = vgsvcGstCtrlInvalidate();
353	AssertRC(rc2);
354	}
355	else
356	{
357	/* Note: VERR_GEN_IO_FAILURE seems to be normal if ran into timeout. */
358	/** @todo r=bird: Above comment makes no sense. How can you get a timeout in a blocking HGCM call? */
359	VGSvcError("GstCtrl: Getting host message failed with %Rrc\n", rc);
360
361	/* Check for VM session change. */
362	/** @todo We don't need to check the host here. */
363	uint64_t idNewSession = g_idControlSession;
364	int rc2 = VbglR3GetSessionId(&idNewSession);
365	if ( RT_SUCCESS(rc2)
366	&& (idNewSession != g_idControlSession))
367	{
368	VGSvcVerbose(1, "GstCtrl: The VM session ID changed\n");
369	g_idControlSession = idNewSession;
370
371	/* Close all opened guest sessions -- all context IDs, sessions etc.
372	* are now invalid. */
373	rc2 = VGSvcGstCtrlSessionClose(&g_Session);
374	AssertRC(rc2);
375
376	/* Do a reconnect. */
377	VGSvcVerbose(1, "Reconnecting to HGCM service ...\n");
378	rc2 = VbglR3GuestCtrlConnect(&g_idControlSvcClient);
379	if (RT_SUCCESS(rc2))
380	{
381	VGSvcVerbose(3, "Guest control service client ID=%RU32\n", g_idControlSvcClient);
382	cRetrievalFailed = 0;
383	continue; /* Skip waiting. */
384	}
385	VGSvcError("Unable to re-connect to HGCM service, rc=%Rrc, bailing out\n", rc);
386	break;
387	}
388
389	if (rc == VERR_INTERRUPTED)
390	RTThreadYield(); /* To be on the safe side... */
391	else if (++cRetrievalFailed <= 16) /** @todo Make this configurable? */
392	RTThreadSleep(1000); /* Wait a bit before retrying. */
393	else
394	{
395	VGSvcError("Too many failed attempts in a row to get next message, bailing out\n");
396	break;
397	}
398	}
399	}
400
401	VGSvcVerbose(0, "Guest control service stopped\n");
402
403	/* Delete scratch buffer. */
404	if (pvScratchBuf)
405	RTMemFree(pvScratchBuf);
406
407	VGSvcVerbose(0, "Guest control worker returned with rc=%Rrc\n", rc);
408	return rc;
409	}
410
411
412	static int vgsvcGstCtrlHandleSessionOpen(PVBGLR3GUESTCTRLCMDCTX pHostCtx)
413	{
414	AssertPtrReturn(pHostCtx, VERR_INVALID_POINTER);
415
416	/*
417	* Retrieve the message parameters.
418	*/
419	PVBGLR3GUESTCTRLSESSIONSTARTUPINFO pStartupInfo;
420	int rc = VbglR3GuestCtrlSessionGetOpen(pHostCtx, &pStartupInfo);
421	if (RT_SUCCESS(rc))
422	{
423	/*
424	* Flat out refuse to work with protocol v1 hosts.
425	*/
426	if (pStartupInfo->uProtocol == 2)
427	{
428	pHostCtx->uProtocol = pStartupInfo->uProtocol;
429	VGSvcVerbose(3, "Client ID=%RU32 now is using protocol %RU32\n", pHostCtx->uClientID, pHostCtx->uProtocol);
430
431	/** @todo Someone explain why this code isn't in this file too? v1 support? */
432	rc = VGSvcGstCtrlSessionThreadCreate(&g_lstControlSessionThreads, pStartupInfo, NULL /* ppSessionThread */);
433	/* Report failures to the host (successes are taken care of by the session thread). */
434	}
435	else
436	{
437	VGSvcError("The host wants to use protocol v%u, we only support v2!\n", pStartupInfo->uProtocol);
438	rc = VERR_VERSION_MISMATCH;
439	}
440	if (RT_FAILURE(rc))
441	{
442	int rc2 = VbglR3GuestCtrlSessionNotify(pHostCtx, GUEST_SESSION_NOTIFYTYPE_ERROR, rc);
443	if (RT_FAILURE(rc2))
444	VGSvcError("Reporting session error status on open failed with rc=%Rrc\n", rc2);
445	}
446	}
447	else
448	{
449	VGSvcError("Error fetching parameters for opening guest session: %Rrc\n", rc);
450	VbglR3GuestCtrlMsgSkip(pHostCtx->uClientID, rc, UINT32_MAX);
451	}
452
453	VbglR3GuestCtrlSessionStartupInfoFree(pStartupInfo);
454	pStartupInfo = NULL;
455
456	VGSvcVerbose(3, "Opening a new guest session returned rc=%Rrc\n", rc);
457	return rc;
458	}
459
460
461	static int vgsvcGstCtrlHandleSessionClose(PVBGLR3GUESTCTRLCMDCTX pHostCtx)
462	{
463	AssertPtrReturn(pHostCtx, VERR_INVALID_POINTER);
464
465	uint32_t idSession;
466	uint32_t fFlags;
467	int rc = VbglR3GuestCtrlSessionGetClose(pHostCtx, &fFlags, &idSession);
468	if (RT_SUCCESS(rc))
469	{
470	rc = VERR_NOT_FOUND;
471
472	PVBOXSERVICECTRLSESSIONTHREAD pThread;
473	RTListForEach(&g_lstControlSessionThreads, pThread, VBOXSERVICECTRLSESSIONTHREAD, Node)
474	{
475	if ( pThread->pStartupInfo
476	&& pThread->pStartupInfo->uSessionID == idSession)
477	{
478	rc = VGSvcGstCtrlSessionThreadDestroy(pThread, fFlags);
479	break;
480	}
481	}
482
483	#if 0 /** @todo A bit of a mess here as this message goes to both to this process (master) and the session process. */
484	if (RT_FAILURE(rc))
485	{
486	/* Report back on failure. On success this will be done
487	* by the forked session thread. */
488	int rc2 = VbglR3GuestCtrlSessionNotify(pHostCtx,
489	GUEST_SESSION_NOTIFYTYPE_ERROR, rc);
490	if (RT_FAILURE(rc2))
491	{
492	VGSvcError("Reporting session error status on close failed with rc=%Rrc\n", rc2);
493	if (RT_SUCCESS(rc))
494	rc = rc2;
495	}
496	}
497	#endif
498	VGSvcVerbose(2, "Closing guest session %RU32 returned rc=%Rrc\n", idSession, rc);
499	}
500	else
501	{
502	VGSvcError("Error fetching parameters for closing guest session: %Rrc\n", rc);
503	VbglR3GuestCtrlMsgSkip(pHostCtx->uClientID, rc, UINT32_MAX);
504	}
505	return rc;
506	}
507
508
509	/**
510	* @interface_method_impl{VBOXSERVICE,pfnStop}
511	*/
512	static DECLCALLBACK(void) vgsvcGstCtrlStop(void)
513	{
514	VGSvcVerbose(3, "Stopping ...\n");
515
516	/** @todo Later, figure what to do if we're in RTProcWait(). It's a very
517	* annoying call since doesn't support timeouts in the posix world. */
518	if (g_hControlEvent != NIL_RTSEMEVENTMULTI)
519	RTSemEventMultiSignal(g_hControlEvent);
520
521	/*
522	* Ask the host service to cancel all pending requests for the main
523	* control thread so that we can shutdown properly here.
524	*/
525	if (g_idControlSvcClient)
526	{
527	VGSvcVerbose(3, "Cancelling pending waits (client ID=%u) ...\n",
528	g_idControlSvcClient);
529
530	int rc = VbglR3GuestCtrlCancelPendingWaits(g_idControlSvcClient);
531	if (RT_FAILURE(rc))
532	VGSvcError("Cancelling pending waits failed; rc=%Rrc\n", rc);
533	}
534	}
535
536
537	/**
538	* Destroys all guest process threads which are still active.
539	*/
540	static void vgsvcGstCtrlShutdown(void)
541	{
542	VGSvcVerbose(2, "Shutting down ...\n");
543
544	int rc2 = VGSvcGstCtrlSessionThreadDestroyAll(&g_lstControlSessionThreads, 0 /* Flags */);
545	if (RT_FAILURE(rc2))
546	VGSvcError("Closing session threads failed with rc=%Rrc\n", rc2);
547
548	rc2 = VGSvcGstCtrlSessionClose(&g_Session);
549	if (RT_FAILURE(rc2))
550	VGSvcError("Closing session failed with rc=%Rrc\n", rc2);
551
552	VGSvcVerbose(2, "Shutting down complete\n");
553	}
554
555
556	/**
557	* @interface_method_impl{VBOXSERVICE,pfnTerm}
558	*/
559	static DECLCALLBACK(void) vgsvcGstCtrlTerm(void)
560	{
561	VGSvcVerbose(3, "Terminating ...\n");
562
563	vgsvcGstCtrlShutdown();
564
565	VGSvcVerbose(3, "Disconnecting client ID=%u ...\n", g_idControlSvcClient);
566	VbglR3GuestCtrlDisconnect(g_idControlSvcClient);
567	g_idControlSvcClient = 0;
568
569	if (g_hControlEvent != NIL_RTSEMEVENTMULTI)
570	{
571	RTSemEventMultiDestroy(g_hControlEvent);
572	g_hControlEvent = NIL_RTSEMEVENTMULTI;
573	}
574	}
575
576
577	/**
578	* The 'vminfo' service description.
579	*/
580	VBOXSERVICE g_Control =
581	{
582	/* pszName. */
583	"control",
584	/* pszDescription. */
585	"Host-driven Guest Control",
586	/* pszUsage. */
587	#ifdef DEBUG
588	" [--control-dump-stderr] [--control-dump-stdout]\n"
589	#endif
590	" [--control-interval <ms>]"
591	,
592	/* pszOptions. */
593	#ifdef DEBUG
594	" --control-dump-stderr Dumps all guest proccesses stderr data to the\n"
595	" temporary directory.\n"
596	" --control-dump-stdout Dumps all guest proccesses stdout data to the\n"
597	" temporary directory.\n"
598	#endif
599	" --control-interval Specifies the interval at which to check for\n"
600	" new control messages. The default is 1000 ms.\n"
601	,
602	/* methods */
603	vgsvcGstCtrlPreInit,
604	vgsvcGstCtrlOption,
605	vgsvcGstCtrlInit,
606	vgsvcGstCtrlWorker,
607	vgsvcGstCtrlStop,
608	vgsvcGstCtrlTerm
609	};
610

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source: vbox/trunk/src/VBox/Additions/common/VBoxService/VBoxServiceControl.cpp@ 85800

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