localipc-win.cpp@ 35018

Last change on this file since 35018 was 33540, checked in by vboxsync, 14 years ago
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1	/* $Id: localipc-win.cpp 33540 2010-10-28 09:27:05Z vboxsync $ */
2	/** @file
3	* IPRT - Local IPC, Windows Implementation Using Named Pipes.
4	*/
5
6	/*
7	* Copyright (C) 2008 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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27	/*******************************************************************************
28	* Header Files *
29	*******************************************************************************/
30	/*
31	* We have to force NT 5.0 here because of
32	* ConvertStringSecurityDescriptorToSecurityDescriptor. Note that because of
33	* FILE_FLAG_FIRST_PIPE_INSTANCE this code actually requires W2K SP2+.
34	*/
35	#ifndef _WIN32_WINNT
36	# define _WIN32_WINNT 0x0500 /* for ConvertStringSecurityDescriptorToSecurityDescriptor */
37	#elif _WIN32_WINNT < 0x0500
38	# undef _WIN32_WINNT
39	# define _WIN32_WINNT 0x0500
40	#endif
41	#include <Windows.h>
42	#include <sddl.h>
43
44	#include <iprt/localipc.h>
45	#include <iprt/thread.h>
46	#include <iprt/critsect.h>
47	#include <iprt/alloc.h>
48	#include <iprt/assert.h>
49	#include <iprt/param.h>
50	#include <iprt/err.h>
51	#include <iprt/string.h>
52	#include <iprt/asm.h>
53
54	#include "internal/magics.h"
55
56
57	/*******************************************************************************
58	* Defined Constants And Macros *
59	*******************************************************************************/
60	/** Pipe prefix string. */
61	#define RTLOCALIPC_WIN_PREFIX "\\\\.\\pipe\\IPRT-"
62
63	/** DACL for block all network access and local users other than the creator/owner.
64	*
65	* ACE format: (ace_type;ace_flags;rights;object_guid;inherit_object_guid;account_sid)
66	*
67	* Note! FILE_GENERIC_WRITE (SDDL_FILE_WRITE) is evil here because it includes
68	* the FILE_CREATE_PIPE_INSTANCE(=FILE_APPEND_DATA) flag. Thus the hardcoded
69	* value 0x0012019b in the 2nd ACE. It expands to:
70	* 0x00000001 - FILE_READ_DATA
71	* 0x00000008 - FILE_READ_EA
72	* 0x00000080 - FILE_READ_ATTRIBUTES
73	* 0x00020000 - READ_CONTROL
74	* 0x00100000 - SYNCHRONIZE
75	* 0x00000002 - FILE_WRITE_DATA
76	* 0x00000010 - FILE_WRITE_EA
77	* 0x00000100 - FILE_WRITE_ATTRIBUTES
78	* 0x0012019b
79	* or FILE_GENERIC_READ \| (FILE_GENERIC_WRITE & ~FILE_CREATE_PIPE_INSTANCE)
80	*
81	* @todo Double check this!
82	* @todo Drop the EA rights too? Since they doesn't mean anything to PIPS according to the docs.
83	* @todo EVERYONE -> AUTHENTICATED USERS or something more appropriate?
84	* @todo Have trouble allowing the owner FILE_CREATE_PIPE_INSTANCE access, so for now I'm hacking
85	* it just to get progress - the service runs as local system.
86	* The CREATOR OWNER and PERSONAL SELF works (the former is only involved in inheriting
87	* it seems, which is why it won't work. The latter I've no idea about. Perhaps the solution
88	* is to go the annoying route of OpenProcessToken, QueryTokenInformation,
89	* ConvertSidToStringSid and then use the result... Suggestions are very welcome
90	*/
91	#define RTLOCALIPC_WIN_SDDL \
92	SDDL_DACL SDDL_DELIMINATOR \
93	SDDL_ACE_BEGIN SDDL_ACCESS_DENIED ";;" SDDL_GENERIC_ALL ";;;" SDDL_NETWORK SDDL_ACE_END \
94	SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED ";;" "0x0012019b" ";;;" SDDL_EVERYONE SDDL_ACE_END \
95	SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED ";;" SDDL_FILE_ALL ";;;" SDDL_LOCAL_SYSTEM SDDL_ACE_END
96
97	// SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED ";;" SDDL_GENERIC_ALL ";;;" SDDL_PERSONAL_SELF SDDL_ACE_END \
98	// SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED ";CIOI;" SDDL_GENERIC_ALL ";;;" SDDL_CREATOR_OWNER SDDL_ACE_END
99	// SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED ";;" "0x0012019b" ";;;" SDDL_EVERYONE SDDL_ACE_END
100	// SDDL_ACE_BEGIN SDDL_ACCESS_ALLOWED ";;" SDDL_FILE_ALL ";;;" SDDL_LOCAL_SYSTEM SDDL_ACE_END
101
102
103	/*******************************************************************************
104	* Structures and Typedefs *
105	*******************************************************************************/
106	/**
107	* Local IPC service instance, Windows.
108	*/
109	typedef struct RTLOCALIPCSERVERINT
110	{
111	/** The magic (RTLOCALIPCSERVER_MAGIC). */
112	uint32_t u32Magic;
113	/** The creation flags. */
114	uint32_t fFlags;
115	/** Critical section protecting the structure. */
116	RTCRITSECT CritSect;
117	/** The number of references to the instance.
118	* @remarks The reference counting isn't race proof. */
119	uint32_t volatile cRefs;
120	/** Indicates that there is a pending cancel request. */
121	bool volatile fCancelled;
122	/** The name pipe handle. */
123	HANDLE hNmPipe;
124	/** The handle to the event object we're using for overlapped I/O. */
125	HANDLE hEvent;
126	/** The overlapped I/O structure. */
127	OVERLAPPED OverlappedIO;
128	/** The pipe name. */
129	char szName[1];
130	} RTLOCALIPCSERVERINT;
131	/** Pointer to a local IPC server instance (Windows). */
132	typedef RTLOCALIPCSERVERINT *PRTLOCALIPCSERVERINT;
133
134
135	/**
136	* Local IPC session instance, Windows.
137	*/
138	typedef struct RTLOCALIPCSESSIONINT
139	{
140	/** The magic (RTLOCALIPCSESSION_MAGIC). */
141	uint32_t u32Magic;
142	/** Critical section protecting the structure. */
143	RTCRITSECT CritSect;
144	/** The number of references to the instance.
145	* @remarks The reference counting isn't race proof. */
146	uint32_t volatile cRefs;
147	/** Indicates that there is a pending cancel request. */
148	bool volatile fCancelled;
149	/** The name pipe handle. */
150	HANDLE hNmPipe;
151	/** The handle to the event object we're using for overlapped I/O. */
152	HANDLE hEvent;
153	/** The overlapped I/O structure. */
154	OVERLAPPED OverlappedIO;
155	} RTLOCALIPCSESSIONINT;
156	/** Pointer to a local IPC session instance (Windows). */
157	typedef RTLOCALIPCSESSIONINT *PRTLOCALIPCSESSIONINT;
158
159
160	/*******************************************************************************
161	* Internal Functions *
162	*******************************************************************************/
163	static int rtLocalIpcWinCreateSession(PRTLOCALIPCSESSION phClientSession, HANDLE hNmPipeSession);
164
165
166	/**
167	* Creates a named pipe instance.
168	*
169	* This is used by both RTLocalIpcServerCreate and RTLocalIpcServerListen.
170	*
171	* @returns Windows error code, that is NO_ERROR and phNmPipe on success and some ERROR_ on failure.
172	*
173	* @param phNmPipe Where to store the named pipe handle on success. This
174	* will be set to INVALID_HANDLE_VALUE on failure.
175	* @param pszFullPipeName The full named pipe name.
176	* @param fFirst Set on the first call (from RTLocalIpcServerCreate), otherwise clear.
177	* Governs the FILE_FLAG_FIRST_PIPE_INSTANCE flag.
178	*/
179	static DWORD rtLocalIpcServerWinCreatePipeInstance(PHANDLE phNmPipe, const char *pszFullPipeName, bool fFirst)
180	{
181	*phNmPipe = INVALID_HANDLE_VALUE;
182
183	/*
184	* We'll create a security descriptor from a SDDL that denies
185	* access to network clients (this is local IPC after all), it
186	* makes some further restrictions to prevent non-authenticated
187	* users from screwing around.
188	*/
189	DWORD err;
190	PSECURITY_DESCRIPTOR pSecDesc = NULL;
191	#if 0 /** @todo dynamically resolve this as it is the only thing that prevents
192	* loading IPRT on NT4. */
193	if (ConvertStringSecurityDescriptorToSecurityDescriptor(RTLOCALIPC_WIN_SDDL,
194	SDDL_REVISION_1,
195	&pSecDesc,
196	NULL))
197	#else
198	AssertFatalFailed();
199	SetLastError(-1);
200	if (0)
201	#endif
202	{
203	SECURITY_ATTRIBUTES SecAttrs;
204	SecAttrs.nLength = sizeof(SecAttrs);
205	SecAttrs.lpSecurityDescriptor = pSecDesc;
206	SecAttrs.bInheritHandle = FALSE;
207
208	DWORD fOpenMode = PIPE_ACCESS_DUPLEX
209	\| PIPE_WAIT
210	\| FILE_FLAG_OVERLAPPED;
211	if (fFirst)
212	fOpenMode \|= FILE_FLAG_FIRST_PIPE_INSTANCE; /* Note! Requires W2K SP2+. */
213
214	HANDLE hNmPipe = CreateNamedPipe(pszFullPipeName, /* lpName */
215	fOpenMode, /* dwOpenMode */
216	PIPE_TYPE_BYTE, /* dwPipeMode */
217	PIPE_UNLIMITED_INSTANCES, /* nMaxInstances */
218	PAGE_SIZE, /* nOutBufferSize (advisory) */
219	PAGE_SIZE, /* nInBufferSize (ditto) */
220	301000, / nDefaultTimeOut = 30 sec */
221	&SecAttrs); /* lpSecurityAttributes */
222	err = GetLastError();
223	LocalFree(pSecDesc);
224	if (hNmPipe != INVALID_HANDLE_VALUE)
225	{
226	*phNmPipe = hNmPipe;
227	return NO_ERROR;
228	}
229	}
230	else
231	err = GetLastError();
232
233	AssertReturn(err != NO_ERROR, ERROR_GEN_FAILURE);
234	return err;
235	}
236
237
238	RTDECL(int) RTLocalIpcServerCreate(PRTLOCALIPCSERVER phServer, const char *pszName, uint32_t fFlags)
239	{
240	/*
241	* Basic parameter validation.
242	*/
243	AssertPtrReturn(phServer, VERR_INVALID_POINTER);
244	AssertPtrReturn(pszName, VERR_INVALID_POINTER);
245	AssertReturn(*pszName, VERR_INVALID_PARAMETER);
246	AssertReturn(!(fFlags & ~(RTLOCALIPC_FLAGS_VALID_MASK)), VERR_INVALID_PARAMETER);
247
248	AssertReturn(fFlags & RTLOCALIPC_FLAGS_MULTI_SESSION, VERR_NOT_IMPLEMENTED); /** @todo implement !RTLOCALIPC_FLAGS_MULTI_SESSION */
249
250	/*
251	* Allocate and initialize the instance data.
252	*/
253	size_t cchName = strlen(pszName);
254	size_t cch = RT_OFFSETOF(RTLOCALIPCSERVERINT, szName[cchName + sizeof(RTLOCALIPC_WIN_PREFIX)]);
255	PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)RTMemAlloc(cch);
256	if (!pThis)
257	return VERR_NO_MEMORY;
258	pThis->u32Magic = RTLOCALIPCSERVER_MAGIC;
259	pThis->cRefs = 1; /* the one we return */
260	pThis->fCancelled = false;
261	memcpy(pThis->szName, RTLOCALIPC_WIN_PREFIX, sizeof(RTLOCALIPC_WIN_PREFIX) - 1);
262	memcpy(&pThis->szName[sizeof(RTLOCALIPC_WIN_PREFIX) - 1], pszName, cchName + 1);
263	int rc = RTCritSectInit(&pThis->CritSect);
264	if (RT_SUCCESS(rc))
265	{
266	DWORD err = NO_ERROR;
267	pThis->hEvent = CreateEvent(NULL /lpEventAttributes/, TRUE /bManualReset/, FALSE /bInitialState/, NULL /lpName/);
268	if (pThis->hEvent != NULL)
269	{
270	memset(&pThis->OverlappedIO, 0, sizeof(pThis->OverlappedIO));
271	pThis->OverlappedIO.Internal = STATUS_PENDING;
272	pThis->OverlappedIO.hEvent = pThis->hEvent;
273
274	err = rtLocalIpcServerWinCreatePipeInstance(&pThis->hNmPipe, pThis->szName, true /* fFirst */);
275	if (err == NO_ERROR)
276	{
277	*phServer = pThis;
278	return VINF_SUCCESS;
279	}
280	}
281	else
282	err = GetLastError();
283	rc = RTErrConvertFromWin32(err);
284	}
285	RTMemFree(pThis);
286	return rc;
287	}
288
289
290	/**
291	* Call when the reference count reaches 0.
292	* Caller owns the critsect.
293	* @param pThis The instance to destroy.
294	*/
295	static void rtLocalIpcServerWinDestroy(PRTLOCALIPCSERVERINT pThis)
296	{
297	BOOL fRc = CloseHandle(pThis->hNmPipe);
298	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
299	pThis->hNmPipe = INVALID_HANDLE_VALUE;
300
301	fRc = CloseHandle(pThis->hEvent);
302	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
303	pThis->hEvent = NULL;
304
305	RTCritSectLeave(&pThis->CritSect);
306	RTCritSectDelete(&pThis->CritSect);
307
308	RTMemFree(pThis);
309	}
310
311
312	RTDECL(int) RTLocalIpcServerDestroy(RTLOCALIPCSERVER hServer)
313	{
314	/*
315	* Validate input.
316	*/
317	if (hServer == NIL_RTLOCALIPCSERVER)
318	return VINF_SUCCESS;
319	PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)hServer;
320	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
321	AssertReturn(pThis->u32Magic == RTLOCALIPCSERVER_MAGIC, VERR_INVALID_MAGIC);
322
323	/*
324	* Cancel any thread currently busy using the server,
325	* leaving the cleanup to it.
326	*/
327	RTCritSectEnter(&pThis->CritSect);
328	ASMAtomicUoWriteU32(&pThis->u32Magic, ~RTLOCALIPCSERVER_MAGIC);
329	ASMAtomicUoWriteBool(&pThis->fCancelled, true);
330	pThis->cRefs--;
331
332	if (pThis->cRefs > 0)
333	{
334	BOOL fRc = SetEvent(pThis->hEvent);
335	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
336
337	RTCritSectLeave(&pThis->CritSect);
338	}
339	else
340	rtLocalIpcServerWinDestroy(pThis);
341
342	return VINF_SUCCESS;
343	}
344
345
346	RTDECL(int) RTLocalIpcServerListen(RTLOCALIPCSERVER hServer, PRTLOCALIPCSESSION phClientSession)
347	{
348	/*
349	* Validate input.
350	*/
351	PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)hServer;
352	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
353	AssertReturn(pThis->u32Magic == RTLOCALIPCSERVER_MAGIC, VERR_INVALID_MAGIC);
354
355	/*
356	* Enter the critsect before inspecting the object further.
357	*/
358	int rc;
359	RTCritSectEnter(&pThis->CritSect);
360	if (pThis->fCancelled)
361	{
362	pThis->fCancelled = false;
363	rc = VERR_CANCELLED;
364	RTCritSectLeave(&pThis->CritSect);
365	}
366	else
367	{
368	pThis->cRefs++;
369	ResetEvent(pThis->hEvent);
370	RTCritSectLeave(&pThis->CritSect);
371
372	/*
373	* Try connect a client. We need to use overlapped I/O here because
374	* of the cancellation a by RTLocalIpcServerCancel and RTLocalIpcServerDestroy.
375	*/
376	SetLastError(NO_ERROR);
377	BOOL fRc = ConnectNamedPipe(pThis->hNmPipe, &pThis->OverlappedIO);
378	DWORD err = fRc ? NO_ERROR : GetLastError();
379	if ( !fRc
380	&& err == ERROR_IO_PENDING)
381	{
382	WaitForSingleObject(pThis->hEvent, INFINITE);
383	DWORD dwIgnored;
384	fRc = GetOverlappedResult(pThis->hNmPipe, &pThis->OverlappedIO, &dwIgnored, FALSE /* bWait*/);
385	err = fRc ? NO_ERROR : GetLastError();
386	}
387
388	RTCritSectEnter(&pThis->CritSect);
389	if ( !pThis->fCancelled
390	&& pThis->u32Magic == RTLOCALIPCSERVER_MAGIC)
391	{
392	/*
393	* Still alive, some error or an actual client.
394	*
395	* If it's the latter we'll have to create a new pipe instance that
396	* replaces the current one for the server. The current pipe instance
397	* will be assigned to the client session.
398	*/
399	if ( fRc
400	\|\| err == ERROR_PIPE_CONNECTED)
401	{
402	HANDLE hNmPipe;
403	DWORD err = rtLocalIpcServerWinCreatePipeInstance(&hNmPipe, pThis->szName, false /* fFirst */);
404	if (err == NO_ERROR)
405	{
406	HANDLE hNmPipeSession = pThis->hNmPipe; /* consumed */
407	pThis->hNmPipe = hNmPipe;
408	rc = rtLocalIpcWinCreateSession(phClientSession, hNmPipeSession);
409	}
410	else
411	{
412	/*
413	* We failed to create a new instance for the server, disconnect
414	* the client and fail. Don't try service the client here.
415	*/
416	rc = RTErrConvertFromWin32(err);
417	fRc = DisconnectNamedPipe(pThis->hNmPipe);
418	AssertMsg(fRc, ("%d\n", GetLastError()));
419	}
420	}
421	else
422	rc = RTErrConvertFromWin32(err);
423	}
424	else
425	{
426	/*
427	* Cancelled or destroyed.
428	*
429	* Cancel the overlapped io if it didn't complete (must be done
430	* in the this thread) or disconnect the client.
431	*/
432	if ( fRc
433	\|\| err == ERROR_PIPE_CONNECTED)
434	fRc = DisconnectNamedPipe(pThis->hNmPipe);
435	else if (err == ERROR_IO_PENDING)
436	fRc = CancelIo(pThis->hNmPipe);
437	else
438	fRc = TRUE;
439	AssertMsg(fRc, ("%d\n", GetLastError()));
440	rc = VERR_CANCELLED;
441	}
442
443	pThis->cRefs--;
444	if (pThis->cRefs)
445	RTCritSectLeave(&pThis->CritSect);
446	else
447	rtLocalIpcServerWinDestroy(pThis);
448	}
449
450	return rc;
451	}
452
453
454	RTDECL(int) RTLocalIpcServerCancel(RTLOCALIPCSERVER hServer)
455	{
456	/*
457	* Validate input.
458	*/
459	PRTLOCALIPCSERVERINT pThis = (PRTLOCALIPCSERVERINT)hServer;
460	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
461	AssertReturn(pThis->u32Magic == RTLOCALIPCSERVER_MAGIC, VERR_INVALID_MAGIC);
462
463	/*
464	* Enter the critical section, then set the cancellation flag
465	* and signal the event (to wake up anyone in/at WaitForSingleObject).
466	*/
467	RTCritSectEnter(&pThis->CritSect);
468
469	ASMAtomicUoWriteBool(&pThis->fCancelled, true);
470	BOOL fRc = SetEvent(pThis->hEvent);
471	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
472
473	RTCritSectLeave(&pThis->CritSect);
474
475	return VINF_SUCCESS;
476	}
477
478
479	/**
480	* Create a session instance.
481	*
482	* @returns IPRT status code.
483	*
484	* @param phClientSession Where to store the session handle on success.
485	* @param hNmPipeSession The named pipe handle. This will be consumed by this session, meaning on failure
486	* to create the session it will be closed.
487	*/
488	static int rtLocalIpcWinCreateSession(PRTLOCALIPCSESSION phClientSession, HANDLE hNmPipeSession)
489	{
490	int rc;
491
492	/*
493	* Allocate and initialize the session instance data.
494	*/
495	PRTLOCALIPCSESSIONINT pThis = (PRTLOCALIPCSESSIONINT)RTMemAlloc(sizeof(*pThis));
496	if (pThis)
497	{
498	pThis->u32Magic = RTLOCALIPCSESSION_MAGIC;
499	pThis->cRefs = 1; /* our ref */
500	pThis->fCancelled = false;
501	pThis->hNmPipe = hNmPipeSession;
502
503	rc = RTCritSectInit(&pThis->CritSect);
504	if (RT_SUCCESS(rc))
505	{
506	pThis->hEvent = CreateEvent(NULL /lpEventAttributes/, TRUE /bManualReset/, FALSE /bInitialState/, NULL /lpName/);
507	if (pThis->hEvent != NULL)
508	{
509	memset(&pThis->OverlappedIO, 0, sizeof(pThis->OverlappedIO));
510	pThis->OverlappedIO.Internal = STATUS_PENDING;
511	pThis->OverlappedIO.hEvent = pThis->hEvent;
512
513	*phClientSession = pThis;
514	return VINF_SUCCESS;
515	}
516
517	/* bail out */
518	rc = RTErrConvertFromWin32(GetLastError());
519	RTCritSectDelete(&pThis->CritSect);
520	}
521	RTMemFree(pThis);
522	}
523	else
524	rc = VERR_NO_MEMORY;
525
526	BOOL fRc = CloseHandle(hNmPipeSession);
527	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
528	return rc;
529	}
530
531
532	RTDECL(int) RTLocalIpcSessionConnect(PRTLOCALIPCSESSION phSession, const char *pszName, uint32_t fFlags)
533	{
534	return VINF_SUCCESS;
535	}
536
537
538	/**
539	* Call when the reference count reaches 0.
540	* Caller owns the critsect.
541	* @param pThis The instance to destroy.
542	*/
543	static void rtLocalIpcSessionWinDestroy(PRTLOCALIPCSESSIONINT pThis)
544	{
545	BOOL fRc = CloseHandle(pThis->hNmPipe);
546	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
547	pThis->hNmPipe = INVALID_HANDLE_VALUE;
548
549	fRc = CloseHandle(pThis->hEvent);
550	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
551	pThis->hEvent = NULL;
552
553	RTCritSectLeave(&pThis->CritSect);
554	RTCritSectDelete(&pThis->CritSect);
555
556	RTMemFree(pThis);
557	}
558
559
560	RTDECL(int) RTLocalIpcSessionClose(RTLOCALIPCSESSION hSession)
561	{
562	/*
563	* Validate input.
564	*/
565	if (hSession == NIL_RTLOCALIPCSESSION)
566	return VINF_SUCCESS;
567	PRTLOCALIPCSESSIONINT pThis = (RTLOCALIPCSESSION)hSession;
568	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
569	AssertReturn(pThis->u32Magic != RTLOCALIPCSESSION_MAGIC, VERR_INVALID_MAGIC);
570
571	/*
572	* Cancel any thread currently busy using the session,
573	* leaving the cleanup to it.
574	*/
575	RTCritSectEnter(&pThis->CritSect);
576	ASMAtomicUoWriteU32(&pThis->u32Magic, ~RTLOCALIPCSESSION_MAGIC);
577	ASMAtomicUoWriteBool(&pThis->fCancelled, true);
578	pThis->cRefs--;
579
580	if (pThis->cRefs > 0)
581	{
582	BOOL fRc = SetEvent(pThis->hEvent);
583	AssertMsg(fRc, ("%d\n", GetLastError())); NOREF(fRc);
584
585	RTCritSectLeave(&pThis->CritSect);
586	}
587	else
588	rtLocalIpcSessionWinDestroy(pThis);
589
590	return VINF_SUCCESS;
591	}
592
593
594	RTDECL(int) RTLocalIpcSessionRead(RTLOCALIPCSESSION hSession, void pvBuffer, size_t cbBuffer, size_t pcbRead)
595	{
596	return VINF_SUCCESS;
597	}
598
599
600	RTDECL(int) RTLocalIpcSessionWrite(RTLOCALIPCSESSION hSession, const void *pvBuffer, size_t cbBuffer)
601	{
602	return VINF_SUCCESS;
603	}
604
605
606	RTDECL(int) RTLocalIpcSessionFlush(RTLOCALIPCSESSION hSession)
607	{
608	return VINF_SUCCESS;
609	}
610
611
612	RTDECL(int) RTLocalIpcSessionWaitForData(RTLOCALIPCSESSION hSession, uint32_t cMillies)
613	{
614	RTThreadSleep(1000);
615	return VINF_SUCCESS;
616	}
617
618
619	RTDECL(int) RTLocalIpcSessionCancel(RTLOCALIPCSESSION hSession)
620	{
621	return VINF_SUCCESS;
622	}
623
624
625	RTDECL(int) RTLocalIpcSessionQueryProcess(RTLOCALIPCSESSION hSession, PRTPROCESS pProcess)
626	{
627	return VERR_NOT_SUPPORTED;
628	}
629
630
631	RTDECL(int) RTLocalIpcSessionQueryUserId(RTLOCALIPCSESSION hSession, PRTUID pUid)
632	{
633	return VERR_NOT_SUPPORTED;
634	}
635
636
637	RTDECL(int) RTLocalIpcSessionQueryGroupId(RTLOCALIPCSESSION hSession, PRTUID pUid)
638	{
639	return VERR_NOT_SUPPORTED;
640	}
641

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source: vbox/trunk/src/VBox/Runtime/r3/win/localipc-win.cpp@ 35018

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