poll.cpp@ 76553

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1	/* $Id: poll.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - Polling I/O Handles, Windows+Posix Implementation.
4	*/
5
6	/*
7	* Copyright (C) 2010-2019 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	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include <iprt/cdefs.h>
32	#ifdef RT_OS_WINDOWS
33	# include <iprt/win/windows.h>
34
35	#elif defined(RT_OS_OS2)
36	# define INCL_BASE
37	# include <os2.h>
38	# include <limits.h>
39	# include <sys/socket.h>
40
41	#else
42	# include <limits.h>
43	# include <errno.h>
44	# include <sys/poll.h>
45	#endif
46
47	#include <iprt/poll.h>
48	#include "internal/iprt.h"
49
50	#include <iprt/alloca.h>
51	#include <iprt/asm.h>
52	#include <iprt/assert.h>
53	#include <iprt/err.h>
54	#include <iprt/mem.h>
55	#include <iprt/pipe.h>
56	#include <iprt/socket.h>
57	#include <iprt/string.h>
58	#include <iprt/thread.h>
59	#include <iprt/time.h>
60
61	#include "internal/pipe.h"
62	#define IPRT_INTERNAL_SOCKET_POLLING_ONLY
63	#include "internal/socket.h"
64	#include "internal/magics.h"
65
66
67	/*********************************************************************************************************************************
68	* Defined Constants And Macros *
69	*********************************************************************************************************************************/
70	/** The maximum poll set size.
71	* @remarks To help portability, we set this to the Windows limit. We can lift
72	* this restriction later if it becomes necessary. */
73	#define RTPOLL_SET_MAX 64
74
75
76
77	/*********************************************************************************************************************************
78	* Structures and Typedefs *
79	*********************************************************************************************************************************/
80	/**
81	* Handle entry in a poll set.
82	*/
83	typedef struct RTPOLLSETHNDENT
84	{
85	/** The handle type. */
86	RTHANDLETYPE enmType;
87	/** The handle ID. */
88	uint32_t id;
89	/** The events we're waiting for here. */
90	uint32_t fEvents;
91	/** Set if this is the final entry for this handle.
92	* If the handle is entered more than once, this will be clear for all but
93	* the last entry. */
94	bool fFinalEntry;
95	/** The handle union. */
96	RTHANDLEUNION u;
97	} RTPOLLSETHNDENT;
98	/** Pointer to a handle entry. */
99	typedef RTPOLLSETHNDENT *PRTPOLLSETHNDENT;
100
101
102	/**
103	* Poll set data.
104	*/
105	typedef struct RTPOLLSETINTERNAL
106	{
107	/** The magic value (RTPOLLSET_MAGIC). */
108	uint32_t u32Magic;
109	/** Set when someone is polling or making changes. */
110	bool volatile fBusy;
111
112	/** The number of allocated handles. */
113	uint16_t cHandlesAllocated;
114	/** The number of valid handles in the set. */
115	uint16_t cHandles;
116
117	#ifdef RT_OS_WINDOWS
118	/** Pointer to an array of native handles. */
119	HANDLE *pahNative;
120	#elif defined(RT_OS_OS2)
121	/** The semaphore records. */
122	PSEMRECORD paSemRecs;
123	/** The multiple wait semaphore used for non-socket waits. */
124	HMUX hmux;
125	/** os2_select template. */
126	int *pafdSelect;
127	/** The number of sockets to monitor for read. */
128	uint16_t cReadSockets;
129	/** The number of sockets to monitor for write. */
130	uint16_t cWriteSockets;
131	/** The number of sockets to monitor for exceptions. */
132	uint16_t cXcptSockets;
133	/** The number of pipes. */
134	uint16_t cPipes;
135	/** Pointer to an array of native handles. */
136	PRTHCINTPTR pahNative;
137	#else
138	/** Pointer to an array of pollfd structures. */
139	struct pollfd *paPollFds;
140	#endif
141	/** Pointer to an array of handles and IDs. */
142	PRTPOLLSETHNDENT paHandles;
143	} RTPOLLSETINTERNAL;
144
145
146
147	/**
148	* Common worker for RTPoll and RTPollNoResume
149	*/
150	static int rtPollNoResumeWorker(RTPOLLSETINTERNAL *pThis, uint64_t MsStart, RTMSINTERVAL cMillies,
151	uint32_t pfEvents, uint32_t pid)
152	{
153	int rc;
154
155	if (RT_UNLIKELY(pThis->cHandles == 0 && cMillies == RT_INDEFINITE_WAIT))
156	return VERR_DEADLOCK;
157
158	/*
159	* Check for special case, RTThreadSleep...
160	*/
161	uint32_t const cHandles = pThis->cHandles;
162	if (cHandles == 0)
163	{
164	rc = RTThreadSleep(cMillies);
165	if (RT_SUCCESS(rc))
166	rc = VERR_TIMEOUT;
167	return rc;
168	}
169
170	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
171	/*
172	* Check + prepare the handles before waiting.
173	*/
174	uint32_t fEvents = 0;
175	bool const fNoWait = cMillies == 0;
176	uint32_t i;
177	for (i = 0; i < cHandles; i++)
178	{
179	switch (pThis->paHandles[i].enmType)
180	{
181	case RTHANDLETYPE_PIPE:
182	fEvents = rtPipePollStart(pThis->paHandles[i].u.hPipe, pThis, pThis->paHandles[i].fEvents,
183	pThis->paHandles[i].fFinalEntry, fNoWait);
184	break;
185
186	case RTHANDLETYPE_SOCKET:
187	fEvents = rtSocketPollStart(pThis->paHandles[i].u.hSocket, pThis, pThis->paHandles[i].fEvents,
188	pThis->paHandles[i].fFinalEntry, fNoWait);
189	break;
190
191	default:
192	AssertFailed();
193	fEvents = UINT32_MAX;
194	break;
195	}
196	if (fEvents)
197	break;
198	}
199	if ( fEvents
200	\|\| fNoWait)
201	{
202
203	if (pid)
204	*pid = pThis->paHandles[i].id;
205	if (pfEvents)
206	*pfEvents = fEvents;
207	rc = !fEvents
208	? VERR_TIMEOUT
209	: fEvents != UINT32_MAX
210	? VINF_SUCCESS
211	: VERR_INTERNAL_ERROR_4;
212
213	/* clean up */
214	if (!fNoWait)
215	while (i-- > 0)
216	{
217	switch (pThis->paHandles[i].enmType)
218	{
219	case RTHANDLETYPE_PIPE:
220	rtPipePollDone(pThis->paHandles[i].u.hPipe, pThis->paHandles[i].fEvents,
221	pThis->paHandles[i].fFinalEntry, false);
222	break;
223
224	case RTHANDLETYPE_SOCKET:
225	rtSocketPollDone(pThis->paHandles[i].u.hSocket, pThis->paHandles[i].fEvents,
226	pThis->paHandles[i].fFinalEntry, false);
227	break;
228
229	default:
230	AssertFailed();
231	break;
232	}
233	}
234
235	return rc;
236	}
237
238
239	/*
240	* Wait.
241	*/
242	# ifdef RT_OS_WINDOWS
243	RT_NOREF_PV(MsStart);
244
245	DWORD dwRc = WaitForMultipleObjectsEx(cHandles, pThis->pahNative,
246	FALSE /fWaitAll /,
247	cMillies == RT_INDEFINITE_WAIT ? INFINITE : cMillies,
248	TRUE /fAlertable/);
249	AssertCompile(WAIT_OBJECT_0 == 0);
250	if (dwRc < WAIT_OBJECT_0 + cHandles)
251	rc = VERR_INTERRUPTED;
252	else if (dwRc == WAIT_TIMEOUT)
253	rc = VERR_TIMEOUT;
254	else if (dwRc == WAIT_IO_COMPLETION)
255	rc = VERR_INTERRUPTED;
256	else if (dwRc == WAIT_FAILED)
257	rc = RTErrConvertFromWin32(GetLastError());
258	else
259	{
260	AssertMsgFailed(("%u (%#x)\n", dwRc, dwRc));
261	rc = VERR_INTERNAL_ERROR_5;
262	}
263
264	# else /* RT_OS_OS2 */
265	APIRET orc;
266	ULONG ulUser = 0;
267	uint16_t cSockets = pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets;
268	if (cSockets == 0)
269	{
270	/* Only pipes. */
271	AssertReturn(pThis->cPipes > 0, VERR_INTERNAL_ERROR_2);
272	orc = DosWaitMuxWaitSem(pThis->hmux,
273	cMillies == RT_INDEFINITE_WAIT ? SEM_INDEFINITE_WAIT : RT_MIN(cMillies, SEM_INDEFINITE_WAIT - 1),
274	&ulUser);
275	rc = RTErrConvertFromOS2(orc);
276	}
277	else
278	{
279	int pafdSelect = (int )alloca(cSockets + 1);
280	if (pThis->cPipes == 0)
281	{
282	/* Only sockets. */
283	memcpy(pafdSelect, pThis->pafdSelect, sizeof(pThis->pafdSelect[0]) * (cSockets + 1));
284	rc = os2_select(pafdSelect, pThis->cReadSockets, pThis->cWriteSockets, pThis->cXcptSockets,
285	cMillies == RT_INDEFINITE_WAIT ? -1 : (long)RT_MIN(cMillies, LONG_MAX));
286	if (rc > 0)
287	rc = VINF_SUCCESS;
288	else if (rc == 0)
289	rc = VERR_TIMEOUT;
290	else
291	rc = RTErrConvertFromErrno(sock_errno());
292	}
293	else
294	{
295	/* Mix of both - taking the easy way out, not optimal, but whatever... */
296	do
297	{
298	orc = DosWaitMuxWaitSem(pThis->hmux, 8, &ulUser);
299	if (orc != ERROR_TIMEOUT && orc != ERROR_SEM_TIMEOUT)
300	{
301	rc = RTErrConvertFromOS2(orc);
302	break;
303	}
304
305	memcpy(pafdSelect, pThis->pafdSelect, sizeof(pThis->pafdSelect[0]) * (cSockets + 1));
306	rc = os2_select(pafdSelect, pThis->cReadSockets, pThis->cWriteSockets, pThis->cXcptSockets, 8);
307	if (rc != 0)
308	{
309	if (rc > 0)
310	rc = VINF_SUCCESS;
311	else
312	rc = RTErrConvertFromErrno(sock_errno());
313	break;
314	}
315	} while (cMillies == RT_INDEFINITE_WAIT \|\| RTTimeMilliTS() - MsStart < cMillies);
316	}
317	}
318	# endif /* RT_OS_OS2 */
319
320	/*
321	* Get event (if pending) and do wait cleanup.
322	*/
323	bool fHarvestEvents = true;
324	for (i = 0; i < cHandles; i++)
325	{
326	fEvents = 0;
327	switch (pThis->paHandles[i].enmType)
328	{
329	case RTHANDLETYPE_PIPE:
330	fEvents = rtPipePollDone(pThis->paHandles[i].u.hPipe, pThis->paHandles[i].fEvents,
331	pThis->paHandles[i].fFinalEntry, fHarvestEvents);
332	break;
333
334	case RTHANDLETYPE_SOCKET:
335	fEvents = rtSocketPollDone(pThis->paHandles[i].u.hSocket, pThis->paHandles[i].fEvents,
336	pThis->paHandles[i].fFinalEntry, fHarvestEvents);
337	break;
338
339	default:
340	AssertFailed();
341	break;
342	}
343	if ( fEvents
344	&& fHarvestEvents)
345	{
346	Assert(fEvents != UINT32_MAX);
347	fHarvestEvents = false;
348	if (pfEvents)
349	*pfEvents = fEvents;
350	if (pid)
351	*pid = pThis->paHandles[i].id;
352	rc = VINF_SUCCESS;
353	}
354	}
355
356	#else /* POSIX */
357
358	RT_NOREF_PV(MsStart);
359
360	/* clear the revents. */
361	uint32_t i = pThis->cHandles;
362	while (i-- > 0)
363	pThis->paPollFds[i].revents = 0;
364
365	rc = poll(&pThis->paPollFds[0], pThis->cHandles,
366	cMillies == RT_INDEFINITE_WAIT \|\| cMillies >= INT_MAX
367	? -1
368	: (int)cMillies);
369	if (rc == 0)
370	return VERR_TIMEOUT;
371	if (rc < 0)
372	return RTErrConvertFromErrno(errno);
373	for (i = 0; i < pThis->cHandles; i++)
374	if (pThis->paPollFds[i].revents)
375	{
376	if (pfEvents)
377	{
378	*pfEvents = 0;
379	if (pThis->paPollFds[i].revents & (POLLIN
380	# ifdef POLLRDNORM
381	\| POLLRDNORM /* just in case */
382	# endif
383	# ifdef POLLRDBAND
384	\| POLLRDBAND /* ditto */
385	# endif
386	# ifdef POLLPRI
387	\| POLLPRI /* ditto */
388	# endif
389	# ifdef POLLMSG
390	\| POLLMSG /* ditto */
391	# endif
392	# ifdef POLLWRITE
393	\| POLLWRITE /* ditto */
394	# endif
395	# ifdef POLLEXTEND
396	\| POLLEXTEND /* ditto */
397	# endif
398	)
399	)
400	*pfEvents \|= RTPOLL_EVT_READ;
401
402	if (pThis->paPollFds[i].revents & (POLLOUT
403	# ifdef POLLWRNORM
404	\| POLLWRNORM /* just in case */
405	# endif
406	# ifdef POLLWRBAND
407	\| POLLWRBAND /* ditto */
408	# endif
409	)
410	)
411	*pfEvents \|= RTPOLL_EVT_WRITE;
412
413	if (pThis->paPollFds[i].revents & (POLLERR \| POLLHUP \| POLLNVAL
414	# ifdef POLLRDHUP
415	\| POLLRDHUP
416	# endif
417	)
418	)
419	*pfEvents \|= RTPOLL_EVT_ERROR;
420	}
421	if (pid)
422	*pid = pThis->paHandles[i].id;
423	return VINF_SUCCESS;
424	}
425
426	AssertFailed();
427	RTThreadYield();
428	rc = VERR_INTERRUPTED;
429
430	#endif /* POSIX */
431
432	return rc;
433	}
434
435
436	RTDECL(int) RTPoll(RTPOLLSET hPollSet, RTMSINTERVAL cMillies, uint32_t pfEvents, uint32_t pid)
437	{
438	RTPOLLSETINTERNAL *pThis = hPollSet;
439	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
440	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
441	AssertPtrNull(pfEvents);
442	AssertPtrNull(pid);
443
444	/*
445	* Set the busy flag and do the job.
446	*/
447	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
448
449	int rc;
450	if (cMillies == RT_INDEFINITE_WAIT \|\| cMillies == 0)
451	{
452	do rc = rtPollNoResumeWorker(pThis, 0, cMillies, pfEvents, pid);
453	while (rc == VERR_INTERRUPTED);
454	}
455	else
456	{
457	uint64_t MsStart = RTTimeMilliTS();
458	rc = rtPollNoResumeWorker(pThis, MsStart, cMillies, pfEvents, pid);
459	while (RT_UNLIKELY(rc == VERR_INTERRUPTED))
460	{
461	if (RTTimeMilliTS() - MsStart >= cMillies)
462	{
463	rc = VERR_TIMEOUT;
464	break;
465	}
466	rc = rtPollNoResumeWorker(pThis, MsStart, cMillies, pfEvents, pid);
467	}
468	}
469
470	ASMAtomicWriteBool(&pThis->fBusy, false);
471
472	return rc;
473	}
474
475
476	RTDECL(int) RTPollNoResume(RTPOLLSET hPollSet, RTMSINTERVAL cMillies, uint32_t pfEvents, uint32_t pid)
477	{
478	RTPOLLSETINTERNAL *pThis = hPollSet;
479	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
480	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
481	AssertPtrNull(pfEvents);
482	AssertPtrNull(pid);
483
484	/*
485	* Set the busy flag and do the job.
486	*/
487	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
488
489	int rc;
490	if (cMillies == RT_INDEFINITE_WAIT \|\| cMillies == 0)
491	rc = rtPollNoResumeWorker(pThis, 0, cMillies, pfEvents, pid);
492	else
493	rc = rtPollNoResumeWorker(pThis, RTTimeMilliTS(), cMillies, pfEvents, pid);
494
495	ASMAtomicWriteBool(&pThis->fBusy, false);
496
497	return rc;
498	}
499
500
501	RTDECL(int) RTPollSetCreate(PRTPOLLSET phPollSet)
502	{
503	AssertPtrReturn(phPollSet, VERR_INVALID_POINTER);
504	RTPOLLSETINTERNAL pThis = (RTPOLLSETINTERNAL )RTMemAlloc(sizeof(RTPOLLSETINTERNAL));
505	if (!pThis)
506	return VERR_NO_MEMORY;
507
508	pThis->fBusy = false;
509	pThis->cHandles = 0;
510	pThis->cHandlesAllocated = 0;
511	#ifdef RT_OS_WINDOWS
512	pThis->pahNative = NULL;
513	#elif defined(RT_OS_OS2)
514	pThis->hmux = NULLHANDLE;
515	APIRET orc = DosCreateMuxWaitSem(NULL, &pThis->hmux, 0, NULL, DCMW_WAIT_ANY);
516	if (orc != NO_ERROR)
517	{
518	RTMemFree(pThis);
519	return RTErrConvertFromOS2(orc);
520	}
521	pThis->pafdSelect = NULL;
522	pThis->cReadSockets = 0;
523	pThis->cWriteSockets = 0;
524	pThis->cXcptSockets = 0;
525	pThis->cPipes = 0;
526	pThis->pahNative = NULL;
527	#else
528	pThis->paPollFds = NULL;
529	#endif
530	pThis->paHandles = NULL;
531	pThis->u32Magic = RTPOLLSET_MAGIC;
532
533	*phPollSet = pThis;
534	return VINF_SUCCESS;
535	}
536
537
538	RTDECL(int) RTPollSetDestroy(RTPOLLSET hPollSet)
539	{
540	RTPOLLSETINTERNAL *pThis = hPollSet;
541	if (pThis == NIL_RTPOLLSET)
542	return VINF_SUCCESS;
543	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
544	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
545	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
546
547	ASMAtomicWriteU32(&pThis->u32Magic, ~RTPOLLSET_MAGIC);
548	#ifdef RT_OS_WINDOWS
549	RTMemFree(pThis->pahNative);
550	pThis->pahNative = NULL;
551	#elif defined(RT_OS_OS2)
552	DosCloseMuxWaitSem(pThis->hmux);
553	pThis->hmux = NULLHANDLE;
554	RTMemFree(pThis->pafdSelect);
555	pThis->pafdSelect = NULL;
556	RTMemFree(pThis->pahNative);
557	pThis->pahNative = NULL;
558	#else
559	RTMemFree(pThis->paPollFds);
560	pThis->paPollFds = NULL;
561	#endif
562	RTMemFree(pThis->paHandles);
563	pThis->paHandles = NULL;
564	RTMemFree(pThis);
565
566	return VINF_SUCCESS;
567	}
568
569	#ifdef RT_OS_OS2
570
571	/**
572	* Checks if @a fd is in the specific socket subset.
573	*
574	* @returns true / false.
575	* @param pThis The poll set instance.
576	* @param iStart The index to start at.
577	* @param cFds The number of sockets to check.
578	* @param fd The socket to look for.
579	*/
580	static bool rtPollSetOs2IsSocketInSet(RTPOLLSETINTERNAL *pThis, uint16_t iStart, uint16_t cFds, int fd)
581	{
582	int const *pfd = pThis->pafdSelect + iStart;
583	while (cFds-- > 0)
584	{
585	if (*pfd == fd)
586	return true;
587	pfd++;
588	}
589	return false;
590	}
591
592
593	/**
594	* Removes a socket from a select template subset.
595	*
596	* @param pThis The poll set instance.
597	* @param iStart The index to start at.
598	* @param pcSubSet The subset counter to decrement.
599	* @param fd The socket to remove.
600	*/
601	static void rtPollSetOs2RemoveSocket(RTPOLLSETINTERNAL pThis, uint16_t iStart, uint16_t pcFds, int fd)
602	{
603	uint16_t cFds = *pcFds;
604	while (cFds-- > 0)
605	{
606	if (pThis->pafdSelect[iStart] == fd)
607	break;
608	iStart++;
609	}
610	AssertReturnVoid(iStart != UINT16_MAX);
611
612	/* Note! We keep a -1 entry at the end of the set, thus the + 1. */
613	memmove(&pThis->pafdSelect[iStart],
614	&pThis->pafdSelect[iStart + 1],
615	pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets + 1 - 1 - iStart);
616	*pcFds -= 1;
617
618	Assert(pThis->pafdSelect[pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets] == -1);
619	}
620
621
622	/**
623	* Adds a socket to a select template subset.
624	*
625	* @param pThis The poll set instance.
626	* @param iInsert The insertion point.
627	* ASSUMED to be at the end of the subset.
628	* @param pcSubSet The subset counter to increment.
629	* @param fd The socket to add.
630	*/
631	static void rtPollSetOs2AddSocket(RTPOLLSETINTERNAL pThis, uint16_t iInsert, uint16_t pcFds, int fd)
632	{
633	Assert(!rtPollSetOs2IsSocketInSet(pThis, iInsert - pcFds, pcFds, fd));
634
635	/* Note! We keep a -1 entry at the end of the set, thus the + 1. */
636	memmove(&pThis->pafdSelect[iInsert + 1],
637	&pThis->pafdSelect[iInsert],
638	pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets + 1 - iInsert);
639	pThis->pafdSelect[iInsert] = fd;
640	*pcFds += 1;
641
642	Assert(pThis->pafdSelect[pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets] == -1);
643	}
644
645
646	/**
647	* OS/2 specific RTPollSetAdd worker.
648	*
649	* @returns IPRT status code.
650	* @param pThis The poll set instance.
651	* @param i The index of the new handle (not committed).
652	* @param fEvents The events to poll for.
653	*/
654	static int rtPollSetOs2Add(RTPOLLSETINTERNAL *pThis, unsigned i, uint32_t fEvents)
655	{
656	if (pThis->paHandles[i].enmType == RTHANDLETYPE_SOCKET)
657	{
658	int const fdSocket = pThis->pahNative[i];
659	if ( (fEvents & RTPOLL_EVT_READ)
660	&& rtPollSetOs2IsSocketInSet(pThis, 0, pThis->cReadSockets, fdSocket))
661	rtPollSetOs2AddSocket(pThis, pThis->cReadSockets, &pThis->cReadSockets, fdSocket);
662
663	if ( (fEvents & RTPOLL_EVT_WRITE)
664	&& rtPollSetOs2IsSocketInSet(pThis, pThis->cReadSockets, pThis->cWriteSockets, fdSocket))
665	rtPollSetOs2AddSocket(pThis, pThis->cReadSockets + pThis->cWriteSockets, &pThis->cWriteSockets, fdSocket);
666
667	if ( (fEvents & RTPOLL_EVT_ERROR)
668	&& rtPollSetOs2IsSocketInSet(pThis, pThis->cReadSockets + pThis->cWriteSockets, pThis->cXcptSockets, fdSocket))
669	rtPollSetOs2AddSocket(pThis, pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets,
670	&pThis->cXcptSockets, fdSocket);
671	}
672	else if (pThis->paHandles[i].enmType == RTHANDLETYPE_PIPE)
673	{
674	SEMRECORD Rec = { (HSEM)pThis->pahNative[i], pThis->paHandles[i].id };
675	APIRET orc = DosAddMuxWaitSem(pThis->hmux, &Rec);
676	if (orc != NO_ERROR && orc != ERROR_DUPLICATE_HANDLE)
677	return RTErrConvertFromOS2(orc);
678	pThis->cPipes++;
679	}
680	else
681	AssertFailedReturn(VERR_INTERNAL_ERROR_2);
682	return VINF_SUCCESS;
683	}
684
685	#endif /* RT_OS_OS2 */
686
687	/**
688	* Grows the poll set.
689	*
690	* @returns VINF_SUCCESS or VERR_NO_MEMORY.
691	* @param pThis The poll set instance.
692	* @param cHandlesNew The new poll set size.
693	*/
694	static int rtPollSetGrow(RTPOLLSETINTERNAL *pThis, uint32_t cHandlesNew)
695	{
696	Assert(cHandlesNew > pThis->cHandlesAllocated);
697
698	/* The common array. */
699	void pvNew = RTMemRealloc(pThis->paHandles, cHandlesNew sizeof(pThis->paHandles[0]));
700	if (!pvNew)
701	return VERR_NO_MEMORY;
702	pThis->paHandles = (PRTPOLLSETHNDENT)pvNew;
703
704
705	/* OS specific handles */
706	#if defined(RT_OS_WINDOWS)
707	pvNew = RTMemRealloc(pThis->pahNative, cHandlesNew * sizeof(pThis->pahNative[0]));
708	if (!pvNew)
709	return VERR_NO_MEMORY;
710	pThis->pahNative = (HANDLE *)pvNew;
711
712	#elif defined(RT_OS_OS2)
713	pvNew = RTMemRealloc(pThis->pahNative, cHandlesNew * sizeof(pThis->pahNative[0]));
714	if (!pvNew)
715	return VERR_NO_MEMORY;
716	pThis->pahNative = (PRTHCINTPTR)pvNew;
717
718	pvNew = RTMemRealloc(pThis->pafdSelect, (cHandlesNew * 3 + 1) * sizeof(pThis->pafdSelect[0]));
719	if (!pvNew)
720	return VERR_NO_MEMORY;
721	pThis->pafdSelect = (int *)pvNew;
722	if (pThis->cHandlesAllocated == 0)
723	pThis->pafdSelect[0] = -1;
724
725	#else
726	pvNew = RTMemRealloc(pThis->paPollFds, cHandlesNew * sizeof(pThis->paPollFds[0]));
727	if (!pvNew)
728	return VERR_NO_MEMORY;
729	pThis->paPollFds = (struct pollfd *)pvNew;
730
731	#endif
732
733	pThis->cHandlesAllocated = (uint16_t)cHandlesNew;
734	return VINF_SUCCESS;
735	}
736
737
738	RTDECL(int) RTPollSetAdd(RTPOLLSET hPollSet, PCRTHANDLE pHandle, uint32_t fEvents, uint32_t id)
739	{
740	/*
741	* Validate the input (tedious).
742	*/
743	RTPOLLSETINTERNAL *pThis = hPollSet;
744	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
745	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
746	AssertReturn(!(fEvents & ~RTPOLL_EVT_VALID_MASK), VERR_INVALID_PARAMETER);
747	AssertReturn(fEvents, VERR_INVALID_PARAMETER);
748	AssertReturn(id != UINT32_MAX, VERR_INVALID_PARAMETER);
749
750	if (!pHandle)
751	return VINF_SUCCESS;
752	AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
753	AssertReturn(pHandle->enmType > RTHANDLETYPE_INVALID && pHandle->enmType < RTHANDLETYPE_END, VERR_INVALID_PARAMETER);
754
755	/*
756	* Set the busy flag and do the job.
757	*/
758
759	int rc = VINF_SUCCESS;
760	RTHCINTPTR hNative = -1;
761	RTHANDLEUNION uh;
762	uh.uInt = 0;
763	switch (pHandle->enmType)
764	{
765	case RTHANDLETYPE_PIPE:
766	uh.hPipe = pHandle->u.hPipe;
767	if (uh.hPipe == NIL_RTPIPE)
768	return VINF_SUCCESS;
769	rc = rtPipePollGetHandle(uh.hPipe, fEvents, &hNative);
770	break;
771
772	case RTHANDLETYPE_SOCKET:
773	uh.hSocket = pHandle->u.hSocket;
774	if (uh.hSocket == NIL_RTSOCKET)
775	return VINF_SUCCESS;
776	rc = rtSocketPollGetHandle(uh.hSocket, fEvents, &hNative);
777	break;
778
779	case RTHANDLETYPE_FILE:
780	AssertMsgFailed(("Files are always ready for reading/writing and thus not pollable. Use native APIs for special devices.\n"));
781	rc = VERR_POLL_HANDLE_NOT_POLLABLE;
782	break;
783
784	case RTHANDLETYPE_THREAD:
785	AssertMsgFailed(("Thread handles are currently not pollable\n"));
786	rc = VERR_POLL_HANDLE_NOT_POLLABLE;
787	break;
788
789	default:
790	AssertMsgFailed(("\n"));
791	rc = VERR_POLL_HANDLE_NOT_POLLABLE;
792	break;
793	}
794	if (RT_SUCCESS(rc))
795	{
796	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
797
798	uint32_t const i = pThis->cHandles;
799
800	/* Check that the handle ID doesn't exist already. */
801	uint32_t iPrev = UINT32_MAX;
802	uint32_t j = i;
803	while (j-- > 0)
804	{
805	if (pThis->paHandles[j].id == id)
806	{
807	rc = VERR_POLL_HANDLE_ID_EXISTS;
808	break;
809	}
810	if ( pThis->paHandles[j].enmType == pHandle->enmType
811	&& pThis->paHandles[j].u.uInt == uh.uInt)
812	iPrev = j;
813	}
814
815	/* Check that we won't overflow the poll set now. */
816	if ( RT_SUCCESS(rc)
817	&& i + 1 > RTPOLL_SET_MAX)
818	rc = VERR_POLL_SET_IS_FULL;
819
820	/* Grow the tables if necessary. */
821	if (RT_SUCCESS(rc) && i + 1 > pThis->cHandlesAllocated)
822	rc = rtPollSetGrow(pThis, pThis->cHandlesAllocated + 32);
823	if (RT_SUCCESS(rc))
824	{
825	/*
826	* Add the handles to the two parallel arrays.
827	*/
828	#ifdef RT_OS_WINDOWS
829	pThis->pahNative[i] = (HANDLE)hNative;
830	#elif defined(RT_OS_OS2)
831	pThis->pahNative[i] = hNative;
832	#else
833	pThis->paPollFds[i].fd = (int)hNative;
834	pThis->paPollFds[i].revents = 0;
835	pThis->paPollFds[i].events = 0;
836	if (fEvents & RTPOLL_EVT_READ)
837	pThis->paPollFds[i].events \|= POLLIN;
838	if (fEvents & RTPOLL_EVT_WRITE)
839	pThis->paPollFds[i].events \|= POLLOUT;
840	if (fEvents & RTPOLL_EVT_ERROR)
841	pThis->paPollFds[i].events \|= POLLERR;
842	#endif
843	pThis->paHandles[i].enmType = pHandle->enmType;
844	pThis->paHandles[i].u = uh;
845	pThis->paHandles[i].id = id;
846	pThis->paHandles[i].fEvents = fEvents;
847	pThis->paHandles[i].fFinalEntry = true;
848
849	if (iPrev != UINT32_MAX)
850	{
851	Assert(pThis->paHandles[iPrev].fFinalEntry);
852	pThis->paHandles[iPrev].fFinalEntry = false;
853	}
854
855	/*
856	* Validations and OS specific updates.
857	*/
858	#ifdef RT_OS_WINDOWS
859	/* none */
860	#elif defined(RT_OS_OS2)
861	rc = rtPollSetOs2Add(pThis, i, fEvents);
862	#else /* POSIX */
863	if (poll(&pThis->paPollFds[i], 1, 0) < 0)
864	{
865	rc = RTErrConvertFromErrno(errno);
866	pThis->paPollFds[i].fd = -1;
867	}
868	#endif /* POSIX */
869
870	if (RT_SUCCESS(rc))
871	{
872	/*
873	* Commit it to the set.
874	*/
875	pThis->cHandles++; Assert(pThis->cHandles == i + 1);
876	rc = VINF_SUCCESS;
877	}
878	}
879	}
880
881	ASMAtomicWriteBool(&pThis->fBusy, false);
882	return rc;
883	}
884
885
886	RTDECL(int) RTPollSetRemove(RTPOLLSET hPollSet, uint32_t id)
887	{
888	/*
889	* Validate the input.
890	*/
891	RTPOLLSETINTERNAL *pThis = hPollSet;
892	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
893	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
894	AssertReturn(id != UINT32_MAX, VERR_INVALID_PARAMETER);
895
896	/*
897	* Set the busy flag and do the job.
898	*/
899	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
900
901	int rc = VERR_POLL_HANDLE_ID_NOT_FOUND;
902	uint32_t i = pThis->cHandles;
903	while (i-- > 0)
904	if (pThis->paHandles[i].id == id)
905	{
906	/* Save some details for the duplicate searching. */
907	bool const fFinalEntry = pThis->paHandles[i].fFinalEntry;
908	RTHANDLETYPE const enmType = pThis->paHandles[i].enmType;
909	RTHANDLEUNION const uh = pThis->paHandles[i].u;
910	#ifdef RT_OS_OS2
911	uint32_t fRemovedEvents = pThis->paHandles[i].fEvents;
912	RTHCINTPTR const hNative = pThis->pahNative[i];
913	#endif
914
915	/* Remove the entry. */
916	pThis->cHandles--;
917	size_t const cToMove = pThis->cHandles - i;
918	if (cToMove)
919	{
920	memmove(&pThis->paHandles[i], &pThis->paHandles[i + 1], cToMove * sizeof(pThis->paHandles[i]));
921	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
922	memmove(&pThis->pahNative[i], &pThis->pahNative[i + 1], cToMove * sizeof(pThis->pahNative[i]));
923	#else
924	memmove(&pThis->paPollFds[i], &pThis->paPollFds[i + 1], cToMove * sizeof(pThis->paPollFds[i]));
925	#endif
926	}
927
928	/* Check for duplicate and set the fFinalEntry flag. */
929	if (fFinalEntry)
930	while (i-- > 0)
931	if ( pThis->paHandles[i].u.uInt == uh.uInt
932	&& pThis->paHandles[i].enmType == enmType)
933	{
934	Assert(!pThis->paHandles[i].fFinalEntry);
935	pThis->paHandles[i].fFinalEntry = true;
936	break;
937	}
938
939	#ifdef RT_OS_OS2
940	/*
941	* Update OS/2 wait structures.
942	*/
943	uint32_t fNewEvents = 0;
944	i = pThis->cHandles;
945	while (i-- > 0)
946	if ( pThis->paHandles[i].u.uInt == uh.uInt
947	&& pThis->paHandles[i].enmType == enmType)
948	fNewEvents \|= pThis->paHandles[i].fEvents;
949	if (enmType == RTHANDLETYPE_PIPE)
950	{
951	pThis->cPipes--;
952	if (fNewEvents == 0)
953	{
954	APIRET orc = DosDeleteMuxWaitSem(pThis->hmux, (HSEM)hNative);
955	AssertMsg(orc == NO_ERROR, ("%d\n", orc));
956	}
957	}
958	else if ( fNewEvents != (fNewEvents \| fRemovedEvents)
959	&& enmType == RTHANDLETYPE_SOCKET)
960	{
961	fRemovedEvents = fNewEvents ^ (fNewEvents \| fRemovedEvents);
962	if (fRemovedEvents & RTPOLL_EVT_ERROR)
963	rtPollSetOs2RemoveSocket(pThis, pThis->cReadSockets + pThis->cWriteSockets, &pThis->cXcptSockets, (int)hNative);
964	if (fRemovedEvents & RTPOLL_EVT_WRITE)
965	rtPollSetOs2RemoveSocket(pThis, pThis->cReadSockets, &pThis->cWriteSockets, (int)hNative);
966	if (fRemovedEvents & RTPOLL_EVT_READ)
967	rtPollSetOs2RemoveSocket(pThis, 0, &pThis->cReadSockets, (int)hNative);
968	}
969	#endif /* RT_OS_OS2 */
970	rc = VINF_SUCCESS;
971	break;
972	}
973
974	ASMAtomicWriteBool(&pThis->fBusy, false);
975	return rc;
976	}
977
978
979	RTDECL(int) RTPollSetQueryHandle(RTPOLLSET hPollSet, uint32_t id, PRTHANDLE pHandle)
980	{
981	/*
982	* Validate the input.
983	*/
984	RTPOLLSETINTERNAL *pThis = hPollSet;
985	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
986	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
987	AssertReturn(id != UINT32_MAX, VERR_INVALID_PARAMETER);
988	AssertPtrNullReturn(pHandle, VERR_INVALID_POINTER);
989
990	/*
991	* Set the busy flag and do the job.
992	*/
993	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
994
995	int rc = VERR_POLL_HANDLE_ID_NOT_FOUND;
996	uint32_t i = pThis->cHandles;
997	while (i-- > 0)
998	if (pThis->paHandles[i].id == id)
999	{
1000	if (pHandle)
1001	{
1002	pHandle->enmType = pThis->paHandles[i].enmType;
1003	pHandle->u = pThis->paHandles[i].u;
1004	}
1005	rc = VINF_SUCCESS;
1006	break;
1007	}
1008
1009	ASMAtomicWriteBool(&pThis->fBusy, false);
1010	return rc;
1011	}
1012
1013
1014	RTDECL(uint32_t) RTPollSetGetCount(RTPOLLSET hPollSet)
1015	{
1016	/*
1017	* Validate the input.
1018	*/
1019	RTPOLLSETINTERNAL *pThis = hPollSet;
1020	AssertPtrReturn(pThis, UINT32_MAX);
1021	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, UINT32_MAX);
1022
1023	/*
1024	* Set the busy flag and do the job.
1025	*/
1026	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), UINT32_MAX);
1027	uint32_t cHandles = pThis->cHandles;
1028	ASMAtomicWriteBool(&pThis->fBusy, false);
1029
1030	return cHandles;
1031	}
1032
1033	RTDECL(int) RTPollSetEventsChange(RTPOLLSET hPollSet, uint32_t id, uint32_t fEvents)
1034	{
1035	/*
1036	* Validate the input.
1037	*/
1038	RTPOLLSETINTERNAL *pThis = hPollSet;
1039	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1040	AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
1041	AssertReturn(id != UINT32_MAX, VERR_INVALID_PARAMETER);
1042	AssertReturn(!(fEvents & ~RTPOLL_EVT_VALID_MASK), VERR_INVALID_PARAMETER);
1043	AssertReturn(fEvents, VERR_INVALID_PARAMETER);
1044
1045	/*
1046	* Set the busy flag and do the job.
1047	*/
1048	AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true, false), VERR_CONCURRENT_ACCESS);
1049
1050	int rc = VERR_POLL_HANDLE_ID_NOT_FOUND;
1051	uint32_t i = pThis->cHandles;
1052	while (i-- > 0)
1053	if (pThis->paHandles[i].id == id)
1054	{
1055	if (pThis->paHandles[i].fEvents != fEvents)
1056	{
1057	#if defined(RT_OS_WINDOWS)
1058	/nothing/
1059	#elif defined(RT_OS_OS2)
1060	if (pThis->paHandles[i].enmType == RTHANDLETYPE_SOCKET)
1061	{
1062	uint32_t fOldEvents = 0;
1063	uint32_t j = pThis->cHandles;
1064	while (j-- > 0)
1065	if ( pThis->paHandles[j].enmType == RTHANDLETYPE_SOCKET
1066	&& pThis->paHandles[j].u.uInt == pThis->paHandles[i].u.uInt
1067	&& j != i)
1068	fOldEvents \|= pThis->paHandles[j].fEvents;
1069	uint32_t fNewEvents = fOldEvents \| fEvents;
1070	fOldEvents \|= pThis->paHandles[i].fEvents;
1071	if (fOldEvents != fEvents)
1072	{
1073	int const fdSocket = pThis->pahNative[i];
1074	uint32_t const fChangedEvents = fOldEvents ^ fNewEvents;
1075
1076	if ((fChangedEvents & RTPOLL_EVT_READ) && (fNewEvents & RTPOLL_EVT_READ))
1077	rtPollSetOs2AddSocket(pThis, pThis->cReadSockets, &pThis->cReadSockets, fdSocket);
1078	else if (fChangedEvents & RTPOLL_EVT_READ)
1079	rtPollSetOs2RemoveSocket(pThis, 0, &pThis->cReadSockets, fdSocket);
1080
1081	if ((fChangedEvents & RTPOLL_EVT_WRITE) && (fNewEvents & RTPOLL_EVT_WRITE))
1082	rtPollSetOs2AddSocket(pThis, pThis->cReadSockets + pThis->cWriteSockets,
1083	&pThis->cWriteSockets, fdSocket);
1084	else if (fChangedEvents & RTPOLL_EVT_WRITE)
1085	rtPollSetOs2RemoveSocket(pThis, pThis->cReadSockets, &pThis->cWriteSockets, fdSocket);
1086
1087	if ((fChangedEvents & RTPOLL_EVT_ERROR) && (fNewEvents & RTPOLL_EVT_ERROR))
1088	rtPollSetOs2AddSocket(pThis, pThis->cReadSockets + pThis->cWriteSockets + pThis->cXcptSockets,
1089	&pThis->cXcptSockets, fdSocket);
1090	else if (fChangedEvents & RTPOLL_EVT_ERROR)
1091	rtPollSetOs2RemoveSocket(pThis, pThis->cReadSockets + pThis->cWriteSockets, &pThis->cXcptSockets,
1092	fdSocket);
1093	}
1094	}
1095	#else
1096	pThis->paPollFds[i].events = 0;
1097	if (fEvents & RTPOLL_EVT_READ)
1098	pThis->paPollFds[i].events \|= POLLIN;
1099	if (fEvents & RTPOLL_EVT_WRITE)
1100	pThis->paPollFds[i].events \|= POLLOUT;
1101	if (fEvents & RTPOLL_EVT_ERROR)
1102	pThis->paPollFds[i].events \|= POLLERR;
1103	#endif
1104	pThis->paHandles[i].fEvents = fEvents;
1105	}
1106	rc = VINF_SUCCESS;
1107	break;
1108	}
1109
1110	ASMAtomicWriteBool(&pThis->fBusy, false);
1111	return rc;
1112	}
1113

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source: vbox/trunk/src/VBox/Runtime/r3/poll.cpp@ 76553

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