DrvHostSerial.cpp@ 17802

Last change on this file since 17802 was 16527, checked in by vboxsync, 16 years ago
Linux HostSerial: typo
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1	/* $Id: DrvHostSerial.cpp 16527 2009-02-05 13:44:51Z vboxsync $ */
2	/** @file
3	* VBox stream I/O devices: Host serial driver
4	*
5	* Contributed by: Alexander Eichner
6	*/
7
8	/*
9	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*
19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
20	* Clara, CA 95054 USA or visit http://www.sun.com if you need
21	* additional information or have any questions.
22	*/
23
24
25
26	/*******************************************************************************
27	* Header Files *
28	*******************************************************************************/
29	#define LOG_GROUP LOG_GROUP_DRV_HOST_SERIAL
30	#include <VBox/pdm.h>
31	#include <VBox/err.h>
32
33	#include <VBox/log.h>
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/semaphore.h>
37	#include <iprt/file.h>
38	#include <iprt/alloc.h>
39
40	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
41	# include <errno.h>
42	# ifdef RT_OS_SOLARIS
43	# include <sys/termios.h>
44	# else
45	# include <termios.h>
46	# endif
47	# include <sys/types.h>
48	# include <fcntl.h>
49	# include <string.h>
50	# include <unistd.h>
51	# ifdef RT_OS_DARWIN
52	# include <sys/select.h>
53	# else
54	# include <sys/poll.h>
55	# endif
56	# include <sys/ioctl.h>
57	# include <pthread.h>
58
59	# ifdef RT_OS_LINUX
60	/*
61	* TIOCM_LOOP is not defined in the above header files for some reason but in asm/termios.h.
62	* But inclusion of this file however leads to compilation errors because of redefinition of some
63	* structs. Thatswhy it is defined here until a better solution is found.
64	*/
65	# ifndef TIOCM_LOOP
66	# define TIOCM_LOOP 0x8000
67	# endif
68	# endif /* linux */
69
70	#elif defined(RT_OS_WINDOWS)
71	# include <Windows.h>
72	#endif
73
74	#include "../Builtins.h"
75
76
77	/** Size of the send fifo queue (in bytes) */
78	#ifdef RT_OS_DARWIN
79	/** @todo This is really desperate, but it seriously looks like
80	* the data is arriving way too fast for us to push over. 9600
81	* baud and zoc reports sending at 12000+ chars/sec... */
82	# define CHAR_MAX_SEND_QUEUE 0x400
83	# define CHAR_MAX_SEND_QUEUE_MASK 0x3ff
84	#else
85	# define CHAR_MAX_SEND_QUEUE 0x80
86	# define CHAR_MAX_SEND_QUEUE_MASK 0x7f
87	#endif
88
89	/*******************************************************************************
90	* Structures and Typedefs *
91	*******************************************************************************/
92
93	/**
94	* Char driver instance data.
95	*/
96	typedef struct DRVHOSTSERIAL
97	{
98	/** Pointer to the driver instance structure. */
99	PPDMDRVINS pDrvIns;
100	/** Pointer to the char port interface of the driver/device above us. */
101	PPDMICHARPORT pDrvCharPort;
102	/** Our char interface. */
103	PDMICHAR IChar;
104	/** Receive thread. */
105	PPDMTHREAD pRecvThread;
106	/** Send thread. */
107	PPDMTHREAD pSendThread;
108	/** Status lines monitor thread. */
109	PPDMTHREAD pMonitorThread;
110	/** Send event semephore */
111	RTSEMEVENT SendSem;
112
113	/** the device path */
114	char *pszDevicePath;
115
116	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
117	/** the device handle */
118	RTFILE DeviceFile;
119	# ifdef RT_OS_DARWIN
120	/** The device handle used for reading.
121	* Used to prevent the read selecto from blocking the writes. */
122	RTFILE DeviceFileR;
123	# endif
124	/** The read end of the control pipe */
125	RTFILE WakeupPipeR;
126	/** The write end of the control pipe */
127	RTFILE WakeupPipeW;
128	# ifndef RT_OS_LINUX
129	/** The current line status.
130	* Used by the polling version of drvHostSerialMonitorThread. */
131	int fStatusLines;
132	# endif
133	#elif defined(RT_OS_WINDOWS)
134	/** the device handle */
135	HANDLE hDeviceFile;
136	/** The event semaphore for waking up the receive thread */
137	HANDLE hHaltEventSem;
138	/** The event semaphore for overlapped receiving */
139	HANDLE hEventRecv;
140	/** For overlapped receiving */
141	OVERLAPPED overlappedRecv;
142	/** The event semaphore for overlapped sending */
143	HANDLE hEventSend;
144	/** For overlapped sending */
145	OVERLAPPED overlappedSend;
146	#endif
147
148	/** Internal send FIFO queue */
149	uint8_t volatile aSendQueue[CHAR_MAX_SEND_QUEUE];
150	uint32_t volatile iSendQueueHead;
151	uint32_t volatile iSendQueueTail;
152
153	/** Read/write statistics */
154	STAMCOUNTER StatBytesRead;
155	STAMCOUNTER StatBytesWritten;
156	#ifdef RT_OS_DARWIN
157	/** The number of bytes we've dropped because the send queue
158	* was full. */
159	STAMCOUNTER StatSendOverflows;
160	#endif
161	} DRVHOSTSERIAL, *PDRVHOSTSERIAL;
162
163
164	/** Converts a pointer to DRVCHAR::IChar to a PDRVHOSTSERIAL. */
165	#define PDMICHAR_2_DRVHOSTSERIAL(pInterface) ( (PDRVHOSTSERIAL)((uintptr_t)pInterface - RT_OFFSETOF(DRVHOSTSERIAL, IChar)) )
166
167
168	/* -=-=-=-=- IBase -=-=-=-=- */
169
170	/**
171	* Queries an interface to the driver.
172	*
173	* @returns Pointer to interface.
174	* @returns NULL if the interface was not supported by the driver.
175	* @param pInterface Pointer to this interface structure.
176	* @param enmInterface The requested interface identification.
177	*/
178	static DECLCALLBACK(void *) drvHostSerialQueryInterface(PPDMIBASE pInterface, PDMINTERFACE enmInterface)
179	{
180	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
181	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
182	switch (enmInterface)
183	{
184	case PDMINTERFACE_BASE:
185	return &pDrvIns->IBase;
186	case PDMINTERFACE_CHAR:
187	return &pThis->IChar;
188	default:
189	return NULL;
190	}
191	}
192
193
194	/* -=-=-=-=- IChar -=-=-=-=- */
195
196	/** @copydoc PDMICHAR::pfnWrite */
197	static DECLCALLBACK(int) drvHostSerialWrite(PPDMICHAR pInterface, const void *pvBuf, size_t cbWrite)
198	{
199	PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
200	const uint8_t pbBuffer = (const uint8_t )pvBuf;
201
202	LogFlow(("%s: pvBuf=%#p cbWrite=%d\n", __FUNCTION__, pvBuf, cbWrite));
203
204	for (uint32_t i = 0; i < cbWrite; i++)
205	{
206	#ifdef RT_OS_DARWIN /* don't wanna break the others here. */
207	uint32_t iHead = ASMAtomicUoReadU32(&pThis->iSendQueueHead);
208	uint32_t iTail = ASMAtomicUoReadU32(&pThis->iSendQueueTail);
209	int32_t cbAvail = iTail > iHead
210	? iTail - iHead - 1
211	: CHAR_MAX_SEND_QUEUE - (iHead - iTail) - 1;
212	if (cbAvail <= 0)
213	{
214	#ifdef DEBUG
215	uint64_t volatile u64Now = RTTimeNanoTS(); NOREF(u64Now);
216	#endif
217	Log(("%s: dropping %d chars (cbAvail=%d iHead=%d iTail=%d)\n", __FUNCTION__, cbWrite - i , cbAvail, iHead, iTail));
218	STAM_COUNTER_INC(&pThis->StatSendOverflows);
219	break;
220	}
221
222	pThis->aSendQueue[iHead] = pbBuffer[i];
223	STAM_COUNTER_INC(&pThis->StatBytesWritten);
224	ASMAtomicWriteU32(&pThis->iSendQueueHead, (iHead + 1) & CHAR_MAX_SEND_QUEUE_MASK);
225	if (cbAvail < CHAR_MAX_SEND_QUEUE / 4)
226	{
227	RTSemEventSignal(pThis->SendSem);
228	RTThreadYield();
229	}
230	#else /* old code */
231	uint32_t idx = ASMAtomicUoReadU32(&pThis->iSendQueueHead);
232
233	pThis->aSendQueue[idx] = pbBuffer[i];
234	idx = (idx + 1) & CHAR_MAX_SEND_QUEUE_MASK;
235
236	STAM_COUNTER_INC(&pThis->StatBytesWritten);
237	ASMAtomicWriteU32(&pThis->iSendQueueHead, idx);
238	#endif /* old code */
239	}
240	RTSemEventSignal(pThis->SendSem);
241	return VINF_SUCCESS;
242	}
243
244	static DECLCALLBACK(int) drvHostSerialSetParameters(PPDMICHAR pInterface, unsigned Bps, char chParity, unsigned cDataBits, unsigned cStopBits)
245	{
246	PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
247	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
248	struct termios *termiosSetup;
249	int baud_rate;
250	#elif defined(RT_OS_WINDOWS)
251	LPDCB comSetup;
252	#endif
253
254	LogFlow(("%s: Bps=%u chParity=%c cDataBits=%u cStopBits=%u\n", __FUNCTION__, Bps, chParity, cDataBits, cStopBits));
255
256	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
257	termiosSetup = (struct termios *)RTMemTmpAllocZ(sizeof(struct termios));
258
259	/* Enable receiver */
260	termiosSetup->c_cflag \|= (CLOCAL \| CREAD);
261
262	switch (Bps) {
263	case 50:
264	baud_rate = B50;
265	break;
266	case 75:
267	baud_rate = B75;
268	break;
269	case 110:
270	baud_rate = B110;
271	break;
272	case 134:
273	baud_rate = B134;
274	break;
275	case 150:
276	baud_rate = B150;
277	break;
278	case 200:
279	baud_rate = B200;
280	break;
281	case 300:
282	baud_rate = B300;
283	break;
284	case 600:
285	baud_rate = B600;
286	break;
287	case 1200:
288	baud_rate = B1200;
289	break;
290	case 1800:
291	baud_rate = B1800;
292	break;
293	case 2400:
294	baud_rate = B2400;
295	break;
296	case 4800:
297	baud_rate = B4800;
298	break;
299	case 9600:
300	baud_rate = B9600;
301	break;
302	case 19200:
303	baud_rate = B19200;
304	break;
305	case 38400:
306	baud_rate = B38400;
307	break;
308	case 57600:
309	baud_rate = B57600;
310	break;
311	case 115200:
312	baud_rate = B115200;
313	break;
314	default:
315	baud_rate = B9600;
316	}
317
318	cfsetispeed(termiosSetup, baud_rate);
319	cfsetospeed(termiosSetup, baud_rate);
320
321	switch (chParity) {
322	case 'E':
323	termiosSetup->c_cflag \|= PARENB;
324	break;
325	case 'O':
326	termiosSetup->c_cflag \|= (PARENB \| PARODD);
327	break;
328	case 'N':
329	break;
330	default:
331	break;
332	}
333
334	switch (cDataBits) {
335	case 5:
336	termiosSetup->c_cflag \|= CS5;
337	break;
338	case 6:
339	termiosSetup->c_cflag \|= CS6;
340	break;
341	case 7:
342	termiosSetup->c_cflag \|= CS7;
343	break;
344	case 8:
345	termiosSetup->c_cflag \|= CS8;
346	break;
347	default:
348	break;
349	}
350
351	switch (cStopBits) {
352	case 2:
353	termiosSetup->c_cflag \|= CSTOPB;
354	default:
355	break;
356	}
357
358	/* set serial port to raw input */
359	termiosSetup->c_lflag = ~(ICANON \| ECHO \| ECHOE \| ISIG);
360
361	tcsetattr(pThis->DeviceFile, TCSANOW, termiosSetup);
362	RTMemTmpFree(termiosSetup);
363	#elif defined(RT_OS_WINDOWS)
364	comSetup = (LPDCB)RTMemTmpAllocZ(sizeof(DCB));
365
366	comSetup->DCBlength = sizeof(DCB);
367
368	switch (Bps) {
369	case 110:
370	comSetup->BaudRate = CBR_110;
371	break;
372	case 300:
373	comSetup->BaudRate = CBR_300;
374	break;
375	case 600:
376	comSetup->BaudRate = CBR_600;
377	break;
378	case 1200:
379	comSetup->BaudRate = CBR_1200;
380	break;
381	case 2400:
382	comSetup->BaudRate = CBR_2400;
383	break;
384	case 4800:
385	comSetup->BaudRate = CBR_4800;
386	break;
387	case 9600:
388	comSetup->BaudRate = CBR_9600;
389	break;
390	case 14400:
391	comSetup->BaudRate = CBR_14400;
392	break;
393	case 19200:
394	comSetup->BaudRate = CBR_19200;
395	break;
396	case 38400:
397	comSetup->BaudRate = CBR_38400;
398	break;
399	case 57600:
400	comSetup->BaudRate = CBR_57600;
401	break;
402	case 115200:
403	comSetup->BaudRate = CBR_115200;
404	break;
405	default:
406	comSetup->BaudRate = CBR_9600;
407	}
408
409	comSetup->fBinary = TRUE;
410	comSetup->fOutxCtsFlow = FALSE;
411	comSetup->fOutxDsrFlow = FALSE;
412	comSetup->fDtrControl = DTR_CONTROL_DISABLE;
413	comSetup->fDsrSensitivity = FALSE;
414	comSetup->fTXContinueOnXoff = TRUE;
415	comSetup->fOutX = FALSE;
416	comSetup->fInX = FALSE;
417	comSetup->fErrorChar = FALSE;
418	comSetup->fNull = FALSE;
419	comSetup->fRtsControl = RTS_CONTROL_DISABLE;
420	comSetup->fAbortOnError = FALSE;
421	comSetup->wReserved = 0;
422	comSetup->XonLim = 5;
423	comSetup->XoffLim = 5;
424	comSetup->ByteSize = cDataBits;
425
426	switch (chParity) {
427	case 'E':
428	comSetup->Parity = EVENPARITY;
429	break;
430	case 'O':
431	comSetup->Parity = ODDPARITY;
432	break;
433	case 'N':
434	comSetup->Parity = NOPARITY;
435	break;
436	default:
437	break;
438	}
439
440	switch (cStopBits) {
441	case 1:
442	comSetup->StopBits = ONESTOPBIT;
443	break;
444	case 2:
445	comSetup->StopBits = TWOSTOPBITS;
446	break;
447	default:
448	break;
449	}
450
451	comSetup->XonChar = 0;
452	comSetup->XoffChar = 0;
453	comSetup->ErrorChar = 0;
454	comSetup->EofChar = 0;
455	comSetup->EvtChar = 0;
456
457	SetCommState(pThis->hDeviceFile, comSetup);
458	RTMemTmpFree(comSetup);
459	#endif /* RT_OS_WINDOWS */
460
461	return VINF_SUCCESS;
462	}
463
464	/* -=-=-=-=- receive thread -=-=-=-=- */
465
466	/**
467	* Send thread loop.
468	*
469	* @returns VINF_SUCCESS.
470	* @param ThreadSelf Thread handle to this thread.
471	* @param pvUser User argument.
472	*/
473	static DECLCALLBACK(int) drvHostSerialSendThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
474	{
475	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
476
477	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
478	return VINF_SUCCESS;
479
480	#ifdef RT_OS_WINDOWS
481	/* Make sure that the halt event semaphore is reset. */
482	DWORD dwRet = WaitForSingleObject(pThis->hHaltEventSem, 0);
483
484	HANDLE haWait[2];
485	haWait[0] = pThis->hEventSend;
486	haWait[1] = pThis->hHaltEventSem;
487	#endif
488
489	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
490	{
491	int rc = RTSemEventWait(pThis->SendSem, RT_INDEFINITE_WAIT);
492	if (RT_FAILURE(rc))
493	break;
494
495	/*
496	* Write the character to the host device.
497	*/
498	#ifdef RT_OS_DARWIN
499	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
500	{
501	/* copy the send queue so we get a linear buffer with the maximal size. */
502	uint8_t abBuf[sizeof(pThis->aSendQueue)];
503	uint32_t cb = 0;
504	uint32_t iTail = ASMAtomicUoReadU32(&pThis->iSendQueueTail);
505	uint32_t iHead = ASMAtomicUoReadU32(&pThis->iSendQueueHead);
506	if (iTail == iHead)
507	break;
508	do
509	{
510	abBuf[cb++] = pThis->aSendQueue[iTail];
511	iTail = (iTail + 1) & CHAR_MAX_SEND_QUEUE_MASK;
512	} while (iTail != iHead);
513
514	ASMAtomicWriteU32(&pThis->iSendQueueTail, iTail);
515
516	/* write it. */
517	#ifdef DEBUG
518	uint64_t volatile u64Now = RTTimeNanoTS(); NOREF(u64Now);
519	#endif
520	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
521
522	size_t cbWritten;
523	rc = RTFileWrite(pThis->DeviceFile, abBuf, cb, &cbWritten);
524	if (rc == VERR_TRY_AGAIN)
525	cbWritten = 0;
526	if (cbWritten < cb && (RT_SUCCESS(rc) \|\| rc == VERR_TRY_AGAIN))
527	{
528	/* ok, block till the device is ready for more (O_NONBLOCK) effect. */
529	rc = VINF_SUCCESS;
530	uint8_t const *pbSrc = &abBuf[0];
531	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
532	{
533	/* advance */
534	cb -= cbWritten;
535	pbSrc += cbWritten;
536
537	/* wait */
538	fd_set WrSet;
539	FD_ZERO(&WrSet);
540	FD_SET(pThis->DeviceFile, &WrSet);
541	fd_set XcptSet;
542	FD_ZERO(&XcptSet);
543	FD_SET(pThis->DeviceFile, &XcptSet);
544	rc = select(pThis->DeviceFile + 1, NULL, &WrSet, &XcptSet, NULL);
545	/** @todo check rc? */
546
547	/* try write more */
548	rc = RTFileWrite(pThis->DeviceFile, pbSrc, cb, &cbWritten);
549	if (rc == VERR_TRY_AGAIN)
550	cbWritten = 0;
551	else if (RT_FAILURE(rc))
552	break;
553	else if (cbWritten >= cb)
554	break;
555	rc = VINF_SUCCESS;
556	} /* wait/write loop */
557	}
558
559	#elif defined(RT_OS_WINDOWS)
560	/* perform an overlapped write operation. */
561	DWORD cbWritten;
562	memset(&pThis->overlappedSend, 0, sizeof(pThis->overlappedSend));
563	pThis->overlappedSend.hEvent = pThis->hEventSend;
564	if (!WriteFile(pThis->hDeviceFile, abBuf, cb, &cbWritten, &pThis->overlappedSend))
565	{
566	dwRet = GetLastError();
567	if (dwRet == ERROR_IO_PENDING)
568	{
569	/*
570	* write blocked, wait for completion or wakeup...
571	*/
572	dwRet = WaitForMultipleObjects(2, haWait, FALSE, INFINITE);
573	if (dwRet != WAIT_OBJECT_0)
574	{
575	AssertMsg(pThread->enmState != PDMTHREADSTATE_RUNNING, ("The halt event sempahore is set but the thread is still in running state\n"));
576	break;
577	}
578	}
579	else
580	rc = RTErrConvertFromWin32(dwRet);
581	}
582
583	#endif /* RT_OS_WINDOWS */
584	if (RT_FAILURE(rc))
585	{
586	LogRel(("HostSerial#%d: Serial Write failed with %Rrc; terminating send thread\n", pDrvIns->iInstance, rc));
587	return rc;
588	}
589	} /* write loop */
590
591	#else /* old code */
592	uint32_t iTail;
593	while ( pThread->enmState == PDMTHREADSTATE_RUNNING
594	&& (iTail = ASMAtomicUoReadU32(&pThis->iSendQueueTail)) != ASMAtomicUoReadU32(&pThis->iSendQueueHead))
595	{
596	/** @todo process more than one byte? */
597	unsigned cbProcessed = 1;
598	uint8_t abBuf[1];
599	abBuf[0] = pThis->aSendQueue[iTail];
600
601	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
602
603	rc = RTFileWrite(pThis->DeviceFile, abBuf, cbProcessed, NULL);
604
605	#elif defined(RT_OS_WINDOWS)
606
607	DWORD cbBytesWritten;
608	memset(&pThis->overlappedSend, 0, sizeof(pThis->overlappedSend));
609	pThis->overlappedSend.hEvent = pThis->hEventSend;
610
611	if (!WriteFile(pThis->hDeviceFile, abBuf, cbProcessed, &cbBytesWritten, &pThis->overlappedSend))
612	{
613	dwRet = GetLastError();
614	if (dwRet == ERROR_IO_PENDING)
615	{
616	/*
617	* write blocked, wait ...
618	*/
619	dwRet = WaitForMultipleObjects(2, haWait, FALSE, INFINITE);
620	if (dwRet != WAIT_OBJECT_0)
621	{
622	AssertMsg(pThread->enmState != PDMTHREADSTATE_RUNNING, ("The halt event sempahore is set but the thread is still in running state\n"));
623	break;
624	}
625	}
626	else
627	rc = RTErrConvertFromWin32(dwRet);
628	}
629
630	#endif
631
632	if (RT_SUCCESS(rc))
633	{
634	Assert(cbProcessed == 1);
635	ASMAtomicWriteU32(&pThis->iSendQueueTail, (iTail + 1) & CHAR_MAX_SEND_QUEUE_MASK);
636	}
637	else if (RT_FAILURE(rc))
638	{
639	LogRel(("HostSerial#%d: Serial Write failed with %Rrc; terminating send thread\n", pDrvIns->iInstance, rc));
640	return rc;
641	}
642	}
643	#endif /* old code */
644	}
645
646	return VINF_SUCCESS;
647	}
648
649	/**
650	* Unblock the send thread so it can respond to a state change.
651	*
652	* @returns a VBox status code.
653	* @param pDrvIns The driver instance.
654	* @param pThread The send thread.
655	*/
656	static DECLCALLBACK(int) drvHostSerialWakeupSendThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
657	{
658	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
659	int rc;
660
661	rc = RTSemEventSignal(pThis->SendSem);
662	if (RT_FAILURE(rc))
663	return rc;
664
665	#ifdef RT_OS_WINDOWS
666	if (!SetEvent(pThis->hHaltEventSem))
667	return RTErrConvertFromWin32(GetLastError());
668	#endif
669
670	return VINF_SUCCESS;
671	}
672
673	/* -=-=-=-=- receive thread -=-=-=-=- */
674
675	/**
676	* Receive thread loop.
677	*
678	* This thread pushes data from the host serial device up the driver
679	* chain toward the serial device.
680	*
681	* @returns VINF_SUCCESS.
682	* @param ThreadSelf Thread handle to this thread.
683	* @param pvUser User argument.
684	*/
685	static DECLCALLBACK(int) drvHostSerialRecvThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
686	{
687	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
688	uint8_t abBuffer[256];
689	uint8_t *pbBuffer = NULL;
690	size_t cbRemaining = 0; /* start by reading host data */
691	int rc = VINF_SUCCESS;
692	int rcThread = VINF_SUCCESS;
693
694	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
695	return VINF_SUCCESS;
696
697	#ifdef RT_OS_WINDOWS
698	/* Make sure that the halt event semaphore is reset. */
699	DWORD dwRet = WaitForSingleObject(pThis->hHaltEventSem, 0);
700
701	HANDLE ahWait[2];
702	ahWait[0] = pThis->hEventRecv;
703	ahWait[1] = pThis->hHaltEventSem;
704	#endif
705
706	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
707	{
708	if (!cbRemaining)
709	{
710	/* Get a block of data from the host serial device. */
711
712	#if defined(RT_OS_DARWIN) /* poll is broken on x86 darwin, returns POLLNVAL. */
713	fd_set RdSet;
714	FD_ZERO(&RdSet);
715	FD_SET(pThis->DeviceFileR, &RdSet);
716	FD_SET(pThis->WakeupPipeR, &RdSet);
717	fd_set XcptSet;
718	FD_ZERO(&XcptSet);
719	FD_SET(pThis->DeviceFileR, &XcptSet);
720	FD_SET(pThis->WakeupPipeR, &XcptSet);
721	# if 1 /* it seems like this select is blocking the write... */
722	rc = select(RT_MAX(pThis->WakeupPipeR, pThis->DeviceFileR) + 1, &RdSet, NULL, &XcptSet, NULL);
723	# else
724	struct timeval tv = { 0, 1000 };
725	rc = select(RT_MAX(pThis->WakeupPipeR, pThis->DeviceFileR) + 1, &RdSet, NULL, &XcptSet, &tv);
726	# endif
727	if (rc == -1)
728	{
729	int err = errno;
730	rcThread = RTErrConvertFromErrno(err);
731	LogRel(("HostSerial#%d: select failed with errno=%d / %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, err, rcThread));
732	break;
733	}
734
735	/* this might have changed in the meantime */
736	if (pThread->enmState != PDMTHREADSTATE_RUNNING)
737	break;
738	if (rc == 0)
739	continue;
740
741	/* drain the wakeup pipe */
742	size_t cbRead;
743	if ( FD_ISSET(pThis->WakeupPipeR, &RdSet)
744	\|\| FD_ISSET(pThis->WakeupPipeR, &XcptSet))
745	{
746	rc = RTFileRead(pThis->WakeupPipeR, abBuffer, 1, &cbRead);
747	if (RT_FAILURE(rc))
748	{
749	LogRel(("HostSerial#%d: draining the wakekup pipe failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
750	rcThread = rc;
751	break;
752	}
753	continue;
754	}
755
756	/* read data from the serial port. */
757	rc = RTFileRead(pThis->DeviceFileR, abBuffer, sizeof(abBuffer), &cbRead);
758	if (RT_FAILURE(rc))
759	{
760	LogRel(("HostSerial#%d: (1) Read failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
761	rcThread = rc;
762	break;
763	}
764	cbRemaining = cbRead;
765
766	#elif defined(RT_OS_LINUX) \|\| defined(RT_OS_SOLARIS)
767
768	size_t cbRead;
769	struct pollfd aFDs[2];
770	aFDs[0].fd = pThis->DeviceFile;
771	aFDs[0].events = POLLIN;
772	aFDs[0].revents = 0;
773	aFDs[1].fd = pThis->WakeupPipeR;
774	aFDs[1].events = POLLIN \| POLLERR \| POLLHUP;
775	aFDs[1].revents = 0;
776	rc = poll(aFDs, RT_ELEMENTS(aFDs), -1);
777	if (rc < 0)
778	{
779	int err = errno;
780	rcThread = RTErrConvertFromErrno(err);
781	LogRel(("HostSerial#%d: poll failed with errno=%d / %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, err, rcThread));
782	break;
783	}
784	/* this might have changed in the meantime */
785	if (pThread->enmState != PDMTHREADSTATE_RUNNING)
786	break;
787	if (rc > 0 && aFDs[1].revents)
788	{
789	if (aFDs[1].revents & (POLLHUP \| POLLERR \| POLLNVAL))
790	break;
791	/* notification to terminate -- drain the pipe */
792	RTFileRead(pThis->WakeupPipeR, &abBuffer, 1, &cbRead);
793	continue;
794	}
795	rc = RTFileRead(pThis->DeviceFile, abBuffer, sizeof(abBuffer), &cbRead);
796	if (RT_FAILURE(rc))
797	{
798	/* don't terminate worker thread when data unavailable */
799	if (rc == VERR_TRY_AGAIN)
800	continue;
801
802	LogRel(("HostSerial#%d: (2) Read failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
803	rcThread = rc;
804	break;
805	}
806	cbRemaining = cbRead;
807
808	#elif defined(RT_OS_WINDOWS)
809
810	DWORD dwEventMask = 0;
811	DWORD dwNumberOfBytesTransferred;
812
813	memset(&pThis->overlappedRecv, 0, sizeof(pThis->overlappedRecv));
814	pThis->overlappedRecv.hEvent = pThis->hEventRecv;
815
816	if (!WaitCommEvent(pThis->hDeviceFile, &dwEventMask, &pThis->overlappedRecv))
817	{
818	dwRet = GetLastError();
819	if (dwRet == ERROR_IO_PENDING)
820	{
821	dwRet = WaitForMultipleObjects(2, ahWait, FALSE, INFINITE);
822	if (dwRet != WAIT_OBJECT_0)
823	{
824	/* notification to terminate */
825	AssertMsg(pThread->enmState != PDMTHREADSTATE_RUNNING, ("The halt event sempahore is set but the thread is still in running state\n"));
826	break;
827	}
828	}
829	else
830	{
831	rcThread = RTErrConvertFromWin32(dwRet);
832	LogRel(("HostSerial#%d: Wait failed with error %Rrc; terminating the worker thread.\n", pDrvIns->iInstance, rcThread));
833	break;
834	}
835	}
836	/* this might have changed in the meantime */
837	if (pThread->enmState != PDMTHREADSTATE_RUNNING)
838	break;
839
840	/* Check the event */
841	if (dwEventMask & EV_RXCHAR)
842	{
843	if (!ReadFile(pThis->hDeviceFile, abBuffer, sizeof(abBuffer), &dwNumberOfBytesTransferred, &pThis->overlappedRecv))
844	{
845	rcThread = RTErrConvertFromWin32(GetLastError());
846	LogRel(("HostSerial#%d: Read failed with error %Rrc; terminating the worker thread.\n", pDrvIns->iInstance, rcThread));
847	break;
848	}
849	cbRemaining = dwNumberOfBytesTransferred;
850	}
851	else
852	{
853	/* The status lines have changed. Notify the device. */
854	DWORD dwNewStatusLinesState = 0;
855	uint32_t uNewStatusLinesState = 0;
856
857	/* Get the new state */
858	if (GetCommModemStatus(pThis->hDeviceFile, &dwNewStatusLinesState))
859	{
860	if (dwNewStatusLinesState & MS_RLSD_ON)
861	uNewStatusLinesState \|= PDM_ICHAR_STATUS_LINES_DCD;
862	if (dwNewStatusLinesState & MS_RING_ON)
863	uNewStatusLinesState \|= PDM_ICHAR_STATUS_LINES_RI;
864	if (dwNewStatusLinesState & MS_DSR_ON)
865	uNewStatusLinesState \|= PDM_ICHAR_STATUS_LINES_DSR;
866	if (dwNewStatusLinesState & MS_CTS_ON)
867	uNewStatusLinesState \|= PDM_ICHAR_STATUS_LINES_CTS;
868	rc = pThis->pDrvCharPort->pfnNotifyStatusLinesChanged(pThis->pDrvCharPort, uNewStatusLinesState);
869	if (RT_FAILURE(rc))
870	{
871	/* Notifying device failed, continue but log it */
872	LogRel(("HostSerial#%d: Notifying device failed with error %Rrc; continuing.\n", pDrvIns->iInstance, rc));
873	}
874	}
875	else
876	{
877	/* Getting new state failed, continue but log it */
878	LogRel(("HostSerial#%d: Getting status lines state failed with error %Rrc; continuing.\n", pDrvIns->iInstance, RTErrConvertFromWin32(GetLastError())));
879	}
880	}
881	#endif
882
883	Log(("Read %d bytes.\n", cbRemaining));
884	pbBuffer = abBuffer;
885	}
886	else
887	{
888	/* Send data to the guest. */
889	size_t cbProcessed = cbRemaining;
890	rc = pThis->pDrvCharPort->pfnNotifyRead(pThis->pDrvCharPort, pbBuffer, &cbProcessed);
891	if (RT_SUCCESS(rc))
892	{
893	Assert(cbProcessed); Assert(cbProcessed <= cbRemaining);
894	pbBuffer += cbProcessed;
895	cbRemaining -= cbProcessed;
896	STAM_COUNTER_ADD(&pThis->StatBytesRead, cbProcessed);
897	}
898	else if (rc == VERR_TIMEOUT)
899	{
900	/* Normal case, just means that the guest didn't accept a new
901	* character before the timeout elapsed. Just retry. */
902	rc = VINF_SUCCESS;
903	}
904	else
905	{
906	LogRel(("HostSerial#%d: NotifyRead failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
907	rcThread = rc;
908	break;
909	}
910	}
911	}
912
913	return rcThread;
914	}
915
916	/**
917	* Unblock the send thread so it can respond to a state change.
918	*
919	* @returns a VBox status code.
920	* @param pDrvIns The driver instance.
921	* @param pThread The send thread.
922	*/
923	static DECLCALLBACK(int) drvHostSerialWakeupRecvThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
924	{
925	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
926	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
927	return RTFileWrite(pThis->WakeupPipeW, "", 1, NULL);
928	#elif defined(RT_OS_WINDOWS)
929	if (!SetEvent(pThis->hHaltEventSem))
930	return RTErrConvertFromWin32(GetLastError());
931	return VINF_SUCCESS;
932	#else
933	# error adapt me!
934	#endif
935	}
936
937	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
938	/* -=-=-=-=- Monitor thread -=-=-=-=- */
939
940	/**
941	* Monitor thread loop.
942	*
943	* This thread monitors the status lines and notifies the device
944	* if they change.
945	*
946	* @returns VINF_SUCCESS.
947	* @param ThreadSelf Thread handle to this thread.
948	* @param pvUser User argument.
949	*/
950	static DECLCALLBACK(int) drvHostSerialMonitorThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
951	{
952	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
953	int rc = VINF_SUCCESS;
954	unsigned uStatusLinesToCheck = 0;
955
956	uStatusLinesToCheck = TIOCM_CAR \| TIOCM_RNG \| TIOCM_LE \| TIOCM_CTS;
957
958	if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
959	return VINF_SUCCESS;
960
961	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
962	{
963	uint32_t newStatusLine = 0;
964	unsigned int statusLines;
965
966	# ifdef RT_OS_LINUX
967	/*
968	* Wait for status line change.
969	*/
970	rc = ioctl(pThis->DeviceFile, TIOCMIWAIT, uStatusLinesToCheck);
971	if (pThread->enmState != PDMTHREADSTATE_RUNNING)
972	break;
973	if (rc < 0)
974	{
975	ioctl_error:
976	PDMDrvHlpVMSetRuntimeError(pDrvIns, false, "DrvHostSerialFail",
977	N_("Ioctl failed for serial host device '%s' (%Rrc). The device will not work properly"),
978	pThis->pszDevicePath, RTErrConvertFromErrno(errno));
979	break;
980	}
981
982	rc = ioctl(pThis->DeviceFile, TIOCMGET, &statusLines);
983	if (rc < 0)
984	goto ioctl_error;
985	# else /* !RT_OS_LINUX */
986	/*
987	* Poll for the status line change.
988	*/
989	rc = ioctl(pThis->DeviceFile, TIOCMGET, &statusLines);
990	if (rc < 0)
991	{
992	PDMDrvHlpVMSetRuntimeError(pDrvIns, false, "DrvHostSerialFail",
993	N_("Ioctl failed for serial host device '%s' (%Rrc). The device will not work properly"),
994	pThis->pszDevicePath, RTErrConvertFromErrno(errno));
995	break;
996	}
997	if (!((statusLines ^ pThis->fStatusLines) & uStatusLinesToCheck))
998	{
999	PDMR3ThreadSleep(pThread, 500); /* 0.5 sec */
1000	continue;
1001	}
1002	pThis->fStatusLines = statusLines;
1003	# endif /* !RT_OS_LINUX */
1004
1005	if (statusLines & TIOCM_CAR)
1006	newStatusLine \|= PDM_ICHAR_STATUS_LINES_DCD;
1007	if (statusLines & TIOCM_RNG)
1008	newStatusLine \|= PDM_ICHAR_STATUS_LINES_RI;
1009	if (statusLines & TIOCM_LE)
1010	newStatusLine \|= PDM_ICHAR_STATUS_LINES_DSR;
1011	if (statusLines & TIOCM_CTS)
1012	newStatusLine \|= PDM_ICHAR_STATUS_LINES_CTS;
1013	rc = pThis->pDrvCharPort->pfnNotifyStatusLinesChanged(pThis->pDrvCharPort, newStatusLine);
1014	}
1015
1016	return VINF_SUCCESS;
1017	}
1018
1019	/**
1020	* Unblock the monitor thread so it can respond to a state change.
1021	* We need to execute this code exactly once during initialization.
1022	* But we don't want to block --- therefore this dedicated thread.
1023	*
1024	* @returns a VBox status code.
1025	* @param pDrvIns The driver instance.
1026	* @param pThread The send thread.
1027	*/
1028	static DECLCALLBACK(int) drvHostSerialWakeupMonitorThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
1029	{
1030	# ifdef RT_OS_LINUX
1031	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
1032	int rc = VINF_SUCCESS;
1033	# if 0
1034	unsigned int uSerialLineFlags;
1035	unsigned int uSerialLineStatus;
1036	unsigned int uIoctl;
1037	# endif
1038
1039	/*
1040	* Linux is a bit difficult as the thread is sleeping in an ioctl call.
1041	* So there is no way to have a wakeup pipe.
1042	*
1043	* 1. Thatswhy we set the serial device into loopback mode and change one of the
1044	* modem control bits.
1045	* This should make the ioctl call return.
1046	*
1047	* 2. We still got reports about long shutdown times. It may bepossible
1048	* that the loopback mode is not implemented on all devices.
1049	* The next possible solution is to close the device file to make the ioctl
1050	* return with EBADF and be able to suspend the thread.
1051	*
1052	* 3. The second approach doesn't work too, the ioctl doesn't return.
1053	* But it seems that the ioctl is interruptible (return code in errno is EINTR).
1054	*/
1055
1056	# if 0 /* Disabled because it does not work for all. */
1057	/* Get current status of control lines. */
1058	rc = ioctl(pThis->DeviceFile, TIOCMGET, &uSerialLineStatus);
1059	if (rc < 0)
1060	goto ioctl_error;
1061
1062	uSerialLineFlags = TIOCM_LOOP;
1063	rc = ioctl(pThis->DeviceFile, TIOCMBIS, &uSerialLineFlags);
1064	if (rc < 0)
1065	goto ioctl_error;
1066
1067	/*
1068	* Change current level on the RTS pin to make the ioctl call return in the
1069	* monitor thread.
1070	*/
1071	uIoctl = (uSerialLineStatus & TIOCM_CTS) ? TIOCMBIC : TIOCMBIS;
1072	uSerialLineFlags = TIOCM_RTS;
1073
1074	rc = ioctl(pThis->DeviceFile, uIoctl, &uSerialLineFlags);
1075	if (rc < 0)
1076	goto ioctl_error;
1077
1078	/* Change RTS back to the previous level. */
1079	uIoctl = (uIoctl == TIOCMBIC) ? TIOCMBIS : TIOCMBIC;
1080
1081	rc = ioctl(pThis->DeviceFile, uIoctl, &uSerialLineFlags);
1082	if (rc < 0)
1083	goto ioctl_error;
1084
1085	/*
1086	* Set serial device into normal state.
1087	*/
1088	uSerialLineFlags = TIOCM_LOOP;
1089	rc = ioctl(pThis->DeviceFile, TIOCMBIC, &uSerialLineFlags);
1090	if (rc >= 0)
1091	return VINF_SUCCESS;
1092
1093	ioctl_error:
1094	PDMDrvHlpVMSetRuntimeError(pDrvIns, false, "DrvHostSerialFail",
1095	N_("Ioctl failed for serial host device '%s' (%Rrc). The device will not work properly"),
1096	pThis->pszDevicePath, RTErrConvertFromErrno(errno));
1097	# endif
1098
1099	# if 0
1100	/* Close file to make ioctl return. */
1101	RTFileClose(pData->DeviceFile);
1102	/* Open again to make use after suspend possible again. */
1103	rc = RTFileOpen(&pData->DeviceFile, pData->pszDevicePath, RTFILE_O_OPEN \| RTFILE_O_READWRITE);
1104	AssertMsgRC(rc, ("Opening device file again failed rc=%Rrc\n", rc));
1105
1106	if (RT_FAILURE(rc))
1107	PDMDrvHlpVMSetRuntimeError(pDrvIns, false, "DrvHostSerialFail",
1108	N_("Opening failed for serial host device '%s' (%Rrc). The device will not work"),
1109	pData->pszDevicePath, rc);
1110	# endif
1111
1112	rc = RTThreadPoke(pThread->Thread);
1113	if (RT_FAILURE(rc))
1114	PDMDrvHlpVMSetRuntimeError(pDrvIns, false, "DrvHostSerialFail",
1115	N_("Suspending serial monitor thread failed for serial device '%s' (%Rrc). The shutdown may take longer than expected"),
1116	pThis->pszDevicePath, RTErrConvertFromErrno(rc));
1117
1118	# else /* !RT_OS_LINUX*/
1119
1120	/* In polling mode there is nobody to wake up (PDMThread will cancel the sleep). */
1121	NOREF(pDrvIns);
1122	NOREF(pThread);
1123
1124	# endif /* RT_OS_LINUX */
1125
1126	return VINF_SUCCESS;
1127	}
1128	#endif /* RT_OS_LINUX \|\| RT_OS_DARWIN \|\| RT_OS_SOLARIS */
1129
1130	/**
1131	* Set the modem lines.
1132	*
1133	* @returns VBox status code
1134	* @param pInterface Pointer to the interface structure.
1135	* @param RequestToSend Set to true if this control line should be made active.
1136	* @param DataTerminalReady Set to true if this control line should be made active.
1137	*/
1138	static DECLCALLBACK(int) drvHostSerialSetModemLines(PPDMICHAR pInterface, bool RequestToSend, bool DataTerminalReady)
1139	{
1140	PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
1141
1142	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
1143	int modemStateSet = 0;
1144	int modemStateClear = 0;
1145
1146	if (RequestToSend)
1147	modemStateSet \|= TIOCM_RTS;
1148	else
1149	modemStateClear \|= TIOCM_RTS;
1150
1151	if (DataTerminalReady)
1152	modemStateSet \|= TIOCM_DTR;
1153	else
1154	modemStateClear \|= TIOCM_DTR;
1155
1156	if (modemStateSet)
1157	ioctl(pThis->DeviceFile, TIOCMBIS, &modemStateSet);
1158
1159	if (modemStateClear)
1160	ioctl(pThis->DeviceFile, TIOCMBIC, &modemStateClear);
1161	#elif defined(RT_OS_WINDOWS)
1162	if (RequestToSend)
1163	EscapeCommFunction(pThis->hDeviceFile, SETRTS);
1164	else
1165	EscapeCommFunction(pThis->hDeviceFile, CLRRTS);
1166
1167	if (DataTerminalReady)
1168	EscapeCommFunction(pThis->hDeviceFile, SETDTR);
1169	else
1170	EscapeCommFunction(pThis->hDeviceFile, CLRDTR);
1171	#endif
1172
1173	return VINF_SUCCESS;
1174	}
1175
1176	/* -=-=-=-=- driver interface -=-=-=-=- */
1177
1178	/**
1179	* Construct a char driver instance.
1180	*
1181	* @returns VBox status.
1182	* @param pDrvIns The driver instance data.
1183	* If the registration structure is needed,
1184	* pDrvIns->pDrvReg points to it.
1185	* @param pCfgHandle Configuration node handle for the driver. Use this to
1186	* obtain the configuration of the driver instance. It's
1187	* also found in pDrvIns->pCfgHandle as it's expected to
1188	* be used frequently in this function.
1189	*/
1190	static DECLCALLBACK(int) drvHostSerialConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfgHandle)
1191	{
1192	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
1193	LogFlow(("%s: iInstance=%d\n", __FUNCTION__, pDrvIns->iInstance));
1194
1195	/*
1196	* Init basic data members and interfaces.
1197	*/
1198	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
1199	pThis->DeviceFile = NIL_RTFILE;
1200	# ifdef RT_OS_DARWIN
1201	pThis->DeviceFileR = NIL_RTFILE;
1202	# endif
1203	pThis->WakeupPipeR = NIL_RTFILE;
1204	pThis->WakeupPipeW = NIL_RTFILE;
1205	#endif
1206	/* IBase. */
1207	pDrvIns->IBase.pfnQueryInterface = drvHostSerialQueryInterface;
1208	/* IChar. */
1209	pThis->IChar.pfnWrite = drvHostSerialWrite;
1210	pThis->IChar.pfnSetParameters = drvHostSerialSetParameters;
1211	pThis->IChar.pfnSetModemLines = drvHostSerialSetModemLines;
1212
1213	/** @todo Initialize all members with NIL values!! The destructor is ALWAYS called. */
1214
1215	/*
1216	* Query configuration.
1217	*/
1218	/* Device */
1219	int rc = CFGMR3QueryStringAlloc(pCfgHandle, "DevicePath", &pThis->pszDevicePath);
1220	if (RT_FAILURE(rc))
1221	{
1222	AssertMsgFailed(("Configuration error: query for \"DevicePath\" string returned %Rra.\n", rc));
1223	return rc;
1224	}
1225
1226	/*
1227	* Open the device
1228	*/
1229	#ifdef RT_OS_WINDOWS
1230
1231	pThis->hHaltEventSem = CreateEvent(NULL, FALSE, FALSE, NULL);
1232	AssertReturn(pThis->hHaltEventSem != NULL, VERR_NO_MEMORY);
1233
1234	pThis->hEventRecv = CreateEvent(NULL, FALSE, FALSE, NULL);
1235	AssertReturn(pThis->hEventRecv != NULL, VERR_NO_MEMORY);
1236
1237	pThis->hEventSend = CreateEvent(NULL, FALSE, FALSE, NULL);
1238	AssertReturn(pThis->hEventSend != NULL, VERR_NO_MEMORY);
1239
1240	HANDLE hFile = CreateFile(pThis->pszDevicePath,
1241	GENERIC_READ \| GENERIC_WRITE,
1242	0, // must be opened with exclusive access
1243	NULL, // no SECURITY_ATTRIBUTES structure
1244	OPEN_EXISTING, // must use OPEN_EXISTING
1245	FILE_FLAG_OVERLAPPED, // overlapped I/O
1246	NULL); // no template file
1247	if (hFile == INVALID_HANDLE_VALUE)
1248	rc = RTErrConvertFromWin32(GetLastError());
1249	else
1250	{
1251	pThis->hDeviceFile = hFile;
1252	/* for overlapped read */
1253	if (!SetCommMask(hFile, EV_RXCHAR \| EV_CTS \| EV_DSR \| EV_RING \| EV_RLSD))
1254	{
1255	LogRel(("HostSerial#%d: SetCommMask failed with error %d.\n", pDrvIns->iInstance, GetLastError()));
1256	return VERR_FILE_IO_ERROR;
1257	}
1258	rc = VINF_SUCCESS;
1259	}
1260
1261	#else
1262
1263	rc = RTFileOpen(&pThis->DeviceFile, pThis->pszDevicePath, RTFILE_O_OPEN \| RTFILE_O_READWRITE);
1264	# ifdef RT_OS_DARWIN
1265	if (RT_SUCCESS(rc))
1266	rc = RTFileOpen(&pThis->DeviceFileR, pThis->pszDevicePath, RTFILE_O_OPEN \| RTFILE_O_READ);
1267	# endif
1268
1269
1270	#endif
1271
1272	if (RT_FAILURE(rc))
1273	{
1274	AssertMsgFailed(("Could not open host device %s, rc=%Rrc\n", pThis->pszDevicePath, rc));
1275	switch (rc)
1276	{
1277	case VERR_ACCESS_DENIED:
1278	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1279	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
1280	N_("Cannot open host device '%s' for read/write access. Check the permissions "
1281	"of that device ('/bin/ls -l %s'): Most probably you need to be member "
1282	"of the device group. Make sure that you logout/login after changing "
1283	"the group settings of the current user"),
1284	#else
1285	N_("Cannot open host device '%s' for read/write access. Check the permissions "
1286	"of that device"),
1287	#endif
1288	pThis->pszDevicePath, pThis->pszDevicePath);
1289	default:
1290	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1291	N_("Failed to open host device '%s'"),
1292	pThis->pszDevicePath);
1293	}
1294	}
1295
1296	/* Set to non blocking I/O */
1297	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
1298
1299	fcntl(pThis->DeviceFile, F_SETFL, O_NONBLOCK);
1300	# ifdef RT_OS_DARWIN
1301	fcntl(pThis->DeviceFileR, F_SETFL, O_NONBLOCK);
1302	# endif
1303	int aFDs[2];
1304	if (pipe(aFDs) != 0)
1305	{
1306	int rc = RTErrConvertFromErrno(errno);
1307	AssertRC(rc);
1308	return rc;
1309	}
1310	pThis->WakeupPipeR = aFDs[0];
1311	pThis->WakeupPipeW = aFDs[1];
1312
1313	#elif defined(RT_OS_WINDOWS)
1314
1315	/* Set the COMMTIMEOUTS to get non blocking I/O */
1316	COMMTIMEOUTS comTimeout;
1317
1318	comTimeout.ReadIntervalTimeout = MAXDWORD;
1319	comTimeout.ReadTotalTimeoutMultiplier = 0;
1320	comTimeout.ReadTotalTimeoutConstant = 0;
1321	comTimeout.WriteTotalTimeoutMultiplier = 0;
1322	comTimeout.WriteTotalTimeoutConstant = 0;
1323
1324	SetCommTimeouts(pThis->hDeviceFile, &comTimeout);
1325
1326	#endif
1327
1328	/*
1329	* Get the ICharPort interface of the above driver/device.
1330	*/
1331	pThis->pDrvCharPort = (PPDMICHARPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_CHAR_PORT);
1332	if (!pThis->pDrvCharPort)
1333	return PDMDrvHlpVMSetError(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE, RT_SRC_POS, N_("HostSerial#%d has no char port interface above"), pDrvIns->iInstance);
1334
1335	/*
1336	* Create the receive, send and monitor threads pluss the related send semaphore.
1337	*/
1338	rc = PDMDrvHlpPDMThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvHostSerialRecvThread, drvHostSerialWakeupRecvThread, 0, RTTHREADTYPE_IO, "SerRecv");
1339	if (RT_FAILURE(rc))
1340	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("HostSerial#%d cannot create receive thread"), pDrvIns->iInstance);
1341
1342	rc = RTSemEventCreate(&pThis->SendSem);
1343	AssertRC(rc);
1344
1345	rc = PDMDrvHlpPDMThreadCreate(pDrvIns, &pThis->pSendThread, pThis, drvHostSerialSendThread, drvHostSerialWakeupSendThread, 0, RTTHREADTYPE_IO, "SerSend");
1346	if (RT_FAILURE(rc))
1347	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("HostSerial#%d cannot create send thread"), pDrvIns->iInstance);
1348
1349	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
1350	/* Linux & darwin needs a separate thread which monitors the status lines. */
1351	# ifndef RT_OS_LINUX
1352	ioctl(pThis->DeviceFile, TIOCMGET, &pThis->fStatusLines);
1353	# endif
1354	rc = PDMDrvHlpPDMThreadCreate(pDrvIns, &pThis->pMonitorThread, pThis, drvHostSerialMonitorThread, drvHostSerialWakeupMonitorThread, 0, RTTHREADTYPE_IO, "SerMon");
1355	if (RT_FAILURE(rc))
1356	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("HostSerial#%d cannot create monitor thread"), pDrvIns->iInstance);
1357	#endif
1358
1359	/*
1360	* Register release statistics.
1361	*/
1362	PDMDrvHlpSTAMRegisterF(pDrvIns, &pThis->StatBytesWritten, STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes written", "/Devices/HostSerial%d/Written", pDrvIns->iInstance);
1363	PDMDrvHlpSTAMRegisterF(pDrvIns, &pThis->StatBytesRead, STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes read", "/Devices/HostSerial%d/Read", pDrvIns->iInstance);
1364	#ifdef RT_OS_DARWIN /* new Write code, not darwin specific. */
1365	PDMDrvHlpSTAMRegisterF(pDrvIns, &pThis->StatSendOverflows, STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes overflowed", "/Devices/HostSerial%d/SendOverflow", pDrvIns->iInstance);
1366	#endif
1367
1368	return VINF_SUCCESS;
1369	}
1370
1371
1372	/**
1373	* Destruct a char driver instance.
1374	*
1375	* Most VM resources are freed by the VM. This callback is provided so that
1376	* any non-VM resources can be freed correctly.
1377	*
1378	* @param pDrvIns The driver instance data.
1379	*/
1380	static DECLCALLBACK(void) drvHostSerialDestruct(PPDMDRVINS pDrvIns)
1381	{
1382	PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
1383
1384	LogFlow(("%s: iInstance=%d\n", __FUNCTION__, pDrvIns->iInstance));
1385
1386	/* Empty the send queue */
1387	pThis->iSendQueueTail = pThis->iSendQueueHead = 0;
1388
1389	RTSemEventDestroy(pThis->SendSem);
1390	pThis->SendSem = NIL_RTSEMEVENT;
1391
1392	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS)
1393
1394	if (pThis->WakeupPipeW != NIL_RTFILE)
1395	{
1396	int rc = RTFileClose(pThis->WakeupPipeW);
1397	AssertRC(rc);
1398	pThis->WakeupPipeW = NIL_RTFILE;
1399	}
1400	if (pThis->WakeupPipeR != NIL_RTFILE)
1401	{
1402	int rc = RTFileClose(pThis->WakeupPipeR);
1403	AssertRC(rc);
1404	pThis->WakeupPipeR = NIL_RTFILE;
1405	}
1406	# if defined(RT_OS_DARWIN)
1407	if (pThis->DeviceFileR != NIL_RTFILE)
1408	{
1409	if (pThis->DeviceFileR != pThis->DeviceFile)
1410	{
1411	int rc = RTFileClose(pThis->DeviceFileR);
1412	AssertRC(rc);
1413	}
1414	pThis->DeviceFileR = NIL_RTFILE;
1415	}
1416	# endif
1417	if (pThis->DeviceFile != NIL_RTFILE)
1418	{
1419	int rc = RTFileClose(pThis->DeviceFile);
1420	AssertRC(rc);
1421	pThis->DeviceFile = NIL_RTFILE;
1422	}
1423
1424	#elif defined(RT_OS_WINDOWS)
1425
1426	CloseHandle(pThis->hEventRecv);
1427	CloseHandle(pThis->hEventSend);
1428	CancelIo(pThis->hDeviceFile);
1429	CloseHandle(pThis->hDeviceFile);
1430
1431	#endif
1432	}
1433
1434	/**
1435	* Char driver registration record.
1436	*/
1437	const PDMDRVREG g_DrvHostSerial =
1438	{
1439	/* u32Version */
1440	PDM_DRVREG_VERSION,
1441	/* szDriverName */
1442	"Host Serial",
1443	/* pszDescription */
1444	"Host serial driver.",
1445	/* fFlags */
1446	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1447	/* fClass. */
1448	PDM_DRVREG_CLASS_CHAR,
1449	/* cMaxInstances */
1450	~0,
1451	/* cbInstance */
1452	sizeof(DRVHOSTSERIAL),
1453	/* pfnConstruct */
1454	drvHostSerialConstruct,
1455	/* pfnDestruct */
1456	drvHostSerialDestruct,
1457	/* pfnIOCtl */
1458	NULL,
1459	/* pfnPowerOn */
1460	NULL,
1461	/* pfnReset */
1462	NULL,
1463	/* pfnSuspend */
1464	NULL,
1465	/* pfnResume */
1466	NULL,
1467	/* pfnDetach */
1468	NULL,
1469	/** pfnPowerOff */
1470	NULL
1471	};
1472

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source: vbox/trunk/src/VBox/Devices/Serial/DrvHostSerial.cpp@ 17802

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