VirtualBox

source: vbox/trunk/src/VBox/Devices/Serial/DrvHostSerial.cpp@ 68699

Last change on this file since 68699 was 64276, checked in by vboxsync, 8 years ago

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1/* $Id: DrvHostSerial.cpp 64276 2016-10-14 11:16:06Z vboxsync $ */
2/** @file
3 * VBox stream I/O devices: Host serial driver
4 */
5
6/*
7 * Copyright (C) 2006-2016 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18
19
20/*********************************************************************************************************************************
21* Header Files *
22*********************************************************************************************************************************/
23#define LOG_GROUP LOG_GROUP_DRV_HOST_SERIAL
24#include <VBox/vmm/pdm.h>
25#include <VBox/err.h>
26
27#include <VBox/log.h>
28#include <iprt/asm.h>
29#include <iprt/assert.h>
30#include <iprt/file.h>
31#include <iprt/mem.h>
32#include <iprt/pipe.h>
33#include <iprt/semaphore.h>
34#include <iprt/uuid.h>
35
36#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
37# include <errno.h>
38# ifdef RT_OS_SOLARIS
39# include <sys/termios.h>
40# else
41# include <termios.h>
42# endif
43# include <sys/types.h>
44# include <fcntl.h>
45# include <string.h>
46# include <unistd.h>
47# ifdef RT_OS_DARWIN
48# include <sys/select.h>
49# else
50# include <sys/poll.h>
51# endif
52# include <sys/ioctl.h>
53# include <pthread.h>
54
55# ifdef RT_OS_LINUX
56/*
57 * TIOCM_LOOP is not defined in the above header files for some reason but in asm/termios.h.
58 * But inclusion of this file however leads to compilation errors because of redefinition of some
59 * structs. That's why it is defined here until a better solution is found.
60 */
61# ifndef TIOCM_LOOP
62# define TIOCM_LOOP 0x8000
63# endif
64/* For linux custom baudrate code we also need serial_struct */
65# include <linux/serial.h>
66# endif /* linux */
67
68#elif defined(RT_OS_WINDOWS)
69# include <iprt/win/windows.h>
70#endif
71
72#include "VBoxDD.h"
73
74
75/*********************************************************************************************************************************
76* Structures and Typedefs *
77*********************************************************************************************************************************/
78
79/**
80 * Char driver instance data.
81 *
82 * @implements PDMICHARCONNECTOR
83 */
84typedef struct DRVHOSTSERIAL
85{
86 /** Pointer to the driver instance structure. */
87 PPDMDRVINS pDrvIns;
88 /** Pointer to the char port interface of the driver/device above us. */
89 PPDMICHARPORT pDrvCharPort;
90 /** Our char interface. */
91 PDMICHARCONNECTOR ICharConnector;
92 /** Receive thread. */
93 PPDMTHREAD pRecvThread;
94 /** Send thread. */
95 PPDMTHREAD pSendThread;
96 /** Status lines monitor thread. */
97 PPDMTHREAD pMonitorThread;
98 /** Send event semaphore */
99 RTSEMEVENT SendSem;
100
101 /** the device path */
102 char *pszDevicePath;
103
104#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
105 /** the device handle */
106 RTFILE hDeviceFile;
107# ifdef RT_OS_DARWIN
108 /** The device handle used for reading.
109 * Used to prevent the read select from blocking the writes. */
110 RTFILE hDeviceFileR;
111# endif
112 /** The read end of the control pipe */
113 RTPIPE hWakeupPipeR;
114 /** The write end of the control pipe */
115 RTPIPE hWakeupPipeW;
116 /** The current line status.
117 * Used by the polling version of drvHostSerialMonitorThread. */
118 int fStatusLines;
119#elif defined(RT_OS_WINDOWS)
120 /** the device handle */
121 HANDLE hDeviceFile;
122 /** The event semaphore for waking up the receive thread */
123 HANDLE hHaltEventSem;
124 /** The event semaphore for overlapped receiving */
125 HANDLE hEventRecv;
126 /** For overlapped receiving */
127 OVERLAPPED overlappedRecv;
128 /** The event semaphore for overlapped sending */
129 HANDLE hEventSend;
130 /** For overlapped sending */
131 OVERLAPPED overlappedSend;
132#endif
133
134 /** Internal send FIFO queue */
135 uint8_t volatile u8SendByte;
136 bool volatile fSending;
137 uint8_t Alignment[2];
138
139 /** Read/write statistics */
140 STAMCOUNTER StatBytesRead;
141 STAMCOUNTER StatBytesWritten;
142#ifdef RT_OS_DARWIN
143 /** The number of bytes we've dropped because the send queue
144 * was full. */
145 STAMCOUNTER StatSendOverflows;
146#endif
147} DRVHOSTSERIAL, *PDRVHOSTSERIAL;
148
149
150/** Converts a pointer to DRVCHAR::ICharConnector to a PDRVHOSTSERIAL. */
151#define PDMICHAR_2_DRVHOSTSERIAL(pInterface) RT_FROM_MEMBER(pInterface, DRVHOSTSERIAL, ICharConnector)
152
153
154/* -=-=-=-=- IBase -=-=-=-=- */
155
156/**
157 * @interface_method_impl{PDMIBASE,pfnQueryInterface}
158 */
159static DECLCALLBACK(void *) drvHostSerialQueryInterface(PPDMIBASE pInterface, const char *pszIID)
160{
161 PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
162 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
163
164 PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
165 PDMIBASE_RETURN_INTERFACE(pszIID, PDMICHARCONNECTOR, &pThis->ICharConnector);
166 return NULL;
167}
168
169
170/* -=-=-=-=- ICharConnector -=-=-=-=- */
171
172/** @interface_method_impl{PDMICHARCONNECTOR,pfnWrite} */
173static DECLCALLBACK(int) drvHostSerialWrite(PPDMICHARCONNECTOR pInterface, const void *pvBuf, size_t cbWrite)
174{
175 PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
176 const uint8_t *pbBuffer = (const uint8_t *)pvBuf;
177
178 LogFlow(("%s: pvBuf=%#p cbWrite=%d\n", __FUNCTION__, pvBuf, cbWrite));
179
180 for (uint32_t i = 0; i < cbWrite; i++)
181 {
182 if (ASMAtomicXchgBool(&pThis->fSending, true))
183 return VERR_BUFFER_OVERFLOW;
184
185 pThis->u8SendByte = pbBuffer[i];
186 RTSemEventSignal(pThis->SendSem);
187 STAM_COUNTER_INC(&pThis->StatBytesWritten);
188 }
189 return VINF_SUCCESS;
190}
191
192static DECLCALLBACK(int) drvHostSerialSetParameters(PPDMICHARCONNECTOR pInterface, unsigned Bps, char chParity, unsigned cDataBits, unsigned cStopBits)
193{
194 PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
195#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
196 struct termios *termiosSetup;
197 int baud_rate;
198#elif defined(RT_OS_WINDOWS)
199 LPDCB comSetup;
200#endif
201
202 LogFlow(("%s: Bps=%u chParity=%c cDataBits=%u cStopBits=%u\n", __FUNCTION__, Bps, chParity, cDataBits, cStopBits));
203
204#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
205 termiosSetup = (struct termios *)RTMemTmpAllocZ(sizeof(struct termios));
206
207 /* Enable receiver */
208 termiosSetup->c_cflag |= (CLOCAL | CREAD);
209
210 switch (Bps)
211 {
212 case 50:
213 baud_rate = B50;
214 break;
215 case 75:
216 baud_rate = B75;
217 break;
218 case 110:
219 baud_rate = B110;
220 break;
221 case 134:
222 baud_rate = B134;
223 break;
224 case 150:
225 baud_rate = B150;
226 break;
227 case 200:
228 baud_rate = B200;
229 break;
230 case 300:
231 baud_rate = B300;
232 break;
233 case 600:
234 baud_rate = B600;
235 break;
236 case 1200:
237 baud_rate = B1200;
238 break;
239 case 1800:
240 baud_rate = B1800;
241 break;
242 case 2400:
243 baud_rate = B2400;
244 break;
245 case 4800:
246 baud_rate = B4800;
247 break;
248 case 9600:
249 baud_rate = B9600;
250 break;
251 case 19200:
252 baud_rate = B19200;
253 break;
254 case 38400:
255 baud_rate = B38400;
256 break;
257 case 57600:
258 baud_rate = B57600;
259 break;
260 case 115200:
261 baud_rate = B115200;
262 break;
263 default:
264#ifdef RT_OS_LINUX
265 struct serial_struct serialStruct;
266 if (ioctl(RTFileToNative(pThis->hDeviceFile), TIOCGSERIAL, &serialStruct) != -1)
267 {
268 serialStruct.custom_divisor = serialStruct.baud_base / Bps;
269 if (!serialStruct.custom_divisor)
270 serialStruct.custom_divisor = 1;
271 serialStruct.flags &= ~ASYNC_SPD_MASK;
272 serialStruct.flags |= ASYNC_SPD_CUST;
273 ioctl(RTFileToNative(pThis->hDeviceFile), TIOCSSERIAL, &serialStruct);
274 baud_rate = B38400;
275 }
276 else
277 baud_rate = B9600;
278#else /* !RT_OS_LINUX */
279 baud_rate = B9600;
280#endif /* !RT_OS_LINUX */
281 }
282
283 cfsetispeed(termiosSetup, baud_rate);
284 cfsetospeed(termiosSetup, baud_rate);
285
286 switch (chParity)
287 {
288 case 'E':
289 termiosSetup->c_cflag |= PARENB;
290 break;
291 case 'O':
292 termiosSetup->c_cflag |= (PARENB | PARODD);
293 break;
294 case 'N':
295 break;
296 default:
297 break;
298 }
299
300 switch (cDataBits)
301 {
302 case 5:
303 termiosSetup->c_cflag |= CS5;
304 break;
305 case 6:
306 termiosSetup->c_cflag |= CS6;
307 break;
308 case 7:
309 termiosSetup->c_cflag |= CS7;
310 break;
311 case 8:
312 termiosSetup->c_cflag |= CS8;
313 break;
314 default:
315 break;
316 }
317
318 switch (cStopBits)
319 {
320 case 2:
321 termiosSetup->c_cflag |= CSTOPB;
322 default:
323 break;
324 }
325
326 /* set serial port to raw input */
327 termiosSetup->c_lflag &= ~(ICANON | ECHO | ECHOE | ECHONL | ECHOK | ISIG | IEXTEN);
328
329 tcsetattr(RTFileToNative(pThis->hDeviceFile), TCSANOW, termiosSetup);
330 RTMemTmpFree(termiosSetup);
331
332#ifdef RT_OS_LINUX
333 /*
334 * XXX In Linux, if a thread calls tcsetattr while the monitor thread is
335 * waiting in ioctl for a modem status change then 8250.c wrongly disables
336 * modem irqs and so the monitor thread never gets released. The workaround
337 * is to send a signal after each tcsetattr.
338 */
339 RTThreadPoke(pThis->pMonitorThread->Thread);
340#endif
341
342#elif defined(RT_OS_WINDOWS)
343 comSetup = (LPDCB)RTMemTmpAllocZ(sizeof(DCB));
344
345 comSetup->DCBlength = sizeof(DCB);
346
347 switch (Bps)
348 {
349 case 110:
350 comSetup->BaudRate = CBR_110;
351 break;
352 case 300:
353 comSetup->BaudRate = CBR_300;
354 break;
355 case 600:
356 comSetup->BaudRate = CBR_600;
357 break;
358 case 1200:
359 comSetup->BaudRate = CBR_1200;
360 break;
361 case 2400:
362 comSetup->BaudRate = CBR_2400;
363 break;
364 case 4800:
365 comSetup->BaudRate = CBR_4800;
366 break;
367 case 9600:
368 comSetup->BaudRate = CBR_9600;
369 break;
370 case 14400:
371 comSetup->BaudRate = CBR_14400;
372 break;
373 case 19200:
374 comSetup->BaudRate = CBR_19200;
375 break;
376 case 38400:
377 comSetup->BaudRate = CBR_38400;
378 break;
379 case 57600:
380 comSetup->BaudRate = CBR_57600;
381 break;
382 case 115200:
383 comSetup->BaudRate = CBR_115200;
384 break;
385 default:
386 comSetup->BaudRate = CBR_9600;
387 }
388
389 comSetup->fBinary = TRUE;
390 comSetup->fOutxCtsFlow = FALSE;
391 comSetup->fOutxDsrFlow = FALSE;
392 comSetup->fDtrControl = DTR_CONTROL_DISABLE;
393 comSetup->fDsrSensitivity = FALSE;
394 comSetup->fTXContinueOnXoff = TRUE;
395 comSetup->fOutX = FALSE;
396 comSetup->fInX = FALSE;
397 comSetup->fErrorChar = FALSE;
398 comSetup->fNull = FALSE;
399 comSetup->fRtsControl = RTS_CONTROL_DISABLE;
400 comSetup->fAbortOnError = FALSE;
401 comSetup->wReserved = 0;
402 comSetup->XonLim = 5;
403 comSetup->XoffLim = 5;
404 comSetup->ByteSize = cDataBits;
405
406 switch (chParity)
407 {
408 case 'E':
409 comSetup->Parity = EVENPARITY;
410 break;
411 case 'O':
412 comSetup->Parity = ODDPARITY;
413 break;
414 case 'N':
415 comSetup->Parity = NOPARITY;
416 break;
417 default:
418 break;
419 }
420
421 switch (cStopBits)
422 {
423 case 1:
424 comSetup->StopBits = ONESTOPBIT;
425 break;
426 case 2:
427 comSetup->StopBits = TWOSTOPBITS;
428 break;
429 default:
430 break;
431 }
432
433 comSetup->XonChar = 0;
434 comSetup->XoffChar = 0;
435 comSetup->ErrorChar = 0;
436 comSetup->EofChar = 0;
437 comSetup->EvtChar = 0;
438
439 SetCommState(pThis->hDeviceFile, comSetup);
440 RTMemTmpFree(comSetup);
441#endif /* RT_OS_WINDOWS */
442
443 return VINF_SUCCESS;
444}
445
446/* -=-=-=-=- receive thread -=-=-=-=- */
447
448/**
449 * Send thread loop.
450 *
451 * @returns VINF_SUCCESS.
452 * @param pDrvIns PDM driver instance data.
453 * @param pThread The PDM thread data.
454 */
455static DECLCALLBACK(int) drvHostSerialSendThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
456{
457 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
458
459 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
460 return VINF_SUCCESS;
461
462#ifdef RT_OS_WINDOWS
463 /* Make sure that the halt event semaphore is reset. */
464 DWORD dwRet = WaitForSingleObject(pThis->hHaltEventSem, 0);
465
466 HANDLE haWait[2];
467 haWait[0] = pThis->hEventSend;
468 haWait[1] = pThis->hHaltEventSem;
469#endif
470
471 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
472 {
473 int rc = RTSemEventWait(pThis->SendSem, RT_INDEFINITE_WAIT);
474 AssertRCBreak(rc);
475
476 /*
477 * Write the character to the host device.
478 */
479 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
480 {
481 /* copy the send queue so we get a linear buffer with the maximal size. */
482 uint8_t ch = pThis->u8SendByte;
483#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
484
485 size_t cbWritten;
486 rc = RTFileWrite(pThis->hDeviceFile, &ch, 1, &cbWritten);
487 if (rc == VERR_TRY_AGAIN)
488 cbWritten = 0;
489 if (cbWritten < 1 && (RT_SUCCESS(rc) || rc == VERR_TRY_AGAIN))
490 {
491 /* ok, block till the device is ready for more (O_NONBLOCK) effect. */
492 rc = VINF_SUCCESS;
493 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
494 {
495 /* wait */
496 fd_set WrSet;
497 FD_ZERO(&WrSet);
498 FD_SET(RTFileToNative(pThis->hDeviceFile), &WrSet);
499 fd_set XcptSet;
500 FD_ZERO(&XcptSet);
501 FD_SET(RTFileToNative(pThis->hDeviceFile), &XcptSet);
502# ifdef DEBUG
503 uint64_t u64Now = RTTimeMilliTS();
504# endif
505 rc = select(RTFileToNative(pThis->hDeviceFile) + 1, NULL, &WrSet, &XcptSet, NULL);
506 /** @todo check rc? */
507
508# ifdef DEBUG
509 Log2(("select wait for %dms\n", RTTimeMilliTS() - u64Now));
510# endif
511 /* try write more */
512 rc = RTFileWrite(pThis->hDeviceFile, &ch, 1, &cbWritten);
513 if (rc == VERR_TRY_AGAIN)
514 cbWritten = 0;
515 else if (RT_FAILURE(rc))
516 break;
517 else if (cbWritten >= 1)
518 break;
519 rc = VINF_SUCCESS;
520 } /* wait/write loop */
521 }
522
523#elif defined(RT_OS_WINDOWS)
524 /* perform an overlapped write operation. */
525 DWORD cbWritten;
526 memset(&pThis->overlappedSend, 0, sizeof(pThis->overlappedSend));
527 pThis->overlappedSend.hEvent = pThis->hEventSend;
528 if (!WriteFile(pThis->hDeviceFile, &ch, 1, &cbWritten, &pThis->overlappedSend))
529 {
530 dwRet = GetLastError();
531 if (dwRet == ERROR_IO_PENDING)
532 {
533 /*
534 * write blocked, wait for completion or wakeup...
535 */
536 dwRet = WaitForMultipleObjects(2, haWait, FALSE, INFINITE);
537 if (dwRet != WAIT_OBJECT_0)
538 {
539 AssertMsg(pThread->enmState != PDMTHREADSTATE_RUNNING, ("The halt event semaphore is set but the thread is still in running state\n"));
540 break;
541 }
542 }
543 else
544 rc = RTErrConvertFromWin32(dwRet);
545 }
546
547#endif /* RT_OS_WINDOWS */
548 if (RT_FAILURE(rc))
549 {
550 LogRel(("HostSerial#%d: Serial Write failed with %Rrc; terminating send thread\n", pDrvIns->iInstance, rc));
551 return rc;
552 }
553 ASMAtomicXchgBool(&pThis->fSending, false);
554 break;
555 } /* write loop */
556 }
557
558 return VINF_SUCCESS;
559}
560
561/**
562 * Unblock the send thread so it can respond to a state change.
563 *
564 * @returns a VBox status code.
565 * @param pDrvIns The driver instance.
566 * @param pThread The send thread.
567 */
568static DECLCALLBACK(int) drvHostSerialWakeupSendThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
569{
570 RT_NOREF(pThread);
571 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
572 int rc;
573
574 rc = RTSemEventSignal(pThis->SendSem);
575 if (RT_FAILURE(rc))
576 return rc;
577
578#ifdef RT_OS_WINDOWS
579 if (!SetEvent(pThis->hHaltEventSem))
580 return RTErrConvertFromWin32(GetLastError());
581#endif
582
583 return VINF_SUCCESS;
584}
585
586/* -=-=-=-=- receive thread -=-=-=-=- */
587
588/**
589 * Receive thread loop.
590 *
591 * This thread pushes data from the host serial device up the driver
592 * chain toward the serial device.
593 *
594 * @returns VINF_SUCCESS.
595 * @param pDrvIns PDM driver instance data.
596 * @param pThread The PDM thread data.
597 */
598static DECLCALLBACK(int) drvHostSerialRecvThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
599{
600 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
601 uint8_t abBuffer[256];
602 uint8_t *pbBuffer = NULL;
603 size_t cbRemaining = 0; /* start by reading host data */
604 int rc = VINF_SUCCESS;
605 int rcThread = VINF_SUCCESS;
606
607 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
608 return VINF_SUCCESS;
609
610#ifdef RT_OS_WINDOWS
611 /* Make sure that the halt event semaphore is reset. */
612 DWORD dwRet = WaitForSingleObject(pThis->hHaltEventSem, 0);
613
614 HANDLE ahWait[2];
615 ahWait[0] = pThis->hEventRecv;
616 ahWait[1] = pThis->hHaltEventSem;
617#endif
618
619 while (pThread->enmState == PDMTHREADSTATE_RUNNING)
620 {
621 if (!cbRemaining)
622 {
623 /* Get a block of data from the host serial device. */
624
625#if defined(RT_OS_DARWIN) /* poll is broken on x86 darwin, returns POLLNVAL. */
626 fd_set RdSet;
627 FD_ZERO(&RdSet);
628 FD_SET(RTFileToNative(pThis->hDeviceFileR), &RdSet);
629 FD_SET(RTPipeToNative(pThis->hWakeupPipeR), &RdSet);
630 fd_set XcptSet;
631 FD_ZERO(&XcptSet);
632 FD_SET(RTFileToNative(pThis->hDeviceFile), &XcptSet);
633 FD_SET(RTPipeToNative(pThis->hWakeupPipeR), &XcptSet);
634# if 1 /* it seems like this select is blocking the write... */
635 rc = select(RT_MAX(RTPipeToNative(pThis->hWakeupPipeR), RTFileToNative(pThis->hDeviceFileR)) + 1,
636 &RdSet, NULL, &XcptSet, NULL);
637# else
638 struct timeval tv = { 0, 1000 };
639 rc = select(RTPipeToNative(pThis->hWakeupPipeR), RTFileToNative(pThis->hDeviceFileR) + 1,
640 &RdSet, NULL, &XcptSet, &tv);
641# endif
642 if (rc == -1)
643 {
644 int err = errno;
645 rcThread = RTErrConvertFromErrno(err);
646 LogRel(("HostSerial#%d: select failed with errno=%d / %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, err, rcThread));
647 break;
648 }
649
650 /* this might have changed in the meantime */
651 if (pThread->enmState != PDMTHREADSTATE_RUNNING)
652 break;
653 if (rc == 0)
654 continue;
655
656 /* drain the wakeup pipe */
657 size_t cbRead;
658 if ( FD_ISSET(RTPipeToNative(pThis->hWakeupPipeR), &RdSet)
659 || FD_ISSET(RTPipeToNative(pThis->hWakeupPipeR), &XcptSet))
660 {
661 rc = RTPipeRead(pThis->hWakeupPipeR, abBuffer, 1, &cbRead);
662 if (RT_FAILURE(rc))
663 {
664 LogRel(("HostSerial#%d: draining the wakeup pipe failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
665 rcThread = rc;
666 break;
667 }
668 continue;
669 }
670
671 /* read data from the serial port. */
672 rc = RTFileRead(pThis->hDeviceFileR, abBuffer, sizeof(abBuffer), &cbRead);
673 if (RT_FAILURE(rc))
674 {
675 LogRel(("HostSerial#%d: (1) Read failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
676 rcThread = rc;
677 break;
678 }
679 cbRemaining = cbRead;
680
681#elif defined(RT_OS_LINUX) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
682
683 size_t cbRead;
684 struct pollfd aFDs[2];
685 aFDs[0].fd = RTFileToNative(pThis->hDeviceFile);
686 aFDs[0].events = POLLIN;
687 aFDs[0].revents = 0;
688 aFDs[1].fd = RTPipeToNative(pThis->hWakeupPipeR);
689 aFDs[1].events = POLLIN | POLLERR | POLLHUP;
690 aFDs[1].revents = 0;
691 rc = poll(aFDs, RT_ELEMENTS(aFDs), -1);
692 if (rc < 0)
693 {
694 int err = errno;
695 if (err == EINTR)
696 {
697 /*
698 * EINTR errors should be harmless, even if they are not supposed to occur in our setup.
699 */
700 Log(("rc=%d revents=%#x,%#x errno=%p %s\n", rc, aFDs[0].revents, aFDs[1].revents, err, strerror(err)));
701 RTThreadYield();
702 continue;
703 }
704
705 rcThread = RTErrConvertFromErrno(err);
706 LogRel(("HostSerial#%d: poll failed with errno=%d / %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, err, rcThread));
707 break;
708 }
709 /* this might have changed in the meantime */
710 if (pThread->enmState != PDMTHREADSTATE_RUNNING)
711 break;
712 if (rc > 0 && aFDs[1].revents)
713 {
714 if (aFDs[1].revents & (POLLHUP | POLLERR | POLLNVAL))
715 break;
716 /* notification to terminate -- drain the pipe */
717 RTPipeRead(pThis->hWakeupPipeR, &abBuffer, 1, &cbRead);
718 continue;
719 }
720 rc = RTFileRead(pThis->hDeviceFile, abBuffer, sizeof(abBuffer), &cbRead);
721 if (RT_FAILURE(rc))
722 {
723 /* don't terminate worker thread when data unavailable */
724 if (rc == VERR_TRY_AGAIN)
725 continue;
726
727 LogRel(("HostSerial#%d: (2) Read failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
728 rcThread = rc;
729 break;
730 }
731 cbRemaining = cbRead;
732
733#elif defined(RT_OS_WINDOWS)
734
735 DWORD dwEventMask = 0;
736 DWORD dwNumberOfBytesTransferred;
737
738 memset(&pThis->overlappedRecv, 0, sizeof(pThis->overlappedRecv));
739 pThis->overlappedRecv.hEvent = pThis->hEventRecv;
740
741 if (!WaitCommEvent(pThis->hDeviceFile, &dwEventMask, &pThis->overlappedRecv))
742 {
743 dwRet = GetLastError();
744 if (dwRet == ERROR_IO_PENDING)
745 {
746 dwRet = WaitForMultipleObjects(2, ahWait, FALSE, INFINITE);
747 if (dwRet != WAIT_OBJECT_0)
748 {
749 /* notification to terminate */
750 AssertMsg(pThread->enmState != PDMTHREADSTATE_RUNNING, ("The halt event semaphore is set but the thread is still in running state\n"));
751 break;
752 }
753 }
754 else
755 {
756 rcThread = RTErrConvertFromWin32(dwRet);
757 LogRel(("HostSerial#%d: Wait failed with error %Rrc; terminating the worker thread.\n", pDrvIns->iInstance, rcThread));
758 break;
759 }
760 }
761 /* this might have changed in the meantime */
762 if (pThread->enmState != PDMTHREADSTATE_RUNNING)
763 break;
764
765 /* Check the event */
766 if (dwEventMask & EV_RXCHAR)
767 {
768 if (!ReadFile(pThis->hDeviceFile, abBuffer, sizeof(abBuffer), &dwNumberOfBytesTransferred, &pThis->overlappedRecv))
769 {
770 dwRet = GetLastError();
771 if (dwRet == ERROR_IO_PENDING)
772 {
773 if (GetOverlappedResult(pThis->hDeviceFile, &pThis->overlappedRecv, &dwNumberOfBytesTransferred, TRUE))
774 dwRet = NO_ERROR;
775 else
776 dwRet = GetLastError();
777 }
778 if (dwRet != NO_ERROR)
779 {
780 rcThread = RTErrConvertFromWin32(dwRet);
781 LogRel(("HostSerial#%d: Read failed with error %Rrc; terminating the worker thread.\n", pDrvIns->iInstance, rcThread));
782 break;
783 }
784 }
785 cbRemaining = dwNumberOfBytesTransferred;
786 }
787 else if (dwEventMask & EV_BREAK)
788 {
789 Log(("HostSerial#%d: Detected break\n"));
790 rc = pThis->pDrvCharPort->pfnNotifyBreak(pThis->pDrvCharPort);
791 }
792 else
793 {
794 /* The status lines have changed. Notify the device. */
795 DWORD dwNewStatusLinesState = 0;
796 uint32_t uNewStatusLinesState = 0;
797
798 /* Get the new state */
799 if (GetCommModemStatus(pThis->hDeviceFile, &dwNewStatusLinesState))
800 {
801 if (dwNewStatusLinesState & MS_RLSD_ON)
802 uNewStatusLinesState |= PDMICHARPORT_STATUS_LINES_DCD;
803 if (dwNewStatusLinesState & MS_RING_ON)
804 uNewStatusLinesState |= PDMICHARPORT_STATUS_LINES_RI;
805 if (dwNewStatusLinesState & MS_DSR_ON)
806 uNewStatusLinesState |= PDMICHARPORT_STATUS_LINES_DSR;
807 if (dwNewStatusLinesState & MS_CTS_ON)
808 uNewStatusLinesState |= PDMICHARPORT_STATUS_LINES_CTS;
809 rc = pThis->pDrvCharPort->pfnNotifyStatusLinesChanged(pThis->pDrvCharPort, uNewStatusLinesState);
810 if (RT_FAILURE(rc))
811 {
812 /* Notifying device failed, continue but log it */
813 LogRel(("HostSerial#%d: Notifying device failed with error %Rrc; continuing.\n", pDrvIns->iInstance, rc));
814 }
815 }
816 else
817 {
818 /* Getting new state failed, continue but log it */
819 LogRel(("HostSerial#%d: Getting status lines state failed with error %Rrc; continuing.\n", pDrvIns->iInstance, RTErrConvertFromWin32(GetLastError())));
820 }
821 }
822#endif
823
824 Log(("Read %d bytes.\n", cbRemaining));
825 pbBuffer = abBuffer;
826 }
827 else
828 {
829 /* Send data to the guest. */
830 size_t cbProcessed = cbRemaining;
831 rc = pThis->pDrvCharPort->pfnNotifyRead(pThis->pDrvCharPort, pbBuffer, &cbProcessed);
832 if (RT_SUCCESS(rc))
833 {
834 Assert(cbProcessed); Assert(cbProcessed <= cbRemaining);
835 pbBuffer += cbProcessed;
836 cbRemaining -= cbProcessed;
837 STAM_COUNTER_ADD(&pThis->StatBytesRead, cbProcessed);
838 }
839 else if (rc == VERR_TIMEOUT)
840 {
841 /* Normal case, just means that the guest didn't accept a new
842 * character before the timeout elapsed. Just retry. */
843 rc = VINF_SUCCESS;
844 }
845 else
846 {
847 LogRel(("HostSerial#%d: NotifyRead failed with %Rrc, terminating the worker thread.\n", pDrvIns->iInstance, rc));
848 rcThread = rc;
849 break;
850 }
851 }
852 }
853
854 return rcThread;
855}
856
857/**
858 * Unblock the receive thread so it can respond to a state change.
859 *
860 * @returns a VBox status code.
861 * @param pDrvIns The driver instance.
862 * @param pThread The receive thread.
863 */
864static DECLCALLBACK(int) drvHostSerialWakeupRecvThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
865{
866 RT_NOREF(pThread);
867 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
868#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
869 size_t cbIgnored;
870 return RTPipeWrite(pThis->hWakeupPipeW, "", 1, &cbIgnored);
871
872#elif defined(RT_OS_WINDOWS)
873 if (!SetEvent(pThis->hHaltEventSem))
874 return RTErrConvertFromWin32(GetLastError());
875 return VINF_SUCCESS;
876#else
877# error adapt me!
878#endif
879}
880
881#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
882/* -=-=-=-=- Monitor thread -=-=-=-=- */
883
884/**
885 * Monitor thread loop.
886 *
887 * This thread monitors the status lines and notifies the device
888 * if they change.
889 *
890 * @returns VINF_SUCCESS.
891 * @param pDrvIns PDM driver instance data.
892 * @param pThread The PDM thread data.
893 */
894static DECLCALLBACK(int) drvHostSerialMonitorThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
895{
896 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
897 unsigned long const uStatusLinesToCheck = TIOCM_CAR | TIOCM_RNG | TIOCM_DSR | TIOCM_CTS;
898#ifdef RT_OS_LINUX
899 bool fPoll = false;
900#endif
901
902 if (pThread->enmState == PDMTHREADSTATE_INITIALIZING)
903 return VINF_SUCCESS;
904
905 do
906 {
907 unsigned int statusLines;
908
909 /*
910 * Get the status line state.
911 */
912 int rcPsx = ioctl(RTFileToNative(pThis->hDeviceFile), TIOCMGET, &statusLines);
913 if (rcPsx < 0)
914 {
915 PDMDrvHlpVMSetRuntimeError(pDrvIns, 0 /*fFlags*/, "DrvHostSerialFail",
916 N_("Ioctl failed for serial host device '%s' (%Rrc). The device will not work properly"),
917 pThis->pszDevicePath, RTErrConvertFromErrno(errno));
918 break;
919 }
920
921 uint32_t newStatusLine = 0;
922
923 if (statusLines & TIOCM_CAR)
924 newStatusLine |= PDMICHARPORT_STATUS_LINES_DCD;
925 if (statusLines & TIOCM_RNG)
926 newStatusLine |= PDMICHARPORT_STATUS_LINES_RI;
927 if (statusLines & TIOCM_DSR)
928 newStatusLine |= PDMICHARPORT_STATUS_LINES_DSR;
929 if (statusLines & TIOCM_CTS)
930 newStatusLine |= PDMICHARPORT_STATUS_LINES_CTS;
931 pThis->pDrvCharPort->pfnNotifyStatusLinesChanged(pThis->pDrvCharPort, newStatusLine);
932
933 if (PDMTHREADSTATE_RUNNING != pThread->enmState)
934 break;
935
936# ifdef RT_OS_LINUX
937 /*
938 * Wait for status line change.
939 *
940 * XXX In Linux, if a thread calls tcsetattr while the monitor thread is
941 * waiting in ioctl for a modem status change then 8250.c wrongly disables
942 * modem irqs and so the monitor thread never gets released. The workaround
943 * is to send a signal after each tcsetattr.
944 *
945 * TIOCMIWAIT doesn't work for the DSR line with TIOCM_DSR set
946 * (see http://lxr.linux.no/#linux+v4.7/drivers/usb/class/cdc-acm.c#L949)
947 * However as it is possible to query the line state we will not just clear
948 * the TIOCM_DSR bit from the lines to check but resort to the polling
949 * approach just like on other hosts.
950 */
951 if (!fPoll)
952 {
953 rcPsx = ioctl(RTFileToNative(pThis->hDeviceFile), TIOCMIWAIT, uStatusLinesToCheck);
954 if (rcPsx < 0)
955 {
956 LogRel(("Serial#%u: Failed to wait for status line change, switch to polling\n", pDrvIns->iInstance));
957 fPoll = true;
958 pThis->fStatusLines = statusLines;
959 }
960 }
961 else
962 {
963 /* Poll for status line change. */
964 if (!((statusLines ^ pThis->fStatusLines) & uStatusLinesToCheck))
965 PDMR3ThreadSleep(pThread, 500); /* 0.5 sec */
966 pThis->fStatusLines = statusLines;
967 }
968# else
969 /* Poll for status line change. */
970 if (!((statusLines ^ pThis->fStatusLines) & uStatusLinesToCheck))
971 PDMR3ThreadSleep(pThread, 500); /* 0.5 sec */
972 pThis->fStatusLines = statusLines;
973# endif
974 } while (PDMTHREADSTATE_RUNNING == pThread->enmState);
975
976 return VINF_SUCCESS;
977}
978
979/**
980 * Unblock the monitor thread so it can respond to a state change.
981 * We need to execute this code exactly once during initialization.
982 * But we don't want to block --- therefore this dedicated thread.
983 *
984 * @returns a VBox status code.
985 * @param pDrvIns The driver instance.
986 * @param pThread The send thread.
987 */
988static DECLCALLBACK(int) drvHostSerialWakeupMonitorThread(PPDMDRVINS pDrvIns, PPDMTHREAD pThread)
989{
990# ifdef RT_OS_LINUX
991 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
992 int rc = VINF_SUCCESS;
993
994 rc = RTThreadPoke(pThread->Thread);
995 if (RT_FAILURE(rc))
996 PDMDrvHlpVMSetRuntimeError(pDrvIns, 0 /*fFlags*/, "DrvHostSerialFail",
997 N_("Suspending serial monitor thread failed for serial device '%s' (%Rrc). The shutdown may take longer than expected"),
998 pThis->pszDevicePath, RTErrConvertFromErrno(rc));
999
1000# else /* !RT_OS_LINUX*/
1001
1002 /* In polling mode there is nobody to wake up (PDMThread will cancel the sleep). */
1003 NOREF(pDrvIns);
1004 NOREF(pThread);
1005
1006# endif /* RT_OS_LINUX */
1007
1008 return VINF_SUCCESS;
1009}
1010#endif /* RT_OS_LINUX || RT_OS_DARWIN || RT_OS_SOLARIS */
1011
1012/**
1013 * Set the modem lines.
1014 *
1015 * @returns VBox status code
1016 * @param pInterface Pointer to the interface structure.
1017 * @param RequestToSend Set to true if this control line should be made active.
1018 * @param DataTerminalReady Set to true if this control line should be made active.
1019 */
1020static DECLCALLBACK(int) drvHostSerialSetModemLines(PPDMICHARCONNECTOR pInterface, bool RequestToSend, bool DataTerminalReady)
1021{
1022 PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
1023
1024#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1025 int modemStateSet = 0;
1026 int modemStateClear = 0;
1027
1028 if (RequestToSend)
1029 modemStateSet |= TIOCM_RTS;
1030 else
1031 modemStateClear |= TIOCM_RTS;
1032
1033 if (DataTerminalReady)
1034 modemStateSet |= TIOCM_DTR;
1035 else
1036 modemStateClear |= TIOCM_DTR;
1037
1038 if (modemStateSet)
1039 ioctl(RTFileToNative(pThis->hDeviceFile), TIOCMBIS, &modemStateSet);
1040
1041 if (modemStateClear)
1042 ioctl(RTFileToNative(pThis->hDeviceFile), TIOCMBIC, &modemStateClear);
1043
1044#elif defined(RT_OS_WINDOWS)
1045 if (RequestToSend)
1046 EscapeCommFunction(pThis->hDeviceFile, SETRTS);
1047 else
1048 EscapeCommFunction(pThis->hDeviceFile, CLRRTS);
1049
1050 if (DataTerminalReady)
1051 EscapeCommFunction(pThis->hDeviceFile, SETDTR);
1052 else
1053 EscapeCommFunction(pThis->hDeviceFile, CLRDTR);
1054
1055#endif
1056
1057 return VINF_SUCCESS;
1058}
1059
1060/**
1061 * Sets the TD line into break condition.
1062 *
1063 * @returns VBox status code.
1064 * @param pInterface Pointer to the interface structure containing the called function pointer.
1065 * @param fBreak Set to true to let the device send a break false to put into normal operation.
1066 * @thread Any thread.
1067 */
1068static DECLCALLBACK(int) drvHostSerialSetBreak(PPDMICHARCONNECTOR pInterface, bool fBreak)
1069{
1070 PDRVHOSTSERIAL pThis = PDMICHAR_2_DRVHOSTSERIAL(pInterface);
1071
1072#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1073 if (fBreak)
1074 ioctl(RTFileToNative(pThis->hDeviceFile), TIOCSBRK);
1075 else
1076 ioctl(RTFileToNative(pThis->hDeviceFile), TIOCCBRK);
1077
1078#elif defined(RT_OS_WINDOWS)
1079 if (fBreak)
1080 SetCommBreak(pThis->hDeviceFile);
1081 else
1082 ClearCommBreak(pThis->hDeviceFile);
1083#endif
1084
1085 return VINF_SUCCESS;
1086}
1087
1088/* -=-=-=-=- driver interface -=-=-=-=- */
1089
1090/**
1091 * Destruct a char driver instance.
1092 *
1093 * Most VM resources are freed by the VM. This callback is provided so that
1094 * any non-VM resources can be freed correctly.
1095 *
1096 * @param pDrvIns The driver instance data.
1097 */
1098static DECLCALLBACK(void) drvHostSerialDestruct(PPDMDRVINS pDrvIns)
1099{
1100 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
1101 LogFlow(("%s: iInstance=%d\n", __FUNCTION__, pDrvIns->iInstance));
1102 PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
1103
1104 /* Empty the send queue */
1105 if (pThis->SendSem != NIL_RTSEMEVENT)
1106 {
1107 RTSemEventDestroy(pThis->SendSem);
1108 pThis->SendSem = NIL_RTSEMEVENT;
1109 }
1110
1111#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1112
1113 int rc = RTPipeClose(pThis->hWakeupPipeW); AssertRC(rc);
1114 pThis->hWakeupPipeW = NIL_RTPIPE;
1115 rc = RTPipeClose(pThis->hWakeupPipeR); AssertRC(rc);
1116 pThis->hWakeupPipeR = NIL_RTPIPE;
1117
1118# if defined(RT_OS_DARWIN)
1119 if (pThis->hDeviceFileR != NIL_RTFILE)
1120 {
1121 if (pThis->hDeviceFileR != pThis->hDeviceFile)
1122 {
1123 rc = RTFileClose(pThis->hDeviceFileR);
1124 AssertRC(rc);
1125 }
1126 pThis->hDeviceFileR = NIL_RTFILE;
1127 }
1128# endif
1129 if (pThis->hDeviceFile != NIL_RTFILE)
1130 {
1131 rc = RTFileClose(pThis->hDeviceFile); AssertRC(rc);
1132 pThis->hDeviceFile = NIL_RTFILE;
1133 }
1134
1135#elif defined(RT_OS_WINDOWS)
1136 CloseHandle(pThis->hEventRecv);
1137 CloseHandle(pThis->hEventSend);
1138 CancelIo(pThis->hDeviceFile);
1139 CloseHandle(pThis->hDeviceFile);
1140
1141#endif
1142
1143 if (pThis->pszDevicePath)
1144 {
1145 MMR3HeapFree(pThis->pszDevicePath);
1146 pThis->pszDevicePath = NULL;
1147 }
1148}
1149
1150/**
1151 * Construct a char driver instance.
1152 *
1153 * @copydoc FNPDMDRVCONSTRUCT
1154 */
1155static DECLCALLBACK(int) drvHostSerialConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
1156{
1157 RT_NOREF1(fFlags);
1158 PDRVHOSTSERIAL pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTSERIAL);
1159 LogFlow(("%s: iInstance=%d\n", __FUNCTION__, pDrvIns->iInstance));
1160 PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
1161
1162 /*
1163 * Init basic data members and interfaces.
1164 */
1165#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1166 pThis->hDeviceFile = NIL_RTFILE;
1167# ifdef RT_OS_DARWIN
1168 pThis->hDeviceFileR = NIL_RTFILE;
1169# endif
1170 pThis->hWakeupPipeR = NIL_RTPIPE;
1171 pThis->hWakeupPipeW = NIL_RTPIPE;
1172#elif defined(RT_OS_WINDOWS)
1173 pThis->hEventRecv = INVALID_HANDLE_VALUE;
1174 pThis->hEventSend = INVALID_HANDLE_VALUE;
1175 pThis->hDeviceFile = INVALID_HANDLE_VALUE;
1176#endif
1177 pThis->SendSem = NIL_RTSEMEVENT;
1178 /* IBase. */
1179 pDrvIns->IBase.pfnQueryInterface = drvHostSerialQueryInterface;
1180 /* ICharConnector. */
1181 pThis->ICharConnector.pfnWrite = drvHostSerialWrite;
1182 pThis->ICharConnector.pfnSetParameters = drvHostSerialSetParameters;
1183 pThis->ICharConnector.pfnSetModemLines = drvHostSerialSetModemLines;
1184 pThis->ICharConnector.pfnSetBreak = drvHostSerialSetBreak;
1185
1186 /*
1187 * Query configuration.
1188 */
1189 /* Device */
1190 int rc = CFGMR3QueryStringAlloc(pCfg, "DevicePath", &pThis->pszDevicePath);
1191 if (RT_FAILURE(rc))
1192 {
1193 AssertMsgFailed(("Configuration error: query for \"DevicePath\" string returned %Rra.\n", rc));
1194 return rc;
1195 }
1196
1197 /*
1198 * Open the device
1199 */
1200#ifdef RT_OS_WINDOWS
1201
1202 pThis->hHaltEventSem = CreateEvent(NULL, FALSE, FALSE, NULL);
1203 AssertReturn(pThis->hHaltEventSem != NULL, VERR_NO_MEMORY);
1204
1205 pThis->hEventRecv = CreateEvent(NULL, FALSE, FALSE, NULL);
1206 AssertReturn(pThis->hEventRecv != NULL, VERR_NO_MEMORY);
1207
1208 pThis->hEventSend = CreateEvent(NULL, FALSE, FALSE, NULL);
1209 AssertReturn(pThis->hEventSend != NULL, VERR_NO_MEMORY);
1210
1211 HANDLE hFile = CreateFile(pThis->pszDevicePath,
1212 GENERIC_READ | GENERIC_WRITE,
1213 0, // must be opened with exclusive access
1214 NULL, // no SECURITY_ATTRIBUTES structure
1215 OPEN_EXISTING, // must use OPEN_EXISTING
1216 FILE_FLAG_OVERLAPPED, // overlapped I/O
1217 NULL); // no template file
1218 if (hFile == INVALID_HANDLE_VALUE)
1219 rc = RTErrConvertFromWin32(GetLastError());
1220 else
1221 {
1222 pThis->hDeviceFile = hFile;
1223 /* for overlapped read */
1224 if (!SetCommMask(hFile, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING | EV_RLSD))
1225 {
1226 LogRel(("HostSerial#%d: SetCommMask failed with error %d.\n", pDrvIns->iInstance, GetLastError()));
1227 return VERR_FILE_IO_ERROR;
1228 }
1229 rc = VINF_SUCCESS;
1230 }
1231
1232#else /* !RT_OS_WINDOWS */
1233
1234 uint32_t fOpen = RTFILE_O_READWRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE;
1235# ifdef RT_OS_LINUX
1236 /* This seems to be necessary on some Linux hosts, otherwise we hang here forever. */
1237 fOpen |= RTFILE_O_NON_BLOCK;
1238# endif
1239 rc = RTFileOpen(&pThis->hDeviceFile, pThis->pszDevicePath, fOpen);
1240# ifdef RT_OS_LINUX
1241 /* RTFILE_O_NON_BLOCK not supported? */
1242 if (rc == VERR_INVALID_PARAMETER)
1243 rc = RTFileOpen(&pThis->hDeviceFile, pThis->pszDevicePath, fOpen & ~RTFILE_O_NON_BLOCK);
1244# endif
1245# ifdef RT_OS_DARWIN
1246 if (RT_SUCCESS(rc))
1247 rc = RTFileOpen(&pThis->hDeviceFileR, pThis->pszDevicePath, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE);
1248# endif
1249
1250
1251#endif /* !RT_OS_WINDOWS */
1252
1253 if (RT_FAILURE(rc))
1254 {
1255 AssertMsgFailed(("Could not open host device %s, rc=%Rrc\n", pThis->pszDevicePath, rc));
1256 switch (rc)
1257 {
1258 case VERR_ACCESS_DENIED:
1259 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1260#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1261 N_("Cannot open host device '%s' for read/write access. Check the permissions "
1262 "of that device ('/bin/ls -l %s'): Most probably you need to be member "
1263 "of the device group. Make sure that you logout/login after changing "
1264 "the group settings of the current user"),
1265#else
1266 N_("Cannot open host device '%s' for read/write access. Check the permissions "
1267 "of that device"),
1268#endif
1269 pThis->pszDevicePath, pThis->pszDevicePath);
1270 default:
1271 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
1272 N_("Failed to open host device '%s'"),
1273 pThis->pszDevicePath);
1274 }
1275 }
1276
1277 /* Set to non blocking I/O */
1278#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1279
1280 fcntl(RTFileToNative(pThis->hDeviceFile), F_SETFL, O_NONBLOCK);
1281# ifdef RT_OS_DARWIN
1282 fcntl(RTFileToNative(pThis->hDeviceFileR), F_SETFL, O_NONBLOCK);
1283# endif
1284 rc = RTPipeCreate(&pThis->hWakeupPipeR, &pThis->hWakeupPipeW, 0 /*fFlags*/);
1285 AssertRCReturn(rc, rc);
1286
1287#elif defined(RT_OS_WINDOWS)
1288
1289 /* Set the COMMTIMEOUTS to get non blocking I/O */
1290 COMMTIMEOUTS comTimeout;
1291
1292 comTimeout.ReadIntervalTimeout = MAXDWORD;
1293 comTimeout.ReadTotalTimeoutMultiplier = 0;
1294 comTimeout.ReadTotalTimeoutConstant = 0;
1295 comTimeout.WriteTotalTimeoutMultiplier = 0;
1296 comTimeout.WriteTotalTimeoutConstant = 0;
1297
1298 SetCommTimeouts(pThis->hDeviceFile, &comTimeout);
1299
1300#endif
1301
1302 /*
1303 * Get the ICharPort interface of the above driver/device.
1304 */
1305 pThis->pDrvCharPort = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMICHARPORT);
1306 if (!pThis->pDrvCharPort)
1307 return PDMDrvHlpVMSetError(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE, RT_SRC_POS, N_("HostSerial#%d has no char port interface above"), pDrvIns->iInstance);
1308
1309 /*
1310 * Create the receive, send and monitor threads plus the related send semaphore.
1311 */
1312 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pRecvThread, pThis, drvHostSerialRecvThread, drvHostSerialWakeupRecvThread, 0, RTTHREADTYPE_IO, "SerRecv");
1313 if (RT_FAILURE(rc))
1314 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("HostSerial#%d cannot create receive thread"), pDrvIns->iInstance);
1315
1316 rc = RTSemEventCreate(&pThis->SendSem);
1317 AssertRC(rc);
1318
1319 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pSendThread, pThis, drvHostSerialSendThread, drvHostSerialWakeupSendThread, 0, RTTHREADTYPE_IO, "SerSend");
1320 if (RT_FAILURE(rc))
1321 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("HostSerial#%d cannot create send thread"), pDrvIns->iInstance);
1322
1323#if defined(RT_OS_LINUX) || defined(RT_OS_DARWIN) || defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD)
1324 /* Linux & darwin needs a separate thread which monitors the status lines. */
1325 int rcPsx = ioctl(RTFileToNative(pThis->hDeviceFile), TIOCMGET, &pThis->fStatusLines);
1326 if (!rcPsx)
1327 {
1328 rc = PDMDrvHlpThreadCreate(pDrvIns, &pThis->pMonitorThread, pThis, drvHostSerialMonitorThread, drvHostSerialWakeupMonitorThread, 0, RTTHREADTYPE_IO, "SerMon");
1329 if (RT_FAILURE(rc))
1330 return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("HostSerial#%d cannot create monitor thread"), pDrvIns->iInstance);
1331 }
1332 else
1333 {
1334 /* TIOCMGET is not supported for pseudo terminals so just silently skip it. */
1335 if (errno != ENOTTY)
1336 PDMDrvHlpVMSetRuntimeError(pDrvIns, 0 /*fFlags*/, "DrvHostSerialFail",
1337 N_("Trying to get the status lines state failed for serial host device '%s' (%Rrc). The device will not work properly"),
1338 pThis->pszDevicePath, RTErrConvertFromErrno(errno));
1339 }
1340#endif
1341
1342 /*
1343 * Register release statistics.
1344 */
1345 PDMDrvHlpSTAMRegisterF(pDrvIns, &pThis->StatBytesWritten, STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes written", "/Devices/HostSerial%d/Written", pDrvIns->iInstance);
1346 PDMDrvHlpSTAMRegisterF(pDrvIns, &pThis->StatBytesRead, STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes read", "/Devices/HostSerial%d/Read", pDrvIns->iInstance);
1347#ifdef RT_OS_DARWIN /* new Write code, not darwin specific. */
1348 PDMDrvHlpSTAMRegisterF(pDrvIns, &pThis->StatSendOverflows, STAMTYPE_COUNTER, STAMVISIBILITY_USED, STAMUNIT_BYTES, "Nr of bytes overflowed", "/Devices/HostSerial%d/SendOverflow", pDrvIns->iInstance);
1349#endif
1350
1351 return VINF_SUCCESS;
1352}
1353
1354/**
1355 * Char driver registration record.
1356 */
1357const PDMDRVREG g_DrvHostSerial =
1358{
1359 /* u32Version */
1360 PDM_DRVREG_VERSION,
1361 /* szName */
1362 "Host Serial",
1363 /* szRCMod */
1364 "",
1365 /* szR0Mod */
1366 "",
1367/* pszDescription */
1368 "Host serial driver.",
1369 /* fFlags */
1370 PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
1371 /* fClass. */
1372 PDM_DRVREG_CLASS_CHAR,
1373 /* cMaxInstances */
1374 ~0U,
1375 /* cbInstance */
1376 sizeof(DRVHOSTSERIAL),
1377 /* pfnConstruct */
1378 drvHostSerialConstruct,
1379 /* pfnDestruct */
1380 drvHostSerialDestruct,
1381 /* pfnRelocate */
1382 NULL,
1383 /* pfnIOCtl */
1384 NULL,
1385 /* pfnPowerOn */
1386 NULL,
1387 /* pfnReset */
1388 NULL,
1389 /* pfnSuspend */
1390 NULL,
1391 /* pfnResume */
1392 NULL,
1393 /* pfnAttach */
1394 NULL,
1395 /* pfnDetach */
1396 NULL,
1397 /* pfnPowerOff */
1398 NULL,
1399 /* pfnSoftReset */
1400 NULL,
1401 /* u32EndVersion */
1402 PDM_DRVREG_VERSION
1403};
1404
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