serialport-posix.cpp@ 71956

Last change on this file since 71956 was 71956, checked in by vboxsync, 7 years ago
Runtime/serialport-posix: Add custom baud rate support on Linux hosts
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1	/* $Id: serialport-posix.cpp 71956 2018-04-22 11:50:09Z vboxsync $ */
2	/** @file
3	* IPRT - Serial Port API, POSIX Implementation.
4	*/
5
6	/*
7	* Copyright (C) 2017-2018 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/serialport.h>
32	#include "internal/iprt.h"
33
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/cdefs.h>
37	#include <iprt/err.h>
38	#include <iprt/mem.h>
39	#include <iprt/string.h>
40	#include <iprt/thread.h>
41	#include <iprt/time.h>
42	#include "internal/magics.h"
43
44	#include <errno.h>
45	#ifdef RT_OS_SOLARIS
46	# include <sys/termios.h>
47	#else
48	# include <termios.h>
49	#endif
50	#include <sys/types.h>
51	#include <fcntl.h>
52	#include <string.h>
53	#include <unistd.h>
54	#ifdef RT_OS_DARWIN
55	# include <sys/poll.h>
56	#else
57	# include <sys/poll.h>
58	#endif
59	#include <sys/ioctl.h>
60	#include <pthread.h>
61
62	#ifdef RT_OS_LINUX
63	/*
64	* TIOCM_LOOP is not defined in the above header files for some reason but in asm/termios.h.
65	* But inclusion of this file however leads to compilation errors because of redefinition of some
66	* structs. That's why it is defined here until a better solution is found.
67	*/
68	# ifndef TIOCM_LOOP
69	# define TIOCM_LOOP 0x8000
70	# endif
71	/* For linux custom baudrate code we also need serial_struct */
72	# include <linux/serial.h>
73	#endif /* linux */
74
75	/** Define fallback if not supported. */
76	#if !defined(CMSPAR)
77	# define CMSPAR 0
78	#endif
79
80
81	/*********************************************************************************************************************************
82	* Structures and Typedefs *
83	*********************************************************************************************************************************/
84
85	/**
86	* Internal serial port state.
87	*/
88	typedef struct RTSERIALPORTINTERNAL
89	{
90	/** Magic value (RTSERIALPORT_MAGIC). */
91	uint32_t u32Magic;
92	/** Flags given while opening the serial port. */
93	uint32_t fOpenFlags;
94	/** The file descriptor of the serial port. */
95	int iFd;
96	/** The status line monitor thread if enabled. */
97	RTTHREAD hMonThrd;
98	/** Flag whether the monitoring thread should shutdown. */
99	volatile bool fMonThrdShutdown;
100	/** Reading end of wakeup pipe. */
101	int iFdPipeR;
102	/** Writing end of wakeup pipe. */
103	int iFdPipeW;
104	/** Event pending mask. */
105	volatile uint32_t fEvtsPending;
106	/** Flag whether we are in blocking or non blocking mode. */
107	bool fBlocking;
108	/** The current active config (we assume no one changes this behind our back). */
109	struct termios PortCfg;
110	/** Flag whether a custom baud rate was chosen (for hosts supporting this.). */
111	bool fBaudrateCust;
112	/** The custom baud rate. */
113	uint32_t uBaudRateCust;
114	} RTSERIALPORTINTERNAL;
115	/** Pointer to the internal serial port state. */
116	typedef RTSERIALPORTINTERNAL *PRTSERIALPORTINTERNAL;
117
118
119	/**
120	* Baud rate conversion table descriptor.
121	*/
122	typedef struct RTSERIALPORTBRATECONVDESC
123	{
124	/** The platform independent baud rate used by the RTSerialPort* API. */
125	uint32_t uBaudRateCfg;
126	/** The speed identifier used in the termios structure. */
127	speed_t iSpeedTermios;
128	} RTSERIALPORTBRATECONVDESC;
129	/** Pointer to a baud rate converions table descriptor. */
130	typedef RTSERIALPORTBRATECONVDESC *PRTSERIALPORTBRATECONVDESC;
131	/** Pointer to a const baud rate conversion table descriptor. */
132	typedef const RTSERIALPORTBRATECONVDESC *PCRTSERIALPORTBRATECONVDESC;
133
134
135	/*********************************************************************************************************************************
136	* Defined Constants And Macros *
137	*********************************************************************************************************************************/
138
139	/** The event poller was woken up due to an external interrupt. */
140	#define RTSERIALPORT_WAKEUP_PIPE_REASON_INTERRUPT 0x0
141	/** The event poller was woken up due to a change in the monitored status lines. */
142	#define RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED 0x1
143	/** The monitor thread encoutnered repeating errors querying the status lines and terminated. */
144	#define RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_MONITOR_FAILED 0x2
145
146
147	/*********************************************************************************************************************************
148	* Global variables *
149	*********************************************************************************************************************************/
150
151	/** The baud rate conversion table. */
152	static const RTSERIALPORTBRATECONVDESC s_rtSerialPortBaudrateConv[] =
153	{
154	{ 50, B50 },
155	{ 75, B75 },
156	{ 110, B110 },
157	{ 134, B134 },
158	{ 150, B150 },
159	{ 200, B200 },
160	{ 300, B300 },
161	{ 600, B600 },
162	{ 1200, B1200 },
163	{ 1800, B1800 },
164	{ 2400, B2400 },
165	{ 4800, B4800 },
166	{ 9600, B9600 },
167	{ 19200, B19200 },
168	{ 38400, B38400 },
169	{ 57600, B57600 },
170	{ 115200, B115200 }
171	};
172
173
174
175	/*********************************************************************************************************************************
176	* Internal Functions *
177	*********************************************************************************************************************************/
178
179	/**
180	* Converts the given termios speed identifier to the baud rate used in the API.
181	*
182	* @returns Baud rate or 0 if not a standard baud rate
183	*/
184	DECLINLINE(uint32_t) rtSerialPortGetBaudrateFromTermiosSpeed(speed_t enmSpeed)
185	{
186	for (unsigned i = 0; i < RT_ELEMENTS(s_rtSerialPortBaudrateConv); i++)
187	{
188	if (s_rtSerialPortBaudrateConv[i].iSpeedTermios == enmSpeed)
189	return s_rtSerialPortBaudrateConv[i].uBaudRateCfg;
190	}
191
192	return 0;
193	}
194
195
196	/**
197	* Converts the given baud rate to proper termios speed identifier.
198	*
199	* @returns Speed identifier if available or B0 if no matching speed for the baud rate
200	* could be found.
201	* @param uBaudRate The baud rate to convert.
202	* @param pfBaudrateCust Where to store the flag whether a custom baudrate was selected.
203	*/
204	DECLINLINE(speed_t) rtSerialPortGetTermiosSpeedFromBaudrate(uint32_t uBaudRate, bool *pfBaudrateCust)
205	{
206	*pfBaudrateCust = false;
207
208	for (unsigned i = 0; i < RT_ELEMENTS(s_rtSerialPortBaudrateConv); i++)
209	{
210	if (s_rtSerialPortBaudrateConv[i].uBaudRateCfg == uBaudRate)
211	return s_rtSerialPortBaudrateConv[i].iSpeedTermios;
212	}
213
214	#ifdef RT_OS_LINUX
215	*pfBaudrateCust = true;
216	return B38400;
217	#else
218	return B0;
219	#endif
220	}
221
222
223	/**
224	* Tries to set the default config on the given serial port.
225	*
226	* @returns IPRT status code.
227	* @param pThis The internal serial port instance data.
228	*/
229	static int rtSerialPortSetDefaultCfg(PRTSERIALPORTINTERNAL pThis)
230	{
231	pThis->fBaudrateCust = false;
232	pThis->uBaudRateCust = 0;
233	pThis->PortCfg.c_iflag = INPCK; /* Input parity checking. */
234	cfsetispeed(&pThis->PortCfg, B9600);
235	cfsetospeed(&pThis->PortCfg, B9600);
236	pThis->PortCfg.c_cflag \|= CS8 \| CLOCAL; /* 8 data bits, ignore modem control lines. */
237	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_READ)
238	pThis->PortCfg.c_cflag \|= CREAD; /* Enable receiver. */
239
240	/* Set to raw input mode. */
241	pThis->PortCfg.c_lflag &= ~(ICANON \| ECHO \| ECHOE \| ECHONL \| ECHOK \| ISIG \| IEXTEN);
242	pThis->PortCfg.c_cc[VMIN] = 0; /* Achieve non-blocking behavior. */
243	pThis->PortCfg.c_cc[VTIME] = 0;
244
245	int rc = VINF_SUCCESS;
246	int rcPsx = tcflush(pThis->iFd, TCIOFLUSH);
247	if (!rcPsx)
248	{
249	rcPsx = tcsetattr(pThis->iFd, TCSANOW, &pThis->PortCfg);
250	if (rcPsx == -1)
251	rc = RTErrConvertFromErrno(errno);
252
253	if (RT_SUCCESS(rc))
254	{
255	#ifdef RT_OS_LINUX
256	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_ENABLE_LOOPBACK)
257	{
258	int fTiocmSet = TIOCM_LOOP;
259	rcPsx = ioctl(pThis->iFd, TIOCMBIS, &fTiocmSet);
260	if (rcPsx == -1)
261	rc = RTErrConvertFromErrno(errno);
262	}
263	else
264	{
265	/* Make sure it is clear. */
266	int fTiocmClear = TIOCM_LOOP;
267	rcPsx = ioctl(pThis->iFd, TIOCMBIC, &fTiocmClear);
268	if (rcPsx == -1)
269	rc = RTErrConvertFromErrno(errno);
270	}
271	#else
272	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_ENABLE_LOOPBACK)
273	return VERR_NOT_SUPPORTED;
274	#endif
275	}
276	}
277	else
278	rc = RTErrConvertFromErrno(errno);
279
280	return rc;
281	}
282
283
284	/**
285	* Converts the given serial port config to the appropriate termios counterpart.
286	*
287	* @returns IPRT status code.
288	* @param pThis The internal serial port instance data.
289	* @param pCfg Pointer to the serial port config descriptor.
290	* @param pTermios Pointer to the termios structure to fill.
291	* @param pfBaudrateCust Where to store the flag whether a custom baudrate was selected.
292	* @param pErrInfo Additional error to be set when the conversion fails.
293	*/
294	static int rtSerialPortCfg2Termios(PRTSERIALPORTINTERNAL pThis, PCRTSERIALPORTCFG pCfg, struct termios *pTermios,
295	bool *pfBaudrateCust, PRTERRINFO pErrInfo)
296	{
297	RT_NOREF(pErrInfo); /** @todo Make use of the error info. */
298	speed_t enmSpeed = rtSerialPortGetTermiosSpeedFromBaudrate(pCfg->uBaudRate, pfBaudrateCust);
299	if (enmSpeed != B0)
300	{
301	tcflag_t const fCFlagMask = (CS5 \| CS6 \| CS7 \| CS8 \| CSTOPB \| PARENB \| PARODD \| CMSPAR);
302	tcflag_t fCFlagNew = 0;
303
304	switch (pCfg->enmDataBitCount)
305	{
306	case RTSERIALPORTDATABITS_5BITS:
307	fCFlagNew \|= CS5;
308	break;
309	case RTSERIALPORTDATABITS_6BITS:
310	fCFlagNew \|= CS6;
311	break;
312	case RTSERIALPORTDATABITS_7BITS:
313	fCFlagNew \|= CS7;
314	break;
315	case RTSERIALPORTDATABITS_8BITS:
316	fCFlagNew \|= CS8;
317	break;
318	default:
319	AssertFailed();
320	return VERR_INVALID_PARAMETER;
321	}
322
323	switch (pCfg->enmParity)
324	{
325	case RTSERIALPORTPARITY_NONE:
326	break;
327	case RTSERIALPORTPARITY_EVEN:
328	fCFlagNew \|= PARENB;
329	break;
330	case RTSERIALPORTPARITY_ODD:
331	fCFlagNew \|= PARENB \| PARODD;
332	break;
333	#if CMSPAR != 0
334	case RTSERIALPORTPARITY_MARK:
335	fCFlagNew \|= PARENB \| CMSPAR \| PARODD;
336	break;
337	case RTSERIALPORTPARITY_SPACE:
338	fCFlagNew \|= PARENB \| CMSPAR;
339	break;
340	#else
341	case RTSERIALPORTPARITY_MARK:
342	case RTSERIALPORTPARITY_SPACE:
343	return VERR_NOT_SUPPORTED;
344	#endif
345	default:
346	AssertFailed();
347	return VERR_INVALID_PARAMETER;
348	}
349
350	switch (pCfg->enmStopBitCount)
351	{
352	case RTSERIALPORTSTOPBITS_ONE:
353	break;
354	case RTSERIALPORTSTOPBITS_ONEPOINTFIVE:
355	if (pCfg->enmDataBitCount == RTSERIALPORTDATABITS_5BITS)
356	fCFlagNew \|= CSTOPB;
357	else
358	return VERR_NOT_SUPPORTED;
359	break;
360	case RTSERIALPORTSTOPBITS_TWO:
361	if (pCfg->enmDataBitCount != RTSERIALPORTDATABITS_5BITS)
362	fCFlagNew \|= CSTOPB;
363	else
364	return VERR_NOT_SUPPORTED;
365	break;
366	default:
367	AssertFailed();
368	return VERR_INVALID_PARAMETER;
369	}
370
371	/* Assign new flags. */
372	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_READ)
373	pTermios->c_cflag \|= CREAD; /* Enable receiver. */
374	pTermios->c_cflag = (pTermios->c_cflag & ~fCFlagMask) \| fCFlagNew;
375	pTermios->c_lflag &= ~(ICANON \| ECHO \| ECHOE \| ECHONL \| ECHOK \| ISIG \| IEXTEN);
376	pTermios->c_iflag = INPCK; /* Input parity checking. */
377	pTermios->c_cc[VMIN] = 0; /* Achieve non-blocking behavior. */
378	pTermios->c_cc[VTIME] = 0;
379	cfsetispeed(pTermios, enmSpeed);
380	cfsetospeed(pTermios, enmSpeed);
381	}
382	else
383	return VERR_SERIALPORT_INVALID_BAUDRATE;
384
385	return VINF_SUCCESS;
386	}
387
388
389	/**
390	* Converts the given termios structure to an appropriate serial port config.
391	*
392	* @returns IPRT status code.
393	* @param pThis The internal serial port instance data.
394	* @param pTermios The termios structure to convert.
395	* @param pCfg The serial port config to fill in.
396	*/
397	static int rtSerialPortTermios2Cfg(PRTSERIALPORTINTERNAL pThis, struct termios *pTermios, PRTSERIALPORTCFG pCfg)
398	{
399	int rc = VINF_SUCCESS;
400	bool f5DataBits = false;
401	speed_t enmSpeedIn = cfgetispeed(pTermios);
402	Assert(enmSpeedIn == cfgetospeed(pTermios)); /* Should always be the same. */
403
404	if (!pThis->fBaudrateCust)
405	{
406	pCfg->uBaudRate = rtSerialPortGetBaudrateFromTermiosSpeed(enmSpeedIn);
407	if (!pCfg->uBaudRate)
408	rc = VERR_SERIALPORT_INVALID_BAUDRATE;
409	}
410	else
411	pCfg->uBaudRate = pThis->uBaudRateCust;
412
413	switch (pTermios->c_cflag & CSIZE)
414	{
415	case CS5:
416	pCfg->enmDataBitCount = RTSERIALPORTDATABITS_5BITS;
417	f5DataBits = true;
418	break;
419	case CS6:
420	pCfg->enmDataBitCount = RTSERIALPORTDATABITS_6BITS;
421	break;
422	case CS7:
423	pCfg->enmDataBitCount = RTSERIALPORTDATABITS_7BITS;
424	break;
425	case CS8:
426	pCfg->enmDataBitCount = RTSERIALPORTDATABITS_8BITS;
427	break;
428	default:
429	AssertFailed(); /* Should not happen. */
430	pCfg->enmDataBitCount = RTSERIALPORTDATABITS_INVALID;
431	rc = RT_FAILURE(rc) ? rc : VERR_INVALID_PARAMETER;
432	}
433
434	/* Convert parity. */
435	if (pTermios->c_cflag & PARENB)
436	{
437	/*
438	* CMSPAR is not supported on all systems, especially OS X. As configuring
439	* mark/space parity there is not supported and we start from a known config
440	* when opening the serial port it is not required to check for this here.
441	*/
442	#if CMSPAR == 0
443	bool fCmsParSet = RT_BOOL(pTermios->c_cflag & CMSPAR);
444	#else
445	bool fCmsParSet = false;
446	#endif
447	if (pTermios->c_cflag & PARODD)
448	pCfg->enmParity = fCmsParSet ? RTSERIALPORTPARITY_MARK : RTSERIALPORTPARITY_ODD;
449	else
450	pCfg->enmParity = fCmsParSet ? RTSERIALPORTPARITY_SPACE: RTSERIALPORTPARITY_EVEN;
451	}
452	else
453	pCfg->enmParity = RTSERIALPORTPARITY_NONE;
454
455	/*
456	* 1.5 stop bits are used with a data count of 5 bits when a UART derived from the 8250
457	* is used.
458	*/
459	if (pTermios->c_cflag & CSTOPB)
460	pCfg->enmStopBitCount = f5DataBits ? RTSERIALPORTSTOPBITS_ONEPOINTFIVE : RTSERIALPORTSTOPBITS_TWO;
461	else
462	pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_ONE;
463
464	return rc;
465	}
466
467
468	/**
469	* Wakes up any thread polling for a serial port event with the given reason.
470	*
471	* @returns IPRT status code.
472	* @param pThis The internal serial port instance data.
473	* @param bWakeupReason The wakeup reason to pass to the event poller.
474	*/
475	DECLINLINE(int) rtSerialPortWakeupEvtPoller(PRTSERIALPORTINTERNAL pThis, uint8_t bWakeupReason)
476	{
477	int rcPsx = write(pThis->iFdPipeW, &bWakeupReason, 1);
478	if (rcPsx != 1)
479	return RTErrConvertFromErrno(errno);
480
481	return VINF_SUCCESS;
482	}
483
484
485	/**
486	* The status line monitor thread worker.
487	*
488	* @returns IPRT status code.
489	* @param ThreadSelf Thread handle to this thread.
490	* @param pvUser User argument.
491	*/
492	static DECLCALLBACK(int) rtSerialPortStsLineMonitorThrd(RTTHREAD hThreadSelf, void *pvUser)
493	{
494	RT_NOREF(hThreadSelf);
495	PRTSERIALPORTINTERNAL pThis = (PRTSERIALPORTINTERNAL)pvUser;
496	unsigned long const fStsLinesChk = TIOCM_CAR \| TIOCM_RNG \| TIOCM_DSR \| TIOCM_CTS;
497	int rc = VINF_SUCCESS;
498	uint32_t fStsLinesOld = 0;
499	uint32_t cStsLineGetErrors = 0;
500	#ifdef RT_OS_LINUX
501	bool fPoll = false;
502	#endif
503
504	RTThreadUserSignal(hThreadSelf);
505
506	int rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLinesOld);
507	if (rcPsx == -1)
508	{
509	ASMAtomicXchgBool(&pThis->fMonThrdShutdown, true);
510	return RTErrConvertFromErrno(errno);
511	}
512
513	while ( !pThis->fMonThrdShutdown
514	&& RT_SUCCESS(rc))
515	{
516	# ifdef RT_OS_LINUX
517	/*
518	* Wait for status line change.
519	*
520	* XXX In Linux, if a thread calls tcsetattr while the monitor thread is
521	* waiting in ioctl for a modem status change then 8250.c wrongly disables
522	* modem irqs and so the monitor thread never gets released. The workaround
523	* is to send a signal after each tcsetattr.
524	*
525	* TIOCMIWAIT doesn't work for the DSR line with TIOCM_DSR set
526	* (see http://lxr.linux.no/#linux+v4.7/drivers/usb/class/cdc-acm.c#L949)
527	* However as it is possible to query the line state we will not just clear
528	* the TIOCM_DSR bit from the lines to check but resort to the polling
529	* approach just like on other hosts.
530	*/
531	if (!fPoll)
532	{
533	rcPsx = ioctl(pThis->iFd, TIOCMIWAIT, fStsLinesChk);
534	if (!rcPsx)
535	{
536	rc = rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED);
537	if (RT_FAILURE(rc))
538	break;
539	}
540	else if (rcPsx == -1 && errno != EINTR)
541	fPoll = true;
542	}
543	else
544	#endif
545	{
546	uint32_t fStsLines = 0;
547	rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLines);
548	if (!rcPsx)
549	{
550	cStsLineGetErrors = 0; /* Reset the error counter once we had one successful query. */
551
552	if (((fStsLines ^ fStsLinesOld) & fStsLinesChk))
553	{
554	rc = rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED);
555	if (RT_FAILURE(rc))
556	break;
557
558	fStsLinesOld = fStsLines;
559	}
560	else /* No change, sleep for a bit. */
561	RTThreadSleep(100 /ms/);
562	}
563	else if (rcPsx == -1 && errno != EINTR)
564	{
565	/*
566	* If querying the status line fails too often we have to shut down the
567	* thread and notify the user of the serial port.
568	*/
569	if (cStsLineGetErrors++ >= 10)
570	{
571	rc = RTErrConvertFromErrno(errno);
572	rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_MONITOR_FAILED);
573	break;
574	}
575
576	RTThreadSleep(100 /ms/);
577	}
578	}
579	}
580
581	ASMAtomicXchgBool(&pThis->fMonThrdShutdown, true);
582	return rc;
583	}
584
585
586	/**
587	* Creates the status line monitoring thread.
588	*
589	* @returns IPRT status code.
590	* @param pThis The internal serial port instance data.
591	*/
592	static int rtSerialPortMonitorThreadCreate(PRTSERIALPORTINTERNAL pThis)
593	{
594	int rc = VINF_SUCCESS;
595
596	/*
597	* Check whether querying the status lines is supported at all, pseudo terminals
598	* don't support it so an error returned in that case.
599	*/
600	uint32_t fStsLines = 0;
601	int rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLines);
602	if (!rcPsx)
603	{
604	pThis->fMonThrdShutdown = false;
605	rc = RTThreadCreate(&pThis->hMonThrd, rtSerialPortStsLineMonitorThrd, pThis, 0 /cbStack/,
606	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "IPRT-SerPortMon");
607	if (RT_SUCCESS(rc))
608	{
609	/* Wait for the thread to start up. */
610	rc = RTThreadUserWait(pThis->hMonThrd, 20*RT_MS_1SEC);
611	if ( rc == VERR_TIMEOUT
612	\|\| pThis->fMonThrdShutdown)
613	{
614	/* Startup failed, try to reap the thread. */
615	int rcThrd;
616	rc = RTThreadWait(pThis->hMonThrd, 20*RT_MS_1SEC, &rcThrd);
617	if (RT_SUCCESS(rc))
618	rc = rcThrd;
619	else
620	rc = VERR_INTERNAL_ERROR;
621	/* The thread is lost otherwise. */
622	}
623	}
624	}
625	else if (errno == ENOTTY)
626	rc = VERR_NOT_SUPPORTED;
627	else
628	rc = RTErrConvertFromErrno(errno);
629
630	return rc;
631	}
632
633
634	/**
635	* Shuts down the status line monitor thread.
636	*
637	* @returns nothing.
638	* @param pThis The internal serial port instance data.
639	*/
640	static void rtSerialPortMonitorThreadShutdown(PRTSERIALPORTINTERNAL pThis)
641	{
642	bool fShutDown = ASMAtomicXchgBool(&pThis->fMonThrdShutdown, true);
643	if (!fShutDown)
644	{
645	int rc = RTThreadPoke(pThis->hMonThrd);
646	AssertRC(rc);
647	}
648
649	int rcThrd = VINF_SUCCESS;
650	int rc = RTThreadWait(pThis->hMonThrd, 20*RT_MS_1SEC, &rcThrd);
651	AssertRC(rc);
652	AssertRC(rcThrd);
653	}
654
655
656	/**
657	* The slow path of rtSerialPortSwitchBlockingMode that does the actual switching.
658	*
659	* @returns IPRT status code.
660	* @param pThis The internal serial port instance data.
661	* @param fBlocking The desired mode of operation.
662	* @remarks Do not call directly.
663	*/
664	static int rtSerialPortSwitchBlockingModeSlow(PRTSERIALPORTINTERNAL pThis, bool fBlocking)
665	{
666	int fFlags = fcntl(pThis->iFd, F_GETFL, 0);
667	if (fFlags == -1)
668	return RTErrConvertFromErrno(errno);
669
670	if (fBlocking)
671	fFlags &= ~O_NONBLOCK;
672	else
673	fFlags \|= O_NONBLOCK;
674	if (fcntl(pThis->iFd, F_SETFL, fFlags) == -1)
675	return RTErrConvertFromErrno(errno);
676
677	pThis->fBlocking = fBlocking;
678	return VINF_SUCCESS;
679	}
680
681
682	/**
683	* Switches the serial port to the desired blocking mode if necessary.
684	*
685	* @returns IPRT status code.
686	* @param pThis The internal serial port instance data.
687	* @param fBlocking The desired mode of operation.
688	*/
689	DECLINLINE(int) rtSerialPortSwitchBlockingMode(PRTSERIALPORTINTERNAL pThis, bool fBlocking)
690	{
691	if (pThis->fBlocking != fBlocking)
692	return rtSerialPortSwitchBlockingModeSlow(pThis, fBlocking);
693	return VINF_SUCCESS;
694	}
695
696
697	RTDECL(int) RTSerialPortOpen(PRTSERIALPORT phSerialPort, const char *pszPortAddress, uint32_t fFlags)
698	{
699	AssertPtrReturn(phSerialPort, VERR_INVALID_POINTER);
700	AssertReturn(VALID_PTR(pszPortAddress) && *pszPortAddress != '\0', VERR_INVALID_PARAMETER);
701	AssertReturn(!(fFlags & ~RTSERIALPORT_OPEN_F_VALID_MASK), VERR_INVALID_PARAMETER);
702	AssertReturn((fFlags & RTSERIALPORT_OPEN_F_READ) \|\| (fFlags & RTSERIALPORT_OPEN_F_WRITE),
703	VERR_INVALID_PARAMETER);
704
705	int rc = VINF_SUCCESS;
706	PRTSERIALPORTINTERNAL pThis = (PRTSERIALPORTINTERNAL)RTMemAllocZ(sizeof(*pThis));
707	if (pThis)
708	{
709	int fPsxFlags = O_NOCTTY \| O_NONBLOCK;
710
711	if ((fFlags & RTSERIALPORT_OPEN_F_READ) && !(fFlags & RTSERIALPORT_OPEN_F_WRITE))
712	fPsxFlags \|= O_RDONLY;
713	else if (!(fFlags & RTSERIALPORT_OPEN_F_READ) && (fFlags & RTSERIALPORT_OPEN_F_WRITE))
714	fPsxFlags \|= O_WRONLY;
715	else
716	fPsxFlags \|= O_RDWR;
717
718	pThis->u32Magic = RTSERIALPORT_MAGIC;
719	pThis->fOpenFlags = fFlags;
720	pThis->fEvtsPending = 0;
721	pThis->iFd = open(pszPortAddress, fPsxFlags);
722	pThis->fBlocking = false;
723	if (pThis->iFd != -1)
724	{
725	/* Create wakeup pipe for the event API. */
726	int aPipeFds[2];
727	int rcPsx = pipe(&aPipeFds[0]);
728	if (!rcPsx)
729	{
730	/* Make the pipes close on exec. */
731	pThis->iFdPipeR = aPipeFds[0];
732	pThis->iFdPipeW = aPipeFds[1];
733
734	if (fcntl(pThis->iFdPipeR, F_SETFD, FD_CLOEXEC))
735	rc = RTErrConvertFromErrno(errno);
736
737	if ( RT_SUCCESS(rc)
738	&& fcntl(pThis->iFdPipeW, F_SETFD, FD_CLOEXEC))
739	rc = RTErrConvertFromErrno(errno);
740
741	if (RT_SUCCESS(rc))
742	{
743	rc = rtSerialPortSetDefaultCfg(pThis);
744	if ( RT_SUCCESS(rc)
745	&& (fFlags & RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING))
746	rc = rtSerialPortMonitorThreadCreate(pThis);
747
748	if (RT_SUCCESS(rc))
749	{
750	*phSerialPort = pThis;
751	return VINF_SUCCESS;
752	}
753	}
754
755	close(pThis->iFdPipeR);
756	close(pThis->iFdPipeW);
757	}
758	else
759	rc = RTErrConvertFromErrno(errno);
760
761	close(pThis->iFd);
762	}
763	else
764	rc = RTErrConvertFromErrno(errno);
765
766	RTMemFree(pThis);
767	}
768	else
769	rc = VERR_NO_MEMORY;
770
771	return rc;
772	}
773
774
775	RTDECL(int) RTSerialPortClose(RTSERIALPORT hSerialPort)
776	{
777	PRTSERIALPORTINTERNAL pThis = hSerialPort;
778	if (pThis == NIL_RTSERIALPORT)
779	return VINF_SUCCESS;
780	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
781	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
782
783	/*
784	* Do the cleanup.
785	*/
786	AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSERIALPORT_MAGIC_DEAD, RTSERIALPORT_MAGIC), VERR_INVALID_HANDLE);
787
788	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING)
789	rtSerialPortMonitorThreadShutdown(pThis);
790
791	close(pThis->iFd);
792	close(pThis->iFdPipeR);
793	close(pThis->iFdPipeW);
794	RTMemFree(pThis);
795	return VINF_SUCCESS;
796	}
797
798
799	RTDECL(RTHCINTPTR) RTSerialPortToNative(RTSERIALPORT hSerialPort)
800	{
801	PRTSERIALPORTINTERNAL pThis = hSerialPort;
802	AssertPtrReturn(pThis, -1);
803	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, -1);
804
805	return pThis->iFd;
806	}
807
808
809	RTDECL(int) RTSerialPortRead(RTSERIALPORT hSerialPort, void pvBuf, size_t cbToRead, size_t pcbRead)
810	{
811	PRTSERIALPORTINTERNAL pThis = hSerialPort;
812	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
813	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
814	AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
815	AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER);
816
817	int rc = rtSerialPortSwitchBlockingMode(pThis, true);
818	if (RT_SUCCESS(rc))
819	{
820	/*
821	* Attempt read.
822	*/
823	ssize_t cbRead = read(pThis->iFd, pvBuf, cbToRead);
824	if (cbRead >= 0)
825	{
826	if (pcbRead)
827	/* caller can handle partial read. */
828	*pcbRead = cbRead;
829	else
830	{
831	/* Caller expects all to be read. */
832	while ((ssize_t)cbToRead > cbRead)
833	{
834	ssize_t cbReadPart = read(pThis->iFd, (uint8_t *)pvBuf + cbRead, cbToRead - cbRead);
835	if (cbReadPart < 0)
836	return RTErrConvertFromErrno(errno);
837
838	cbRead += cbReadPart;
839	}
840	}
841	}
842	else
843	rc = RTErrConvertFromErrno(errno);
844	}
845
846	return rc;
847	}
848
849
850	RTDECL(int) RTSerialPortReadNB(RTSERIALPORT hSerialPort, void pvBuf, size_t cbToRead, size_t pcbRead)
851	{
852	PRTSERIALPORTINTERNAL pThis = hSerialPort;
853	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
854	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
855	AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
856	AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER);
857	AssertPtrReturn(pcbRead, VERR_INVALID_POINTER);
858
859	*pcbRead = 0;
860
861	int rc = rtSerialPortSwitchBlockingMode(pThis, false);
862	if (RT_SUCCESS(rc))
863	{
864	ssize_t cbThisRead = read(pThis->iFd, pvBuf, cbToRead);
865	if (cbThisRead > 0)
866	{
867	/*
868	* The read data needs to be scanned for the BREAK condition marker encoded in the data stream,
869	* if break detection was enabled during open.
870	*/
871	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_DETECT_BREAK_CONDITION)
872	{ /** @todo */ }
873
874	*pcbRead = cbThisRead;
875	}
876	else if (cbThisRead == 0 \|\| errno == EAGAIN \|\| errno == EWOULDBLOCK)
877	rc = VINF_TRY_AGAIN;
878	else
879	rc = RTErrConvertFromErrno(errno);
880	}
881
882	return rc;
883	}
884
885
886	RTDECL(int) RTSerialPortWrite(RTSERIALPORT hSerialPort, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
887	{
888	PRTSERIALPORTINTERNAL pThis = hSerialPort;
889	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
890	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
891	AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
892	AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER);
893
894	int rc = rtSerialPortSwitchBlockingMode(pThis, true);
895	if (RT_SUCCESS(rc))
896	{
897	/*
898	* Attempt write.
899	*/
900	ssize_t cbWritten = write(pThis->iFd, pvBuf, cbToWrite);
901	if (cbWritten >= 0)
902	{
903	if (pcbWritten)
904	/* caller can handle partial write. */
905	*pcbWritten = cbWritten;
906	else
907	{
908	/* Caller expects all to be written. */
909	while ((ssize_t)cbToWrite > cbWritten)
910	{
911	ssize_t cbWrittenPart = write(pThis->iFd, (const uint8_t *)pvBuf + cbWritten, cbToWrite - cbWritten);
912	if (cbWrittenPart < 0)
913	return RTErrConvertFromErrno(errno);
914	cbWritten += cbWrittenPart;
915	}
916	}
917	}
918	}
919
920	return rc;
921	}
922
923
924	RTDECL(int) RTSerialPortWriteNB(RTSERIALPORT hSerialPort, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
925	{
926	PRTSERIALPORTINTERNAL pThis = hSerialPort;
927	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
928	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
929	AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
930	AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER);
931	AssertPtrReturn(pcbWritten, VERR_INVALID_POINTER);
932
933	*pcbWritten = 0;
934
935	int rc = rtSerialPortSwitchBlockingMode(pThis, false);
936	if (RT_SUCCESS(rc))
937	{
938	ssize_t cbThisWrite = write(pThis->iFd, pvBuf, cbToWrite);
939	if (cbThisWrite > 0)
940	*pcbWritten = cbThisWrite;
941	else if (cbThisWrite == 0 \|\| errno == EAGAIN \|\| errno == EWOULDBLOCK)
942	rc = VINF_TRY_AGAIN;
943	else
944	rc = RTErrConvertFromErrno(errno);
945	}
946
947	return rc;
948	}
949
950
951	RTDECL(int) RTSerialPortCfgQueryCurrent(RTSERIALPORT hSerialPort, PRTSERIALPORTCFG pCfg)
952	{
953	PRTSERIALPORTINTERNAL pThis = hSerialPort;
954	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
955	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
956
957	return rtSerialPortTermios2Cfg(pThis, &pThis->PortCfg, pCfg);
958	}
959
960
961	RTDECL(int) RTSerialPortCfgSet(RTSERIALPORT hSerialPort, PCRTSERIALPORTCFG pCfg, PRTERRINFO pErrInfo)
962	{
963	PRTSERIALPORTINTERNAL pThis = hSerialPort;
964	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
965	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
966
967	struct termios PortCfgNew; RT_ZERO(PortCfgNew);
968	bool fBaudrateCust = false;
969	int rc = rtSerialPortCfg2Termios(pThis, pCfg, &PortCfgNew, &fBaudrateCust, pErrInfo);
970	if (RT_SUCCESS(rc))
971	{
972	int rcPsx = tcflush(pThis->iFd, TCIOFLUSH);
973	if (!rcPsx)
974	{
975	#ifdef RT_OS_LINUX
976	if (fBaudrateCust)
977	{
978	struct serial_struct SerLnx;
979	rcPsx = ioctl(pThis->iFd, TIOCGSERIAL, &SerLnx);
980	if (!rcPsx)
981	{
982	SerLnx.custom_divisor = SerLnx.baud_base / pCfg->uBaudRate;
983	if (!SerLnx.custom_divisor)
984	SerLnx.custom_divisor = 1;
985	SerLnx.flags &= ~ASYNC_SPD_MASK;
986	SerLnx.flags \|= ASYNC_SPD_CUST;
987	rcPsx = ioctl(pThis->iFd, TIOCSSERIAL, &SerLnx);
988	}
989	}
990	#else /* !RT_OS_LINUX */
991	/* Hosts not supporting custom baud rates should already fail in rtSerialPortCfg2Termios(). */
992	AssertMsgFailed(("Should not get here!\n"));
993	#endif /* !RT_OS_LINUX */
994	pThis->fBaudrateCust = fBaudrateCust;
995	pThis->uBaudRateCust = pCfg->uBaudRate;
996
997	if (!rcPsx)
998	rcPsx = tcsetattr(pThis->iFd, TCSANOW, &PortCfgNew);
999	if (rcPsx == -1)
1000	rc = RTErrConvertFromErrno(errno);
1001	else
1002	memcpy(&pThis->PortCfg, &PortCfgNew, sizeof(struct termios));
1003
1004	#ifdef RT_OS_LINUX
1005	/*
1006	* XXX In Linux, if a thread calls tcsetattr while the monitor thread is
1007	* waiting in ioctl for a modem status change then 8250.c wrongly disables
1008	* modem irqs and so the monitor thread never gets released. The workaround
1009	* is to send a signal after each tcsetattr.
1010	*/
1011	if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING)
1012	RTThreadPoke(pThis->hMonThrd);
1013	#endif
1014	}
1015	else
1016	rc = RTErrConvertFromErrno(errno);
1017	}
1018
1019	return rc;
1020	}
1021
1022
1023	RTDECL(int) RTSerialPortEvtPoll(RTSERIALPORT hSerialPort, uint32_t fEvtMask, uint32_t *pfEvtsRecv,
1024	RTMSINTERVAL msTimeout)
1025	{
1026	PRTSERIALPORTINTERNAL pThis = hSerialPort;
1027	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
1028	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
1029	AssertReturn(!(fEvtMask & ~RTSERIALPORT_EVT_F_VALID_MASK), VERR_INVALID_PARAMETER);
1030	AssertPtrReturn(pfEvtsRecv, VERR_INVALID_POINTER);
1031
1032	*pfEvtsRecv = 0;
1033
1034	fEvtMask \|= RTSERIALPORT_EVT_F_STATUS_LINE_MONITOR_FAILED; /* This will be reported always, no matter what the caller wants. */
1035
1036	/* Return early if there are events pending from previous calls which weren't fetched yet. */
1037	for (;;)
1038	{
1039	uint32_t fEvtsPending = ASMAtomicReadU32(&pThis->fEvtsPending);
1040	if (fEvtsPending & fEvtMask)
1041	{
1042	*pfEvtsRecv = fEvtsPending & fEvtMask;
1043	/* Write back, repeat the whole procedure if someone else raced us. */
1044	if (ASMAtomicCmpXchgU32(&pThis->fEvtsPending, fEvtsPending & ~fEvtMask, fEvtsPending))
1045	return VINF_SUCCESS;
1046	}
1047	else
1048	break;
1049	}
1050
1051	int rc = rtSerialPortSwitchBlockingMode(pThis, false);
1052	if (RT_SUCCESS(rc))
1053	{
1054	struct pollfd aPollFds[2]; RT_ZERO(aPollFds);
1055	aPollFds[0].fd = pThis->iFd;
1056	aPollFds[0].events = POLLERR \| POLLHUP;
1057	aPollFds[0].revents = 0;
1058	if ( (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_READ)
1059	&& (fEvtMask & RTSERIALPORT_EVT_F_DATA_RX))
1060	aPollFds[0].events \|= POLLIN;
1061	if ( (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_WRITE)
1062	&& (fEvtMask & RTSERIALPORT_EVT_F_DATA_TX))
1063	aPollFds[0].events \|= POLLOUT;
1064
1065	aPollFds[1].fd = pThis->iFdPipeR;
1066	aPollFds[1].events = POLLIN \| POLLERR \| POLLHUP;
1067	aPollFds[1].revents = 0;
1068
1069	int rcPsx = 0;
1070	int msTimeoutLeft = msTimeout == RT_INDEFINITE_WAIT ? -1 : msTimeout;
1071	while (msTimeoutLeft != 0)
1072	{
1073	uint64_t tsPollStart = RTTimeMilliTS();
1074
1075	rcPsx = poll(&aPollFds[0], RT_ELEMENTS(aPollFds), msTimeoutLeft);
1076	if (rcPsx != -1 \|\| errno != EINTR)
1077	break;
1078	/* Restart when getting interrupted. */
1079	if (msTimeoutLeft > -1)
1080	{
1081	uint64_t tsPollEnd = RTTimeMilliTS();
1082	uint64_t tsPollSpan = tsPollEnd - tsPollStart;
1083	msTimeoutLeft -= RT_MIN(tsPollSpan, (uint32_t)msTimeoutLeft);
1084	}
1085	}
1086
1087	uint32_t fEvtsPending = 0;
1088	if (rcPsx < 0 && errno != EINTR)
1089	rc = RTErrConvertFromErrno(errno);
1090	else if (rcPsx > 0)
1091	{
1092	if (aPollFds[0].revents != 0)
1093	{
1094	fEvtsPending \|= (aPollFds[0].revents & POLLIN) ? RTSERIALPORT_EVT_F_DATA_RX : 0;
1095	fEvtsPending \|= (aPollFds[0].revents & POLLOUT) ? RTSERIALPORT_EVT_F_DATA_TX : 0;
1096	/** @todo BREAK condition detection. */
1097	}
1098
1099	if (aPollFds[1].revents != 0)
1100	{
1101	AssertReturn(!(aPollFds[1].revents & (POLLHUP \| POLLERR \| POLLNVAL)), VERR_INTERNAL_ERROR);
1102	Assert(aPollFds[1].revents & POLLIN);
1103
1104	uint8_t bWakeupReason = 0;
1105	ssize_t cbRead = read(pThis->iFdPipeR, &bWakeupReason, 1);
1106	if (cbRead == 1)
1107	{
1108	switch (bWakeupReason)
1109	{
1110	case RTSERIALPORT_WAKEUP_PIPE_REASON_INTERRUPT:
1111	rc = VERR_INTERRUPTED;
1112	break;
1113	case RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED:
1114	fEvtsPending \|= RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED;
1115	break;
1116	case RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_MONITOR_FAILED:
1117	fEvtsPending \|= RTSERIALPORT_EVT_F_STATUS_LINE_MONITOR_FAILED;
1118	break;
1119	default:
1120	AssertFailed();
1121	rc = VERR_INTERNAL_ERROR;
1122	}
1123	}
1124	else
1125	rc = VERR_INTERNAL_ERROR;
1126	}
1127	}
1128	else
1129	rc = VERR_TIMEOUT;
1130
1131	*pfEvtsRecv = fEvtsPending & fEvtMask;
1132	fEvtsPending &= ~fEvtMask;
1133	ASMAtomicOrU32(&pThis->fEvtsPending, fEvtsPending);
1134	}
1135
1136	return rc;
1137	}
1138
1139
1140	RTDECL(int) RTSerialPortEvtPollInterrupt(RTSERIALPORT hSerialPort)
1141	{
1142	PRTSERIALPORTINTERNAL pThis = hSerialPort;
1143	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
1144	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
1145
1146	return rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_INTERRUPT);
1147	}
1148
1149
1150	RTDECL(int) RTSerialPortChgBreakCondition(RTSERIALPORT hSerialPort, bool fSet)
1151	{
1152	PRTSERIALPORTINTERNAL pThis = hSerialPort;
1153	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
1154	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
1155
1156	int rc = VINF_SUCCESS;
1157	int rcPsx = ioctl(pThis->iFd, fSet ? TIOCSBRK : TIOCCBRK);
1158	if (rcPsx == -1)
1159	rc = RTErrConvertFromErrno(errno);
1160
1161	return rc;
1162	}
1163
1164
1165	RTDECL(int) RTSerialPortChgStatusLines(RTSERIALPORT hSerialPort, uint32_t fClear, uint32_t fSet)
1166	{
1167	PRTSERIALPORTINTERNAL pThis = hSerialPort;
1168	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
1169	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
1170
1171	int rc = VINF_SUCCESS;
1172	int fTiocmSet = 0;
1173	int fTiocmClear = 0;
1174
1175	if (fClear & RTSERIALPORT_CHG_STS_LINES_F_RTS)
1176	fTiocmClear \|= TIOCM_RTS;
1177	if (fClear & RTSERIALPORT_CHG_STS_LINES_F_DTR)
1178	fTiocmClear \|= TIOCM_DTR;
1179
1180	if (fSet & RTSERIALPORT_CHG_STS_LINES_F_RTS)
1181	fTiocmSet \|= TIOCM_RTS;
1182	if (fSet & RTSERIALPORT_CHG_STS_LINES_F_DTR)
1183	fTiocmSet \|= TIOCM_DTR;
1184
1185	int rcPsx = ioctl(pThis->iFd, TIOCMBIS, &fTiocmSet);
1186	if (!rcPsx)
1187	{
1188	rcPsx = ioctl(pThis->iFd, TIOCMBIC, &fTiocmClear);
1189	if (rcPsx == -1)
1190	rc = RTErrConvertFromErrno(errno);
1191	}
1192	return rc;
1193	}
1194
1195
1196	RTDECL(int) RTSerialPortQueryStatusLines(RTSERIALPORT hSerialPort, uint32_t *pfStsLines)
1197	{
1198	PRTSERIALPORTINTERNAL pThis = hSerialPort;
1199	AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
1200	AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
1201	AssertPtrReturn(pfStsLines, VERR_INVALID_POINTER);
1202
1203	*pfStsLines = 0;
1204
1205	int rc = VINF_SUCCESS;
1206	int fStsLines = 0;
1207	int rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLines);
1208	if (!rcPsx)
1209	{
1210	/* This resets the status line event pending flag. */
1211	for (;;)
1212	{
1213	uint32_t fEvtsPending = ASMAtomicReadU32(&pThis->fEvtsPending);
1214	if (ASMAtomicCmpXchgU32(&pThis->fEvtsPending, fEvtsPending & ~RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED, fEvtsPending))
1215	break;
1216	}
1217
1218	*pfStsLines \|= (fStsLines & TIOCM_CAR) ? RTSERIALPORT_STS_LINE_DCD : 0;
1219	*pfStsLines \|= (fStsLines & TIOCM_RNG) ? RTSERIALPORT_STS_LINE_RI : 0;
1220	*pfStsLines \|= (fStsLines & TIOCM_DSR) ? RTSERIALPORT_STS_LINE_DSR : 0;
1221	*pfStsLines \|= (fStsLines & TIOCM_CTS) ? RTSERIALPORT_STS_LINE_CTS : 0;
1222	}
1223	else
1224	rc = RTErrConvertFromErrno(errno);
1225
1226	return rc;
1227	}
1228

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source: vbox/trunk/src/VBox/Runtime/r3/posix/serialport-posix.cpp@ 71956

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