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Handle EINTR from tcdrain() in sp_drain().
[libserialport.git] / serialport.c
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1/*
2 * This file is part of the libserialport project.
3 *
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
6 * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
7 * Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation, either version 3 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23#include <string.h>
24#include <sys/types.h>
25#include <sys/stat.h>
26#include <fcntl.h>
27#include <unistd.h>
28#include <stdlib.h>
29#include <errno.h>
30#include <stdio.h>
31#include <stdarg.h>
32#ifdef _WIN32
33#include <windows.h>
34#include <tchar.h>
35#include <stdio.h>
36#else
37#include <limits.h>
38#include <termios.h>
39#include <sys/ioctl.h>
40#include <sys/time.h>
41#include <limits.h>
42#endif
43#ifdef __APPLE__
44#include <IOKit/IOKitLib.h>
45#include <IOKit/serial/IOSerialKeys.h>
46#include <IOKit/serial/ioss.h>
47#include <sys/syslimits.h>
48#endif
49#ifdef __linux__
50#include "libudev.h"
51#include "linux/serial.h"
52#include "linux_termios.h"
53#if defined(TCGETX) && defined(TCSETX) && defined(HAVE_TERMIOX)
54#define USE_TERMIOX
55#endif
56#endif
57
58#ifndef _WIN32
59#include "linux_termios.h"
60#endif
61
62#include "libserialport.h"
63
64struct sp_port {
65 char *name;
66#ifdef _WIN32
67 HANDLE hdl;
68 COMMTIMEOUTS timeouts;
69 OVERLAPPED write_ovl;
70 OVERLAPPED read_ovl;
71 BYTE pending_byte;
72 BOOL writing;
73#else
74 int fd;
75#endif
76};
77
78struct sp_port_config {
79 int baudrate;
80 int bits;
81 enum sp_parity parity;
82 int stopbits;
83 enum sp_rts rts;
84 enum sp_cts cts;
85 enum sp_dtr dtr;
86 enum sp_dsr dsr;
87 enum sp_xonxoff xon_xoff;
88};
89
90struct port_data {
91#ifdef _WIN32
92 DCB dcb;
93#else
94 struct termios term;
95 int controlbits;
96 int termiox_supported;
97 int flow;
98#endif
99};
100
101/* Standard baud rates. */
102#ifdef _WIN32
103#define BAUD_TYPE DWORD
104#define BAUD(n) {CBR_##n, n}
105#else
106#define BAUD_TYPE speed_t
107#define BAUD(n) {B##n, n}
108#endif
109
110struct std_baudrate {
111 BAUD_TYPE index;
112 int value;
113};
114
115const struct std_baudrate std_baudrates[] = {
116#ifdef _WIN32
117 /*
118 * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
119 * have documented CBR_* macros.
120 */
121 BAUD(110), BAUD(300), BAUD(600), BAUD(1200), BAUD(2400), BAUD(4800),
122 BAUD(9600), BAUD(14400), BAUD(19200), BAUD(38400), BAUD(57600),
123 BAUD(115200), BAUD(128000), BAUD(256000),
124#else
125 BAUD(50), BAUD(75), BAUD(110), BAUD(134), BAUD(150), BAUD(200),
126 BAUD(300), BAUD(600), BAUD(1200), BAUD(1800), BAUD(2400), BAUD(4800),
127 BAUD(9600), BAUD(19200), BAUD(38400), BAUD(57600), BAUD(115200),
128 BAUD(230400),
129#if !defined(__APPLE__) && !defined(__OpenBSD__)
130 BAUD(460800),
131#endif
132#endif
133};
134
135void (*sp_debug_handler)(const char *format, ...) = sp_default_debug_handler;
136
137#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
138#define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
139
140/* Debug output macros. */
141#define DEBUG(fmt, ...) do { if (sp_debug_handler) sp_debug_handler(fmt ".\n", ##__VA_ARGS__); } while (0)
142#define DEBUG_ERROR(err, msg) DEBUG("%s returning " #err ": " msg, __func__)
143#define DEBUG_FAIL(msg) do { \
144 char *errmsg = sp_last_error_message(); \
145 DEBUG("%s returning SP_ERR_FAIL: " msg ": %s", __func__, errmsg); \
146 sp_free_error_message(errmsg); \
147} while (0);
148#define RETURN() do { DEBUG("%s returning", __func__); return; } while(0)
149#define RETURN_CODE(x) do { DEBUG("%s returning " #x, __func__); return x; } while (0)
150#define RETURN_CODEVAL(x) do { \
151 switch (x) { \
152 case SP_OK: RETURN_CODE(SP_OK); \
153 case SP_ERR_ARG: RETURN_CODE(SP_ERR_ARG); \
154 case SP_ERR_FAIL: RETURN_CODE(SP_ERR_FAIL); \
155 case SP_ERR_MEM: RETURN_CODE(SP_ERR_MEM); \
156 case SP_ERR_SUPP: RETURN_CODE(SP_ERR_SUPP); \
157 } \
158} while (0)
159#define RETURN_OK() RETURN_CODE(SP_OK);
160#define RETURN_ERROR(err, msg) do { DEBUG_ERROR(err, msg); return err; } while (0)
161#define RETURN_FAIL(msg) do { DEBUG_FAIL(msg); return SP_ERR_FAIL; } while (0)
162#define RETURN_VALUE(fmt, x) do { DEBUG("%s returning " fmt, __func__, x); return x; } while (0)
163#define SET_ERROR(val, err, msg) do { DEBUG_ERROR(err, msg); val = err; } while (0)
164#define SET_FAIL(val, msg) do { DEBUG_FAIL(msg); val = SP_ERR_FAIL; } while (0)
165#define TRACE(fmt, ...) DEBUG("%s(" fmt ") called", __func__, ##__VA_ARGS__)
166
167#define TRY(x) do { int ret = x; if (ret != SP_OK) RETURN_CODEVAL(ret); } while (0)
168
169/* Helper functions. */
170static struct sp_port **list_append(struct sp_port **list, const char *portname);
171static enum sp_return get_config(struct sp_port *port, struct port_data *data,
172 struct sp_port_config *config);
173static enum sp_return set_config(struct sp_port *port, struct port_data *data,
174 const struct sp_port_config *config);
175
176enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
177{
178 struct sp_port *port;
179 int len;
180
181 TRACE("%s, %p", portname, port_ptr);
182
183 if (!port_ptr)
184 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
185
186 *port_ptr = NULL;
187
188 if (!portname)
189 RETURN_ERROR(SP_ERR_ARG, "Null port name");
190
191 DEBUG("Building structure for port %s", portname);
192
193 if (!(port = malloc(sizeof(struct sp_port))))
194 RETURN_ERROR(SP_ERR_MEM, "Port structure malloc failed");
195
196 len = strlen(portname) + 1;
197
198 if (!(port->name = malloc(len))) {
199 free(port);
200 RETURN_ERROR(SP_ERR_MEM, "Port name malloc failed");
201 }
202
203 memcpy(port->name, portname, len);
204
205#ifdef _WIN32
206 port->hdl = INVALID_HANDLE_VALUE;
207#else
208 port->fd = -1;
209#endif
210
211 *port_ptr = port;
212
213 RETURN_OK();
214}
215
216char *sp_get_port_name(const struct sp_port *port)
217{
218 TRACE("%p", port);
219
220 if (!port)
221 return NULL;
222
223 RETURN_VALUE("%s", port->name);
224}
225
226enum sp_return sp_get_port_handle(const struct sp_port *port, void *result_ptr)
227{
228 TRACE("%p, %p", port, result_ptr);
229
230 if (!port)
231 RETURN_ERROR(SP_ERR_ARG, "Null port");
232
233#ifdef _WIN32
234 HANDLE *handle_ptr = result_ptr;
235 *handle_ptr = port->hdl;
236#else
237 int *fd_ptr = result_ptr;
238 *fd_ptr = port->fd;
239#endif
240
241 RETURN_OK();
242}
243
244enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr)
245{
246 TRACE("%p, %p", port, copy_ptr);
247
248 if (!copy_ptr)
249 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
250
251 *copy_ptr = NULL;
252
253 if (!port)
254 RETURN_ERROR(SP_ERR_ARG, "Null port");
255
256 if (!port->name)
257 RETURN_ERROR(SP_ERR_ARG, "Null port name");
258
259 DEBUG("Copying port structure");
260
261 RETURN_VALUE("%p", sp_get_port_by_name(port->name, copy_ptr));
262}
263
264void sp_free_port(struct sp_port *port)
265{
266 TRACE("%p", port);
267
268 if (!port) {
269 DEBUG("Null port");
270 RETURN();
271 }
272
273 DEBUG("Freeing port structure");
274
275 if (port->name)
276 free(port->name);
277
278 free(port);
279
280 RETURN();
281}
282
283static struct sp_port **list_append(struct sp_port **list, const char *portname)
284{
285 void *tmp;
286 unsigned int count;
287
288 for (count = 0; list[count]; count++);
289 if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2))))
290 goto fail;
291 list = tmp;
292 if (sp_get_port_by_name(portname, &list[count]) != SP_OK)
293 goto fail;
294 list[count + 1] = NULL;
295 return list;
296
297fail:
298 sp_free_port_list(list);
299 return NULL;
300}
301
302enum sp_return sp_list_ports(struct sp_port ***list_ptr)
303{
304 struct sp_port **list;
305 int ret = SP_ERR_SUPP;
306
307 TRACE("%p", list_ptr);
308
309 if (!list_ptr)
310 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
311
312 DEBUG("Enumerating ports");
313
314 if (!(list = malloc(sizeof(struct sp_port **))))
315 RETURN_ERROR(SP_ERR_MEM, "Port list malloc failed");
316
317 list[0] = NULL;
318
319#ifdef _WIN32
320 HKEY key;
321 TCHAR *value, *data;
322 DWORD max_value_len, max_data_size, max_data_len;
323 DWORD value_len, data_size, data_len;
324 DWORD type, index = 0;
325 char *name;
326 int name_len;
327
328 ret = SP_OK;
329
330 DEBUG("Opening registry key");
331 if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
332 0, KEY_QUERY_VALUE, &key) != ERROR_SUCCESS) {
333 SET_FAIL(ret, "RegOpenKeyEx() failed");
334 goto out_done;
335 }
336 DEBUG("Querying registry key value and data sizes");
337 if (RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
338 &max_value_len, &max_data_size, NULL, NULL) != ERROR_SUCCESS) {
339 SET_FAIL(ret, "RegQueryInfoKey() failed");
340 goto out_close;
341 }
342 max_data_len = max_data_size / sizeof(TCHAR);
343 if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) {
344 SET_ERROR(ret, SP_ERR_MEM, "registry value malloc failed");
345 goto out_close;
346 }
347 if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) {
348 SET_ERROR(ret, SP_ERR_MEM, "registry data malloc failed");
349 goto out_free_value;
350 }
351 DEBUG("Iterating over values");
352 while (
353 value_len = max_value_len + 1,
354 data_size = max_data_size,
355 RegEnumValue(key, index, value, &value_len,
356 NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS)
357 {
358 data_len = data_size / sizeof(TCHAR);
359 data[data_len] = '\0';
360#ifdef UNICODE
361 name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL)
362#else
363 name_len = data_len + 1;
364#endif
365 if (!(name = malloc(name_len))) {
366 SET_ERROR(ret, SP_ERR_MEM, "registry port name malloc failed");
367 goto out;
368 }
369#ifdef UNICODE
370 WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL);
371#else
372 strcpy(name, data);
373#endif
374 if (type == REG_SZ) {
375 DEBUG("Found port %s", name);
376 if (!(list = list_append(list, name))) {
377 SET_ERROR(ret, SP_ERR_MEM, "list append failed");
378 goto out;
379 }
380 }
381 index++;
382 }
383out:
384 free(data);
385out_free_value:
386 free(value);
387out_close:
388 RegCloseKey(key);
389out_done:
390#endif
391#ifdef __APPLE__
392 mach_port_t master;
393 CFMutableDictionaryRef classes;
394 io_iterator_t iter;
395 char *path;
396 io_object_t port;
397 CFTypeRef cf_path;
398 Boolean result;
399
400 ret = SP_OK;
401
402 DEBUG("Getting IOKit master port");
403 if (IOMasterPort(MACH_PORT_NULL, &master) != KERN_SUCCESS) {
404 SET_FAIL(ret, "IOMasterPort() failed");
405 goto out_done;
406 }
407
408 DEBUG("Creating matching dictionary");
409 if (!(classes = IOServiceMatching(kIOSerialBSDServiceValue))) {
410 SET_FAIL(ret, "IOServiceMatching() failed");
411 goto out_done;
412 }
413
414 CFDictionarySetValue(classes,
415 CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDAllTypes));
416
417 DEBUG("Getting matching services");
418 if (IOServiceGetMatchingServices(master, classes, &iter) != KERN_SUCCESS) {
419 SET_FAIL(ret, "IOServiceGetMatchingServices() failed");
420 goto out_done;
421 }
422
423 if (!(path = malloc(PATH_MAX))) {
424 SET_ERROR(ret, SP_ERR_MEM, "device path malloc failed");
425 goto out_release;
426 }
427
428 DEBUG("Iterating over results");
429 while ((port = IOIteratorNext(iter))) {
430 cf_path = IORegistryEntryCreateCFProperty(port,
431 CFSTR(kIOCalloutDeviceKey), kCFAllocatorDefault, 0);
432 if (cf_path) {
433 result = CFStringGetCString(cf_path,
434 path, PATH_MAX, kCFStringEncodingASCII);
435 CFRelease(cf_path);
436 if (result) {
437 DEBUG("Found port %s", path);
438 if (!(list = list_append(list, path))) {
439 SET_ERROR(ret, SP_ERR_MEM, "list append failed");
440 IOObjectRelease(port);
441 goto out;
442 }
443 }
444 }
445 IOObjectRelease(port);
446 }
447out:
448 free(path);
449out_release:
450 IOObjectRelease(iter);
451out_done:
452#endif
453#ifdef __linux__
454 struct udev *ud;
455 struct udev_enumerate *ud_enumerate;
456 struct udev_list_entry *ud_list;
457 struct udev_list_entry *ud_entry;
458 const char *path;
459 struct udev_device *ud_dev, *ud_parent;
460 const char *name;
461 const char *driver;
462 int fd, ioctl_result;
463 struct serial_struct serial_info;
464
465 ret = SP_OK;
466
467 DEBUG("Enumerating tty devices");
468 ud = udev_new();
469 ud_enumerate = udev_enumerate_new(ud);
470 udev_enumerate_add_match_subsystem(ud_enumerate, "tty");
471 udev_enumerate_scan_devices(ud_enumerate);
472 ud_list = udev_enumerate_get_list_entry(ud_enumerate);
473 DEBUG("Iterating over results");
474 udev_list_entry_foreach(ud_entry, ud_list) {
475 path = udev_list_entry_get_name(ud_entry);
476 DEBUG("Found device %s", path);
477 ud_dev = udev_device_new_from_syspath(ud, path);
478 /* If there is no parent device, this is a virtual tty. */
479 ud_parent = udev_device_get_parent(ud_dev);
480 if (ud_parent == NULL) {
481 DEBUG("No parent device, assuming virtual tty");
482 udev_device_unref(ud_dev);
483 continue;
484 }
485 name = udev_device_get_devnode(ud_dev);
486 /* The serial8250 driver has a hardcoded number of ports.
487 * The only way to tell which actually exist on a given system
488 * is to try to open them and make an ioctl call. */
489 driver = udev_device_get_driver(ud_parent);
490 if (driver && !strcmp(driver, "serial8250")) {
491 DEBUG("serial8250 device, attempting to open");
492 if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
493 DEBUG("open failed, skipping");
494 goto skip;
495 }
496 ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
497 close(fd);
498 if (ioctl_result != 0) {
499 DEBUG("ioctl failed, skipping");
500 goto skip;
501 }
502 if (serial_info.type == PORT_UNKNOWN) {
503 DEBUG("port type is unknown, skipping");
504 goto skip;
505 }
506 }
507 DEBUG("Found port %s", name);
508 list = list_append(list, name);
509skip:
510 udev_device_unref(ud_dev);
511 if (!list) {
512 SET_ERROR(ret, SP_ERR_MEM, "list append failed");
513 goto out;
514 }
515 }
516out:
517 udev_enumerate_unref(ud_enumerate);
518 udev_unref(ud);
519#endif
520
521 switch (ret) {
522 case SP_OK:
523 *list_ptr = list;
524 RETURN_OK();
525 case SP_ERR_SUPP:
526 DEBUG_ERROR(SP_ERR_SUPP, "Enumeration not supported on this platform.");
527 default:
528 if (list)
529 sp_free_port_list(list);
530 *list_ptr = NULL;
531 return ret;
532 }
533}
534
535void sp_free_port_list(struct sp_port **list)
536{
537 unsigned int i;
538
539 TRACE("%p", list);
540
541 if (!list) {
542 DEBUG("Null list");
543 RETURN();
544 }
545
546 DEBUG("Freeing port list");
547
548 for (i = 0; list[i]; i++)
549 sp_free_port(list[i]);
550 free(list);
551
552 RETURN();
553}
554
555#define CHECK_PORT() do { \
556 if (port == NULL) \
557 RETURN_ERROR(SP_ERR_ARG, "Null port"); \
558 if (port->name == NULL) \
559 RETURN_ERROR(SP_ERR_ARG, "Null port name"); \
560} while (0)
561#ifdef _WIN32
562#define CHECK_PORT_HANDLE() do { \
563 if (port->hdl == INVALID_HANDLE_VALUE) \
564 RETURN_ERROR(SP_ERR_ARG, "Invalid port handle"); \
565} while (0)
566#else
567#define CHECK_PORT_HANDLE() do { \
568 if (port->fd < 0) \
569 RETURN_ERROR(SP_ERR_ARG, "Invalid port fd"); \
570} while (0)
571#endif
572#define CHECK_OPEN_PORT() do { \
573 CHECK_PORT(); \
574 CHECK_PORT_HANDLE(); \
575} while (0)
576
577enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
578{
579 struct port_data data;
580 struct sp_port_config config;
581 enum sp_return ret;
582
583 TRACE("%p, 0x%x", port, flags);
584
585 CHECK_PORT();
586
587 if (flags > (SP_MODE_READ | SP_MODE_WRITE))
588 RETURN_ERROR(SP_ERR_ARG, "Invalid flags");
589
590 DEBUG("Opening port %s", port->name);
591
592#ifdef _WIN32
593 DWORD desired_access = 0, flags_and_attributes = 0;
594 char *escaped_port_name;
595
596 /* Prefix port name with '\\.\' to work with ports above COM9. */
597 if (!(escaped_port_name = malloc(strlen(port->name + 5))))
598 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
599 sprintf(escaped_port_name, "\\\\.\\%s", port->name);
600
601 /* Map 'flags' to the OS-specific settings. */
602 flags_and_attributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED;
603 if (flags & SP_MODE_READ)
604 desired_access |= GENERIC_READ;
605 if (flags & SP_MODE_WRITE)
606 desired_access |= GENERIC_WRITE;
607
608 port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0,
609 OPEN_EXISTING, flags_and_attributes, 0);
610
611 free(escaped_port_name);
612
613 if (port->hdl == INVALID_HANDLE_VALUE)
614 RETURN_FAIL("port CreateFile() failed");
615
616 /* All timeouts initially disabled. */
617 port->timeouts.ReadIntervalTimeout = 0;
618 port->timeouts.ReadTotalTimeoutMultiplier = 0;
619 port->timeouts.ReadTotalTimeoutConstant = 0;
620 port->timeouts.WriteTotalTimeoutMultiplier = 0;
621 port->timeouts.WriteTotalTimeoutConstant = 0;
622
623 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0) {
624 sp_close(port);
625 RETURN_FAIL("SetCommTimeouts() failed");
626 }
627
628 /* Prepare OVERLAPPED structures. */
629 memset(&port->read_ovl, 0, sizeof(port->read_ovl));
630 memset(&port->write_ovl, 0, sizeof(port->write_ovl));
631 port->read_ovl.hEvent = INVALID_HANDLE_VALUE;
632 port->write_ovl.hEvent = INVALID_HANDLE_VALUE;
633 if ((port->read_ovl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL)) == INVALID_HANDLE_VALUE) {
634 sp_close(port);
635 RETURN_FAIL("read event CreateEvent() failed");
636 }
637 if ((port->write_ovl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL)) == INVALID_HANDLE_VALUE) {
638 sp_close(port);
639 RETURN_FAIL("write event CreateEvent() failed");
640 }
641
642 port->writing = FALSE;
643
644#else
645 int flags_local = O_NONBLOCK | O_NOCTTY;
646
647 /* Map 'flags' to the OS-specific settings. */
648 if (flags & (SP_MODE_READ | SP_MODE_WRITE))
649 flags_local |= O_RDWR;
650 else if (flags & SP_MODE_READ)
651 flags_local |= O_RDONLY;
652 else if (flags & SP_MODE_WRITE)
653 flags_local |= O_WRONLY;
654
655 if ((port->fd = open(port->name, flags_local)) < 0)
656 RETURN_FAIL("open() failed");
657#endif
658
659 ret = get_config(port, &data, &config);
660
661 if (ret < 0) {
662 sp_close(port);
663 RETURN_CODEVAL(ret);
664 }
665
666 /* Set sane port settings. */
667#ifdef _WIN32
668 data.dcb.fBinary = TRUE;
669 data.dcb.fDsrSensitivity = FALSE;
670 data.dcb.fErrorChar = FALSE;
671 data.dcb.fNull = FALSE;
672 data.dcb.fAbortOnError = TRUE;
673#else
674 /* Turn off all fancy termios tricks, give us a raw channel. */
675 data.term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IMAXBEL);
676#ifdef IUCLC
677 data.term.c_iflag &= ~IUCLC;
678#endif
679 data.term.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);
680#ifdef OLCUC
681 data.term.c_oflag &= ~OLCUC;
682#endif
683#ifdef NLDLY
684 data.term.c_oflag &= ~NLDLY;
685#endif
686#ifdef CRDLY
687 data.term.c_oflag &= ~CRDLY;
688#endif
689#ifdef TABDLY
690 data.term.c_oflag &= ~TABDLY;
691#endif
692#ifdef BSDLY
693 data.term.c_oflag &= ~BSDLY;
694#endif
695#ifdef VTDLY
696 data.term.c_oflag &= ~VTDLY;
697#endif
698#ifdef FFDLY
699 data.term.c_oflag &= ~FFDLY;
700#endif
701#ifdef OFILL
702 data.term.c_oflag &= ~OFILL;
703#endif
704 data.term.c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN);
705 data.term.c_cc[VMIN] = 0;
706 data.term.c_cc[VTIME] = 0;
707
708 /* Ignore modem status lines; enable receiver; leave control lines alone on close. */
709 data.term.c_cflag |= (CLOCAL | CREAD | HUPCL);
710#endif
711
712 ret = set_config(port, &data, &config);
713
714 if (ret < 0) {
715 sp_close(port);
716 RETURN_CODEVAL(ret);
717 }
718
719 RETURN_OK();
720}
721
722enum sp_return sp_close(struct sp_port *port)
723{
724 TRACE("%p", port);
725
726 CHECK_OPEN_PORT();
727
728 DEBUG("Closing port %s", port->name);
729
730#ifdef _WIN32
731 /* Returns non-zero upon success, 0 upon failure. */
732 if (CloseHandle(port->hdl) == 0)
733 RETURN_FAIL("port CloseHandle() failed");
734 port->hdl = INVALID_HANDLE_VALUE;
735 /* Close event handle created for overlapped reads. */
736 if (port->read_ovl.hEvent != INVALID_HANDLE_VALUE && CloseHandle(port->read_ovl.hEvent) == 0)
737 RETURN_FAIL("read event CloseHandle() failed");
738 /* Close event handle created for overlapped writes. */
739 if (port->write_ovl.hEvent != INVALID_HANDLE_VALUE && CloseHandle(port->write_ovl.hEvent) == 0)
740 RETURN_FAIL("write event CloseHandle() failed");
741#else
742 /* Returns 0 upon success, -1 upon failure. */
743 if (close(port->fd) == -1)
744 RETURN_FAIL("close() failed");
745 port->fd = -1;
746#endif
747
748 RETURN_OK();
749}
750
751enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers)
752{
753 TRACE("%p, 0x%x", port, buffers);
754
755 CHECK_OPEN_PORT();
756
757 if (buffers > SP_BUF_BOTH)
758 RETURN_ERROR(SP_ERR_ARG, "Invalid buffer selection");
759
760 const char *buffer_names[] = {"no", "input", "output", "both"};
761
762 DEBUG("Flushing %s buffers on port %s", buffer_names[buffers], port->name);
763
764#ifdef _WIN32
765 DWORD flags = 0;
766 if (buffers & SP_BUF_INPUT)
767 flags |= PURGE_RXCLEAR;
768 if (buffers & SP_BUF_OUTPUT)
769 flags |= PURGE_TXCLEAR;
770
771 /* Returns non-zero upon success, 0 upon failure. */
772 if (PurgeComm(port->hdl, flags) == 0)
773 RETURN_FAIL("PurgeComm() failed");
774#else
775 int flags = 0;
776 if (buffers & SP_BUF_BOTH)
777 flags = TCIOFLUSH;
778 else if (buffers & SP_BUF_INPUT)
779 flags = TCIFLUSH;
780 else if (buffers & SP_BUF_OUTPUT)
781 flags = TCOFLUSH;
782
783 /* Returns 0 upon success, -1 upon failure. */
784 if (tcflush(port->fd, flags) < 0)
785 RETURN_FAIL("tcflush() failed");
786#endif
787 RETURN_OK();
788}
789
790enum sp_return sp_drain(struct sp_port *port)
791{
792 TRACE("%p", port);
793
794 CHECK_OPEN_PORT();
795
796 DEBUG("Draining port %s", port->name);
797
798#ifdef _WIN32
799 /* Returns non-zero upon success, 0 upon failure. */
800 if (FlushFileBuffers(port->hdl) == 0)
801 RETURN_FAIL("FlushFileBuffers() failed");
802 RETURN_OK();
803#else
804 int result;
805 while (1) {
806 result = tcdrain(port->fd);
807 if (result < 0) {
808 if (errno == EINTR) {
809 DEBUG("tcdrain() was interrupted");
810 continue;
811 } else {
812 RETURN_FAIL("tcdrain() failed");
813 }
814 } else {
815 RETURN_OK();
816 }
817 }
818#endif
819}
820
821enum sp_return sp_blocking_write(struct sp_port *port, const void *buf, size_t count, unsigned int timeout)
822{
823 TRACE("%p, %p, %d, %d", port, buf, count, timeout);
824
825 CHECK_OPEN_PORT();
826
827 if (!buf)
828 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
829
830 if (timeout)
831 DEBUG("Writing %d bytes to port %s, timeout %d ms", count, port->name, timeout);
832 else
833 DEBUG("Writing %d bytes to port %s, no timeout", count, port->name);
834
835 if (count == 0)
836 RETURN_VALUE("0", 0);
837
838#ifdef _WIN32
839 DWORD bytes_written = 0;
840 BOOL result;
841
842 /* Wait for previous non-blocking write to complete, if any. */
843 if (port->writing) {
844 DEBUG("Waiting for previous write to complete");
845 result = GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
846 port->writing = 0;
847 if (!result)
848 RETURN_FAIL("Previous write failed to complete");
849 DEBUG("Previous write completed");
850 }
851
852 /* Set timeout. */
853 port->timeouts.WriteTotalTimeoutConstant = timeout;
854 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
855 RETURN_FAIL("SetCommTimeouts() failed");
856
857 /* Start write. */
858 if (WriteFile(port->hdl, buf, count, NULL, &port->write_ovl) == 0) {
859 if (GetLastError() == ERROR_IO_PENDING) {
860 DEBUG("Waiting for write to complete");
861 GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
862 DEBUG("Write completed, %d/%d bytes written", bytes_written, count);
863 RETURN_VALUE("%d", bytes_written);
864 } else {
865 RETURN_FAIL("WriteFile() failed");
866 }
867 } else {
868 DEBUG("Write completed immediately");
869 RETURN_VALUE("%d", count);
870 }
871#else
872 size_t bytes_written = 0;
873 unsigned char *ptr = (unsigned char *) buf;
874 struct timeval start, delta, now, end = {0, 0};
875 fd_set fds;
876 int result;
877
878 if (timeout) {
879 /* Get time at start of operation. */
880 gettimeofday(&start, NULL);
881 /* Define duration of timeout. */
882 delta.tv_sec = timeout / 1000;
883 delta.tv_usec = (timeout % 1000) * 1000;
884 /* Calculate time at which we should give up. */
885 timeradd(&start, &delta, &end);
886 }
887
888 /* Loop until we have written the requested number of bytes. */
889 while (bytes_written < count)
890 {
891 /* Wait until space is available. */
892 FD_ZERO(&fds);
893 FD_SET(port->fd, &fds);
894 if (timeout) {
895 gettimeofday(&now, NULL);
896 if (timercmp(&now, &end, >)) {
897 DEBUG("write timed out");
898 RETURN_VALUE("%d", bytes_written);
899 }
900 timersub(&end, &now, &delta);
901 }
902 result = select(port->fd + 1, NULL, &fds, NULL, timeout ? &delta : NULL);
903 if (result < 0) {
904 if (errno == EINTR) {
905 DEBUG("select() call was interrupted, repeating");
906 continue;
907 } else {
908 RETURN_FAIL("select() failed");
909 }
910 } else if (result == 0) {
911 DEBUG("write timed out");
912 RETURN_VALUE("%d", bytes_written);
913 }
914
915 /* Do write. */
916 result = write(port->fd, ptr, count - bytes_written);
917
918 if (result < 0) {
919 if (errno == EAGAIN)
920 /* This shouldn't happen because we did a select() first, but handle anyway. */
921 continue;
922 else
923 /* This is an actual failure. */
924 RETURN_FAIL("write() failed");
925 }
926
927 bytes_written += result;
928 ptr += result;
929 }
930
931 RETURN_VALUE("%d", bytes_written);
932#endif
933}
934
935enum sp_return sp_nonblocking_write(struct sp_port *port, const void *buf, size_t count)
936{
937 TRACE("%p, %p, %d", port, buf, count);
938
939 CHECK_OPEN_PORT();
940
941 if (!buf)
942 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
943
944 DEBUG("Writing up to %d bytes to port %s", count, port->name);
945
946 if (count == 0)
947 RETURN_VALUE("0", 0);
948
949#ifdef _WIN32
950 DWORD written = 0;
951 BYTE *ptr = (BYTE *) buf;
952
953 /* Check whether previous write is complete. */
954 if (port->writing) {
955 if (HasOverlappedIoCompleted(&port->write_ovl)) {
956 DEBUG("Previous write completed");
957 port->writing = 0;
958 } else {
959 DEBUG("Previous write not complete");
960 /* Can't take a new write until the previous one finishes. */
961 RETURN_VALUE("0", 0);
962 }
963 }
964
965 /* Set timeout. */
966 port->timeouts.WriteTotalTimeoutConstant = 0;
967 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
968 RETURN_FAIL("SetCommTimeouts() failed");
969
970 /* Keep writing data until the OS has to actually start an async IO for it.
971 * At that point we know the buffer is full. */
972 while (written < count)
973 {
974 /* Copy first byte of user buffer. */
975 port->pending_byte = *ptr++;
976
977 /* Start asynchronous write. */
978 if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
979 if (GetLastError() == ERROR_IO_PENDING) {
980 DEBUG("Asynchronous write started");
981 port->writing = 1;
982 RETURN_VALUE("%d", ++written);
983 } else {
984 /* Actual failure of some kind. */
985 RETURN_FAIL("WriteFile() failed");
986 }
987 } else {
988 DEBUG("Single byte written immediately.");
989 written++;
990 }
991 }
992
993 DEBUG("All bytes written immediately.");
994
995 RETURN_VALUE("%d", written);
996#else
997 /* Returns the number of bytes written, or -1 upon failure. */
998 ssize_t written = write(port->fd, buf, count);
999
1000 if (written < 0)
1001 RETURN_FAIL("write() failed");
1002 else
1003 RETURN_VALUE("%d", written);
1004#endif
1005}
1006
1007enum sp_return sp_blocking_read(struct sp_port *port, void *buf, size_t count, unsigned int timeout)
1008{
1009 TRACE("%p, %p, %d, %d", port, buf, count, timeout);
1010
1011 CHECK_OPEN_PORT();
1012
1013 if (!buf)
1014 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1015
1016 if (timeout)
1017 DEBUG("Reading %d bytes from port %s, timeout %d ms", count, port->name, timeout);
1018 else
1019 DEBUG("Reading %d bytes from port %s, no timeout", count, port->name);
1020
1021 if (count == 0)
1022 RETURN_VALUE("0", 0);
1023
1024#ifdef _WIN32
1025 DWORD bytes_read = 0;
1026
1027 /* Set timeout. */
1028 port->timeouts.ReadIntervalTimeout = 0;
1029 port->timeouts.ReadTotalTimeoutConstant = timeout;
1030 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1031 RETURN_FAIL("SetCommTimeouts() failed");
1032
1033 /* Start read. */
1034 if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0) {
1035 if (GetLastError() == ERROR_IO_PENDING) {
1036 DEBUG("Waiting for read to complete");
1037 GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE);
1038 DEBUG("Read completed, %d/%d bytes read", bytes_read, count);
1039 RETURN_VALUE("%d", bytes_read);
1040 } else {
1041 RETURN_FAIL("ReadFile() failed");
1042 }
1043 } else {
1044 DEBUG("Read completed immediately");
1045 RETURN_VALUE("%d", count);
1046 }
1047#else
1048 size_t bytes_read = 0;
1049 unsigned char *ptr = (unsigned char *) buf;
1050 struct timeval start, delta, now, end = {0, 0};
1051 fd_set fds;
1052 int result;
1053
1054 if (timeout) {
1055 /* Get time at start of operation. */
1056 gettimeofday(&start, NULL);
1057 /* Define duration of timeout. */
1058 delta.tv_sec = timeout / 1000;
1059 delta.tv_usec = (timeout % 1000) * 1000;
1060 /* Calculate time at which we should give up. */
1061 timeradd(&start, &delta, &end);
1062 }
1063
1064 /* Loop until we have the requested number of bytes. */
1065 while (bytes_read < count)
1066 {
1067 /* Wait until data is available. */
1068 FD_ZERO(&fds);
1069 FD_SET(port->fd, &fds);
1070 if (timeout) {
1071 gettimeofday(&now, NULL);
1072 if (timercmp(&now, &end, >))
1073 /* Timeout has expired. */
1074 RETURN_VALUE("%d", bytes_read);
1075 timersub(&end, &now, &delta);
1076 }
1077 result = select(port->fd + 1, &fds, NULL, NULL, timeout ? &delta : NULL);
1078 if (result < 0) {
1079 if (errno == EINTR) {
1080 DEBUG("select() call was interrupted, repeating");
1081 continue;
1082 } else {
1083 RETURN_FAIL("select() failed");
1084 }
1085 } else if (result == 0) {
1086 DEBUG("read timed out");
1087 RETURN_VALUE("%d", bytes_read);
1088 }
1089
1090 /* Do read. */
1091 result = read(port->fd, ptr, count - bytes_read);
1092
1093 if (result < 0) {
1094 if (errno == EAGAIN)
1095 /* This shouldn't happen because we did a select() first, but handle anyway. */
1096 continue;
1097 else
1098 /* This is an actual failure. */
1099 RETURN_FAIL("read() failed");
1100 }
1101
1102 bytes_read += result;
1103 ptr += result;
1104 }
1105
1106 RETURN_VALUE("%d", bytes_read);
1107#endif
1108}
1109
1110enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf, size_t count)
1111{
1112 TRACE("%p, %p, %d", port, buf, count);
1113
1114 CHECK_OPEN_PORT();
1115
1116 if (!buf)
1117 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1118
1119 DEBUG("Reading up to %d bytes from port %s", count, port->name);
1120
1121#ifdef _WIN32
1122 DWORD bytes_read;
1123
1124 /* Set timeout. */
1125 port->timeouts.ReadIntervalTimeout = MAXDWORD;
1126 port->timeouts.ReadTotalTimeoutConstant = 0;
1127 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1128 RETURN_FAIL("SetCommTimeouts() failed");
1129
1130 /* Do read. */
1131 if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0)
1132 RETURN_FAIL("ReadFile() failed");
1133
1134 /* Get number of bytes read. */
1135 GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE);
1136
1137 RETURN_VALUE("%d", bytes_read);
1138#else
1139 ssize_t bytes_read;
1140
1141 /* Returns the number of bytes read, or -1 upon failure. */
1142 if ((bytes_read = read(port->fd, buf, count)) < 0) {
1143 if (errno == EAGAIN)
1144 /* No bytes available. */
1145 bytes_read = 0;
1146 else
1147 /* This is an actual failure. */
1148 RETURN_FAIL("read() failed");
1149 }
1150 RETURN_VALUE("%d", bytes_read);
1151#endif
1152}
1153
1154enum sp_return sp_input_waiting(struct sp_port *port)
1155{
1156 TRACE("%p", port);
1157
1158 CHECK_OPEN_PORT();
1159
1160 DEBUG("Checking input bytes waiting on port %s", port->name);
1161
1162#ifdef _WIN32
1163 DWORD errors;
1164 COMSTAT comstat;
1165
1166 if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1167 RETURN_FAIL("ClearComError() failed");
1168 RETURN_VALUE("%d", comstat.cbInQue);
1169#else
1170 int bytes_waiting;
1171 if (ioctl(port->fd, TIOCINQ, &bytes_waiting) < 0)
1172 RETURN_FAIL("TIOCINQ ioctl failed");
1173 RETURN_VALUE("%d", bytes_waiting);
1174#endif
1175}
1176
1177enum sp_return sp_output_waiting(struct sp_port *port)
1178{
1179 TRACE("%p", port);
1180
1181 CHECK_OPEN_PORT();
1182
1183 DEBUG("Checking output bytes waiting on port %s", port->name);
1184
1185#ifdef _WIN32
1186 DWORD errors;
1187 COMSTAT comstat;
1188
1189 if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1190 RETURN_FAIL("ClearComError() failed");
1191 RETURN_VALUE("%d", comstat.cbOutQue);
1192#else
1193 int bytes_waiting;
1194 if (ioctl(port->fd, TIOCOUTQ, &bytes_waiting) < 0)
1195 RETURN_FAIL("TIOCOUTQ ioctl failed");
1196 RETURN_VALUE("%d", bytes_waiting);
1197#endif
1198}
1199
1200#ifdef __linux__
1201static enum sp_return get_baudrate(int fd, int *baudrate)
1202{
1203 void *data;
1204
1205 TRACE("%d, %p", fd, baudrate);
1206
1207 DEBUG("Getting baud rate");
1208
1209 if (!(data = malloc(get_termios_size())))
1210 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1211
1212 if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1213 free(data);
1214 RETURN_FAIL("getting termios failed");
1215 }
1216
1217 *baudrate = get_termios_speed(data);
1218
1219 free(data);
1220
1221 RETURN_OK();
1222}
1223
1224static enum sp_return set_baudrate(int fd, int baudrate)
1225{
1226 void *data;
1227
1228 TRACE("%d, %d", fd, baudrate);
1229
1230 DEBUG("Getting baud rate");
1231
1232 if (!(data = malloc(get_termios_size())))
1233 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1234
1235 if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1236 free(data);
1237 RETURN_FAIL("getting termios failed");
1238 }
1239
1240 DEBUG("Setting baud rate");
1241
1242 set_termios_speed(data, baudrate);
1243
1244 if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
1245 free(data);
1246 RETURN_FAIL("setting termios failed");
1247 }
1248
1249 free(data);
1250
1251 RETURN_OK();
1252}
1253
1254#ifdef USE_TERMIOX
1255static enum sp_return get_flow(int fd, int *flow)
1256{
1257 void *data;
1258
1259 TRACE("%d, %p", fd, flow);
1260
1261 DEBUG("Getting advanced flow control");
1262
1263 if (!(data = malloc(get_termiox_size())))
1264 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1265
1266 if (ioctl(fd, TCGETX, data) < 0) {
1267 free(data);
1268 RETURN_FAIL("getting termiox failed");
1269 }
1270
1271 *flow = get_termiox_flow(data);
1272
1273 free(data);
1274
1275 RETURN_OK();
1276}
1277
1278static enum sp_return set_flow(int fd, int flow)
1279{
1280 void *data;
1281
1282 TRACE("%d, %d", fd, flow);
1283
1284 DEBUG("Getting advanced flow control");
1285
1286 if (!(data = malloc(get_termiox_size())))
1287 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1288
1289 if (ioctl(fd, TCGETX, data) < 0) {
1290 free(data);
1291 RETURN_FAIL("getting termiox failed");
1292 }
1293
1294 DEBUG("Setting advanced flow control");
1295
1296 set_termiox_flow(data, flow);
1297
1298 if (ioctl(fd, TCSETX, data) < 0) {
1299 free(data);
1300 RETURN_FAIL("setting termiox failed");
1301 }
1302
1303 free(data);
1304
1305 RETURN_OK();
1306}
1307#endif /* USE_TERMIOX */
1308#endif /* __linux__ */
1309
1310static enum sp_return get_config(struct sp_port *port, struct port_data *data,
1311 struct sp_port_config *config)
1312{
1313 unsigned int i;
1314
1315 TRACE("%p, %p, %p", port, data, config);
1316
1317 DEBUG("Getting configuration for port %s", port->name);
1318
1319#ifdef _WIN32
1320 if (!GetCommState(port->hdl, &data->dcb))
1321 RETURN_FAIL("GetCommState() failed");
1322
1323 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1324 if (data->dcb.BaudRate == std_baudrates[i].index) {
1325 config->baudrate = std_baudrates[i].value;
1326 break;
1327 }
1328 }
1329
1330 if (i == NUM_STD_BAUDRATES)
1331 /* BaudRate field can be either an index or a custom baud rate. */
1332 config->baudrate = data->dcb.BaudRate;
1333
1334 config->bits = data->dcb.ByteSize;
1335
1336 if (data->dcb.fParity)
1337 switch (data->dcb.Parity) {
1338 case NOPARITY:
1339 config->parity = SP_PARITY_NONE;
1340 break;
1341 case ODDPARITY:
1342 config->parity = SP_PARITY_ODD;
1343 break;
1344 case EVENPARITY:
1345 config->parity = SP_PARITY_EVEN;
1346 break;
1347 case MARKPARITY:
1348 config->parity = SP_PARITY_MARK;
1349 break;
1350 case SPACEPARITY:
1351 config->parity = SP_PARITY_SPACE;
1352 break;
1353 default:
1354 config->parity = -1;
1355 }
1356 else
1357 config->parity = SP_PARITY_NONE;
1358
1359 switch (data->dcb.StopBits) {
1360 case ONESTOPBIT:
1361 config->stopbits = 1;
1362 break;
1363 case TWOSTOPBITS:
1364 config->stopbits = 2;
1365 break;
1366 default:
1367 config->stopbits = -1;
1368 }
1369
1370 switch (data->dcb.fRtsControl) {
1371 case RTS_CONTROL_DISABLE:
1372 config->rts = SP_RTS_OFF;
1373 break;
1374 case RTS_CONTROL_ENABLE:
1375 config->rts = SP_RTS_ON;
1376 break;
1377 case RTS_CONTROL_HANDSHAKE:
1378 config->rts = SP_RTS_FLOW_CONTROL;
1379 break;
1380 default:
1381 config->rts = -1;
1382 }
1383
1384 config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1385
1386 switch (data->dcb.fDtrControl) {
1387 case DTR_CONTROL_DISABLE:
1388 config->dtr = SP_DTR_OFF;
1389 break;
1390 case DTR_CONTROL_ENABLE:
1391 config->dtr = SP_DTR_ON;
1392 break;
1393 case DTR_CONTROL_HANDSHAKE:
1394 config->dtr = SP_DTR_FLOW_CONTROL;
1395 break;
1396 default:
1397 config->dtr = -1;
1398 }
1399
1400 config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1401
1402 if (data->dcb.fInX) {
1403 if (data->dcb.fOutX)
1404 config->xon_xoff = SP_XONXOFF_INOUT;
1405 else
1406 config->xon_xoff = SP_XONXOFF_IN;
1407 } else {
1408 if (data->dcb.fOutX)
1409 config->xon_xoff = SP_XONXOFF_OUT;
1410 else
1411 config->xon_xoff = SP_XONXOFF_DISABLED;
1412 }
1413
1414#else // !_WIN32
1415
1416 if (tcgetattr(port->fd, &data->term) < 0)
1417 RETURN_FAIL("tcgetattr() failed");
1418
1419 if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
1420 RETURN_FAIL("TIOCMGET ioctl failed");
1421
1422#ifdef USE_TERMIOX
1423 int ret = get_flow(port->fd, &data->flow);
1424
1425 if (ret == SP_ERR_FAIL && errno == EINVAL)
1426 data->termiox_supported = 0;
1427 else if (ret < 0)
1428 RETURN_CODEVAL(ret);
1429 else
1430 data->termiox_supported = 1;
1431#else
1432 data->termiox_supported = 0;
1433#endif
1434
1435 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1436 if (cfgetispeed(&data->term) == std_baudrates[i].index) {
1437 config->baudrate = std_baudrates[i].value;
1438 break;
1439 }
1440 }
1441
1442 if (i == NUM_STD_BAUDRATES) {
1443#ifdef __APPLE__
1444 config->baudrate = (int)data->term.c_ispeed;
1445#elif defined(__linux__)
1446 TRY(get_baudrate(port->fd, &config->baudrate));
1447#else
1448 config->baudrate = -1;
1449#endif
1450 }
1451
1452 switch (data->term.c_cflag & CSIZE) {
1453 case CS8:
1454 config->bits = 8;
1455 break;
1456 case CS7:
1457 config->bits = 7;
1458 break;
1459 case CS6:
1460 config->bits = 6;
1461 break;
1462 case CS5:
1463 config->bits = 5;
1464 break;
1465 default:
1466 config->bits = -1;
1467 }
1468
1469 if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
1470 config->parity = SP_PARITY_NONE;
1471 else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
1472 config->parity = -1;
1473#ifdef CMSPAR
1474 else if (data->term.c_cflag & CMSPAR)
1475 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_MARK : SP_PARITY_SPACE;
1476#endif
1477 else
1478 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
1479
1480 config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
1481
1482 if (data->term.c_cflag & CRTSCTS) {
1483 config->rts = SP_RTS_FLOW_CONTROL;
1484 config->cts = SP_CTS_FLOW_CONTROL;
1485 } else {
1486 if (data->termiox_supported && data->flow & RTS_FLOW)
1487 config->rts = SP_RTS_FLOW_CONTROL;
1488 else
1489 config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
1490
1491 config->cts = (data->termiox_supported && data->flow & CTS_FLOW) ?
1492 SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1493 }
1494
1495 if (data->termiox_supported && data->flow & DTR_FLOW)
1496 config->dtr = SP_DTR_FLOW_CONTROL;
1497 else
1498 config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
1499
1500 config->dsr = (data->termiox_supported && data->flow & DSR_FLOW) ?
1501 SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1502
1503 if (data->term.c_iflag & IXOFF) {
1504 if (data->term.c_iflag & IXON)
1505 config->xon_xoff = SP_XONXOFF_INOUT;
1506 else
1507 config->xon_xoff = SP_XONXOFF_IN;
1508 } else {
1509 if (data->term.c_iflag & IXON)
1510 config->xon_xoff = SP_XONXOFF_OUT;
1511 else
1512 config->xon_xoff = SP_XONXOFF_DISABLED;
1513 }
1514#endif
1515
1516 RETURN_OK();
1517}
1518
1519static enum sp_return set_config(struct sp_port *port, struct port_data *data,
1520 const struct sp_port_config *config)
1521{
1522 unsigned int i;
1523#ifdef __APPLE__
1524 BAUD_TYPE baud_nonstd;
1525
1526 baud_nonstd = B0;
1527#endif
1528#ifdef __linux__
1529 int baud_nonstd = 0;
1530#endif
1531
1532 TRACE("%p, %p, %p", port, data, config);
1533
1534 DEBUG("Setting configuration for port %s", port->name);
1535
1536#ifdef _WIN32
1537 if (config->baudrate >= 0) {
1538 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1539 if (config->baudrate == std_baudrates[i].value) {
1540 data->dcb.BaudRate = std_baudrates[i].index;
1541 break;
1542 }
1543 }
1544
1545 if (i == NUM_STD_BAUDRATES)
1546 data->dcb.BaudRate = config->baudrate;
1547 }
1548
1549 if (config->bits >= 0)
1550 data->dcb.ByteSize = config->bits;
1551
1552 if (config->parity >= 0) {
1553 switch (config->parity) {
1554 /* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */
1555 case SP_PARITY_NONE:
1556 data->dcb.Parity = NOPARITY;
1557 break;
1558 case SP_PARITY_ODD:
1559 data->dcb.Parity = ODDPARITY;
1560 break;
1561 case SP_PARITY_EVEN:
1562 data->dcb.Parity = EVENPARITY;
1563 break;
1564 case SP_PARITY_MARK:
1565 data->dcb.Parity = MARKPARITY;
1566 break;
1567 case SP_PARITY_SPACE:
1568 data->dcb.Parity = SPACEPARITY;
1569 break;
1570 default:
1571 RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1572 }
1573 }
1574
1575 if (config->stopbits >= 0) {
1576 switch (config->stopbits) {
1577 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
1578 case 1:
1579 data->dcb.StopBits = ONESTOPBIT;
1580 break;
1581 case 2:
1582 data->dcb.StopBits = TWOSTOPBITS;
1583 break;
1584 default:
1585 RETURN_ERROR(SP_ERR_ARG, "Invalid stop bit setting");
1586 }
1587 }
1588
1589 if (config->rts >= 0) {
1590 switch (config->rts) {
1591 case SP_RTS_OFF:
1592 data->dcb.fRtsControl = RTS_CONTROL_DISABLE;
1593 break;
1594 case SP_RTS_ON:
1595 data->dcb.fRtsControl = RTS_CONTROL_ENABLE;
1596 break;
1597 case SP_RTS_FLOW_CONTROL:
1598 data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
1599 break;
1600 default:
1601 RETURN_ERROR(SP_ERR_ARG, "Invalid RTS setting");
1602 }
1603 }
1604
1605 if (config->cts >= 0) {
1606 switch (config->cts) {
1607 case SP_CTS_IGNORE:
1608 data->dcb.fOutxCtsFlow = FALSE;
1609 break;
1610 case SP_CTS_FLOW_CONTROL:
1611 data->dcb.fOutxCtsFlow = TRUE;
1612 break;
1613 default:
1614 RETURN_ERROR(SP_ERR_ARG, "Invalid CTS setting");
1615 }
1616 }
1617
1618 if (config->dtr >= 0) {
1619 switch (config->dtr) {
1620 case SP_DTR_OFF:
1621 data->dcb.fDtrControl = DTR_CONTROL_DISABLE;
1622 break;
1623 case SP_DTR_ON:
1624 data->dcb.fDtrControl = DTR_CONTROL_ENABLE;
1625 break;
1626 case SP_DTR_FLOW_CONTROL:
1627 data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
1628 break;
1629 default:
1630 RETURN_ERROR(SP_ERR_ARG, "Invalid DTR setting");
1631 }
1632 }
1633
1634 if (config->dsr >= 0) {
1635 switch (config->dsr) {
1636 case SP_DSR_IGNORE:
1637 data->dcb.fOutxDsrFlow = FALSE;
1638 break;
1639 case SP_DSR_FLOW_CONTROL:
1640 data->dcb.fOutxDsrFlow = TRUE;
1641 break;
1642 default:
1643 RETURN_ERROR(SP_ERR_ARG, "Invalid DSR setting");
1644 }
1645 }
1646
1647 if (config->xon_xoff >= 0) {
1648 switch (config->xon_xoff) {
1649 case SP_XONXOFF_DISABLED:
1650 data->dcb.fInX = FALSE;
1651 data->dcb.fOutX = FALSE;
1652 break;
1653 case SP_XONXOFF_IN:
1654 data->dcb.fInX = TRUE;
1655 data->dcb.fOutX = FALSE;
1656 break;
1657 case SP_XONXOFF_OUT:
1658 data->dcb.fInX = FALSE;
1659 data->dcb.fOutX = TRUE;
1660 break;
1661 case SP_XONXOFF_INOUT:
1662 data->dcb.fInX = TRUE;
1663 data->dcb.fOutX = TRUE;
1664 break;
1665 default:
1666 RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1667 }
1668 }
1669
1670 if (!SetCommState(port->hdl, &data->dcb))
1671 RETURN_FAIL("SetCommState() failed");
1672
1673#else /* !_WIN32 */
1674
1675 int controlbits;
1676
1677 if (config->baudrate >= 0) {
1678 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1679 if (config->baudrate == std_baudrates[i].value) {
1680 if (cfsetospeed(&data->term, std_baudrates[i].index) < 0)
1681 RETURN_FAIL("cfsetospeed() failed");
1682
1683 if (cfsetispeed(&data->term, std_baudrates[i].index) < 0)
1684 RETURN_FAIL("cfsetispeed() failed");
1685 break;
1686 }
1687 }
1688
1689 /* Non-standard baud rate */
1690 if (i == NUM_STD_BAUDRATES) {
1691#ifdef __APPLE__
1692 /* Set "dummy" baud rate. */
1693 if (cfsetspeed(&data->term, B9600) < 0)
1694 RETURN_FAIL("cfsetspeed() failed");
1695 baud_nonstd = config->baudrate;
1696#elif defined(__linux__)
1697 baud_nonstd = 1;
1698#else
1699 RETURN_ERROR(SP_ERR_SUPP, "Non-standard baudrate not supported");
1700#endif
1701 }
1702 }
1703
1704 if (config->bits >= 0) {
1705 data->term.c_cflag &= ~CSIZE;
1706 switch (config->bits) {
1707 case 8:
1708 data->term.c_cflag |= CS8;
1709 break;
1710 case 7:
1711 data->term.c_cflag |= CS7;
1712 break;
1713 case 6:
1714 data->term.c_cflag |= CS6;
1715 break;
1716 case 5:
1717 data->term.c_cflag |= CS5;
1718 break;
1719 default:
1720 RETURN_ERROR(SP_ERR_ARG, "Invalid data bits setting");
1721 }
1722 }
1723
1724 if (config->parity >= 0) {
1725 data->term.c_iflag &= ~IGNPAR;
1726 data->term.c_cflag &= ~(PARENB | PARODD);
1727#ifdef CMSPAR
1728 data->term.c_cflag &= ~CMSPAR;
1729#endif
1730 switch (config->parity) {
1731 case SP_PARITY_NONE:
1732 data->term.c_iflag |= IGNPAR;
1733 break;
1734 case SP_PARITY_EVEN:
1735 data->term.c_cflag |= PARENB;
1736 break;
1737 case SP_PARITY_ODD:
1738 data->term.c_cflag |= PARENB | PARODD;
1739 break;
1740#ifdef CMSPAR
1741 case SP_PARITY_MARK:
1742 data->term.c_cflag |= PARENB | PARODD;
1743 data->term.c_cflag |= CMSPAR;
1744 break;
1745 case SP_PARITY_SPACE:
1746 data->term.c_cflag |= PARENB;
1747 data->term.c_cflag |= CMSPAR;
1748 break;
1749#else
1750 case SP_PARITY_MARK:
1751 case SP_PARITY_SPACE:
1752 RETURN_ERROR(SP_ERR_SUPP, "Mark/space parity not supported");
1753#endif
1754 default:
1755 RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1756 }
1757 }
1758
1759 if (config->stopbits >= 0) {
1760 data->term.c_cflag &= ~CSTOPB;
1761 switch (config->stopbits) {
1762 case 1:
1763 data->term.c_cflag &= ~CSTOPB;
1764 break;
1765 case 2:
1766 data->term.c_cflag |= CSTOPB;
1767 break;
1768 default:
1769 RETURN_ERROR(SP_ERR_ARG, "Invalid stop bits setting");
1770 }
1771 }
1772
1773 if (config->rts >= 0 || config->cts >= 0) {
1774 if (data->termiox_supported) {
1775 data->flow &= ~(RTS_FLOW | CTS_FLOW);
1776 switch (config->rts) {
1777 case SP_RTS_OFF:
1778 case SP_RTS_ON:
1779 controlbits = TIOCM_RTS;
1780 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
1781 RETURN_FAIL("Setting RTS signal level failed");
1782 break;
1783 case SP_RTS_FLOW_CONTROL:
1784 data->flow |= RTS_FLOW;
1785 break;
1786 default:
1787 break;
1788 }
1789 if (config->cts == SP_CTS_FLOW_CONTROL)
1790 data->flow |= CTS_FLOW;
1791
1792 if (data->flow & (RTS_FLOW | CTS_FLOW))
1793 data->term.c_iflag |= CRTSCTS;
1794 else
1795 data->term.c_iflag &= ~CRTSCTS;
1796 } else {
1797 /* Asymmetric use of RTS/CTS not supported. */
1798 if (data->term.c_iflag & CRTSCTS) {
1799 /* Flow control can only be disabled for both RTS & CTS together. */
1800 if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
1801 if (config->cts != SP_CTS_IGNORE)
1802 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
1803 }
1804 if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
1805 if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
1806 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
1807 }
1808 } else {
1809 /* Flow control can only be enabled for both RTS & CTS together. */
1810 if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
1811 ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
1812 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be enabled together");
1813 }
1814
1815 if (config->rts >= 0) {
1816 if (config->rts == SP_RTS_FLOW_CONTROL) {
1817 data->term.c_iflag |= CRTSCTS;
1818 } else {
1819 controlbits = TIOCM_RTS;
1820 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
1821 &controlbits) < 0)
1822 RETURN_FAIL("Setting RTS signal level failed");
1823 }
1824 }
1825 }
1826 }
1827
1828 if (config->dtr >= 0 || config->dsr >= 0) {
1829 if (data->termiox_supported) {
1830 data->flow &= ~(DTR_FLOW | DSR_FLOW);
1831 switch (config->dtr) {
1832 case SP_DTR_OFF:
1833 case SP_DTR_ON:
1834 controlbits = TIOCM_DTR;
1835 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
1836 RETURN_FAIL("Setting DTR signal level failed");
1837 break;
1838 case SP_DTR_FLOW_CONTROL:
1839 data->flow |= DTR_FLOW;
1840 break;
1841 default:
1842 break;
1843 }
1844 if (config->dsr == SP_DSR_FLOW_CONTROL)
1845 data->flow |= DSR_FLOW;
1846 } else {
1847 /* DTR/DSR flow control not supported. */
1848 if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
1849 RETURN_ERROR(SP_ERR_SUPP, "DTR/DSR flow control not supported");
1850
1851 if (config->dtr >= 0) {
1852 controlbits = TIOCM_DTR;
1853 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
1854 &controlbits) < 0)
1855 RETURN_FAIL("Setting DTR signal level failed");
1856 }
1857 }
1858 }
1859
1860 if (config->xon_xoff >= 0) {
1861 data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
1862 switch (config->xon_xoff) {
1863 case SP_XONXOFF_DISABLED:
1864 break;
1865 case SP_XONXOFF_IN:
1866 data->term.c_iflag |= IXOFF;
1867 break;
1868 case SP_XONXOFF_OUT:
1869 data->term.c_iflag |= IXON | IXANY;
1870 break;
1871 case SP_XONXOFF_INOUT:
1872 data->term.c_iflag |= IXON | IXOFF | IXANY;
1873 break;
1874 default:
1875 RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1876 }
1877 }
1878
1879 if (tcsetattr(port->fd, TCSANOW, &data->term) < 0)
1880 RETURN_FAIL("tcsetattr() failed");
1881
1882#ifdef __APPLE__
1883 if (baud_nonstd != B0) {
1884 if (ioctl(port->fd, IOSSIOSPEED, &baud_nonstd) == -1)
1885 RETURN_FAIL("IOSSIOSPEED ioctl failed");
1886 /* Set baud rates in data->term to correct, but incompatible
1887 * with tcsetattr() value, same as delivered by tcgetattr(). */
1888 if (cfsetspeed(&data->term, baud_nonstd) < 0)
1889 RETURN_FAIL("cfsetspeed() failed");
1890 }
1891#elif defined(__linux__)
1892 if (baud_nonstd)
1893 TRY(set_baudrate(port->fd, config->baudrate));
1894#ifdef USE_TERMIOX
1895 if (data->termiox_supported)
1896 TRY(set_flow(port->fd, data->flow));
1897#endif
1898#endif
1899
1900#endif /* !_WIN32 */
1901
1902 RETURN_OK();
1903}
1904
1905enum sp_return sp_new_config(struct sp_port_config **config_ptr)
1906{
1907 struct sp_port_config *config;
1908
1909 TRACE("%p", config_ptr);
1910
1911 if (!config_ptr)
1912 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
1913
1914 *config_ptr = NULL;
1915
1916 if (!(config = malloc(sizeof(struct sp_port_config))))
1917 RETURN_ERROR(SP_ERR_MEM, "config malloc failed");
1918
1919 config->baudrate = -1;
1920 config->bits = -1;
1921 config->parity = -1;
1922 config->stopbits = -1;
1923 config->rts = -1;
1924 config->cts = -1;
1925 config->dtr = -1;
1926 config->dsr = -1;
1927
1928 *config_ptr = config;
1929
1930 RETURN_OK();
1931}
1932
1933void sp_free_config(struct sp_port_config *config)
1934{
1935 TRACE("%p", config);
1936
1937 if (!config)
1938 DEBUG("Null config");
1939 else
1940 free(config);
1941
1942 RETURN();
1943}
1944
1945enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config)
1946{
1947 struct port_data data;
1948
1949 TRACE("%p, %p", port, config);
1950
1951 CHECK_OPEN_PORT();
1952
1953 if (!config)
1954 RETURN_ERROR(SP_ERR_ARG, "Null config");
1955
1956 TRY(get_config(port, &data, config));
1957
1958 RETURN_OK();
1959}
1960
1961enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config)
1962{
1963 struct port_data data;
1964 struct sp_port_config prev_config;
1965
1966 TRACE("%p, %p", port, config);
1967
1968 CHECK_OPEN_PORT();
1969
1970 if (!config)
1971 RETURN_ERROR(SP_ERR_ARG, "Null config");
1972
1973 TRY(get_config(port, &data, &prev_config));
1974 TRY(set_config(port, &data, config));
1975
1976 RETURN_OK();
1977}
1978
1979#define CREATE_ACCESSORS(x, type) \
1980enum sp_return sp_set_##x(struct sp_port *port, type x) { \
1981 struct port_data data; \
1982 struct sp_port_config config; \
1983 TRACE("%p, %d", port, x); \
1984 CHECK_OPEN_PORT(); \
1985 TRY(get_config(port, &data, &config)); \
1986 config.x = x; \
1987 TRY(set_config(port, &data, &config)); \
1988 RETURN_OK(); \
1989} \
1990enum sp_return sp_get_config_##x(const struct sp_port_config *config, type *x) { \
1991 TRACE("%p, %p", config, x); \
1992 if (!config) \
1993 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
1994 *x = config->x; \
1995 RETURN_OK(); \
1996} \
1997enum sp_return sp_set_config_##x(struct sp_port_config *config, type x) { \
1998 TRACE("%p, %d", config, x); \
1999 if (!config) \
2000 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2001 config->x = x; \
2002 RETURN_OK(); \
2003}
2004
2005CREATE_ACCESSORS(baudrate, int)
2006CREATE_ACCESSORS(bits, int)
2007CREATE_ACCESSORS(parity, enum sp_parity)
2008CREATE_ACCESSORS(stopbits, int)
2009CREATE_ACCESSORS(rts, enum sp_rts)
2010CREATE_ACCESSORS(cts, enum sp_cts)
2011CREATE_ACCESSORS(dtr, enum sp_dtr)
2012CREATE_ACCESSORS(dsr, enum sp_dsr)
2013CREATE_ACCESSORS(xon_xoff, enum sp_xonxoff)
2014
2015enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config, enum sp_flowcontrol flowcontrol)
2016{
2017 if (!config)
2018 RETURN_ERROR(SP_ERR_ARG, "Null configuration");
2019
2020 if (flowcontrol > SP_FLOWCONTROL_DTRDSR)
2021 RETURN_ERROR(SP_ERR_ARG, "Invalid flow control setting");
2022
2023 if (flowcontrol == SP_FLOWCONTROL_XONXOFF)
2024 config->xon_xoff = SP_XONXOFF_INOUT;
2025 else
2026 config->xon_xoff = SP_XONXOFF_DISABLED;
2027
2028 if (flowcontrol == SP_FLOWCONTROL_RTSCTS) {
2029 config->rts = SP_RTS_FLOW_CONTROL;
2030 config->cts = SP_CTS_FLOW_CONTROL;
2031 } else {
2032 if (config->rts == SP_RTS_FLOW_CONTROL)
2033 config->rts = SP_RTS_ON;
2034 config->cts = SP_CTS_IGNORE;
2035 }
2036
2037 if (flowcontrol == SP_FLOWCONTROL_DTRDSR) {
2038 config->dtr = SP_DTR_FLOW_CONTROL;
2039 config->dsr = SP_DSR_FLOW_CONTROL;
2040 } else {
2041 if (config->dtr == SP_DTR_FLOW_CONTROL)
2042 config->dtr = SP_DTR_ON;
2043 config->dsr = SP_DSR_IGNORE;
2044 }
2045
2046 RETURN_OK();
2047}
2048
2049enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol)
2050{
2051 struct port_data data;
2052 struct sp_port_config config;
2053
2054 TRACE("%p, %d", port, flowcontrol);
2055
2056 CHECK_OPEN_PORT();
2057
2058 TRY(get_config(port, &data, &config));
2059
2060 TRY(sp_set_config_flowcontrol(&config, flowcontrol));
2061
2062 TRY(set_config(port, &data, &config));
2063
2064 RETURN_OK();
2065}
2066
2067enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signals)
2068{
2069 TRACE("%p, %p", port, signals);
2070
2071 CHECK_OPEN_PORT();
2072
2073 if (!signals)
2074 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2075
2076 DEBUG("Getting control signals for port %s", port->name);
2077
2078 *signals = 0;
2079#ifdef _WIN32
2080 DWORD bits;
2081 if (GetCommModemStatus(port->hdl, &bits) == 0)
2082 RETURN_FAIL("GetCommModemStatus() failed");
2083 if (bits & MS_CTS_ON)
2084 *signals |= SP_SIG_CTS;
2085 if (bits & MS_DSR_ON)
2086 *signals |= SP_SIG_DSR;
2087 if (bits & MS_RLSD_ON)
2088 *signals |= SP_SIG_DCD;
2089 if (bits & MS_RING_ON)
2090 *signals |= SP_SIG_RI;
2091#else
2092 int bits;
2093 if (ioctl(port->fd, TIOCMGET, &bits) < 0)
2094 RETURN_FAIL("TIOCMGET ioctl failed");
2095 if (bits & TIOCM_CTS)
2096 *signals |= SP_SIG_CTS;
2097 if (bits & TIOCM_DSR)
2098 *signals |= SP_SIG_DSR;
2099 if (bits & TIOCM_CAR)
2100 *signals |= SP_SIG_DCD;
2101 if (bits & TIOCM_RNG)
2102 *signals |= SP_SIG_RI;
2103#endif
2104 RETURN_OK();
2105}
2106
2107enum sp_return sp_start_break(struct sp_port *port)
2108{
2109 TRACE("%p", port);
2110
2111 CHECK_OPEN_PORT();
2112#ifdef _WIN32
2113 if (SetCommBreak(port->hdl) == 0)
2114 RETURN_FAIL("SetCommBreak() failed");
2115#else
2116 if (ioctl(port->fd, TIOCSBRK, 1) < 0)
2117 RETURN_FAIL("TIOCSBRK ioctl failed");
2118#endif
2119
2120 RETURN_OK();
2121}
2122
2123enum sp_return sp_end_break(struct sp_port *port)
2124{
2125 TRACE("%p", port);
2126
2127 CHECK_OPEN_PORT();
2128#ifdef _WIN32
2129 if (ClearCommBreak(port->hdl) == 0)
2130 RETURN_FAIL("ClearCommBreak() failed");
2131#else
2132 if (ioctl(port->fd, TIOCCBRK, 1) < 0)
2133 RETURN_FAIL("TIOCCBRK ioctl failed");
2134#endif
2135
2136 RETURN_OK();
2137}
2138
2139int sp_last_error_code(void)
2140{
2141 TRACE("");
2142#ifdef _WIN32
2143 RETURN_VALUE("%d", GetLastError());
2144#else
2145 RETURN_VALUE("%d", errno);
2146#endif
2147}
2148
2149char *sp_last_error_message(void)
2150{
2151 TRACE("");
2152
2153#ifdef _WIN32
2154 LPVOID message;
2155 DWORD error = GetLastError();
2156
2157 FormatMessage(
2158 FORMAT_MESSAGE_ALLOCATE_BUFFER |
2159 FORMAT_MESSAGE_FROM_SYSTEM |
2160 FORMAT_MESSAGE_IGNORE_INSERTS,
2161 NULL,
2162 error,
2163 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
2164 (LPTSTR) &message,
2165 0, NULL );
2166
2167 RETURN_VALUE("%s", message);
2168#else
2169 RETURN_VALUE("%s", strerror(errno));
2170#endif
2171}
2172
2173void sp_free_error_message(char *message)
2174{
2175 TRACE("%s", message);
2176
2177#ifdef _WIN32
2178 LocalFree(message);
2179#else
2180 (void)message;
2181#endif
2182
2183 RETURN();
2184}
2185
2186void sp_set_debug_handler(void (*handler)(const char *format, ...))
2187{
2188 TRACE("%p", handler);
2189
2190 sp_debug_handler = handler;
2191
2192 RETURN();
2193}
2194
2195void sp_default_debug_handler(const char *format, ...)
2196{
2197 va_list args;
2198 va_start(args, format);
2199 if (getenv("LIBSERIALPORT_DEBUG")) {
2200 fputs("sp: ", stderr);
2201 vfprintf(stderr, format, args);
2202 }
2203 va_end(args);
2204}
Serial port access library