serialport.c

   1 /*
   2  * This file is part of the libserialport project.
   3  *
   4  * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2010-2015 Uwe Hermann <uwe@hermann-uwe.de>
   6  * Copyright (C) 2013-2015 Martin Ling <martin-libserialport@earth.li>
   7  * Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
   8  * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
   9  *
  10  * This program is free software: you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as
  12  * published by the Free Software Foundation, either version 3 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include <config.h>
  25 #include "libserialport.h"
  26 #include "libserialport_internal.h"
  27
  28 static const struct std_baudrate std_baudrates[] = {
  29 #ifdef _WIN32
  30         /*
  31          * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
  32          * have documented CBR_* macros.
  33          */
  34         BAUD(110), BAUD(300), BAUD(600), BAUD(1200), BAUD(2400), BAUD(4800),
  35         BAUD(9600), BAUD(14400), BAUD(19200), BAUD(38400), BAUD(57600),
  36         BAUD(115200), BAUD(128000), BAUD(256000),
  37 #else
  38         BAUD(50), BAUD(75), BAUD(110), BAUD(134), BAUD(150), BAUD(200),
  39         BAUD(300), BAUD(600), BAUD(1200), BAUD(1800), BAUD(2400), BAUD(4800),
  40         BAUD(9600), BAUD(19200), BAUD(38400), BAUD(57600), BAUD(115200),
  41         BAUD(230400),
  42 #if !defined(__APPLE__) && !defined(__OpenBSD__)
  43         BAUD(460800),
  44 #endif
  45 #endif
  46 };
  47
  48 #define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
  49
  50 void (*sp_debug_handler)(const char *format, ...) = sp_default_debug_handler;
  51
  52 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
  53         struct sp_port_config *config);
  54
  55 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
  56         const struct sp_port_config *config);
  57
  58 SP_API enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
  59 {
  60         struct sp_port *port;
  61 #ifndef NO_PORT_METADATA
  62         enum sp_return ret;
  63 #endif
  64         int len;
  65
  66         TRACE("%s, %p", portname, port_ptr);
  67
  68         if (!port_ptr)
  69                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
  70
  71         *port_ptr = NULL;
  72
  73         if (!portname)
  74                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
  75
  76         DEBUG_FMT("Building structure for port %s", portname);
  77
  78 #if !defined(_WIN32) && defined(HAVE_REALPATH)
  79         /*
  80          * get_port_details() below tries to be too smart and figure out
  81          * some transport properties from the port name which breaks with
  82          * symlinks. Therefore we canonicalize the portname first.
  83          */
  84         char pathbuf[PATH_MAX + 1];
  85         char *res = realpath(portname, pathbuf);
  86         if (!res)
  87                 RETURN_ERROR(SP_ERR_ARG, "Could not retrieve realpath behind port name");
  88
  89         portname = pathbuf;
  90 #endif
  91
  92         if (!(port = malloc(sizeof(struct sp_port))))
  93                 RETURN_ERROR(SP_ERR_MEM, "Port structure malloc failed");
  94
  95         len = strlen(portname) + 1;
  96
  97         if (!(port->name = malloc(len))) {
  98                 free(port);
  99                 RETURN_ERROR(SP_ERR_MEM, "Port name malloc failed");
 100         }
 101
 102         memcpy(port->name, portname, len);
 103
 104 #ifdef _WIN32
 105         port->usb_path = NULL;
 106         port->hdl = INVALID_HANDLE_VALUE;
 107 #else
 108         port->fd = -1;
 109 #endif
 110
 111         port->description = NULL;
 112         port->transport = SP_TRANSPORT_NATIVE;
 113         port->usb_bus = -1;
 114         port->usb_address = -1;
 115         port->usb_vid = -1;
 116         port->usb_pid = -1;
 117         port->usb_manufacturer = NULL;
 118         port->usb_product = NULL;
 119         port->usb_serial = NULL;
 120         port->bluetooth_address = NULL;
 121
 122 #ifndef NO_PORT_METADATA
 123         if ((ret = get_port_details(port)) != SP_OK) {
 124                 sp_free_port(port);
 125                 return ret;
 126         }
 127 #endif
 128
 129         *port_ptr = port;
 130
 131         RETURN_OK();
 132 }
 133
 134 SP_API char *sp_get_port_name(const struct sp_port *port)
 135 {
 136         TRACE("%p", port);
 137
 138         if (!port)
 139                 return NULL;
 140
 141         RETURN_STRING(port->name);
 142 }
 143
 144 SP_API char *sp_get_port_description(const struct sp_port *port)
 145 {
 146         TRACE("%p", port);
 147
 148         if (!port || !port->description)
 149                 return NULL;
 150
 151         RETURN_STRING(port->description);
 152 }
 153
 154 SP_API enum sp_transport sp_get_port_transport(const struct sp_port *port)
 155 {
 156         TRACE("%p", port);
 157
 158         if (!port)
 159                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 160
 161         RETURN_INT(port->transport);
 162 }
 163
 164 SP_API enum sp_return sp_get_port_usb_bus_address(const struct sp_port *port,
 165                                                   int *usb_bus,int *usb_address)
 166 {
 167         TRACE("%p", port);
 168
 169         if (!port)
 170                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 171         if (port->transport != SP_TRANSPORT_USB)
 172                 RETURN_ERROR(SP_ERR_ARG, "Port does not use USB transport");
 173         if (port->usb_bus < 0 || port->usb_address < 0)
 174                 RETURN_ERROR(SP_ERR_SUPP, "Bus and address values are not available");
 175
 176         if (usb_bus)
 177                 *usb_bus = port->usb_bus;
 178         if (usb_address)
 179                 *usb_address = port->usb_address;
 180
 181         RETURN_OK();
 182 }
 183
 184 SP_API enum sp_return sp_get_port_usb_vid_pid(const struct sp_port *port,
 185                                               int *usb_vid, int *usb_pid)
 186 {
 187         TRACE("%p", port);
 188
 189         if (!port)
 190                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 191         if (port->transport != SP_TRANSPORT_USB)
 192                 RETURN_ERROR(SP_ERR_ARG, "Port does not use USB transport");
 193         if (port->usb_vid < 0 || port->usb_pid < 0)
 194                 RETURN_ERROR(SP_ERR_SUPP, "VID:PID values are not available");
 195
 196         if (usb_vid)
 197                 *usb_vid = port->usb_vid;
 198         if (usb_pid)
 199                 *usb_pid = port->usb_pid;
 200
 201         RETURN_OK();
 202 }
 203
 204 SP_API char *sp_get_port_usb_manufacturer(const struct sp_port *port)
 205 {
 206         TRACE("%p", port);
 207
 208         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_manufacturer)
 209                 return NULL;
 210
 211         RETURN_STRING(port->usb_manufacturer);
 212 }
 213
 214 SP_API char *sp_get_port_usb_product(const struct sp_port *port)
 215 {
 216         TRACE("%p", port);
 217
 218         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_product)
 219                 return NULL;
 220
 221         RETURN_STRING(port->usb_product);
 222 }
 223
 224 SP_API char *sp_get_port_usb_serial(const struct sp_port *port)
 225 {
 226         TRACE("%p", port);
 227
 228         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_serial)
 229                 return NULL;
 230
 231         RETURN_STRING(port->usb_serial);
 232 }
 233
 234 SP_API char *sp_get_port_bluetooth_address(const struct sp_port *port)
 235 {
 236         TRACE("%p", port);
 237
 238         if (!port || port->transport != SP_TRANSPORT_BLUETOOTH
 239             || !port->bluetooth_address)
 240                 return NULL;
 241
 242         RETURN_STRING(port->bluetooth_address);
 243 }
 244
 245 SP_API enum sp_return sp_get_port_handle(const struct sp_port *port,
 246                                          void *result_ptr)
 247 {
 248         TRACE("%p, %p", port, result_ptr);
 249
 250         if (!port)
 251                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 252         if (!result_ptr)
 253                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 254
 255 #ifdef _WIN32
 256         HANDLE *handle_ptr = result_ptr;
 257         *handle_ptr = port->hdl;
 258 #else
 259         int *fd_ptr = result_ptr;
 260         *fd_ptr = port->fd;
 261 #endif
 262
 263         RETURN_OK();
 264 }
 265
 266 SP_API enum sp_return sp_copy_port(const struct sp_port *port,
 267                                    struct sp_port **copy_ptr)
 268 {
 269         TRACE("%p, %p", port, copy_ptr);
 270
 271         if (!copy_ptr)
 272                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 273
 274         *copy_ptr = NULL;
 275
 276         if (!port)
 277                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 278
 279         if (!port->name)
 280                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
 281
 282         DEBUG("Copying port structure");
 283
 284         RETURN_INT(sp_get_port_by_name(port->name, copy_ptr));
 285 }
 286
 287 SP_API void sp_free_port(struct sp_port *port)
 288 {
 289         TRACE("%p", port);
 290
 291         if (!port) {
 292                 DEBUG("Null port");
 293                 RETURN();
 294         }
 295
 296         DEBUG("Freeing port structure");
 297
 298         if (port->name)
 299                 free(port->name);
 300         if (port->description)
 301                 free(port->description);
 302         if (port->usb_manufacturer)
 303                 free(port->usb_manufacturer);
 304         if (port->usb_product)
 305                 free(port->usb_product);
 306         if (port->usb_serial)
 307                 free(port->usb_serial);
 308         if (port->bluetooth_address)
 309                 free(port->bluetooth_address);
 310 #ifdef _WIN32
 311         if (port->usb_path)
 312                 free(port->usb_path);
 313 #endif
 314
 315         free(port);
 316
 317         RETURN();
 318 }
 319
 320 SP_PRIV struct sp_port **list_append(struct sp_port **list,
 321                                      const char *portname)
 322 {
 323         void *tmp;
 324         unsigned int count;
 325
 326         for (count = 0; list[count]; count++)
 327                 ;
 328         if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2))))
 329                 goto fail;
 330         list = tmp;
 331         if (sp_get_port_by_name(portname, &list[count]) != SP_OK)
 332                 goto fail;
 333         list[count + 1] = NULL;
 334         return list;
 335
 336 fail:
 337         sp_free_port_list(list);
 338         return NULL;
 339 }
 340
 341 SP_API enum sp_return sp_list_ports(struct sp_port ***list_ptr)
 342 {
 343 #ifndef NO_ENUMERATION
 344         struct sp_port **list;
 345         int ret;
 346 #endif
 347
 348         TRACE("%p", list_ptr);
 349
 350         if (!list_ptr)
 351                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 352
 353         *list_ptr = NULL;
 354
 355 #ifdef NO_ENUMERATION
 356         RETURN_ERROR(SP_ERR_SUPP, "Enumeration not supported on this platform");
 357 #else
 358         DEBUG("Enumerating ports");
 359
 360         if (!(list = malloc(sizeof(struct sp_port *))))
 361                 RETURN_ERROR(SP_ERR_MEM, "Port list malloc failed");
 362
 363         list[0] = NULL;
 364
 365         ret = list_ports(&list);
 366
 367         if (ret == SP_OK) {
 368                 *list_ptr = list;
 369         } else {
 370                 sp_free_port_list(list);
 371                 *list_ptr = NULL;
 372         }
 373
 374         RETURN_CODEVAL(ret);
 375 #endif
 376 }
 377
 378 SP_API void sp_free_port_list(struct sp_port **list)
 379 {
 380         unsigned int i;
 381
 382         TRACE("%p", list);
 383
 384         if (!list) {
 385                 DEBUG("Null list");
 386                 RETURN();
 387         }
 388
 389         DEBUG("Freeing port list");
 390
 391         for (i = 0; list[i]; i++)
 392                 sp_free_port(list[i]);
 393         free(list);
 394
 395         RETURN();
 396 }
 397
 398 #define CHECK_PORT() do { \
 399         if (!port) \
 400                 RETURN_ERROR(SP_ERR_ARG, "Null port"); \
 401         if (!port->name) \
 402                 RETURN_ERROR(SP_ERR_ARG, "Null port name"); \
 403 } while (0)
 404 #ifdef _WIN32
 405 #define CHECK_PORT_HANDLE() do { \
 406         if (port->hdl == INVALID_HANDLE_VALUE) \
 407                 RETURN_ERROR(SP_ERR_ARG, "Port not open"); \
 408 } while (0)
 409 #else
 410 #define CHECK_PORT_HANDLE() do { \
 411         if (port->fd < 0) \
 412                 RETURN_ERROR(SP_ERR_ARG, "Port not open"); \
 413 } while (0)
 414 #endif
 415 #define CHECK_OPEN_PORT() do { \
 416         CHECK_PORT(); \
 417         CHECK_PORT_HANDLE(); \
 418 } while (0)
 419
 420 #ifdef WIN32
 421 /** To be called after port receive buffer is emptied. */
 422 static enum sp_return restart_wait(struct sp_port *port)
 423 {
 424         DWORD wait_result;
 425
 426         if (port->wait_running) {
 427                 /* Check status of running wait operation. */
 428                 if (GetOverlappedResult(port->hdl, &port->wait_ovl,
 429                                 &wait_result, FALSE)) {
 430                         DEBUG("Previous wait completed");
 431                         port->wait_running = FALSE;
 432                 } else if (GetLastError() == ERROR_IO_INCOMPLETE) {
 433                         DEBUG("Previous wait still running");
 434                         RETURN_OK();
 435                 } else {
 436                         RETURN_FAIL("GetOverlappedResult() failed");
 437                 }
 438         }
 439
 440         if (!port->wait_running) {
 441                 /* Start new wait operation. */
 442                 if (WaitCommEvent(port->hdl, &port->events,
 443                                 &port->wait_ovl)) {
 444                         DEBUG("New wait returned, events already pending");
 445                 } else if (GetLastError() == ERROR_IO_PENDING) {
 446                         DEBUG("New wait running in background");
 447                         port->wait_running = TRUE;
 448                 } else {
 449                         RETURN_FAIL("WaitCommEvent() failed");
 450                 }
 451         }
 452
 453         RETURN_OK();
 454 }
 455 #endif
 456
 457 SP_API enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
 458 {
 459         struct port_data data;
 460         struct sp_port_config config;
 461         enum sp_return ret;
 462
 463         TRACE("%p, 0x%x", port, flags);
 464
 465         CHECK_PORT();
 466
 467         if (flags > SP_MODE_READ_WRITE)
 468                 RETURN_ERROR(SP_ERR_ARG, "Invalid flags");
 469
 470         DEBUG_FMT("Opening port %s", port->name);
 471
 472 #ifdef _WIN32
 473         DWORD desired_access = 0, flags_and_attributes = 0, errors;
 474         char *escaped_port_name;
 475         COMSTAT status;
 476
 477         /* Prefix port name with '\\.\' to work with ports above COM9. */
 478         if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
 479                 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
 480         sprintf(escaped_port_name, "\\\\.\\%s", port->name);
 481
 482         /* Map 'flags' to the OS-specific settings. */
 483         flags_and_attributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED;
 484         if (flags & SP_MODE_READ)
 485                 desired_access |= GENERIC_READ;
 486         if (flags & SP_MODE_WRITE)
 487                 desired_access |= GENERIC_WRITE;
 488
 489         port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0,
 490                          OPEN_EXISTING, flags_and_attributes, 0);
 491
 492         free(escaped_port_name);
 493
 494         if (port->hdl == INVALID_HANDLE_VALUE)
 495                 RETURN_FAIL("Port CreateFile() failed");
 496
 497         /* All timeouts initially disabled. */
 498         port->timeouts.ReadIntervalTimeout = 0;
 499         port->timeouts.ReadTotalTimeoutMultiplier = 0;
 500         port->timeouts.ReadTotalTimeoutConstant = 0;
 501         port->timeouts.WriteTotalTimeoutMultiplier = 0;
 502         port->timeouts.WriteTotalTimeoutConstant = 0;
 503
 504         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0) {
 505                 sp_close(port);
 506                 RETURN_FAIL("SetCommTimeouts() failed");
 507         }
 508
 509         /* Prepare OVERLAPPED structures. */
 510 #define INIT_OVERLAPPED(ovl) do { \
 511         memset(&port->ovl, 0, sizeof(port->ovl)); \
 512         port->ovl.hEvent = INVALID_HANDLE_VALUE; \
 513         if ((port->ovl.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL)) \
 514                         == INVALID_HANDLE_VALUE) { \
 515                 sp_close(port); \
 516                 RETURN_FAIL(#ovl "CreateEvent() failed"); \
 517         } \
 518 } while (0)
 519
 520         INIT_OVERLAPPED(read_ovl);
 521         INIT_OVERLAPPED(write_ovl);
 522         INIT_OVERLAPPED(wait_ovl);
 523
 524         /* Set event mask for RX and error events. */
 525         if (SetCommMask(port->hdl, EV_RXCHAR | EV_ERR) == 0) {
 526                 sp_close(port);
 527                 RETURN_FAIL("SetCommMask() failed");
 528         }
 529
 530         port->writing = FALSE;
 531         port->wait_running = FALSE;
 532
 533         ret = restart_wait(port);
 534
 535         if (ret < 0) {
 536                 sp_close(port);
 537                 RETURN_CODEVAL(ret);
 538         }
 539 #else
 540         int flags_local = O_NONBLOCK | O_NOCTTY;
 541
 542         /* Map 'flags' to the OS-specific settings. */
 543         if ((flags & SP_MODE_READ_WRITE) == SP_MODE_READ_WRITE)
 544                 flags_local |= O_RDWR;
 545         else if (flags & SP_MODE_READ)
 546                 flags_local |= O_RDONLY;
 547         else if (flags & SP_MODE_WRITE)
 548                 flags_local |= O_WRONLY;
 549
 550         if ((port->fd = open(port->name, flags_local)) < 0)
 551                 RETURN_FAIL("open() failed");
 552 #endif
 553
 554         ret = get_config(port, &data, &config);
 555
 556         if (ret < 0) {
 557                 sp_close(port);
 558                 RETURN_CODEVAL(ret);
 559         }
 560
 561         /* Set sane port settings. */
 562 #ifdef _WIN32
 563         data.dcb.fBinary = TRUE;
 564         data.dcb.fDsrSensitivity = FALSE;
 565         data.dcb.fErrorChar = FALSE;
 566         data.dcb.fNull = FALSE;
 567         data.dcb.fAbortOnError = FALSE;
 568 #else
 569         /* Turn off all fancy termios tricks, give us a raw channel. */
 570         data.term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IMAXBEL);
 571 #ifdef IUCLC
 572         data.term.c_iflag &= ~IUCLC;
 573 #endif
 574         data.term.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);
 575 #ifdef OLCUC
 576         data.term.c_oflag &= ~OLCUC;
 577 #endif
 578 #ifdef NLDLY
 579         data.term.c_oflag &= ~NLDLY;
 580 #endif
 581 #ifdef CRDLY
 582         data.term.c_oflag &= ~CRDLY;
 583 #endif
 584 #ifdef TABDLY
 585         data.term.c_oflag &= ~TABDLY;
 586 #endif
 587 #ifdef BSDLY
 588         data.term.c_oflag &= ~BSDLY;
 589 #endif
 590 #ifdef VTDLY
 591         data.term.c_oflag &= ~VTDLY;
 592 #endif
 593 #ifdef FFDLY
 594         data.term.c_oflag &= ~FFDLY;
 595 #endif
 596 #ifdef OFILL
 597         data.term.c_oflag &= ~OFILL;
 598 #endif
 599         data.term.c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN);
 600         data.term.c_cc[VMIN] = 0;
 601         data.term.c_cc[VTIME] = 0;
 602
 603         /* Ignore modem status lines; enable receiver; leave control lines alone on close. */
 604         data.term.c_cflag |= (CLOCAL | CREAD | HUPCL);
 605 #endif
 606
 607 #ifdef _WIN32
 608         if (ClearCommError(port->hdl, &errors, &status) == 0)
 609                 RETURN_FAIL("ClearCommError() failed");
 610 #endif
 611
 612         ret = set_config(port, &data, &config);
 613
 614         if (ret < 0) {
 615                 sp_close(port);
 616                 RETURN_CODEVAL(ret);
 617         }
 618
 619         RETURN_OK();
 620 }
 621
 622 SP_API enum sp_return sp_close(struct sp_port *port)
 623 {
 624         TRACE("%p", port);
 625
 626         CHECK_OPEN_PORT();
 627
 628         DEBUG_FMT("Closing port %s", port->name);
 629
 630 #ifdef _WIN32
 631         /* Returns non-zero upon success, 0 upon failure. */
 632         if (CloseHandle(port->hdl) == 0)
 633                 RETURN_FAIL("Port CloseHandle() failed");
 634         port->hdl = INVALID_HANDLE_VALUE;
 635
 636         /* Close event handles for overlapped structures. */
 637 #define CLOSE_OVERLAPPED(ovl) do { \
 638         if (port->ovl.hEvent != INVALID_HANDLE_VALUE && \
 639                 CloseHandle(port->ovl.hEvent) == 0) \
 640                 RETURN_FAIL(# ovl "event CloseHandle() failed"); \
 641 } while (0)
 642         CLOSE_OVERLAPPED(read_ovl);
 643         CLOSE_OVERLAPPED(write_ovl);
 644         CLOSE_OVERLAPPED(wait_ovl);
 645
 646 #else
 647         /* Returns 0 upon success, -1 upon failure. */
 648         if (close(port->fd) == -1)
 649                 RETURN_FAIL("close() failed");
 650         port->fd = -1;
 651 #endif
 652
 653         RETURN_OK();
 654 }
 655
 656 SP_API enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers)
 657 {
 658         TRACE("%p, 0x%x", port, buffers);
 659
 660         CHECK_OPEN_PORT();
 661
 662         if (buffers > SP_BUF_BOTH)
 663                 RETURN_ERROR(SP_ERR_ARG, "Invalid buffer selection");
 664
 665         const char *buffer_names[] = {"no", "input", "output", "both"};
 666
 667         DEBUG_FMT("Flushing %s buffers on port %s",
 668                 buffer_names[buffers], port->name);
 669
 670 #ifdef _WIN32
 671         DWORD flags = 0;
 672         if (buffers & SP_BUF_INPUT)
 673                 flags |= PURGE_RXCLEAR;
 674         if (buffers & SP_BUF_OUTPUT)
 675                 flags |= PURGE_TXCLEAR;
 676
 677         /* Returns non-zero upon success, 0 upon failure. */
 678         if (PurgeComm(port->hdl, flags) == 0)
 679                 RETURN_FAIL("PurgeComm() failed");
 680
 681         if (buffers & SP_BUF_INPUT)
 682                 TRY(restart_wait(port));
 683 #else
 684         int flags = 0;
 685         if (buffers == SP_BUF_BOTH)
 686                 flags = TCIOFLUSH;
 687         else if (buffers == SP_BUF_INPUT)
 688                 flags = TCIFLUSH;
 689         else if (buffers == SP_BUF_OUTPUT)
 690                 flags = TCOFLUSH;
 691
 692         /* Returns 0 upon success, -1 upon failure. */
 693         if (tcflush(port->fd, flags) < 0)
 694                 RETURN_FAIL("tcflush() failed");
 695 #endif
 696         RETURN_OK();
 697 }
 698
 699 SP_API enum sp_return sp_drain(struct sp_port *port)
 700 {
 701         TRACE("%p", port);
 702
 703         CHECK_OPEN_PORT();
 704
 705         DEBUG_FMT("Draining port %s", port->name);
 706
 707 #ifdef _WIN32
 708         /* Returns non-zero upon success, 0 upon failure. */
 709         if (FlushFileBuffers(port->hdl) == 0)
 710                 RETURN_FAIL("FlushFileBuffers() failed");
 711         RETURN_OK();
 712 #else
 713         int result;
 714         while (1) {
 715 #ifdef __ANDROID__
 716                 int arg = 1;
 717                 result = ioctl(port->fd, TCSBRK, &arg);
 718 #else
 719                 result = tcdrain(port->fd);
 720 #endif
 721                 if (result < 0) {
 722                         if (errno == EINTR) {
 723                                 DEBUG("tcdrain() was interrupted");
 724                                 continue;
 725                         } else {
 726                                 RETURN_FAIL("tcdrain() failed");
 727                         }
 728                 } else {
 729                         RETURN_OK();
 730                 }
 731         }
 732 #endif
 733 }
 734
 735 #ifdef _WIN32
 736 static enum sp_return await_write_completion(struct sp_port *port)
 737 {
 738         TRACE("%p", port);
 739         DWORD bytes_written;
 740         BOOL result;
 741
 742         /* Wait for previous non-blocking write to complete, if any. */
 743         if (port->writing) {
 744                 DEBUG("Waiting for previous write to complete");
 745                 result = GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
 746                 port->writing = 0;
 747                 if (!result)
 748                         RETURN_FAIL("Previous write failed to complete");
 749                 DEBUG("Previous write completed");
 750         }
 751
 752         RETURN_OK();
 753 }
 754 #endif
 755
 756 SP_API enum sp_return sp_blocking_write(struct sp_port *port, const void *buf,
 757                                         size_t count, unsigned int timeout_ms)
 758 {
 759         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 760
 761         CHECK_OPEN_PORT();
 762
 763         if (!buf)
 764                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 765
 766         if (timeout_ms)
 767                 DEBUG_FMT("Writing %d bytes to port %s, timeout %d ms",
 768                         count, port->name, timeout_ms);
 769         else
 770                 DEBUG_FMT("Writing %d bytes to port %s, no timeout",
 771                         count, port->name);
 772
 773         if (count == 0)
 774                 RETURN_INT(0);
 775
 776 #ifdef _WIN32
 777         DWORD bytes_written = 0;
 778
 779         TRY(await_write_completion(port));
 780
 781         /* Set timeout. */
 782         if (port->timeouts.WriteTotalTimeoutConstant != timeout_ms) {
 783                 port->timeouts.WriteTotalTimeoutConstant = timeout_ms;
 784                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 785                         RETURN_FAIL("SetCommTimeouts() failed");
 786         }
 787
 788         /* Start write. */
 789         if (WriteFile(port->hdl, buf, count, NULL, &port->write_ovl)) {
 790                 DEBUG("Write completed immediately");
 791                 RETURN_INT(count);
 792         } else if (GetLastError() == ERROR_IO_PENDING) {
 793                 DEBUG("Waiting for write to complete");
 794                 if (GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE) == 0) {
 795                         if (GetLastError() == ERROR_SEM_TIMEOUT) {
 796                                 DEBUG("Write timed out");
 797                                 RETURN_INT(0);
 798                         } else {
 799                                 RETURN_FAIL("GetOverlappedResult() failed");
 800                         }
 801                 }
 802                 DEBUG_FMT("Write completed, %d/%d bytes written", bytes_written, count);
 803                 RETURN_INT(bytes_written);
 804         } else {
 805                 RETURN_FAIL("WriteFile() failed");
 806         }
 807 #else
 808         size_t bytes_written = 0;
 809         unsigned char *ptr = (unsigned char *) buf;
 810         struct timeval start, delta, now, end = {0, 0};
 811         int started = 0;
 812         fd_set fds;
 813         int result;
 814
 815         if (timeout_ms) {
 816                 /* Get time at start of operation. */
 817                 gettimeofday(&start, NULL);
 818                 /* Define duration of timeout. */
 819                 delta.tv_sec = timeout_ms / 1000;
 820                 delta.tv_usec = (timeout_ms % 1000) * 1000;
 821                 /* Calculate time at which we should give up. */
 822                 timeradd(&start, &delta, &end);
 823         }
 824
 825         FD_ZERO(&fds);
 826         FD_SET(port->fd, &fds);
 827
 828         /* Loop until we have written the requested number of bytes. */
 829         while (bytes_written < count) {
 830                 /*
 831                  * Check timeout only if we have run select() at least once,
 832                  * to avoid any issues if a short timeout is reached before
 833                  * select() is even run.
 834                  */
 835                 if (timeout_ms && started) {
 836                         gettimeofday(&now, NULL);
 837                         if (timercmp(&now, &end, >))
 838                                 /* Timeout has expired. */
 839                                 break;
 840                         timersub(&end, &now, &delta);
 841                 }
 842                 result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &delta : NULL);
 843                 started = 1;
 844                 if (result < 0) {
 845                         if (errno == EINTR) {
 846                                 DEBUG("select() call was interrupted, repeating");
 847                                 continue;
 848                         } else {
 849                                 RETURN_FAIL("select() failed");
 850                         }
 851                 } else if (result == 0) {
 852                         /* Timeout has expired. */
 853                         break;
 854                 }
 855
 856                 /* Do write. */
 857                 result = write(port->fd, ptr, count - bytes_written);
 858
 859                 if (result < 0) {
 860                         if (errno == EAGAIN)
 861                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
 862                                 continue;
 863                         else
 864                                 /* This is an actual failure. */
 865                                 RETURN_FAIL("write() failed");
 866                 }
 867
 868                 bytes_written += result;
 869                 ptr += result;
 870         }
 871
 872         if (bytes_written < count)
 873                 DEBUG("Write timed out");
 874
 875         RETURN_INT(bytes_written);
 876 #endif
 877 }
 878
 879 SP_API enum sp_return sp_nonblocking_write(struct sp_port *port,
 880                                            const void *buf, size_t count)
 881 {
 882         TRACE("%p, %p, %d", port, buf, count);
 883
 884         CHECK_OPEN_PORT();
 885
 886         if (!buf)
 887                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 888
 889         DEBUG_FMT("Writing up to %d bytes to port %s", count, port->name);
 890
 891         if (count == 0)
 892                 RETURN_INT(0);
 893
 894 #ifdef _WIN32
 895         DWORD written = 0;
 896         BYTE *ptr = (BYTE *) buf;
 897
 898         /* Check whether previous write is complete. */
 899         if (port->writing) {
 900                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 901                         DEBUG("Previous write completed");
 902                         port->writing = 0;
 903                 } else {
 904                         DEBUG("Previous write not complete");
 905                         /* Can't take a new write until the previous one finishes. */
 906                         RETURN_INT(0);
 907                 }
 908         }
 909
 910         /* Set timeout. */
 911         if (port->timeouts.WriteTotalTimeoutConstant != 0) {
 912                 port->timeouts.WriteTotalTimeoutConstant = 0;
 913                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 914                         RETURN_FAIL("SetCommTimeouts() failed");
 915         }
 916
 917         /*
 918          * Keep writing data until the OS has to actually start an async IO
 919          * for it. At that point we know the buffer is full.
 920          */
 921         while (written < count) {
 922                 /* Copy first byte of user buffer. */
 923                 port->pending_byte = *ptr++;
 924
 925                 /* Start asynchronous write. */
 926                 if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
 927                         if (GetLastError() == ERROR_IO_PENDING) {
 928                                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 929                                         DEBUG("Asynchronous write completed immediately");
 930                                         port->writing = 0;
 931                                         written++;
 932                                         continue;
 933                                 } else {
 934                                         DEBUG("Asynchronous write running");
 935                                         port->writing = 1;
 936                                         RETURN_INT(++written);
 937                                 }
 938                         } else {
 939                                 /* Actual failure of some kind. */
 940                                 RETURN_FAIL("WriteFile() failed");
 941                         }
 942                 } else {
 943                         DEBUG("Single byte written immediately");
 944                         written++;
 945                 }
 946         }
 947
 948         DEBUG("All bytes written immediately");
 949
 950         RETURN_INT(written);
 951 #else
 952         /* Returns the number of bytes written, or -1 upon failure. */
 953         ssize_t written = write(port->fd, buf, count);
 954
 955         if (written < 0) {
 956                 if (errno == EAGAIN)
 957                         // Buffer is full, no bytes written.
 958                         RETURN_INT(0);
 959                 else
 960                         RETURN_FAIL("write() failed");
 961         } else {
 962                 RETURN_INT(written);
 963         }
 964 #endif
 965 }
 966
 967 #ifdef _WIN32
 968 /* Restart wait operation if buffer was emptied. */
 969 static enum sp_return restart_wait_if_needed(struct sp_port *port, unsigned int bytes_read)
 970 {
 971         DWORD errors;
 972         COMSTAT comstat;
 973
 974         if (bytes_read == 0)
 975                 RETURN_OK();
 976
 977         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
 978                 RETURN_FAIL("ClearCommError() failed");
 979
 980         if (comstat.cbInQue == 0)
 981                 TRY(restart_wait(port));
 982
 983         RETURN_OK();
 984 }
 985 #endif
 986
 987 SP_API enum sp_return sp_blocking_read(struct sp_port *port, void *buf,
 988                                        size_t count, unsigned int timeout_ms)
 989 {
 990         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 991
 992         CHECK_OPEN_PORT();
 993
 994         if (!buf)
 995                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 996
 997         if (timeout_ms)
 998                 DEBUG_FMT("Reading %d bytes from port %s, timeout %d ms",
 999                         count, port->name, timeout_ms);
1000         else
1001                 DEBUG_FMT("Reading %d bytes from port %s, no timeout",
1002                         count, port->name);
1003
1004         if (count == 0)
1005                 RETURN_INT(0);
1006
1007 #ifdef _WIN32
1008         DWORD bytes_read = 0;
1009
1010         /* Set timeout. */
1011         if (port->timeouts.ReadIntervalTimeout != 0 ||
1012                         port->timeouts.ReadTotalTimeoutMultiplier != 0 ||
1013                         port->timeouts.ReadTotalTimeoutConstant != timeout_ms) {
1014                 port->timeouts.ReadIntervalTimeout = 0;
1015                 port->timeouts.ReadTotalTimeoutMultiplier = 0;
1016                 port->timeouts.ReadTotalTimeoutConstant = timeout_ms;
1017                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1018                         RETURN_FAIL("SetCommTimeouts() failed");
1019         }
1020
1021         /* Start read. */
1022         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl)) {
1023                 DEBUG("Read completed immediately");
1024                 bytes_read = count;
1025         } else if (GetLastError() == ERROR_IO_PENDING) {
1026                 DEBUG("Waiting for read to complete");
1027                 if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1028                         RETURN_FAIL("GetOverlappedResult() failed");
1029                 DEBUG_FMT("Read completed, %d/%d bytes read", bytes_read, count);
1030         } else {
1031                 RETURN_FAIL("ReadFile() failed");
1032         }
1033
1034         TRY(restart_wait_if_needed(port, bytes_read));
1035
1036         RETURN_INT(bytes_read);
1037
1038 #else
1039         size_t bytes_read = 0;
1040         unsigned char *ptr = (unsigned char *)buf;
1041         struct timeval start, delta, now, end = {0, 0};
1042         int started = 0;
1043         fd_set fds;
1044         int result;
1045
1046         if (timeout_ms) {
1047                 /* Get time at start of operation. */
1048                 gettimeofday(&start, NULL);
1049                 /* Define duration of timeout. */
1050                 delta.tv_sec = timeout_ms / 1000;
1051                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1052                 /* Calculate time at which we should give up. */
1053                 timeradd(&start, &delta, &end);
1054         }
1055
1056         FD_ZERO(&fds);
1057         FD_SET(port->fd, &fds);
1058
1059         /* Loop until we have the requested number of bytes. */
1060         while (bytes_read < count) {
1061                 /*
1062                  * Check timeout only if we have run select() at least once,
1063                  * to avoid any issues if a short timeout is reached before
1064                  * select() is even run.
1065                  */
1066                 if (timeout_ms && started) {
1067                         gettimeofday(&now, NULL);
1068                         if (timercmp(&now, &end, >))
1069                                 /* Timeout has expired. */
1070                                 break;
1071                         timersub(&end, &now, &delta);
1072                 }
1073                 result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
1074                 started = 1;
1075                 if (result < 0) {
1076                         if (errno == EINTR) {
1077                                 DEBUG("select() call was interrupted, repeating");
1078                                 continue;
1079                         } else {
1080                                 RETURN_FAIL("select() failed");
1081                         }
1082                 } else if (result == 0) {
1083                         /* Timeout has expired. */
1084                         break;
1085                 }
1086
1087                 /* Do read. */
1088                 result = read(port->fd, ptr, count - bytes_read);
1089
1090                 if (result < 0) {
1091                         if (errno == EAGAIN)
1092                                 /*
1093                                  * This shouldn't happen because we did a
1094                                  * select() first, but handle anyway.
1095                                  */
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         if (bytes_read < count)
1107                 DEBUG("Read timed out");
1108
1109         RETURN_INT(bytes_read);
1110 #endif
1111 }
1112
1113 SP_API enum sp_return sp_blocking_read_next(struct sp_port *port, void *buf,
1114                                             size_t count, unsigned int timeout_ms)
1115 {
1116         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
1117
1118         CHECK_OPEN_PORT();
1119
1120         if (!buf)
1121                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1122
1123         if (count == 0)
1124                 RETURN_ERROR(SP_ERR_ARG, "Zero count");
1125
1126         if (timeout_ms)
1127                 DEBUG_FMT("Reading next max %d bytes from port %s, timeout %d ms",
1128                         count, port->name, timeout_ms);
1129         else
1130                 DEBUG_FMT("Reading next max %d bytes from port %s, no timeout",
1131                         count, port->name);
1132
1133 #ifdef _WIN32
1134         DWORD bytes_read = 0;
1135
1136         /* If timeout_ms == 0, set maximum timeout. */
1137         DWORD timeout_val = (timeout_ms == 0 ? MAXDWORD - 1 : timeout_ms);
1138
1139         /* Set timeout. */
1140         if (port->timeouts.ReadIntervalTimeout != MAXDWORD ||
1141                         port->timeouts.ReadTotalTimeoutMultiplier != MAXDWORD ||
1142                         port->timeouts.ReadTotalTimeoutConstant != timeout_val) {
1143                 port->timeouts.ReadIntervalTimeout = MAXDWORD;
1144                 port->timeouts.ReadTotalTimeoutMultiplier = MAXDWORD;
1145                 port->timeouts.ReadTotalTimeoutConstant = timeout_val;
1146                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1147                         RETURN_FAIL("SetCommTimeouts() failed");
1148         }
1149
1150         /* Loop until we have at least one byte, or timeout is reached. */
1151         while (bytes_read == 0) {
1152                 /* Start read. */
1153                 if (ReadFile(port->hdl, buf, count, &bytes_read, &port->read_ovl)) {
1154                         DEBUG("Read completed immediately");
1155                 } else if (GetLastError() == ERROR_IO_PENDING) {
1156                         DEBUG("Waiting for read to complete");
1157                         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1158                                 RETURN_FAIL("GetOverlappedResult() failed");
1159                         if (bytes_read > 0) {
1160                                 DEBUG("Read completed");
1161                         } else if (timeout_ms > 0) {
1162                                 DEBUG("Read timed out");
1163                                 break;
1164                         } else {
1165                                 DEBUG("Restarting read");
1166                         }
1167                 } else {
1168                         RETURN_FAIL("ReadFile() failed");
1169                 }
1170         }
1171
1172         TRY(restart_wait_if_needed(port, bytes_read));
1173
1174         RETURN_INT(bytes_read);
1175
1176 #else
1177         size_t bytes_read = 0;
1178         struct timeval start, delta, now, end = {0, 0};
1179         int started = 0;
1180         fd_set fds;
1181         int result;
1182
1183         if (timeout_ms) {
1184                 /* Get time at start of operation. */
1185                 gettimeofday(&start, NULL);
1186                 /* Define duration of timeout. */
1187                 delta.tv_sec = timeout_ms / 1000;
1188                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1189                 /* Calculate time at which we should give up. */
1190                 timeradd(&start, &delta, &end);
1191         }
1192
1193         FD_ZERO(&fds);
1194         FD_SET(port->fd, &fds);
1195
1196         /* Loop until we have at least one byte, or timeout is reached. */
1197         while (bytes_read == 0) {
1198                 /*
1199                  * Check timeout only if we have run select() at least once,
1200                  * to avoid any issues if a short timeout is reached before
1201                  * select() is even run.
1202                  */
1203                 if (timeout_ms && started) {
1204                         gettimeofday(&now, NULL);
1205                         if (timercmp(&now, &end, >))
1206                                 /* Timeout has expired. */
1207                                 break;
1208                         timersub(&end, &now, &delta);
1209                 }
1210                 result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
1211                 started = 1;
1212                 if (result < 0) {
1213                         if (errno == EINTR) {
1214                                 DEBUG("select() call was interrupted, repeating");
1215                                 continue;
1216                         } else {
1217                                 RETURN_FAIL("select() failed");
1218                         }
1219                 } else if (result == 0) {
1220                         /* Timeout has expired. */
1221                         break;
1222                 }
1223
1224                 /* Do read. */
1225                 result = read(port->fd, buf, count);
1226
1227                 if (result < 0) {
1228                         if (errno == EAGAIN)
1229                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
1230                                 continue;
1231                         else
1232                                 /* This is an actual failure. */
1233                                 RETURN_FAIL("read() failed");
1234                 }
1235
1236                 bytes_read = result;
1237         }
1238
1239         if (bytes_read == 0)
1240                 DEBUG("Read timed out");
1241
1242         RETURN_INT(bytes_read);
1243 #endif
1244 }
1245
1246 SP_API enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf,
1247                                           size_t count)
1248 {
1249         TRACE("%p, %p, %d", port, buf, count);
1250
1251         CHECK_OPEN_PORT();
1252
1253         if (!buf)
1254                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1255
1256         DEBUG_FMT("Reading up to %d bytes from port %s", count, port->name);
1257
1258 #ifdef _WIN32
1259         DWORD bytes_read;
1260
1261         /* Set timeout. */
1262         if (port->timeouts.ReadIntervalTimeout != MAXDWORD ||
1263                         port->timeouts.ReadTotalTimeoutMultiplier != 0 ||
1264                         port->timeouts.ReadTotalTimeoutConstant != 0) {
1265                 port->timeouts.ReadIntervalTimeout = MAXDWORD;
1266                 port->timeouts.ReadTotalTimeoutMultiplier = 0;
1267                 port->timeouts.ReadTotalTimeoutConstant = 0;
1268                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1269                         RETURN_FAIL("SetCommTimeouts() failed");
1270         }
1271
1272         /* Do read. */
1273         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0)
1274                 if (GetLastError() != ERROR_IO_PENDING)
1275                         RETURN_FAIL("ReadFile() failed");
1276
1277         /* Get number of bytes read. */
1278         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, FALSE) == 0)
1279                 RETURN_FAIL("GetOverlappedResult() failed");
1280
1281         TRY(restart_wait_if_needed(port, bytes_read));
1282
1283         RETURN_INT(bytes_read);
1284 #else
1285         ssize_t bytes_read;
1286
1287         /* Returns the number of bytes read, or -1 upon failure. */
1288         if ((bytes_read = read(port->fd, buf, count)) < 0) {
1289                 if (errno == EAGAIN)
1290                         /* No bytes available. */
1291                         bytes_read = 0;
1292                 else
1293                         /* This is an actual failure. */
1294                         RETURN_FAIL("read() failed");
1295         }
1296         RETURN_INT(bytes_read);
1297 #endif
1298 }
1299
1300 SP_API enum sp_return sp_input_waiting(struct sp_port *port)
1301 {
1302         TRACE("%p", port);
1303
1304         CHECK_OPEN_PORT();
1305
1306         DEBUG_FMT("Checking input bytes waiting on port %s", port->name);
1307
1308 #ifdef _WIN32
1309         DWORD errors;
1310         COMSTAT comstat;
1311
1312         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1313                 RETURN_FAIL("ClearCommError() failed");
1314         RETURN_INT(comstat.cbInQue);
1315 #else
1316         int bytes_waiting;
1317         if (ioctl(port->fd, TIOCINQ, &bytes_waiting) < 0)
1318                 RETURN_FAIL("TIOCINQ ioctl failed");
1319         RETURN_INT(bytes_waiting);
1320 #endif
1321 }
1322
1323 SP_API enum sp_return sp_output_waiting(struct sp_port *port)
1324 {
1325         TRACE("%p", port);
1326
1327         CHECK_OPEN_PORT();
1328
1329         DEBUG_FMT("Checking output bytes waiting on port %s", port->name);
1330
1331 #ifdef _WIN32
1332         DWORD errors;
1333         COMSTAT comstat;
1334
1335         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1336                 RETURN_FAIL("ClearCommError() failed");
1337         RETURN_INT(comstat.cbOutQue);
1338 #else
1339         int bytes_waiting;
1340         if (ioctl(port->fd, TIOCOUTQ, &bytes_waiting) < 0)
1341                 RETURN_FAIL("TIOCOUTQ ioctl failed");
1342         RETURN_INT(bytes_waiting);
1343 #endif
1344 }
1345
1346 SP_API enum sp_return sp_new_event_set(struct sp_event_set **result_ptr)
1347 {
1348         struct sp_event_set *result;
1349
1350         TRACE("%p", result_ptr);
1351
1352         if (!result_ptr)
1353                 RETURN_ERROR(SP_ERR_ARG, "Null result");
1354
1355         *result_ptr = NULL;
1356
1357         if (!(result = malloc(sizeof(struct sp_event_set))))
1358                 RETURN_ERROR(SP_ERR_MEM, "sp_event_set malloc() failed");
1359
1360         memset(result, 0, sizeof(struct sp_event_set));
1361
1362         *result_ptr = result;
1363
1364         RETURN_OK();
1365 }
1366
1367 static enum sp_return add_handle(struct sp_event_set *event_set,
1368                 event_handle handle, enum sp_event mask)
1369 {
1370         void *new_handles;
1371         enum sp_event *new_masks;
1372
1373         TRACE("%p, %d, %d", event_set, handle, mask);
1374
1375         if (!(new_handles = realloc(event_set->handles,
1376                         sizeof(event_handle) * (event_set->count + 1))))
1377                 RETURN_ERROR(SP_ERR_MEM, "Handle array realloc() failed");
1378
1379         event_set->handles = new_handles;
1380
1381         if (!(new_masks = realloc(event_set->masks,
1382                         sizeof(enum sp_event) * (event_set->count + 1))))
1383                 RETURN_ERROR(SP_ERR_MEM, "Mask array realloc() failed");
1384
1385         event_set->masks = new_masks;
1386
1387         ((event_handle *) event_set->handles)[event_set->count] = handle;
1388         event_set->masks[event_set->count] = mask;
1389
1390         event_set->count++;
1391
1392         RETURN_OK();
1393 }
1394
1395 SP_API enum sp_return sp_add_port_events(struct sp_event_set *event_set,
1396         const struct sp_port *port, enum sp_event mask)
1397 {
1398         TRACE("%p, %p, %d", event_set, port, mask);
1399
1400         if (!event_set)
1401                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1402
1403         if (!port)
1404                 RETURN_ERROR(SP_ERR_ARG, "Null port");
1405
1406         if (mask > (SP_EVENT_RX_READY | SP_EVENT_TX_READY | SP_EVENT_ERROR))
1407                 RETURN_ERROR(SP_ERR_ARG, "Invalid event mask");
1408
1409         if (!mask)
1410                 RETURN_OK();
1411
1412 #ifdef _WIN32
1413         enum sp_event handle_mask;
1414         if ((handle_mask = mask & SP_EVENT_TX_READY))
1415                 TRY(add_handle(event_set, port->write_ovl.hEvent, handle_mask));
1416         if ((handle_mask = mask & (SP_EVENT_RX_READY | SP_EVENT_ERROR)))
1417                 TRY(add_handle(event_set, port->wait_ovl.hEvent, handle_mask));
1418 #else
1419         TRY(add_handle(event_set, port->fd, mask));
1420 #endif
1421
1422         RETURN_OK();
1423 }
1424
1425 SP_API void sp_free_event_set(struct sp_event_set *event_set)
1426 {
1427         TRACE("%p", event_set);
1428
1429         if (!event_set) {
1430                 DEBUG("Null event set");
1431                 RETURN();
1432         }
1433
1434         DEBUG("Freeing event set");
1435
1436         if (event_set->handles)
1437                 free(event_set->handles);
1438         if (event_set->masks)
1439                 free(event_set->masks);
1440
1441         free(event_set);
1442
1443         RETURN();
1444 }
1445
1446 SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
1447                               unsigned int timeout_ms)
1448 {
1449         TRACE("%p, %d", event_set, timeout_ms);
1450
1451         if (!event_set)
1452                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1453
1454 #ifdef _WIN32
1455         if (WaitForMultipleObjects(event_set->count, event_set->handles, FALSE,
1456                         timeout_ms ? timeout_ms : INFINITE) == WAIT_FAILED)
1457                 RETURN_FAIL("WaitForMultipleObjects() failed");
1458
1459         RETURN_OK();
1460 #else
1461         struct timeval start, delta, now, end = {0, 0};
1462         const struct timeval max_delta = {
1463                 (INT_MAX / 1000), (INT_MAX % 1000) * 1000
1464         };
1465         int started = 0, timeout_overflow = 0;
1466         int result, timeout_remaining_ms;
1467         struct pollfd *pollfds;
1468         unsigned int i;
1469
1470         if (!(pollfds = malloc(sizeof(struct pollfd) * event_set->count)))
1471                 RETURN_ERROR(SP_ERR_MEM, "pollfds malloc() failed");
1472
1473         for (i = 0; i < event_set->count; i++) {
1474                 pollfds[i].fd = ((int *)event_set->handles)[i];
1475                 pollfds[i].events = 0;
1476                 pollfds[i].revents = 0;
1477                 if (event_set->masks[i] & SP_EVENT_RX_READY)
1478                         pollfds[i].events |= POLLIN;
1479                 if (event_set->masks[i] & SP_EVENT_TX_READY)
1480                         pollfds[i].events |= POLLOUT;
1481                 if (event_set->masks[i] & SP_EVENT_ERROR)
1482                         pollfds[i].events |= POLLERR;
1483         }
1484
1485         if (timeout_ms) {
1486                 /* Get time at start of operation. */
1487                 gettimeofday(&start, NULL);
1488                 /* Define duration of timeout. */
1489                 delta.tv_sec = timeout_ms / 1000;
1490                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1491                 /* Calculate time at which we should give up. */
1492                 timeradd(&start, &delta, &end);
1493         }
1494
1495         /* Loop until an event occurs. */
1496         while (1) {
1497                 /*
1498                  * Check timeout only if we have run poll() at least once,
1499                  * to avoid any issues if a short timeout is reached before
1500                  * poll() is even run.
1501                  */
1502                 if (!timeout_ms) {
1503                         timeout_remaining_ms = -1;
1504                 } else if (!started) {
1505                         timeout_overflow = (timeout_ms > INT_MAX);
1506                         timeout_remaining_ms = timeout_overflow ? INT_MAX : timeout_ms;
1507                 } else {
1508                         gettimeofday(&now, NULL);
1509                         if (timercmp(&now, &end, >)) {
1510                                 DEBUG("Wait timed out");
1511                                 break;
1512                         }
1513                         timersub(&end, &now, &delta);
1514                         if ((timeout_overflow = timercmp(&delta, &max_delta, >)))
1515                                 delta = max_delta;
1516                         timeout_remaining_ms = delta.tv_sec * 1000 + delta.tv_usec / 1000;
1517                 }
1518
1519                 result = poll(pollfds, event_set->count, timeout_remaining_ms);
1520                 started = 1;
1521
1522                 if (result < 0) {
1523                         if (errno == EINTR) {
1524                                 DEBUG("poll() call was interrupted, repeating");
1525                                 continue;
1526                         } else {
1527                                 free(pollfds);
1528                                 RETURN_FAIL("poll() failed");
1529                         }
1530                 } else if (result == 0) {
1531                         DEBUG("poll() timed out");
1532                         if (!timeout_overflow)
1533                                 break;
1534                 } else {
1535                         DEBUG("poll() completed");
1536                         break;
1537                 }
1538         }
1539
1540         free(pollfds);
1541         RETURN_OK();
1542 #endif
1543 }
1544
1545 #ifdef USE_TERMIOS_SPEED
1546 static enum sp_return get_baudrate(int fd, int *baudrate)
1547 {
1548         void *data;
1549
1550         TRACE("%d, %p", fd, baudrate);
1551
1552         DEBUG("Getting baud rate");
1553
1554         if (!(data = malloc(get_termios_size())))
1555                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1556
1557         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1558                 free(data);
1559                 RETURN_FAIL("Getting termios failed");
1560         }
1561
1562         *baudrate = get_termios_speed(data);
1563
1564         free(data);
1565
1566         RETURN_OK();
1567 }
1568
1569 static enum sp_return set_baudrate(int fd, int baudrate)
1570 {
1571         void *data;
1572
1573         TRACE("%d, %d", fd, baudrate);
1574
1575         DEBUG("Getting baud rate");
1576
1577         if (!(data = malloc(get_termios_size())))
1578                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1579
1580         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1581                 free(data);
1582                 RETURN_FAIL("Getting termios failed");
1583         }
1584
1585         DEBUG("Setting baud rate");
1586
1587         set_termios_speed(data, baudrate);
1588
1589         if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
1590                 free(data);
1591                 RETURN_FAIL("Setting termios failed");
1592         }
1593
1594         free(data);
1595
1596         RETURN_OK();
1597 }
1598 #endif /* USE_TERMIOS_SPEED */
1599
1600 #ifdef USE_TERMIOX
1601 static enum sp_return get_flow(int fd, struct port_data *data)
1602 {
1603         void *termx;
1604
1605         TRACE("%d, %p", fd, data);
1606
1607         DEBUG("Getting advanced flow control");
1608
1609         if (!(termx = malloc(get_termiox_size())))
1610                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1611
1612         if (ioctl(fd, TCGETX, termx) < 0) {
1613                 free(termx);
1614                 RETURN_FAIL("Getting termiox failed");
1615         }
1616
1617         get_termiox_flow(termx, &data->rts_flow, &data->cts_flow,
1618                         &data->dtr_flow, &data->dsr_flow);
1619
1620         free(termx);
1621
1622         RETURN_OK();
1623 }
1624
1625 static enum sp_return set_flow(int fd, struct port_data *data)
1626 {
1627         void *termx;
1628
1629         TRACE("%d, %p", fd, data);
1630
1631         DEBUG("Getting advanced flow control");
1632
1633         if (!(termx = malloc(get_termiox_size())))
1634                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1635
1636         if (ioctl(fd, TCGETX, termx) < 0) {
1637                 free(termx);
1638                 RETURN_FAIL("Getting termiox failed");
1639         }
1640
1641         DEBUG("Setting advanced flow control");
1642
1643         set_termiox_flow(termx, data->rts_flow, data->cts_flow,
1644                         data->dtr_flow, data->dsr_flow);
1645
1646         if (ioctl(fd, TCSETX, termx) < 0) {
1647                 free(termx);
1648                 RETURN_FAIL("Setting termiox failed");
1649         }
1650
1651         free(termx);
1652
1653         RETURN_OK();
1654 }
1655 #endif /* USE_TERMIOX */
1656
1657 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
1658         struct sp_port_config *config)
1659 {
1660         unsigned int i;
1661
1662         TRACE("%p, %p, %p", port, data, config);
1663
1664         DEBUG_FMT("Getting configuration for port %s", port->name);
1665
1666 #ifdef _WIN32
1667         if (!GetCommState(port->hdl, &data->dcb))
1668                 RETURN_FAIL("GetCommState() failed");
1669
1670         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1671                 if (data->dcb.BaudRate == std_baudrates[i].index) {
1672                         config->baudrate = std_baudrates[i].value;
1673                         break;
1674                 }
1675         }
1676
1677         if (i == NUM_STD_BAUDRATES)
1678                 /* BaudRate field can be either an index or a custom baud rate. */
1679                 config->baudrate = data->dcb.BaudRate;
1680
1681         config->bits = data->dcb.ByteSize;
1682
1683         if (data->dcb.fParity)
1684                 switch (data->dcb.Parity) {
1685                 case NOPARITY:
1686                         config->parity = SP_PARITY_NONE;
1687                         break;
1688                 case ODDPARITY:
1689                         config->parity = SP_PARITY_ODD;
1690                         break;
1691                 case EVENPARITY:
1692                         config->parity = SP_PARITY_EVEN;
1693                         break;
1694                 case MARKPARITY:
1695                         config->parity = SP_PARITY_MARK;
1696                         break;
1697                 case SPACEPARITY:
1698                         config->parity = SP_PARITY_SPACE;
1699                         break;
1700                 default:
1701                         config->parity = -1;
1702                 }
1703         else
1704                 config->parity = SP_PARITY_NONE;
1705
1706         switch (data->dcb.StopBits) {
1707         case ONESTOPBIT:
1708                 config->stopbits = 1;
1709                 break;
1710         case TWOSTOPBITS:
1711                 config->stopbits = 2;
1712                 break;
1713         default:
1714                 config->stopbits = -1;
1715         }
1716
1717         switch (data->dcb.fRtsControl) {
1718         case RTS_CONTROL_DISABLE:
1719                 config->rts = SP_RTS_OFF;
1720                 break;
1721         case RTS_CONTROL_ENABLE:
1722                 config->rts = SP_RTS_ON;
1723                 break;
1724         case RTS_CONTROL_HANDSHAKE:
1725                 config->rts = SP_RTS_FLOW_CONTROL;
1726                 break;
1727         default:
1728                 config->rts = -1;
1729         }
1730
1731         config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1732
1733         switch (data->dcb.fDtrControl) {
1734         case DTR_CONTROL_DISABLE:
1735                 config->dtr = SP_DTR_OFF;
1736                 break;
1737         case DTR_CONTROL_ENABLE:
1738                 config->dtr = SP_DTR_ON;
1739                 break;
1740         case DTR_CONTROL_HANDSHAKE:
1741                 config->dtr = SP_DTR_FLOW_CONTROL;
1742                 break;
1743         default:
1744                 config->dtr = -1;
1745         }
1746
1747         config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1748
1749         if (data->dcb.fInX) {
1750                 if (data->dcb.fOutX)
1751                         config->xon_xoff = SP_XONXOFF_INOUT;
1752                 else
1753                         config->xon_xoff = SP_XONXOFF_IN;
1754         } else {
1755                 if (data->dcb.fOutX)
1756                         config->xon_xoff = SP_XONXOFF_OUT;
1757                 else
1758                         config->xon_xoff = SP_XONXOFF_DISABLED;
1759         }
1760
1761 #else // !_WIN32
1762
1763         if (tcgetattr(port->fd, &data->term) < 0)
1764                 RETURN_FAIL("tcgetattr() failed");
1765
1766         if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
1767                 RETURN_FAIL("TIOCMGET ioctl failed");
1768
1769 #ifdef USE_TERMIOX
1770         int ret = get_flow(port->fd, data);
1771
1772         if (ret == SP_ERR_FAIL && errno == EINVAL)
1773                 data->termiox_supported = 0;
1774         else if (ret < 0)
1775                 RETURN_CODEVAL(ret);
1776         else
1777                 data->termiox_supported = 1;
1778 #else
1779         data->termiox_supported = 0;
1780 #endif
1781
1782         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1783                 if (cfgetispeed(&data->term) == std_baudrates[i].index) {
1784                         config->baudrate = std_baudrates[i].value;
1785                         break;
1786                 }
1787         }
1788
1789         if (i == NUM_STD_BAUDRATES) {
1790 #ifdef __APPLE__
1791                 config->baudrate = (int)data->term.c_ispeed;
1792 #elif defined(USE_TERMIOS_SPEED)
1793                 TRY(get_baudrate(port->fd, &config->baudrate));
1794 #else
1795                 config->baudrate = -1;
1796 #endif
1797         }
1798
1799         switch (data->term.c_cflag & CSIZE) {
1800         case CS8:
1801                 config->bits = 8;
1802                 break;
1803         case CS7:
1804                 config->bits = 7;
1805                 break;
1806         case CS6:
1807                 config->bits = 6;
1808                 break;
1809         case CS5:
1810                 config->bits = 5;
1811                 break;
1812         default:
1813                 config->bits = -1;
1814         }
1815
1816         if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
1817                 config->parity = SP_PARITY_NONE;
1818         else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
1819                 config->parity = -1;
1820 #ifdef CMSPAR
1821         else if (data->term.c_cflag & CMSPAR)
1822                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_MARK : SP_PARITY_SPACE;
1823 #endif
1824         else
1825                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
1826
1827         config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
1828
1829         if (data->term.c_cflag & CRTSCTS) {
1830                 config->rts = SP_RTS_FLOW_CONTROL;
1831                 config->cts = SP_CTS_FLOW_CONTROL;
1832         } else {
1833                 if (data->termiox_supported && data->rts_flow)
1834                         config->rts = SP_RTS_FLOW_CONTROL;
1835                 else
1836                         config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
1837
1838                 config->cts = (data->termiox_supported && data->cts_flow) ?
1839                         SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1840         }
1841
1842         if (data->termiox_supported && data->dtr_flow)
1843                 config->dtr = SP_DTR_FLOW_CONTROL;
1844         else
1845                 config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
1846
1847         config->dsr = (data->termiox_supported && data->dsr_flow) ?
1848                 SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1849
1850         if (data->term.c_iflag & IXOFF) {
1851                 if (data->term.c_iflag & IXON)
1852                         config->xon_xoff = SP_XONXOFF_INOUT;
1853                 else
1854                         config->xon_xoff = SP_XONXOFF_IN;
1855         } else {
1856                 if (data->term.c_iflag & IXON)
1857                         config->xon_xoff = SP_XONXOFF_OUT;
1858                 else
1859                         config->xon_xoff = SP_XONXOFF_DISABLED;
1860         }
1861 #endif
1862
1863         RETURN_OK();
1864 }
1865
1866 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
1867         const struct sp_port_config *config)
1868 {
1869         unsigned int i;
1870 #ifdef __APPLE__
1871         BAUD_TYPE baud_nonstd;
1872
1873         baud_nonstd = B0;
1874 #endif
1875 #ifdef USE_TERMIOS_SPEED
1876         int baud_nonstd = 0;
1877 #endif
1878
1879         TRACE("%p, %p, %p", port, data, config);
1880
1881         DEBUG_FMT("Setting configuration for port %s", port->name);
1882
1883 #ifdef _WIN32
1884         if (config->baudrate >= 0) {
1885                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1886                         if (config->baudrate == std_baudrates[i].value) {
1887                                 data->dcb.BaudRate = std_baudrates[i].index;
1888                                 break;
1889                         }
1890                 }
1891
1892                 if (i == NUM_STD_BAUDRATES)
1893                         data->dcb.BaudRate = config->baudrate;
1894         }
1895
1896         if (config->bits >= 0)
1897                 data->dcb.ByteSize = config->bits;
1898
1899         if (config->parity >= 0) {
1900                 switch (config->parity) {
1901                 case SP_PARITY_NONE:
1902                         data->dcb.Parity = NOPARITY;
1903                         break;
1904                 case SP_PARITY_ODD:
1905                         data->dcb.Parity = ODDPARITY;
1906                         break;
1907                 case SP_PARITY_EVEN:
1908                         data->dcb.Parity = EVENPARITY;
1909                         break;
1910                 case SP_PARITY_MARK:
1911                         data->dcb.Parity = MARKPARITY;
1912                         break;
1913                 case SP_PARITY_SPACE:
1914                         data->dcb.Parity = SPACEPARITY;
1915                         break;
1916                 default:
1917                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1918                 }
1919         }
1920
1921         if (config->stopbits >= 0) {
1922                 switch (config->stopbits) {
1923                 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
1924                 case 1:
1925                         data->dcb.StopBits = ONESTOPBIT;
1926                         break;
1927                 case 2:
1928                         data->dcb.StopBits = TWOSTOPBITS;
1929                         break;
1930                 default:
1931                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bit setting");
1932                 }
1933         }
1934
1935         if (config->rts >= 0) {
1936                 switch (config->rts) {
1937                 case SP_RTS_OFF:
1938                         data->dcb.fRtsControl = RTS_CONTROL_DISABLE;
1939                         break;
1940                 case SP_RTS_ON:
1941                         data->dcb.fRtsControl = RTS_CONTROL_ENABLE;
1942                         break;
1943                 case SP_RTS_FLOW_CONTROL:
1944                         data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
1945                         break;
1946                 default:
1947                         RETURN_ERROR(SP_ERR_ARG, "Invalid RTS setting");
1948                 }
1949         }
1950
1951         if (config->cts >= 0) {
1952                 switch (config->cts) {
1953                 case SP_CTS_IGNORE:
1954                         data->dcb.fOutxCtsFlow = FALSE;
1955                         break;
1956                 case SP_CTS_FLOW_CONTROL:
1957                         data->dcb.fOutxCtsFlow = TRUE;
1958                         break;
1959                 default:
1960                         RETURN_ERROR(SP_ERR_ARG, "Invalid CTS setting");
1961                 }
1962         }
1963
1964         if (config->dtr >= 0) {
1965                 switch (config->dtr) {
1966                 case SP_DTR_OFF:
1967                         data->dcb.fDtrControl = DTR_CONTROL_DISABLE;
1968                         break;
1969                 case SP_DTR_ON:
1970                         data->dcb.fDtrControl = DTR_CONTROL_ENABLE;
1971                         break;
1972                 case SP_DTR_FLOW_CONTROL:
1973                         data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
1974                         break;
1975                 default:
1976                         RETURN_ERROR(SP_ERR_ARG, "Invalid DTR setting");
1977                 }
1978         }
1979
1980         if (config->dsr >= 0) {
1981                 switch (config->dsr) {
1982                 case SP_DSR_IGNORE:
1983                         data->dcb.fOutxDsrFlow = FALSE;
1984                         break;
1985                 case SP_DSR_FLOW_CONTROL:
1986                         data->dcb.fOutxDsrFlow = TRUE;
1987                         break;
1988                 default:
1989                         RETURN_ERROR(SP_ERR_ARG, "Invalid DSR setting");
1990                 }
1991         }
1992
1993         if (config->xon_xoff >= 0) {
1994                 switch (config->xon_xoff) {
1995                 case SP_XONXOFF_DISABLED:
1996                         data->dcb.fInX = FALSE;
1997                         data->dcb.fOutX = FALSE;
1998                         break;
1999                 case SP_XONXOFF_IN:
2000                         data->dcb.fInX = TRUE;
2001                         data->dcb.fOutX = FALSE;
2002                         break;
2003                 case SP_XONXOFF_OUT:
2004                         data->dcb.fInX = FALSE;
2005                         data->dcb.fOutX = TRUE;
2006                         break;
2007                 case SP_XONXOFF_INOUT:
2008                         data->dcb.fInX = TRUE;
2009                         data->dcb.fOutX = TRUE;
2010                         break;
2011                 default:
2012                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
2013                 }
2014         }
2015
2016         if (!SetCommState(port->hdl, &data->dcb))
2017                 RETURN_FAIL("SetCommState() failed");
2018
2019 #else /* !_WIN32 */
2020
2021         int controlbits;
2022
2023         if (config->baudrate >= 0) {
2024                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
2025                         if (config->baudrate == std_baudrates[i].value) {
2026                                 if (cfsetospeed(&data->term, std_baudrates[i].index) < 0)
2027                                         RETURN_FAIL("cfsetospeed() failed");
2028
2029                                 if (cfsetispeed(&data->term, std_baudrates[i].index) < 0)
2030                                         RETURN_FAIL("cfsetispeed() failed");
2031                                 break;
2032                         }
2033                 }
2034
2035                 /* Non-standard baud rate */
2036                 if (i == NUM_STD_BAUDRATES) {
2037 #ifdef __APPLE__
2038                         /* Set "dummy" baud rate. */
2039                         if (cfsetspeed(&data->term, B9600) < 0)
2040                                 RETURN_FAIL("cfsetspeed() failed");
2041                         baud_nonstd = config->baudrate;
2042 #elif defined(USE_TERMIOS_SPEED)
2043                         baud_nonstd = 1;
2044 #else
2045                         RETURN_ERROR(SP_ERR_SUPP, "Non-standard baudrate not supported");
2046 #endif
2047                 }
2048         }
2049
2050         if (config->bits >= 0) {
2051                 data->term.c_cflag &= ~CSIZE;
2052                 switch (config->bits) {
2053                 case 8:
2054                         data->term.c_cflag |= CS8;
2055                         break;
2056                 case 7:
2057                         data->term.c_cflag |= CS7;
2058                         break;
2059                 case 6:
2060                         data->term.c_cflag |= CS6;
2061                         break;
2062                 case 5:
2063                         data->term.c_cflag |= CS5;
2064                         break;
2065                 default:
2066                         RETURN_ERROR(SP_ERR_ARG, "Invalid data bits setting");
2067                 }
2068         }
2069
2070         if (config->parity >= 0) {
2071                 data->term.c_iflag &= ~IGNPAR;
2072                 data->term.c_cflag &= ~(PARENB | PARODD);
2073 #ifdef CMSPAR
2074                 data->term.c_cflag &= ~CMSPAR;
2075 #endif
2076                 switch (config->parity) {
2077                 case SP_PARITY_NONE:
2078                         data->term.c_iflag |= IGNPAR;
2079                         break;
2080                 case SP_PARITY_EVEN:
2081                         data->term.c_cflag |= PARENB;
2082                         break;
2083                 case SP_PARITY_ODD:
2084                         data->term.c_cflag |= PARENB | PARODD;
2085                         break;
2086 #ifdef CMSPAR
2087                 case SP_PARITY_MARK:
2088                         data->term.c_cflag |= PARENB | PARODD;
2089                         data->term.c_cflag |= CMSPAR;
2090                         break;
2091                 case SP_PARITY_SPACE:
2092                         data->term.c_cflag |= PARENB;
2093                         data->term.c_cflag |= CMSPAR;
2094                         break;
2095 #else
2096                 case SP_PARITY_MARK:
2097                 case SP_PARITY_SPACE:
2098                         RETURN_ERROR(SP_ERR_SUPP, "Mark/space parity not supported");
2099 #endif
2100                 default:
2101                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
2102                 }
2103         }
2104
2105         if (config->stopbits >= 0) {
2106                 data->term.c_cflag &= ~CSTOPB;
2107                 switch (config->stopbits) {
2108                 case 1:
2109                         data->term.c_cflag &= ~CSTOPB;
2110                         break;
2111                 case 2:
2112                         data->term.c_cflag |= CSTOPB;
2113                         break;
2114                 default:
2115                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bits setting");
2116                 }
2117         }
2118
2119         if (config->rts >= 0 || config->cts >= 0) {
2120                 if (data->termiox_supported) {
2121                         data->rts_flow = data->cts_flow = 0;
2122                         switch (config->rts) {
2123                         case SP_RTS_OFF:
2124                         case SP_RTS_ON:
2125                                 controlbits = TIOCM_RTS;
2126                                 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
2127                                         RETURN_FAIL("Setting RTS signal level failed");
2128                                 break;
2129                         case SP_RTS_FLOW_CONTROL:
2130                                 data->rts_flow = 1;
2131                                 break;
2132                         default:
2133                                 break;
2134                         }
2135                         if (config->cts == SP_CTS_FLOW_CONTROL)
2136                                 data->cts_flow = 1;
2137
2138                         if (data->rts_flow && data->cts_flow)
2139                                 data->term.c_iflag |= CRTSCTS;
2140                         else
2141                                 data->term.c_iflag &= ~CRTSCTS;
2142                 } else {
2143                         /* Asymmetric use of RTS/CTS not supported. */
2144                         if (data->term.c_iflag & CRTSCTS) {
2145                                 /* Flow control can only be disabled for both RTS & CTS together. */
2146                                 if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
2147                                         if (config->cts != SP_CTS_IGNORE)
2148                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
2149                                 }
2150                                 if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
2151                                         if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
2152                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
2153                                 }
2154                         } else {
2155                                 /* Flow control can only be enabled for both RTS & CTS together. */
2156                                 if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
2157                                         ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
2158                                         RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be enabled together");
2159                         }
2160
2161                         if (config->rts >= 0) {
2162                                 if (config->rts == SP_RTS_FLOW_CONTROL) {
2163                                         data->term.c_iflag |= CRTSCTS;
2164                                 } else {
2165                                         controlbits = TIOCM_RTS;
2166                                         if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
2167                                                         &controlbits) < 0)
2168                                                 RETURN_FAIL("Setting RTS signal level failed");
2169                                 }
2170                         }
2171                 }
2172         }
2173
2174         if (config->dtr >= 0 || config->dsr >= 0) {
2175                 if (data->termiox_supported) {
2176                         data->dtr_flow = data->dsr_flow = 0;
2177                         switch (config->dtr) {
2178                         case SP_DTR_OFF:
2179                         case SP_DTR_ON:
2180                                 controlbits = TIOCM_DTR;
2181                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
2182                                         RETURN_FAIL("Setting DTR signal level failed");
2183                                 break;
2184                         case SP_DTR_FLOW_CONTROL:
2185                                 data->dtr_flow = 1;
2186                                 break;
2187                         default:
2188                                 break;
2189                         }
2190                         if (config->dsr == SP_DSR_FLOW_CONTROL)
2191                                 data->dsr_flow = 1;
2192                 } else {
2193                         /* DTR/DSR flow control not supported. */
2194                         if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
2195                                 RETURN_ERROR(SP_ERR_SUPP, "DTR/DSR flow control not supported");
2196
2197                         if (config->dtr >= 0) {
2198                                 controlbits = TIOCM_DTR;
2199                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
2200                                                 &controlbits) < 0)
2201                                         RETURN_FAIL("Setting DTR signal level failed");
2202                         }
2203                 }
2204         }
2205
2206         if (config->xon_xoff >= 0) {
2207                 data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
2208                 switch (config->xon_xoff) {
2209                 case SP_XONXOFF_DISABLED:
2210                         break;
2211                 case SP_XONXOFF_IN:
2212                         data->term.c_iflag |= IXOFF;
2213                         break;
2214                 case SP_XONXOFF_OUT:
2215                         data->term.c_iflag |= IXON | IXANY;
2216                         break;
2217                 case SP_XONXOFF_INOUT:
2218                         data->term.c_iflag |= IXON | IXOFF | IXANY;
2219                         break;
2220                 default:
2221                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
2222                 }
2223         }
2224
2225         if (tcsetattr(port->fd, TCSANOW, &data->term) < 0)
2226                 RETURN_FAIL("tcsetattr() failed");
2227
2228 #ifdef __APPLE__
2229         if (baud_nonstd != B0) {
2230                 if (ioctl(port->fd, IOSSIOSPEED, &baud_nonstd) == -1)
2231                         RETURN_FAIL("IOSSIOSPEED ioctl failed");
2232                 /*
2233                  * Set baud rates in data->term to correct, but incompatible
2234                  * with tcsetattr() value, same as delivered by tcgetattr().
2235                  */
2236                 if (cfsetspeed(&data->term, baud_nonstd) < 0)
2237                         RETURN_FAIL("cfsetspeed() failed");
2238         }
2239 #elif defined(__linux__)
2240 #ifdef USE_TERMIOS_SPEED
2241         if (baud_nonstd)
2242                 TRY(set_baudrate(port->fd, config->baudrate));
2243 #endif
2244 #ifdef USE_TERMIOX
2245         if (data->termiox_supported)
2246                 TRY(set_flow(port->fd, data));
2247 #endif
2248 #endif
2249
2250 #endif /* !_WIN32 */
2251
2252         RETURN_OK();
2253 }
2254
2255 SP_API enum sp_return sp_new_config(struct sp_port_config **config_ptr)
2256 {
2257         struct sp_port_config *config;
2258
2259         TRACE("%p", config_ptr);
2260
2261         if (!config_ptr)
2262                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2263
2264         *config_ptr = NULL;
2265
2266         if (!(config = malloc(sizeof(struct sp_port_config))))
2267                 RETURN_ERROR(SP_ERR_MEM, "Config malloc failed");
2268
2269         config->baudrate = -1;
2270         config->bits = -1;
2271         config->parity = -1;
2272         config->stopbits = -1;
2273         config->rts = -1;
2274         config->cts = -1;
2275         config->dtr = -1;
2276         config->dsr = -1;
2277
2278         *config_ptr = config;
2279
2280         RETURN_OK();
2281 }
2282
2283 SP_API void sp_free_config(struct sp_port_config *config)
2284 {
2285         TRACE("%p", config);
2286
2287         if (!config)
2288                 DEBUG("Null config");
2289         else
2290                 free(config);
2291
2292         RETURN();
2293 }
2294
2295 SP_API enum sp_return sp_get_config(struct sp_port *port,
2296                                     struct sp_port_config *config)
2297 {
2298         struct port_data data;
2299
2300         TRACE("%p, %p", port, config);
2301
2302         CHECK_OPEN_PORT();
2303
2304         if (!config)
2305                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2306
2307         TRY(get_config(port, &data, config));
2308
2309         RETURN_OK();
2310 }
2311
2312 SP_API enum sp_return sp_set_config(struct sp_port *port,
2313                                     const struct sp_port_config *config)
2314 {
2315         struct port_data data;
2316         struct sp_port_config prev_config;
2317
2318         TRACE("%p, %p", port, config);
2319
2320         CHECK_OPEN_PORT();
2321
2322         if (!config)
2323                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2324
2325         TRY(get_config(port, &data, &prev_config));
2326         TRY(set_config(port, &data, config));
2327
2328         RETURN_OK();
2329 }
2330
2331 #define CREATE_ACCESSORS(x, type) \
2332 SP_API enum sp_return sp_set_##x(struct sp_port *port, type x) { \
2333         struct port_data data; \
2334         struct sp_port_config config; \
2335         TRACE("%p, %d", port, x); \
2336         CHECK_OPEN_PORT(); \
2337         TRY(get_config(port, &data, &config)); \
2338         config.x = x; \
2339         TRY(set_config(port, &data, &config)); \
2340         RETURN_OK(); \
2341 } \
2342 SP_API enum sp_return sp_get_config_##x(const struct sp_port_config *config, \
2343                                         type *x) { \
2344         TRACE("%p, %p", config, x); \
2345         if (!x) \
2346                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer"); \
2347         if (!config) \
2348                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2349         *x = config->x; \
2350         RETURN_OK(); \
2351 } \
2352 SP_API enum sp_return sp_set_config_##x(struct sp_port_config *config, \
2353                                         type x) { \
2354         TRACE("%p, %d", config, x); \
2355         if (!config) \
2356                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2357         config->x = x; \
2358         RETURN_OK(); \
2359 }
2360
2361 CREATE_ACCESSORS(baudrate, int)
2362 CREATE_ACCESSORS(bits, int)
2363 CREATE_ACCESSORS(parity, enum sp_parity)
2364 CREATE_ACCESSORS(stopbits, int)
2365 CREATE_ACCESSORS(rts, enum sp_rts)
2366 CREATE_ACCESSORS(cts, enum sp_cts)
2367 CREATE_ACCESSORS(dtr, enum sp_dtr)
2368 CREATE_ACCESSORS(dsr, enum sp_dsr)
2369 CREATE_ACCESSORS(xon_xoff, enum sp_xonxoff)
2370
2371 SP_API enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config,
2372                                                 enum sp_flowcontrol flowcontrol)
2373 {
2374         if (!config)
2375                 RETURN_ERROR(SP_ERR_ARG, "Null configuration");
2376
2377         if (flowcontrol > SP_FLOWCONTROL_DTRDSR)
2378                 RETURN_ERROR(SP_ERR_ARG, "Invalid flow control setting");
2379
2380         if (flowcontrol == SP_FLOWCONTROL_XONXOFF)
2381                 config->xon_xoff = SP_XONXOFF_INOUT;
2382         else
2383                 config->xon_xoff = SP_XONXOFF_DISABLED;
2384
2385         if (flowcontrol == SP_FLOWCONTROL_RTSCTS) {
2386                 config->rts = SP_RTS_FLOW_CONTROL;
2387                 config->cts = SP_CTS_FLOW_CONTROL;
2388         } else {
2389                 if (config->rts == SP_RTS_FLOW_CONTROL)
2390                         config->rts = SP_RTS_ON;
2391                 config->cts = SP_CTS_IGNORE;
2392         }
2393
2394         if (flowcontrol == SP_FLOWCONTROL_DTRDSR) {
2395                 config->dtr = SP_DTR_FLOW_CONTROL;
2396                 config->dsr = SP_DSR_FLOW_CONTROL;
2397         } else {
2398                 if (config->dtr == SP_DTR_FLOW_CONTROL)
2399                         config->dtr = SP_DTR_ON;
2400                 config->dsr = SP_DSR_IGNORE;
2401         }
2402
2403         RETURN_OK();
2404 }
2405
2406 SP_API enum sp_return sp_set_flowcontrol(struct sp_port *port,
2407                                          enum sp_flowcontrol flowcontrol)
2408 {
2409         struct port_data data;
2410         struct sp_port_config config;
2411
2412         TRACE("%p, %d", port, flowcontrol);
2413
2414         CHECK_OPEN_PORT();
2415
2416         TRY(get_config(port, &data, &config));
2417
2418         TRY(sp_set_config_flowcontrol(&config, flowcontrol));
2419
2420         TRY(set_config(port, &data, &config));
2421
2422         RETURN_OK();
2423 }
2424
2425 SP_API enum sp_return sp_get_signals(struct sp_port *port,
2426                                      enum sp_signal *signals)
2427 {
2428         TRACE("%p, %p", port, signals);
2429
2430         CHECK_OPEN_PORT();
2431
2432         if (!signals)
2433                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2434
2435         DEBUG_FMT("Getting control signals for port %s", port->name);
2436
2437         *signals = 0;
2438 #ifdef _WIN32
2439         DWORD bits;
2440         if (GetCommModemStatus(port->hdl, &bits) == 0)
2441                 RETURN_FAIL("GetCommModemStatus() failed");
2442         if (bits & MS_CTS_ON)
2443                 *signals |= SP_SIG_CTS;
2444         if (bits & MS_DSR_ON)
2445                 *signals |= SP_SIG_DSR;
2446         if (bits & MS_RLSD_ON)
2447                 *signals |= SP_SIG_DCD;
2448         if (bits & MS_RING_ON)
2449                 *signals |= SP_SIG_RI;
2450 #else
2451         int bits;
2452         if (ioctl(port->fd, TIOCMGET, &bits) < 0)
2453                 RETURN_FAIL("TIOCMGET ioctl failed");
2454         if (bits & TIOCM_CTS)
2455                 *signals |= SP_SIG_CTS;
2456         if (bits & TIOCM_DSR)
2457                 *signals |= SP_SIG_DSR;
2458         if (bits & TIOCM_CAR)
2459                 *signals |= SP_SIG_DCD;
2460         if (bits & TIOCM_RNG)
2461                 *signals |= SP_SIG_RI;
2462 #endif
2463         RETURN_OK();
2464 }
2465
2466 SP_API enum sp_return sp_start_break(struct sp_port *port)
2467 {
2468         TRACE("%p", port);
2469
2470         CHECK_OPEN_PORT();
2471 #ifdef _WIN32
2472         if (SetCommBreak(port->hdl) == 0)
2473                 RETURN_FAIL("SetCommBreak() failed");
2474 #else
2475         if (ioctl(port->fd, TIOCSBRK, 1) < 0)
2476                 RETURN_FAIL("TIOCSBRK ioctl failed");
2477 #endif
2478
2479         RETURN_OK();
2480 }
2481
2482 SP_API enum sp_return sp_end_break(struct sp_port *port)
2483 {
2484         TRACE("%p", port);
2485
2486         CHECK_OPEN_PORT();
2487 #ifdef _WIN32
2488         if (ClearCommBreak(port->hdl) == 0)
2489                 RETURN_FAIL("ClearCommBreak() failed");
2490 #else
2491         if (ioctl(port->fd, TIOCCBRK, 1) < 0)
2492                 RETURN_FAIL("TIOCCBRK ioctl failed");
2493 #endif
2494
2495         RETURN_OK();
2496 }
2497
2498 SP_API int sp_last_error_code(void)
2499 {
2500         TRACE_VOID();
2501 #ifdef _WIN32
2502         RETURN_INT(GetLastError());
2503 #else
2504         RETURN_INT(errno);
2505 #endif
2506 }
2507
2508 SP_API char *sp_last_error_message(void)
2509 {
2510         TRACE_VOID();
2511
2512 #ifdef _WIN32
2513         TCHAR *message;
2514         DWORD error = GetLastError();
2515
2516         DWORD length = FormatMessage(
2517                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
2518                 FORMAT_MESSAGE_FROM_SYSTEM |
2519                 FORMAT_MESSAGE_IGNORE_INSERTS,
2520                 NULL,
2521                 error,
2522                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
2523                 (LPTSTR) &message,
2524                 0, NULL );
2525
2526         if (length >= 2 && message[length - 2] == '\r')
2527                 message[length - 2] = '\0';
2528
2529         RETURN_STRING(message);
2530 #else
2531         RETURN_STRING(strerror(errno));
2532 #endif
2533 }
2534
2535 SP_API void sp_free_error_message(char *message)
2536 {
2537         TRACE("%s", message);
2538
2539 #ifdef _WIN32
2540         LocalFree(message);
2541 #else
2542         (void)message;
2543 #endif
2544
2545         RETURN();
2546 }
2547
2548 SP_API void sp_set_debug_handler(void (*handler)(const char *format, ...))
2549 {
2550         TRACE("%p", handler);
2551
2552         sp_debug_handler = handler;
2553
2554         RETURN();
2555 }
2556
2557 SP_API void sp_default_debug_handler(const char *format, ...)
2558 {
2559         va_list args;
2560         va_start(args, format);
2561         if (getenv("LIBSERIALPORT_DEBUG")) {
2562                 fputs("sp: ", stderr);
2563                 vfprintf(stderr, format, args);
2564         }
2565         va_end(args);
2566 }
2567
2568 SP_API int sp_get_major_package_version(void)
2569 {
2570         return SP_PACKAGE_VERSION_MAJOR;
2571 }
2572
2573 SP_API int sp_get_minor_package_version(void)
2574 {
2575         return SP_PACKAGE_VERSION_MINOR;
2576 }
2577
2578 SP_API int sp_get_micro_package_version(void)
2579 {
2580         return SP_PACKAGE_VERSION_MICRO;
2581 }
2582
2583 SP_API const char *sp_get_package_version_string(void)
2584 {
2585         return SP_PACKAGE_VERSION_STRING;
2586 }
2587
2588 SP_API int sp_get_current_lib_version(void)
2589 {
2590         return SP_LIB_VERSION_CURRENT;
2591 }
2592
2593 SP_API int sp_get_revision_lib_version(void)
2594 {
2595         return SP_LIB_VERSION_REVISION;
2596 }
2597
2598 SP_API int sp_get_age_lib_version(void)
2599 {
2600         return SP_LIB_VERSION_AGE;
2601 }
2602
2603 SP_API const char *sp_get_lib_version_string(void)
2604 {
2605         return SP_LIB_VERSION_STRING;
2606 }
2607
2608 /** @} */