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 (!(port = malloc(sizeof(struct sp_port))))
  79                 RETURN_ERROR(SP_ERR_MEM, "Port structure malloc failed");
  80
  81         len = strlen(portname) + 1;
  82
  83         if (!(port->name = malloc(len))) {
  84                 free(port);
  85                 RETURN_ERROR(SP_ERR_MEM, "Port name malloc failed");
  86         }
  87
  88         memcpy(port->name, portname, len);
  89
  90 #ifdef _WIN32
  91         port->usb_path = NULL;
  92         port->hdl = INVALID_HANDLE_VALUE;
  93 #else
  94         port->fd = -1;
  95 #endif
  96
  97         port->description = NULL;
  98         port->transport = SP_TRANSPORT_NATIVE;
  99         port->usb_bus = -1;
 100         port->usb_address = -1;
 101         port->usb_vid = -1;
 102         port->usb_pid = -1;
 103         port->usb_manufacturer = NULL;
 104         port->usb_product = NULL;
 105         port->usb_serial = NULL;
 106         port->bluetooth_address = NULL;
 107
 108 #ifndef NO_PORT_METADATA
 109         if ((ret = get_port_details(port)) != SP_OK) {
 110                 sp_free_port(port);
 111                 return ret;
 112         }
 113 #endif
 114
 115         *port_ptr = port;
 116
 117         RETURN_OK();
 118 }
 119
 120 SP_API char *sp_get_port_name(const struct sp_port *port)
 121 {
 122         TRACE("%p", port);
 123
 124         if (!port)
 125                 return NULL;
 126
 127         RETURN_STRING(port->name);
 128 }
 129
 130 SP_API char *sp_get_port_description(const struct sp_port *port)
 131 {
 132         TRACE("%p", port);
 133
 134         if (!port || !port->description)
 135                 return NULL;
 136
 137         RETURN_STRING(port->description);
 138 }
 139
 140 SP_API enum sp_transport sp_get_port_transport(const struct sp_port *port)
 141 {
 142         TRACE("%p", port);
 143
 144         if (!port)
 145                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 146
 147         RETURN_INT(port->transport);
 148 }
 149
 150 SP_API enum sp_return sp_get_port_usb_bus_address(const struct sp_port *port,
 151                                                   int *usb_bus,int *usb_address)
 152 {
 153         TRACE("%p", port);
 154
 155         if (!port)
 156                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 157         if (port->transport != SP_TRANSPORT_USB)
 158                 RETURN_ERROR(SP_ERR_ARG, "Port does not use USB transport");
 159         if (port->usb_bus < 0 || port->usb_address < 0)
 160                 RETURN_ERROR(SP_ERR_SUPP, "Bus and address values are not available");
 161
 162         if (usb_bus)
 163                 *usb_bus = port->usb_bus;
 164         if (usb_address)
 165                 *usb_address = port->usb_address;
 166
 167         RETURN_OK();
 168 }
 169
 170 SP_API enum sp_return sp_get_port_usb_vid_pid(const struct sp_port *port,
 171                                               int *usb_vid, int *usb_pid)
 172 {
 173         TRACE("%p", port);
 174
 175         if (!port)
 176                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 177         if (port->transport != SP_TRANSPORT_USB)
 178                 RETURN_ERROR(SP_ERR_ARG, "Port does not use USB transport");
 179         if (port->usb_vid < 0 || port->usb_pid < 0)
 180                 RETURN_ERROR(SP_ERR_SUPP, "VID:PID values are not available");
 181
 182         if (usb_vid)
 183                 *usb_vid = port->usb_vid;
 184         if (usb_pid)
 185                 *usb_pid = port->usb_pid;
 186
 187         RETURN_OK();
 188 }
 189
 190 SP_API char *sp_get_port_usb_manufacturer(const struct sp_port *port)
 191 {
 192         TRACE("%p", port);
 193
 194         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_manufacturer)
 195                 return NULL;
 196
 197         RETURN_STRING(port->usb_manufacturer);
 198 }
 199
 200 SP_API char *sp_get_port_usb_product(const struct sp_port *port)
 201 {
 202         TRACE("%p", port);
 203
 204         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_product)
 205                 return NULL;
 206
 207         RETURN_STRING(port->usb_product);
 208 }
 209
 210 SP_API char *sp_get_port_usb_serial(const struct sp_port *port)
 211 {
 212         TRACE("%p", port);
 213
 214         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_serial)
 215                 return NULL;
 216
 217         RETURN_STRING(port->usb_serial);
 218 }
 219
 220 SP_API char *sp_get_port_bluetooth_address(const struct sp_port *port)
 221 {
 222         TRACE("%p", port);
 223
 224         if (!port || port->transport != SP_TRANSPORT_BLUETOOTH
 225             || !port->bluetooth_address)
 226                 return NULL;
 227
 228         RETURN_STRING(port->bluetooth_address);
 229 }
 230
 231 SP_API enum sp_return sp_get_port_handle(const struct sp_port *port,
 232                                          void *result_ptr)
 233 {
 234         TRACE("%p, %p", port, result_ptr);
 235
 236         if (!port)
 237                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 238         if (!result_ptr)
 239                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 240
 241 #ifdef _WIN32
 242         HANDLE *handle_ptr = result_ptr;
 243         *handle_ptr = port->hdl;
 244 #else
 245         int *fd_ptr = result_ptr;
 246         *fd_ptr = port->fd;
 247 #endif
 248
 249         RETURN_OK();
 250 }
 251
 252 SP_API enum sp_return sp_copy_port(const struct sp_port *port,
 253                                    struct sp_port **copy_ptr)
 254 {
 255         TRACE("%p, %p", port, copy_ptr);
 256
 257         if (!copy_ptr)
 258                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 259
 260         *copy_ptr = NULL;
 261
 262         if (!port)
 263                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 264
 265         if (!port->name)
 266                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
 267
 268         DEBUG("Copying port structure");
 269
 270         RETURN_INT(sp_get_port_by_name(port->name, copy_ptr));
 271 }
 272
 273 SP_API void sp_free_port(struct sp_port *port)
 274 {
 275         TRACE("%p", port);
 276
 277         if (!port) {
 278                 DEBUG("Null port");
 279                 RETURN();
 280         }
 281
 282         DEBUG("Freeing port structure");
 283
 284         if (port->name)
 285                 free(port->name);
 286         if (port->description)
 287                 free(port->description);
 288         if (port->usb_manufacturer)
 289                 free(port->usb_manufacturer);
 290         if (port->usb_product)
 291                 free(port->usb_product);
 292         if (port->usb_serial)
 293                 free(port->usb_serial);
 294         if (port->bluetooth_address)
 295                 free(port->bluetooth_address);
 296 #ifdef _WIN32
 297         if (port->usb_path)
 298                 free(port->usb_path);
 299 #endif
 300
 301         free(port);
 302
 303         RETURN();
 304 }
 305
 306 SP_PRIV struct sp_port **list_append(struct sp_port **list,
 307                                      const char *portname)
 308 {
 309         void *tmp;
 310         unsigned int count;
 311
 312         for (count = 0; list[count]; count++);
 313         if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2))))
 314                 goto fail;
 315         list = tmp;
 316         if (sp_get_port_by_name(portname, &list[count]) != SP_OK)
 317                 goto fail;
 318         list[count + 1] = NULL;
 319         return list;
 320
 321 fail:
 322         sp_free_port_list(list);
 323         return NULL;
 324 }
 325
 326 SP_API enum sp_return sp_list_ports(struct sp_port ***list_ptr)
 327 {
 328 #ifndef NO_ENUMERATION
 329         struct sp_port **list;
 330         int ret;
 331 #endif
 332
 333         TRACE("%p", list_ptr);
 334
 335         if (!list_ptr)
 336                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 337
 338         *list_ptr = NULL;
 339
 340 #ifdef NO_ENUMERATION
 341         RETURN_ERROR(SP_ERR_SUPP, "Enumeration not supported on this platform");
 342 #else
 343         DEBUG("Enumerating ports");
 344
 345         if (!(list = malloc(sizeof(struct sp_port *))))
 346                 RETURN_ERROR(SP_ERR_MEM, "Port list malloc failed");
 347
 348         list[0] = NULL;
 349
 350         ret = list_ports(&list);
 351
 352         if (ret == SP_OK) {
 353                 *list_ptr = list;
 354         } else {
 355                 sp_free_port_list(list);
 356                 *list_ptr = NULL;
 357         }
 358
 359         RETURN_CODEVAL(ret);
 360 #endif
 361 }
 362
 363 SP_API void sp_free_port_list(struct sp_port **list)
 364 {
 365         unsigned int i;
 366
 367         TRACE("%p", list);
 368
 369         if (!list) {
 370                 DEBUG("Null list");
 371                 RETURN();
 372         }
 373
 374         DEBUG("Freeing port list");
 375
 376         for (i = 0; list[i]; i++)
 377                 sp_free_port(list[i]);
 378         free(list);
 379
 380         RETURN();
 381 }
 382
 383 #define CHECK_PORT() do { \
 384         if (!port) \
 385                 RETURN_ERROR(SP_ERR_ARG, "Null port"); \
 386         if (!port->name) \
 387                 RETURN_ERROR(SP_ERR_ARG, "Null port name"); \
 388 } while (0)
 389 #ifdef _WIN32
 390 #define CHECK_PORT_HANDLE() do { \
 391         if (port->hdl == INVALID_HANDLE_VALUE) \
 392                 RETURN_ERROR(SP_ERR_ARG, "Invalid port handle"); \
 393 } while (0)
 394 #else
 395 #define CHECK_PORT_HANDLE() do { \
 396         if (port->fd < 0) \
 397                 RETURN_ERROR(SP_ERR_ARG, "Invalid port fd"); \
 398 } while (0)
 399 #endif
 400 #define CHECK_OPEN_PORT() do { \
 401         CHECK_PORT(); \
 402         CHECK_PORT_HANDLE(); \
 403 } while (0)
 404
 405 #ifdef WIN32
 406 /** To be called after port receive buffer is emptied. */
 407 static enum sp_return restart_wait(struct sp_port *port)
 408 {
 409         DWORD wait_result;
 410
 411         if (port->wait_running) {
 412                 /* Check status of running wait operation. */
 413                 if (GetOverlappedResult(port->hdl, &port->wait_ovl,
 414                                 &wait_result, FALSE)) {
 415                         DEBUG("Previous wait completed");
 416                         port->wait_running = FALSE;
 417                 } else if (GetLastError() == ERROR_IO_INCOMPLETE) {
 418                         DEBUG("Previous wait still running");
 419                         RETURN_OK();
 420                 } else {
 421                         RETURN_FAIL("GetOverlappedResult() failed");
 422                 }
 423         }
 424
 425         if (!port->wait_running) {
 426                 /* Start new wait operation. */
 427                 if (WaitCommEvent(port->hdl, &port->events,
 428                                 &port->wait_ovl)) {
 429                         DEBUG("New wait returned, events already pending");
 430                 } else if (GetLastError() == ERROR_IO_PENDING) {
 431                         DEBUG("New wait running in background");
 432                         port->wait_running = TRUE;
 433                 } else {
 434                         RETURN_FAIL("WaitCommEvent() failed");
 435                 }
 436         }
 437
 438         RETURN_OK();
 439 }
 440 #endif
 441
 442 SP_API enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
 443 {
 444         struct port_data data;
 445         struct sp_port_config config;
 446         enum sp_return ret;
 447
 448         TRACE("%p, 0x%x", port, flags);
 449
 450         CHECK_PORT();
 451
 452         if (flags > SP_MODE_READ_WRITE)
 453                 RETURN_ERROR(SP_ERR_ARG, "Invalid flags");
 454
 455         DEBUG_FMT("Opening port %s", port->name);
 456
 457 #ifdef _WIN32
 458         DWORD desired_access = 0, flags_and_attributes = 0, errors;
 459         char *escaped_port_name;
 460         COMSTAT status;
 461
 462         /* Prefix port name with '\\.\' to work with ports above COM9. */
 463         if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
 464                 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
 465         sprintf(escaped_port_name, "\\\\.\\%s", port->name);
 466
 467         /* Map 'flags' to the OS-specific settings. */
 468         flags_and_attributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED;
 469         if (flags & SP_MODE_READ)
 470                 desired_access |= GENERIC_READ;
 471         if (flags & SP_MODE_WRITE)
 472                 desired_access |= GENERIC_WRITE;
 473
 474         port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0,
 475                          OPEN_EXISTING, flags_and_attributes, 0);
 476
 477         free(escaped_port_name);
 478
 479         if (port->hdl == INVALID_HANDLE_VALUE)
 480                 RETURN_FAIL("Port CreateFile() failed");
 481
 482         /* All timeouts initially disabled. */
 483         port->timeouts.ReadIntervalTimeout = 0;
 484         port->timeouts.ReadTotalTimeoutMultiplier = 0;
 485         port->timeouts.ReadTotalTimeoutConstant = 0;
 486         port->timeouts.WriteTotalTimeoutMultiplier = 0;
 487         port->timeouts.WriteTotalTimeoutConstant = 0;
 488
 489         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0) {
 490                 sp_close(port);
 491                 RETURN_FAIL("SetCommTimeouts() failed");
 492         }
 493
 494         /* Prepare OVERLAPPED structures. */
 495 #define INIT_OVERLAPPED(ovl) do { \
 496         memset(&port->ovl, 0, sizeof(port->ovl)); \
 497         port->ovl.hEvent = INVALID_HANDLE_VALUE; \
 498         if ((port->ovl.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL)) \
 499                         == INVALID_HANDLE_VALUE) { \
 500                 sp_close(port); \
 501                 RETURN_FAIL(#ovl "CreateEvent() failed"); \
 502         } \
 503 } while (0)
 504
 505         INIT_OVERLAPPED(read_ovl);
 506         INIT_OVERLAPPED(write_ovl);
 507         INIT_OVERLAPPED(wait_ovl);
 508
 509         /* Set event mask for RX and error events. */
 510         if (SetCommMask(port->hdl, EV_RXCHAR | EV_ERR) == 0) {
 511                 sp_close(port);
 512                 RETURN_FAIL("SetCommMask() failed");
 513         }
 514
 515         port->writing = FALSE;
 516         port->wait_running = FALSE;
 517
 518         ret = restart_wait(port);
 519
 520         if (ret < 0) {
 521                 sp_close(port);
 522                 RETURN_CODEVAL(ret);
 523         }
 524 #else
 525         int flags_local = O_NONBLOCK | O_NOCTTY;
 526
 527         /* Map 'flags' to the OS-specific settings. */
 528         if ((flags & SP_MODE_READ_WRITE) == SP_MODE_READ_WRITE)
 529                 flags_local |= O_RDWR;
 530         else if (flags & SP_MODE_READ)
 531                 flags_local |= O_RDONLY;
 532         else if (flags & SP_MODE_WRITE)
 533                 flags_local |= O_WRONLY;
 534
 535         if ((port->fd = open(port->name, flags_local)) < 0)
 536                 RETURN_FAIL("open() failed");
 537 #endif
 538
 539         ret = get_config(port, &data, &config);
 540
 541         if (ret < 0) {
 542                 sp_close(port);
 543                 RETURN_CODEVAL(ret);
 544         }
 545
 546         /* Set sane port settings. */
 547 #ifdef _WIN32
 548         data.dcb.fBinary = TRUE;
 549         data.dcb.fDsrSensitivity = FALSE;
 550         data.dcb.fErrorChar = FALSE;
 551         data.dcb.fNull = FALSE;
 552         data.dcb.fAbortOnError = FALSE;
 553 #else
 554         /* Turn off all fancy termios tricks, give us a raw channel. */
 555         data.term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IMAXBEL);
 556 #ifdef IUCLC
 557         data.term.c_iflag &= ~IUCLC;
 558 #endif
 559         data.term.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);
 560 #ifdef OLCUC
 561         data.term.c_oflag &= ~OLCUC;
 562 #endif
 563 #ifdef NLDLY
 564         data.term.c_oflag &= ~NLDLY;
 565 #endif
 566 #ifdef CRDLY
 567         data.term.c_oflag &= ~CRDLY;
 568 #endif
 569 #ifdef TABDLY
 570         data.term.c_oflag &= ~TABDLY;
 571 #endif
 572 #ifdef BSDLY
 573         data.term.c_oflag &= ~BSDLY;
 574 #endif
 575 #ifdef VTDLY
 576         data.term.c_oflag &= ~VTDLY;
 577 #endif
 578 #ifdef FFDLY
 579         data.term.c_oflag &= ~FFDLY;
 580 #endif
 581 #ifdef OFILL
 582         data.term.c_oflag &= ~OFILL;
 583 #endif
 584         data.term.c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN);
 585         data.term.c_cc[VMIN] = 0;
 586         data.term.c_cc[VTIME] = 0;
 587
 588         /* Ignore modem status lines; enable receiver; leave control lines alone on close. */
 589         data.term.c_cflag |= (CLOCAL | CREAD | HUPCL);
 590 #endif
 591
 592 #ifdef _WIN32
 593         if (ClearCommError(port->hdl, &errors, &status) == 0)
 594                 RETURN_FAIL("ClearCommError() failed");
 595 #endif
 596
 597         ret = set_config(port, &data, &config);
 598
 599         if (ret < 0) {
 600                 sp_close(port);
 601                 RETURN_CODEVAL(ret);
 602         }
 603
 604         RETURN_OK();
 605 }
 606
 607 SP_API enum sp_return sp_close(struct sp_port *port)
 608 {
 609         TRACE("%p", port);
 610
 611         CHECK_OPEN_PORT();
 612
 613         DEBUG_FMT("Closing port %s", port->name);
 614
 615 #ifdef _WIN32
 616         /* Returns non-zero upon success, 0 upon failure. */
 617         if (CloseHandle(port->hdl) == 0)
 618                 RETURN_FAIL("Port CloseHandle() failed");
 619         port->hdl = INVALID_HANDLE_VALUE;
 620
 621         /* Close event handles for overlapped structures. */
 622 #define CLOSE_OVERLAPPED(ovl) do { \
 623         if (port->ovl.hEvent != INVALID_HANDLE_VALUE && \
 624                 CloseHandle(port->ovl.hEvent) == 0) \
 625                 RETURN_FAIL(# ovl "event CloseHandle() failed"); \
 626 } while (0)
 627         CLOSE_OVERLAPPED(read_ovl);
 628         CLOSE_OVERLAPPED(write_ovl);
 629         CLOSE_OVERLAPPED(wait_ovl);
 630
 631 #else
 632         /* Returns 0 upon success, -1 upon failure. */
 633         if (close(port->fd) == -1)
 634                 RETURN_FAIL("close() failed");
 635         port->fd = -1;
 636 #endif
 637
 638         RETURN_OK();
 639 }
 640
 641 SP_API enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers)
 642 {
 643         TRACE("%p, 0x%x", port, buffers);
 644
 645         CHECK_OPEN_PORT();
 646
 647         if (buffers > SP_BUF_BOTH)
 648                 RETURN_ERROR(SP_ERR_ARG, "Invalid buffer selection");
 649
 650         const char *buffer_names[] = {"no", "input", "output", "both"};
 651
 652         DEBUG_FMT("Flushing %s buffers on port %s",
 653                 buffer_names[buffers], port->name);
 654
 655 #ifdef _WIN32
 656         DWORD flags = 0;
 657         if (buffers & SP_BUF_INPUT)
 658                 flags |= PURGE_RXCLEAR;
 659         if (buffers & SP_BUF_OUTPUT)
 660                 flags |= PURGE_TXCLEAR;
 661
 662         /* Returns non-zero upon success, 0 upon failure. */
 663         if (PurgeComm(port->hdl, flags) == 0)
 664                 RETURN_FAIL("PurgeComm() failed");
 665
 666         if (buffers & SP_BUF_INPUT)
 667                 TRY(restart_wait(port));
 668 #else
 669         int flags = 0;
 670         if (buffers == SP_BUF_BOTH)
 671                 flags = TCIOFLUSH;
 672         else if (buffers == SP_BUF_INPUT)
 673                 flags = TCIFLUSH;
 674         else if (buffers == SP_BUF_OUTPUT)
 675                 flags = TCOFLUSH;
 676
 677         /* Returns 0 upon success, -1 upon failure. */
 678         if (tcflush(port->fd, flags) < 0)
 679                 RETURN_FAIL("tcflush() failed");
 680 #endif
 681         RETURN_OK();
 682 }
 683
 684 SP_API enum sp_return sp_drain(struct sp_port *port)
 685 {
 686         TRACE("%p", port);
 687
 688         CHECK_OPEN_PORT();
 689
 690         DEBUG_FMT("Draining port %s", port->name);
 691
 692 #ifdef _WIN32
 693         /* Returns non-zero upon success, 0 upon failure. */
 694         if (FlushFileBuffers(port->hdl) == 0)
 695                 RETURN_FAIL("FlushFileBuffers() failed");
 696         RETURN_OK();
 697 #else
 698         int result;
 699         while (1) {
 700 #ifdef __ANDROID__
 701                 int arg = 1;
 702                 result = ioctl(port->fd, TCSBRK, &arg);
 703 #else
 704                 result = tcdrain(port->fd);
 705 #endif
 706                 if (result < 0) {
 707                         if (errno == EINTR) {
 708                                 DEBUG("tcdrain() was interrupted");
 709                                 continue;
 710                         } else {
 711                                 RETURN_FAIL("tcdrain() failed");
 712                         }
 713                 } else {
 714                         RETURN_OK();
 715                 }
 716         }
 717 #endif
 718 }
 719
 720 SP_API enum sp_return sp_blocking_write(struct sp_port *port, const void *buf,
 721                                         size_t count, unsigned int timeout_ms)
 722 {
 723         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 724
 725         CHECK_OPEN_PORT();
 726
 727         if (!buf)
 728                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 729
 730         if (timeout_ms)
 731                 DEBUG_FMT("Writing %d bytes to port %s, timeout %d ms",
 732                         count, port->name, timeout_ms);
 733         else
 734                 DEBUG_FMT("Writing %d bytes to port %s, no timeout",
 735                         count, port->name);
 736
 737         if (count == 0)
 738                 RETURN_INT(0);
 739
 740 #ifdef _WIN32
 741         DWORD bytes_written = 0;
 742         BOOL result;
 743
 744         /* Wait for previous non-blocking write to complete, if any. */
 745         if (port->writing) {
 746                 DEBUG("Waiting for previous write to complete");
 747                 result = GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
 748                 port->writing = 0;
 749                 if (!result)
 750                         RETURN_FAIL("Previous write failed to complete");
 751                 DEBUG("Previous write completed");
 752         }
 753
 754         /* Set timeout. */
 755         if (port->timeouts.WriteTotalTimeoutConstant != timeout_ms) {
 756                 port->timeouts.WriteTotalTimeoutConstant = timeout_ms;
 757                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 758                         RETURN_FAIL("SetCommTimeouts() failed");
 759         }
 760
 761         /* Start write. */
 762         if (WriteFile(port->hdl, buf, count, NULL, &port->write_ovl)) {
 763                 DEBUG("Write completed immediately");
 764                 RETURN_INT(count);
 765         } else if (GetLastError() == ERROR_IO_PENDING) {
 766                 DEBUG("Waiting for write to complete");
 767                 if (GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE) == 0)
 768                         RETURN_FAIL("GetOverlappedResult() failed");
 769                 DEBUG_FMT("Write completed, %d/%d bytes written", bytes_written, count);
 770                 RETURN_INT(bytes_written);
 771         } else {
 772                 RETURN_FAIL("WriteFile() failed");
 773         }
 774 #else
 775         size_t bytes_written = 0;
 776         unsigned char *ptr = (unsigned char *) buf;
 777         struct timeval start, delta, now, end = {0, 0};
 778         int started = 0;
 779         fd_set fds;
 780         int result;
 781
 782         if (timeout_ms) {
 783                 /* Get time at start of operation. */
 784                 gettimeofday(&start, NULL);
 785                 /* Define duration of timeout. */
 786                 delta.tv_sec = timeout_ms / 1000;
 787                 delta.tv_usec = (timeout_ms % 1000) * 1000;
 788                 /* Calculate time at which we should give up. */
 789                 timeradd(&start, &delta, &end);
 790         }
 791
 792         FD_ZERO(&fds);
 793         FD_SET(port->fd, &fds);
 794
 795         /* Loop until we have written the requested number of bytes. */
 796         while (bytes_written < count) {
 797                 /*
 798                  * Check timeout only if we have run select() at least once,
 799                  * to avoid any issues if a short timeout is reached before
 800                  * select() is even run.
 801                  */
 802                 if (timeout_ms && started) {
 803                         gettimeofday(&now, NULL);
 804                         if (timercmp(&now, &end, >))
 805                                 /* Timeout has expired. */
 806                                 break;
 807                         timersub(&end, &now, &delta);
 808                 }
 809                 result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &delta : NULL);
 810                 started = 1;
 811                 if (result < 0) {
 812                         if (errno == EINTR) {
 813                                 DEBUG("select() call was interrupted, repeating");
 814                                 continue;
 815                         } else {
 816                                 RETURN_FAIL("select() failed");
 817                         }
 818                 } else if (result == 0) {
 819                         /* Timeout has expired. */
 820                         break;
 821                 }
 822
 823                 /* Do write. */
 824                 result = write(port->fd, ptr, count - bytes_written);
 825
 826                 if (result < 0) {
 827                         if (errno == EAGAIN)
 828                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
 829                                 continue;
 830                         else
 831                                 /* This is an actual failure. */
 832                                 RETURN_FAIL("write() failed");
 833                 }
 834
 835                 bytes_written += result;
 836                 ptr += result;
 837         }
 838
 839         if (bytes_written < count)
 840                 DEBUG("Write timed out");
 841
 842         RETURN_INT(bytes_written);
 843 #endif
 844 }
 845
 846 SP_API enum sp_return sp_nonblocking_write(struct sp_port *port,
 847                                            const void *buf, size_t count)
 848 {
 849         TRACE("%p, %p, %d", port, buf, count);
 850
 851         CHECK_OPEN_PORT();
 852
 853         if (!buf)
 854                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 855
 856         DEBUG_FMT("Writing up to %d bytes to port %s", count, port->name);
 857
 858         if (count == 0)
 859                 RETURN_INT(0);
 860
 861 #ifdef _WIN32
 862         DWORD written = 0;
 863         BYTE *ptr = (BYTE *) buf;
 864
 865         /* Check whether previous write is complete. */
 866         if (port->writing) {
 867                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 868                         DEBUG("Previous write completed");
 869                         port->writing = 0;
 870                 } else {
 871                         DEBUG("Previous write not complete");
 872                         /* Can't take a new write until the previous one finishes. */
 873                         RETURN_INT(0);
 874                 }
 875         }
 876
 877         /* Set timeout. */
 878         if (port->timeouts.WriteTotalTimeoutConstant != 0) {
 879                 port->timeouts.WriteTotalTimeoutConstant = 0;
 880                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 881                         RETURN_FAIL("SetCommTimeouts() failed");
 882         }
 883
 884         /*
 885          * Keep writing data until the OS has to actually start an async IO
 886          * for it. At that point we know the buffer is full.
 887          */
 888         while (written < count) {
 889                 /* Copy first byte of user buffer. */
 890                 port->pending_byte = *ptr++;
 891
 892                 /* Start asynchronous write. */
 893                 if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
 894                         if (GetLastError() == ERROR_IO_PENDING) {
 895                                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 896                                         DEBUG("Asynchronous write completed immediately");
 897                                         port->writing = 0;
 898                                         written++;
 899                                         continue;
 900                                 } else {
 901                                         DEBUG("Asynchronous write running");
 902                                         port->writing = 1;
 903                                         RETURN_INT(++written);
 904                                 }
 905                         } else {
 906                                 /* Actual failure of some kind. */
 907                                 RETURN_FAIL("WriteFile() failed");
 908                         }
 909                 } else {
 910                         DEBUG("Single byte written immediately");
 911                         written++;
 912                 }
 913         }
 914
 915         DEBUG("All bytes written immediately");
 916
 917         RETURN_INT(written);
 918 #else
 919         /* Returns the number of bytes written, or -1 upon failure. */
 920         ssize_t written = write(port->fd, buf, count);
 921
 922         if (written < 0)
 923                 RETURN_FAIL("write() failed");
 924         else
 925                 RETURN_INT(written);
 926 #endif
 927 }
 928
 929 #ifdef _WIN32
 930 /* Restart wait operation if buffer was emptied. */
 931 static enum sp_return restart_wait_if_needed(struct sp_port *port, unsigned int bytes_read)
 932 {
 933         DWORD errors;
 934         COMSTAT comstat;
 935
 936         if (bytes_read == 0)
 937                 RETURN_OK();
 938
 939         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
 940                 RETURN_FAIL("ClearCommError() failed");
 941
 942         if (comstat.cbInQue == 0)
 943                 TRY(restart_wait(port));
 944
 945         RETURN_OK();
 946 }
 947 #endif
 948
 949 SP_API enum sp_return sp_blocking_read(struct sp_port *port, void *buf,
 950                                        size_t count, unsigned int timeout_ms)
 951 {
 952         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 953
 954         CHECK_OPEN_PORT();
 955
 956         if (!buf)
 957                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 958
 959         if (timeout_ms)
 960                 DEBUG_FMT("Reading %d bytes from port %s, timeout %d ms",
 961                         count, port->name, timeout_ms);
 962         else
 963                 DEBUG_FMT("Reading %d bytes from port %s, no timeout",
 964                         count, port->name);
 965
 966         if (count == 0)
 967                 RETURN_INT(0);
 968
 969 #ifdef _WIN32
 970         DWORD bytes_read = 0;
 971
 972         /* Set timeout. */
 973         if (port->timeouts.ReadIntervalTimeout != 0 ||
 974                         port->timeouts.ReadTotalTimeoutMultiplier != 0 ||
 975                         port->timeouts.ReadTotalTimeoutConstant != timeout_ms) {
 976                 port->timeouts.ReadIntervalTimeout = 0;
 977                 port->timeouts.ReadTotalTimeoutMultiplier = 0;
 978                 port->timeouts.ReadTotalTimeoutConstant = timeout_ms;
 979                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 980                         RETURN_FAIL("SetCommTimeouts() failed");
 981         }
 982
 983         /* Start read. */
 984         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl)) {
 985                 DEBUG("Read completed immediately");
 986                 bytes_read = count;
 987         } else if (GetLastError() == ERROR_IO_PENDING) {
 988                 DEBUG("Waiting for read to complete");
 989                 if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
 990                         RETURN_FAIL("GetOverlappedResult() failed");
 991                 DEBUG_FMT("Read completed, %d/%d bytes read", bytes_read, count);
 992         } else {
 993                 RETURN_FAIL("ReadFile() failed");
 994         }
 995
 996         TRY(restart_wait_if_needed(port, bytes_read));
 997
 998         RETURN_INT(bytes_read);
 999
1000 #else
1001         size_t bytes_read = 0;
1002         unsigned char *ptr = (unsigned char *) buf;
1003         struct timeval start, delta, now, end = {0, 0};
1004         int started = 0;
1005         fd_set fds;
1006         int result;
1007
1008         if (timeout_ms) {
1009                 /* Get time at start of operation. */
1010                 gettimeofday(&start, NULL);
1011                 /* Define duration of timeout. */
1012                 delta.tv_sec = timeout_ms / 1000;
1013                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1014                 /* Calculate time at which we should give up. */
1015                 timeradd(&start, &delta, &end);
1016         }
1017
1018         FD_ZERO(&fds);
1019         FD_SET(port->fd, &fds);
1020
1021         /* Loop until we have the requested number of bytes. */
1022         while (bytes_read < count) {
1023                 /*
1024                  * Check timeout only if we have run select() at least once,
1025                  * to avoid any issues if a short timeout is reached before
1026                  * select() is even run.
1027                  */
1028                 if (timeout_ms && started) {
1029                         gettimeofday(&now, NULL);
1030                         if (timercmp(&now, &end, >))
1031                                 /* Timeout has expired. */
1032                                 break;
1033                         timersub(&end, &now, &delta);
1034                 }
1035                 result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
1036                 started = 1;
1037                 if (result < 0) {
1038                         if (errno == EINTR) {
1039                                 DEBUG("select() call was interrupted, repeating");
1040                                 continue;
1041                         } else {
1042                                 RETURN_FAIL("select() failed");
1043                         }
1044                 } else if (result == 0) {
1045                         /* Timeout has expired. */
1046                         break;
1047                 }
1048
1049                 /* Do read. */
1050                 result = read(port->fd, ptr, count - bytes_read);
1051
1052                 if (result < 0) {
1053                         if (errno == EAGAIN)
1054                                 /*
1055                                  * This shouldn't happen because we did a
1056                                  * select() first, but handle anyway.
1057                                  */
1058                                 continue;
1059                         else
1060                                 /* This is an actual failure. */
1061                                 RETURN_FAIL("read() failed");
1062                 }
1063
1064                 bytes_read += result;
1065                 ptr += result;
1066         }
1067
1068         if (bytes_read < count)
1069                 DEBUG("Read timed out");
1070
1071         RETURN_INT(bytes_read);
1072 #endif
1073 }
1074
1075 SP_API enum sp_return sp_blocking_read_next(struct sp_port *port, void *buf,
1076                                             size_t count, unsigned int timeout_ms)
1077 {
1078         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
1079
1080         CHECK_OPEN_PORT();
1081
1082         if (!buf)
1083                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1084
1085         if (count == 0)
1086                 RETURN_ERROR(SP_ERR_ARG, "Zero count");
1087
1088         if (timeout_ms)
1089                 DEBUG_FMT("Reading next max %d bytes from port %s, timeout %d ms",
1090                         count, port->name, timeout_ms);
1091         else
1092                 DEBUG_FMT("Reading next max %d bytes from port %s, no timeout",
1093                         count, port->name);
1094
1095 #ifdef _WIN32
1096         DWORD bytes_read = 0;
1097
1098         /* If timeout_ms == 0, set maximum timeout. */
1099         DWORD timeout_val = (timeout_ms == 0 ? MAXDWORD - 1 : timeout_ms);
1100
1101         /* Set timeout. */
1102         if (port->timeouts.ReadIntervalTimeout != MAXDWORD ||
1103                         port->timeouts.ReadTotalTimeoutMultiplier != MAXDWORD ||
1104                         port->timeouts.ReadTotalTimeoutConstant != timeout_val) {
1105                 port->timeouts.ReadIntervalTimeout = MAXDWORD;
1106                 port->timeouts.ReadTotalTimeoutMultiplier = MAXDWORD;
1107                 port->timeouts.ReadTotalTimeoutConstant = timeout_val;
1108                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1109                         RETURN_FAIL("SetCommTimeouts() failed");
1110         }
1111
1112         /* Loop until we have at least one byte, or timeout is reached. */
1113         while (bytes_read == 0) {
1114                 /* Start read. */
1115                 if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl)) {
1116                         DEBUG("Read completed immediately");
1117                         bytes_read = count;
1118                 } else if (GetLastError() == ERROR_IO_PENDING) {
1119                         DEBUG("Waiting for read to complete");
1120                         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1121                                 RETURN_FAIL("GetOverlappedResult() failed");
1122                         if (bytes_read > 0) {
1123                                 DEBUG("Read completed");
1124                         } else if (timeout_ms > 0) {
1125                                 DEBUG("Read timed out");
1126                                 break;
1127                         } else {
1128                                 DEBUG("Restarting read");
1129                         }
1130                 } else {
1131                         RETURN_FAIL("ReadFile() failed");
1132                 }
1133         }
1134
1135         TRY(restart_wait_if_needed(port, bytes_read));
1136
1137         RETURN_INT(bytes_read);
1138
1139 #else
1140         size_t bytes_read = 0;
1141         struct timeval start, delta, now, end = {0, 0};
1142         int started = 0;
1143         fd_set fds;
1144         int result;
1145
1146         if (timeout_ms) {
1147                 /* Get time at start of operation. */
1148                 gettimeofday(&start, NULL);
1149                 /* Define duration of timeout. */
1150                 delta.tv_sec = timeout_ms / 1000;
1151                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1152                 /* Calculate time at which we should give up. */
1153                 timeradd(&start, &delta, &end);
1154         }
1155
1156         FD_ZERO(&fds);
1157         FD_SET(port->fd, &fds);
1158
1159         /* Loop until we have at least one byte, or timeout is reached. */
1160         while (bytes_read == 0) {
1161                 /*
1162                  * Check timeout only if we have run select() at least once,
1163                  * to avoid any issues if a short timeout is reached before
1164                  * select() is even run.
1165                  */
1166                 if (timeout_ms && started) {
1167                         gettimeofday(&now, NULL);
1168                         if (timercmp(&now, &end, >))
1169                                 /* Timeout has expired. */
1170                                 break;
1171                         timersub(&end, &now, &delta);
1172                 }
1173                 result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
1174                 started = 1;
1175                 if (result < 0) {
1176                         if (errno == EINTR) {
1177                                 DEBUG("select() call was interrupted, repeating");
1178                                 continue;
1179                         } else {
1180                                 RETURN_FAIL("select() failed");
1181                         }
1182                 } else if (result == 0) {
1183                         /* Timeout has expired. */
1184                         break;
1185                 }
1186
1187                 /* Do read. */
1188                 result = read(port->fd, buf, count);
1189
1190                 if (result < 0) {
1191                         if (errno == EAGAIN)
1192                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
1193                                 continue;
1194                         else
1195                                 /* This is an actual failure. */
1196                                 RETURN_FAIL("read() failed");
1197                 }
1198
1199                 bytes_read = result;
1200         }
1201
1202         if (bytes_read == 0)
1203                 DEBUG("Read timed out");
1204
1205         RETURN_INT(bytes_read);
1206 #endif
1207 }
1208
1209 SP_API enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf,
1210                                           size_t count)
1211 {
1212         TRACE("%p, %p, %d", port, buf, count);
1213
1214         CHECK_OPEN_PORT();
1215
1216         if (!buf)
1217                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1218
1219         DEBUG_FMT("Reading up to %d bytes from port %s", count, port->name);
1220
1221 #ifdef _WIN32
1222         DWORD bytes_read;
1223
1224         /* Set timeout. */
1225         if (port->timeouts.ReadIntervalTimeout != MAXDWORD ||
1226                         port->timeouts.ReadTotalTimeoutMultiplier != 0 ||
1227                         port->timeouts.ReadTotalTimeoutConstant != 0) {
1228                 port->timeouts.ReadIntervalTimeout = MAXDWORD;
1229                 port->timeouts.ReadTotalTimeoutMultiplier = 0;
1230                 port->timeouts.ReadTotalTimeoutConstant = 0;
1231                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1232                         RETURN_FAIL("SetCommTimeouts() failed");
1233         }
1234
1235         /* Do read. */
1236         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0)
1237                 RETURN_FAIL("ReadFile() failed");
1238
1239         /* Get number of bytes read. */
1240         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1241                 RETURN_FAIL("GetOverlappedResult() failed");
1242
1243         TRY(restart_wait_if_needed(port, bytes_read));
1244
1245         RETURN_INT(bytes_read);
1246 #else
1247         ssize_t bytes_read;
1248
1249         /* Returns the number of bytes read, or -1 upon failure. */
1250         if ((bytes_read = read(port->fd, buf, count)) < 0) {
1251                 if (errno == EAGAIN)
1252                         /* No bytes available. */
1253                         bytes_read = 0;
1254                 else
1255                         /* This is an actual failure. */
1256                         RETURN_FAIL("read() failed");
1257         }
1258         RETURN_INT(bytes_read);
1259 #endif
1260 }
1261
1262 SP_API enum sp_return sp_input_waiting(struct sp_port *port)
1263 {
1264         TRACE("%p", port);
1265
1266         CHECK_OPEN_PORT();
1267
1268         DEBUG_FMT("Checking input bytes waiting on port %s", port->name);
1269
1270 #ifdef _WIN32
1271         DWORD errors;
1272         COMSTAT comstat;
1273
1274         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1275                 RETURN_FAIL("ClearCommError() failed");
1276         RETURN_INT(comstat.cbInQue);
1277 #else
1278         int bytes_waiting;
1279         if (ioctl(port->fd, TIOCINQ, &bytes_waiting) < 0)
1280                 RETURN_FAIL("TIOCINQ ioctl failed");
1281         RETURN_INT(bytes_waiting);
1282 #endif
1283 }
1284
1285 SP_API enum sp_return sp_output_waiting(struct sp_port *port)
1286 {
1287         TRACE("%p", port);
1288
1289         CHECK_OPEN_PORT();
1290
1291         DEBUG_FMT("Checking output bytes waiting on port %s", port->name);
1292
1293 #ifdef _WIN32
1294         DWORD errors;
1295         COMSTAT comstat;
1296
1297         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1298                 RETURN_FAIL("ClearCommError() failed");
1299         RETURN_INT(comstat.cbOutQue);
1300 #else
1301         int bytes_waiting;
1302         if (ioctl(port->fd, TIOCOUTQ, &bytes_waiting) < 0)
1303                 RETURN_FAIL("TIOCOUTQ ioctl failed");
1304         RETURN_INT(bytes_waiting);
1305 #endif
1306 }
1307
1308 SP_API enum sp_return sp_new_event_set(struct sp_event_set **result_ptr)
1309 {
1310         struct sp_event_set *result;
1311
1312         TRACE("%p", result_ptr);
1313
1314         if (!result_ptr)
1315                 RETURN_ERROR(SP_ERR_ARG, "Null result");
1316
1317         *result_ptr = NULL;
1318
1319         if (!(result = malloc(sizeof(struct sp_event_set))))
1320                 RETURN_ERROR(SP_ERR_MEM, "sp_event_set malloc() failed");
1321
1322         memset(result, 0, sizeof(struct sp_event_set));
1323
1324         *result_ptr = result;
1325
1326         RETURN_OK();
1327 }
1328
1329 static enum sp_return add_handle(struct sp_event_set *event_set,
1330                 event_handle handle, enum sp_event mask)
1331 {
1332         void *new_handles;
1333         enum sp_event *new_masks;
1334
1335         TRACE("%p, %d, %d", event_set, handle, mask);
1336
1337         if (!(new_handles = realloc(event_set->handles,
1338                         sizeof(event_handle) * (event_set->count + 1))))
1339                 RETURN_ERROR(SP_ERR_MEM, "Handle array realloc() failed");
1340
1341         event_set->handles = new_handles;
1342
1343         if (!(new_masks = realloc(event_set->masks,
1344                         sizeof(enum sp_event) * (event_set->count + 1))))
1345                 RETURN_ERROR(SP_ERR_MEM, "Mask array realloc() failed");
1346
1347         event_set->masks = new_masks;
1348
1349         ((event_handle *) event_set->handles)[event_set->count] = handle;
1350         event_set->masks[event_set->count] = mask;
1351
1352         event_set->count++;
1353
1354         RETURN_OK();
1355 }
1356
1357 SP_API enum sp_return sp_add_port_events(struct sp_event_set *event_set,
1358         const struct sp_port *port, enum sp_event mask)
1359 {
1360         TRACE("%p, %p, %d", event_set, port, mask);
1361
1362         if (!event_set)
1363                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1364
1365         if (!port)
1366                 RETURN_ERROR(SP_ERR_ARG, "Null port");
1367
1368         if (mask > (SP_EVENT_RX_READY | SP_EVENT_TX_READY | SP_EVENT_ERROR))
1369                 RETURN_ERROR(SP_ERR_ARG, "Invalid event mask");
1370
1371         if (!mask)
1372                 RETURN_OK();
1373
1374 #ifdef _WIN32
1375         enum sp_event handle_mask;
1376         if ((handle_mask = mask & SP_EVENT_TX_READY))
1377                 TRY(add_handle(event_set, port->write_ovl.hEvent, handle_mask));
1378         if ((handle_mask = mask & (SP_EVENT_RX_READY | SP_EVENT_ERROR)))
1379                 TRY(add_handle(event_set, port->wait_ovl.hEvent, handle_mask));
1380 #else
1381         TRY(add_handle(event_set, port->fd, mask));
1382 #endif
1383
1384         RETURN_OK();
1385 }
1386
1387 SP_API void sp_free_event_set(struct sp_event_set *event_set)
1388 {
1389         TRACE("%p", event_set);
1390
1391         if (!event_set) {
1392                 DEBUG("Null event set");
1393                 RETURN();
1394         }
1395
1396         DEBUG("Freeing event set");
1397
1398         if (event_set->handles)
1399                 free(event_set->handles);
1400         if (event_set->masks)
1401                 free(event_set->masks);
1402
1403         free(event_set);
1404
1405         RETURN();
1406 }
1407
1408 SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
1409                               unsigned int timeout_ms)
1410 {
1411         TRACE("%p, %d", event_set, timeout_ms);
1412
1413         if (!event_set)
1414                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1415
1416 #ifdef _WIN32
1417         if (WaitForMultipleObjects(event_set->count, event_set->handles, FALSE,
1418                         timeout_ms ? timeout_ms : INFINITE) == WAIT_FAILED)
1419                 RETURN_FAIL("WaitForMultipleObjects() failed");
1420
1421         RETURN_OK();
1422 #else
1423         struct timeval start, delta, now, end = {0, 0};
1424         int started = 0;
1425         int result, timeout_remaining_ms;
1426         struct pollfd *pollfds;
1427         unsigned int i;
1428
1429         if (!(pollfds = malloc(sizeof(struct pollfd) * event_set->count)))
1430                 RETURN_ERROR(SP_ERR_MEM, "pollfds malloc() failed");
1431
1432         for (i = 0; i < event_set->count; i++) {
1433                 pollfds[i].fd = ((int *) event_set->handles)[i];
1434                 pollfds[i].events = 0;
1435                 pollfds[i].revents = 0;
1436                 if (event_set->masks[i] & SP_EVENT_RX_READY)
1437                         pollfds[i].events |= POLLIN;
1438                 if (event_set->masks[i] & SP_EVENT_TX_READY)
1439                         pollfds[i].events |= POLLOUT;
1440                 if (event_set->masks[i] & SP_EVENT_ERROR)
1441                         pollfds[i].events |= POLLERR;
1442         }
1443
1444         if (timeout_ms) {
1445                 /* Get time at start of operation. */
1446                 gettimeofday(&start, NULL);
1447                 /* Define duration of timeout. */
1448                 delta.tv_sec = timeout_ms / 1000;
1449                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1450                 /* Calculate time at which we should give up. */
1451                 timeradd(&start, &delta, &end);
1452         }
1453
1454         /* Loop until an event occurs. */
1455         while (1) {
1456                 /*
1457                  * Check timeout only if we have run poll() at least once,
1458                  * to avoid any issues if a short timeout is reached before
1459                  * poll() is even run.
1460                  */
1461                 if (!timeout_ms) {
1462                         timeout_remaining_ms = -1;
1463                 } else if (!started) {
1464                         timeout_remaining_ms = timeout_ms;
1465                 } else {
1466                         gettimeofday(&now, NULL);
1467                         if (timercmp(&now, &end, >)) {
1468                                 DEBUG("Wait timed out");
1469                                 break;
1470                         }
1471                         timersub(&end, &now, &delta);
1472                         timeout_remaining_ms = delta.tv_sec * 1000 + delta.tv_usec / 1000;
1473                 }
1474
1475                 result = poll(pollfds, event_set->count, timeout_remaining_ms);
1476                 started = 1;
1477
1478                 if (result < 0) {
1479                         if (errno == EINTR) {
1480                                 DEBUG("poll() call was interrupted, repeating");
1481                                 continue;
1482                         } else {
1483                                 free(pollfds);
1484                                 RETURN_FAIL("poll() failed");
1485                         }
1486                 } else if (result == 0) {
1487                         DEBUG("poll() timed out");
1488                         break;
1489                 } else {
1490                         DEBUG("poll() completed");
1491                         break;
1492                 }
1493         }
1494
1495         free(pollfds);
1496         RETURN_OK();
1497 #endif
1498 }
1499
1500 #ifdef USE_TERMIOS_SPEED
1501 static enum sp_return get_baudrate(int fd, int *baudrate)
1502 {
1503         void *data;
1504
1505         TRACE("%d, %p", fd, baudrate);
1506
1507         DEBUG("Getting baud rate");
1508
1509         if (!(data = malloc(get_termios_size())))
1510                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1511
1512         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1513                 free(data);
1514                 RETURN_FAIL("Getting termios failed");
1515         }
1516
1517         *baudrate = get_termios_speed(data);
1518
1519         free(data);
1520
1521         RETURN_OK();
1522 }
1523
1524 static enum sp_return set_baudrate(int fd, int baudrate)
1525 {
1526         void *data;
1527
1528         TRACE("%d, %d", fd, baudrate);
1529
1530         DEBUG("Getting baud rate");
1531
1532         if (!(data = malloc(get_termios_size())))
1533                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1534
1535         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1536                 free(data);
1537                 RETURN_FAIL("Getting termios failed");
1538         }
1539
1540         DEBUG("Setting baud rate");
1541
1542         set_termios_speed(data, baudrate);
1543
1544         if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
1545                 free(data);
1546                 RETURN_FAIL("Setting termios failed");
1547         }
1548
1549         free(data);
1550
1551         RETURN_OK();
1552 }
1553 #endif /* USE_TERMIOS_SPEED */
1554
1555 #ifdef USE_TERMIOX
1556 static enum sp_return get_flow(int fd, struct port_data *data)
1557 {
1558         void *termx;
1559
1560         TRACE("%d, %p", fd, data);
1561
1562         DEBUG("Getting advanced flow control");
1563
1564         if (!(termx = malloc(get_termiox_size())))
1565                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1566
1567         if (ioctl(fd, TCGETX, termx) < 0) {
1568                 free(termx);
1569                 RETURN_FAIL("Getting termiox failed");
1570         }
1571
1572         get_termiox_flow(termx, &data->rts_flow, &data->cts_flow,
1573                         &data->dtr_flow, &data->dsr_flow);
1574
1575         free(termx);
1576
1577         RETURN_OK();
1578 }
1579
1580 static enum sp_return set_flow(int fd, struct port_data *data)
1581 {
1582         void *termx;
1583
1584         TRACE("%d, %p", fd, data);
1585
1586         DEBUG("Getting advanced flow control");
1587
1588         if (!(termx = malloc(get_termiox_size())))
1589                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1590
1591         if (ioctl(fd, TCGETX, termx) < 0) {
1592                 free(termx);
1593                 RETURN_FAIL("Getting termiox failed");
1594         }
1595
1596         DEBUG("Setting advanced flow control");
1597
1598         set_termiox_flow(termx, data->rts_flow, data->cts_flow,
1599                         data->dtr_flow, data->dsr_flow);
1600
1601         if (ioctl(fd, TCSETX, termx) < 0) {
1602                 free(termx);
1603                 RETURN_FAIL("Setting termiox failed");
1604         }
1605
1606         free(termx);
1607
1608         RETURN_OK();
1609 }
1610 #endif /* USE_TERMIOX */
1611
1612 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
1613         struct sp_port_config *config)
1614 {
1615         unsigned int i;
1616
1617         TRACE("%p, %p, %p", port, data, config);
1618
1619         DEBUG_FMT("Getting configuration for port %s", port->name);
1620
1621 #ifdef _WIN32
1622         if (!GetCommState(port->hdl, &data->dcb))
1623                 RETURN_FAIL("GetCommState() failed");
1624
1625         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1626                 if (data->dcb.BaudRate == std_baudrates[i].index) {
1627                         config->baudrate = std_baudrates[i].value;
1628                         break;
1629                 }
1630         }
1631
1632         if (i == NUM_STD_BAUDRATES)
1633                 /* BaudRate field can be either an index or a custom baud rate. */
1634                 config->baudrate = data->dcb.BaudRate;
1635
1636         config->bits = data->dcb.ByteSize;
1637
1638         if (data->dcb.fParity)
1639                 switch (data->dcb.Parity) {
1640                 case NOPARITY:
1641                         config->parity = SP_PARITY_NONE;
1642                         break;
1643                 case ODDPARITY:
1644                         config->parity = SP_PARITY_ODD;
1645                         break;
1646                 case EVENPARITY:
1647                         config->parity = SP_PARITY_EVEN;
1648                         break;
1649                 case MARKPARITY:
1650                         config->parity = SP_PARITY_MARK;
1651                         break;
1652                 case SPACEPARITY:
1653                         config->parity = SP_PARITY_SPACE;
1654                         break;
1655                 default:
1656                         config->parity = -1;
1657                 }
1658         else
1659                 config->parity = SP_PARITY_NONE;
1660
1661         switch (data->dcb.StopBits) {
1662         case ONESTOPBIT:
1663                 config->stopbits = 1;
1664                 break;
1665         case TWOSTOPBITS:
1666                 config->stopbits = 2;
1667                 break;
1668         default:
1669                 config->stopbits = -1;
1670         }
1671
1672         switch (data->dcb.fRtsControl) {
1673         case RTS_CONTROL_DISABLE:
1674                 config->rts = SP_RTS_OFF;
1675                 break;
1676         case RTS_CONTROL_ENABLE:
1677                 config->rts = SP_RTS_ON;
1678                 break;
1679         case RTS_CONTROL_HANDSHAKE:
1680                 config->rts = SP_RTS_FLOW_CONTROL;
1681                 break;
1682         default:
1683                 config->rts = -1;
1684         }
1685
1686         config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1687
1688         switch (data->dcb.fDtrControl) {
1689         case DTR_CONTROL_DISABLE:
1690                 config->dtr = SP_DTR_OFF;
1691                 break;
1692         case DTR_CONTROL_ENABLE:
1693                 config->dtr = SP_DTR_ON;
1694                 break;
1695         case DTR_CONTROL_HANDSHAKE:
1696                 config->dtr = SP_DTR_FLOW_CONTROL;
1697                 break;
1698         default:
1699                 config->dtr = -1;
1700         }
1701
1702         config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1703
1704         if (data->dcb.fInX) {
1705                 if (data->dcb.fOutX)
1706                         config->xon_xoff = SP_XONXOFF_INOUT;
1707                 else
1708                         config->xon_xoff = SP_XONXOFF_IN;
1709         } else {
1710                 if (data->dcb.fOutX)
1711                         config->xon_xoff = SP_XONXOFF_OUT;
1712                 else
1713                         config->xon_xoff = SP_XONXOFF_DISABLED;
1714         }
1715
1716 #else // !_WIN32
1717
1718         if (tcgetattr(port->fd, &data->term) < 0)
1719                 RETURN_FAIL("tcgetattr() failed");
1720
1721         if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
1722                 RETURN_FAIL("TIOCMGET ioctl failed");
1723
1724 #ifdef USE_TERMIOX
1725         int ret = get_flow(port->fd, data);
1726
1727         if (ret == SP_ERR_FAIL && errno == EINVAL)
1728                 data->termiox_supported = 0;
1729         else if (ret < 0)
1730                 RETURN_CODEVAL(ret);
1731         else
1732                 data->termiox_supported = 1;
1733 #else
1734         data->termiox_supported = 0;
1735 #endif
1736
1737         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1738                 if (cfgetispeed(&data->term) == std_baudrates[i].index) {
1739                         config->baudrate = std_baudrates[i].value;
1740                         break;
1741                 }
1742         }
1743
1744         if (i == NUM_STD_BAUDRATES) {
1745 #ifdef __APPLE__
1746                 config->baudrate = (int)data->term.c_ispeed;
1747 #elif defined(USE_TERMIOS_SPEED)
1748                 TRY(get_baudrate(port->fd, &config->baudrate));
1749 #else
1750                 config->baudrate = -1;
1751 #endif
1752         }
1753
1754         switch (data->term.c_cflag & CSIZE) {
1755         case CS8:
1756                 config->bits = 8;
1757                 break;
1758         case CS7:
1759                 config->bits = 7;
1760                 break;
1761         case CS6:
1762                 config->bits = 6;
1763                 break;
1764         case CS5:
1765                 config->bits = 5;
1766                 break;
1767         default:
1768                 config->bits = -1;
1769         }
1770
1771         if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
1772                 config->parity = SP_PARITY_NONE;
1773         else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
1774                 config->parity = -1;
1775 #ifdef CMSPAR
1776         else if (data->term.c_cflag & CMSPAR)
1777                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_MARK : SP_PARITY_SPACE;
1778 #endif
1779         else
1780                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
1781
1782         config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
1783
1784         if (data->term.c_cflag & CRTSCTS) {
1785                 config->rts = SP_RTS_FLOW_CONTROL;
1786                 config->cts = SP_CTS_FLOW_CONTROL;
1787         } else {
1788                 if (data->termiox_supported && data->rts_flow)
1789                         config->rts = SP_RTS_FLOW_CONTROL;
1790                 else
1791                         config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
1792
1793                 config->cts = (data->termiox_supported && data->cts_flow) ?
1794                         SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1795         }
1796
1797         if (data->termiox_supported && data->dtr_flow)
1798                 config->dtr = SP_DTR_FLOW_CONTROL;
1799         else
1800                 config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
1801
1802         config->dsr = (data->termiox_supported && data->dsr_flow) ?
1803                 SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1804
1805         if (data->term.c_iflag & IXOFF) {
1806                 if (data->term.c_iflag & IXON)
1807                         config->xon_xoff = SP_XONXOFF_INOUT;
1808                 else
1809                         config->xon_xoff = SP_XONXOFF_IN;
1810         } else {
1811                 if (data->term.c_iflag & IXON)
1812                         config->xon_xoff = SP_XONXOFF_OUT;
1813                 else
1814                         config->xon_xoff = SP_XONXOFF_DISABLED;
1815         }
1816 #endif
1817
1818         RETURN_OK();
1819 }
1820
1821 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
1822         const struct sp_port_config *config)
1823 {
1824         unsigned int i;
1825 #ifdef __APPLE__
1826         BAUD_TYPE baud_nonstd;
1827
1828         baud_nonstd = B0;
1829 #endif
1830 #ifdef USE_TERMIOS_SPEED
1831         int baud_nonstd = 0;
1832 #endif
1833
1834         TRACE("%p, %p, %p", port, data, config);
1835
1836         DEBUG_FMT("Setting configuration for port %s", port->name);
1837
1838 #ifdef _WIN32
1839         if (config->baudrate >= 0) {
1840                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1841                         if (config->baudrate == std_baudrates[i].value) {
1842                                 data->dcb.BaudRate = std_baudrates[i].index;
1843                                 break;
1844                         }
1845                 }
1846
1847                 if (i == NUM_STD_BAUDRATES)
1848                         data->dcb.BaudRate = config->baudrate;
1849         }
1850
1851         if (config->bits >= 0)
1852                 data->dcb.ByteSize = config->bits;
1853
1854         if (config->parity >= 0) {
1855                 switch (config->parity) {
1856                 case SP_PARITY_NONE:
1857                         data->dcb.Parity = NOPARITY;
1858                         break;
1859                 case SP_PARITY_ODD:
1860                         data->dcb.Parity = ODDPARITY;
1861                         break;
1862                 case SP_PARITY_EVEN:
1863                         data->dcb.Parity = EVENPARITY;
1864                         break;
1865                 case SP_PARITY_MARK:
1866                         data->dcb.Parity = MARKPARITY;
1867                         break;
1868                 case SP_PARITY_SPACE:
1869                         data->dcb.Parity = SPACEPARITY;
1870                         break;
1871                 default:
1872                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1873                 }
1874         }
1875
1876         if (config->stopbits >= 0) {
1877                 switch (config->stopbits) {
1878                 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
1879                 case 1:
1880                         data->dcb.StopBits = ONESTOPBIT;
1881                         break;
1882                 case 2:
1883                         data->dcb.StopBits = TWOSTOPBITS;
1884                         break;
1885                 default:
1886                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bit setting");
1887                 }
1888         }
1889
1890         if (config->rts >= 0) {
1891                 switch (config->rts) {
1892                 case SP_RTS_OFF:
1893                         data->dcb.fRtsControl = RTS_CONTROL_DISABLE;
1894                         break;
1895                 case SP_RTS_ON:
1896                         data->dcb.fRtsControl = RTS_CONTROL_ENABLE;
1897                         break;
1898                 case SP_RTS_FLOW_CONTROL:
1899                         data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
1900                         break;
1901                 default:
1902                         RETURN_ERROR(SP_ERR_ARG, "Invalid RTS setting");
1903                 }
1904         }
1905
1906         if (config->cts >= 0) {
1907                 switch (config->cts) {
1908                 case SP_CTS_IGNORE:
1909                         data->dcb.fOutxCtsFlow = FALSE;
1910                         break;
1911                 case SP_CTS_FLOW_CONTROL:
1912                         data->dcb.fOutxCtsFlow = TRUE;
1913                         break;
1914                 default:
1915                         RETURN_ERROR(SP_ERR_ARG, "Invalid CTS setting");
1916                 }
1917         }
1918
1919         if (config->dtr >= 0) {
1920                 switch (config->dtr) {
1921                 case SP_DTR_OFF:
1922                         data->dcb.fDtrControl = DTR_CONTROL_DISABLE;
1923                         break;
1924                 case SP_DTR_ON:
1925                         data->dcb.fDtrControl = DTR_CONTROL_ENABLE;
1926                         break;
1927                 case SP_DTR_FLOW_CONTROL:
1928                         data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
1929                         break;
1930                 default:
1931                         RETURN_ERROR(SP_ERR_ARG, "Invalid DTR setting");
1932                 }
1933         }
1934
1935         if (config->dsr >= 0) {
1936                 switch (config->dsr) {
1937                 case SP_DSR_IGNORE:
1938                         data->dcb.fOutxDsrFlow = FALSE;
1939                         break;
1940                 case SP_DSR_FLOW_CONTROL:
1941                         data->dcb.fOutxDsrFlow = TRUE;
1942                         break;
1943                 default:
1944                         RETURN_ERROR(SP_ERR_ARG, "Invalid DSR setting");
1945                 }
1946         }
1947
1948         if (config->xon_xoff >= 0) {
1949                 switch (config->xon_xoff) {
1950                 case SP_XONXOFF_DISABLED:
1951                         data->dcb.fInX = FALSE;
1952                         data->dcb.fOutX = FALSE;
1953                         break;
1954                 case SP_XONXOFF_IN:
1955                         data->dcb.fInX = TRUE;
1956                         data->dcb.fOutX = FALSE;
1957                         break;
1958                 case SP_XONXOFF_OUT:
1959                         data->dcb.fInX = FALSE;
1960                         data->dcb.fOutX = TRUE;
1961                         break;
1962                 case SP_XONXOFF_INOUT:
1963                         data->dcb.fInX = TRUE;
1964                         data->dcb.fOutX = TRUE;
1965                         break;
1966                 default:
1967                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1968                 }
1969         }
1970
1971         if (!SetCommState(port->hdl, &data->dcb))
1972                 RETURN_FAIL("SetCommState() failed");
1973
1974 #else /* !_WIN32 */
1975
1976         int controlbits;
1977
1978         if (config->baudrate >= 0) {
1979                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1980                         if (config->baudrate == std_baudrates[i].value) {
1981                                 if (cfsetospeed(&data->term, std_baudrates[i].index) < 0)
1982                                         RETURN_FAIL("cfsetospeed() failed");
1983
1984                                 if (cfsetispeed(&data->term, std_baudrates[i].index) < 0)
1985                                         RETURN_FAIL("cfsetispeed() failed");
1986                                 break;
1987                         }
1988                 }
1989
1990                 /* Non-standard baud rate */
1991                 if (i == NUM_STD_BAUDRATES) {
1992 #ifdef __APPLE__
1993                         /* Set "dummy" baud rate. */
1994                         if (cfsetspeed(&data->term, B9600) < 0)
1995                                 RETURN_FAIL("cfsetspeed() failed");
1996                         baud_nonstd = config->baudrate;
1997 #elif defined(USE_TERMIOS_SPEED)
1998                         baud_nonstd = 1;
1999 #else
2000                         RETURN_ERROR(SP_ERR_SUPP, "Non-standard baudrate not supported");
2001 #endif
2002                 }
2003         }
2004
2005         if (config->bits >= 0) {
2006                 data->term.c_cflag &= ~CSIZE;
2007                 switch (config->bits) {
2008                 case 8:
2009                         data->term.c_cflag |= CS8;
2010                         break;
2011                 case 7:
2012                         data->term.c_cflag |= CS7;
2013                         break;
2014                 case 6:
2015                         data->term.c_cflag |= CS6;
2016                         break;
2017                 case 5:
2018                         data->term.c_cflag |= CS5;
2019                         break;
2020                 default:
2021                         RETURN_ERROR(SP_ERR_ARG, "Invalid data bits setting");
2022                 }
2023         }
2024
2025         if (config->parity >= 0) {
2026                 data->term.c_iflag &= ~IGNPAR;
2027                 data->term.c_cflag &= ~(PARENB | PARODD);
2028 #ifdef CMSPAR
2029                 data->term.c_cflag &= ~CMSPAR;
2030 #endif
2031                 switch (config->parity) {
2032                 case SP_PARITY_NONE:
2033                         data->term.c_iflag |= IGNPAR;
2034                         break;
2035                 case SP_PARITY_EVEN:
2036                         data->term.c_cflag |= PARENB;
2037                         break;
2038                 case SP_PARITY_ODD:
2039                         data->term.c_cflag |= PARENB | PARODD;
2040                         break;
2041 #ifdef CMSPAR
2042                 case SP_PARITY_MARK:
2043                         data->term.c_cflag |= PARENB | PARODD;
2044                         data->term.c_cflag |= CMSPAR;
2045                         break;
2046                 case SP_PARITY_SPACE:
2047                         data->term.c_cflag |= PARENB;
2048                         data->term.c_cflag |= CMSPAR;
2049                         break;
2050 #else
2051                 case SP_PARITY_MARK:
2052                 case SP_PARITY_SPACE:
2053                         RETURN_ERROR(SP_ERR_SUPP, "Mark/space parity not supported");
2054 #endif
2055                 default:
2056                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
2057                 }
2058         }
2059
2060         if (config->stopbits >= 0) {
2061                 data->term.c_cflag &= ~CSTOPB;
2062                 switch (config->stopbits) {
2063                 case 1:
2064                         data->term.c_cflag &= ~CSTOPB;
2065                         break;
2066                 case 2:
2067                         data->term.c_cflag |= CSTOPB;
2068                         break;
2069                 default:
2070                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bits setting");
2071                 }
2072         }
2073
2074         if (config->rts >= 0 || config->cts >= 0) {
2075                 if (data->termiox_supported) {
2076                         data->rts_flow = data->cts_flow = 0;
2077                         switch (config->rts) {
2078                         case SP_RTS_OFF:
2079                         case SP_RTS_ON:
2080                                 controlbits = TIOCM_RTS;
2081                                 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
2082                                         RETURN_FAIL("Setting RTS signal level failed");
2083                                 break;
2084                         case SP_RTS_FLOW_CONTROL:
2085                                 data->rts_flow = 1;
2086                                 break;
2087                         default:
2088                                 break;
2089                         }
2090                         if (config->cts == SP_CTS_FLOW_CONTROL)
2091                                 data->cts_flow = 1;
2092
2093                         if (data->rts_flow && data->cts_flow)
2094                                 data->term.c_iflag |= CRTSCTS;
2095                         else
2096                                 data->term.c_iflag &= ~CRTSCTS;
2097                 } else {
2098                         /* Asymmetric use of RTS/CTS not supported. */
2099                         if (data->term.c_iflag & CRTSCTS) {
2100                                 /* Flow control can only be disabled for both RTS & CTS together. */
2101                                 if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
2102                                         if (config->cts != SP_CTS_IGNORE)
2103                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
2104                                 }
2105                                 if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
2106                                         if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
2107                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
2108                                 }
2109                         } else {
2110                                 /* Flow control can only be enabled for both RTS & CTS together. */
2111                                 if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
2112                                         ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
2113                                         RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be enabled together");
2114                         }
2115
2116                         if (config->rts >= 0) {
2117                                 if (config->rts == SP_RTS_FLOW_CONTROL) {
2118                                         data->term.c_iflag |= CRTSCTS;
2119                                 } else {
2120                                         controlbits = TIOCM_RTS;
2121                                         if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
2122                                                         &controlbits) < 0)
2123                                                 RETURN_FAIL("Setting RTS signal level failed");
2124                                 }
2125                         }
2126                 }
2127         }
2128
2129         if (config->dtr >= 0 || config->dsr >= 0) {
2130                 if (data->termiox_supported) {
2131                         data->dtr_flow = data->dsr_flow = 0;
2132                         switch (config->dtr) {
2133                         case SP_DTR_OFF:
2134                         case SP_DTR_ON:
2135                                 controlbits = TIOCM_DTR;
2136                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
2137                                         RETURN_FAIL("Setting DTR signal level failed");
2138                                 break;
2139                         case SP_DTR_FLOW_CONTROL:
2140                                 data->dtr_flow = 1;
2141                                 break;
2142                         default:
2143                                 break;
2144                         }
2145                         if (config->dsr == SP_DSR_FLOW_CONTROL)
2146                                 data->dsr_flow = 1;
2147                 } else {
2148                         /* DTR/DSR flow control not supported. */
2149                         if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
2150                                 RETURN_ERROR(SP_ERR_SUPP, "DTR/DSR flow control not supported");
2151
2152                         if (config->dtr >= 0) {
2153                                 controlbits = TIOCM_DTR;
2154                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
2155                                                 &controlbits) < 0)
2156                                         RETURN_FAIL("Setting DTR signal level failed");
2157                         }
2158                 }
2159         }
2160
2161         if (config->xon_xoff >= 0) {
2162                 data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
2163                 switch (config->xon_xoff) {
2164                 case SP_XONXOFF_DISABLED:
2165                         break;
2166                 case SP_XONXOFF_IN:
2167                         data->term.c_iflag |= IXOFF;
2168                         break;
2169                 case SP_XONXOFF_OUT:
2170                         data->term.c_iflag |= IXON | IXANY;
2171                         break;
2172                 case SP_XONXOFF_INOUT:
2173                         data->term.c_iflag |= IXON | IXOFF | IXANY;
2174                         break;
2175                 default:
2176                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
2177                 }
2178         }
2179
2180         if (tcsetattr(port->fd, TCSANOW, &data->term) < 0)
2181                 RETURN_FAIL("tcsetattr() failed");
2182
2183 #ifdef __APPLE__
2184         if (baud_nonstd != B0) {
2185                 if (ioctl(port->fd, IOSSIOSPEED, &baud_nonstd) == -1)
2186                         RETURN_FAIL("IOSSIOSPEED ioctl failed");
2187                 /*
2188                  * Set baud rates in data->term to correct, but incompatible
2189                  * with tcsetattr() value, same as delivered by tcgetattr().
2190                  */
2191                 if (cfsetspeed(&data->term, baud_nonstd) < 0)
2192                         RETURN_FAIL("cfsetspeed() failed");
2193         }
2194 #elif defined(__linux__)
2195 #ifdef USE_TERMIOS_SPEED
2196         if (baud_nonstd)
2197                 TRY(set_baudrate(port->fd, config->baudrate));
2198 #endif
2199 #ifdef USE_TERMIOX
2200         if (data->termiox_supported)
2201                 TRY(set_flow(port->fd, data));
2202 #endif
2203 #endif
2204
2205 #endif /* !_WIN32 */
2206
2207         RETURN_OK();
2208 }
2209
2210 SP_API enum sp_return sp_new_config(struct sp_port_config **config_ptr)
2211 {
2212         struct sp_port_config *config;
2213
2214         TRACE("%p", config_ptr);
2215
2216         if (!config_ptr)
2217                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2218
2219         *config_ptr = NULL;
2220
2221         if (!(config = malloc(sizeof(struct sp_port_config))))
2222                 RETURN_ERROR(SP_ERR_MEM, "Config malloc failed");
2223
2224         config->baudrate = -1;
2225         config->bits = -1;
2226         config->parity = -1;
2227         config->stopbits = -1;
2228         config->rts = -1;
2229         config->cts = -1;
2230         config->dtr = -1;
2231         config->dsr = -1;
2232
2233         *config_ptr = config;
2234
2235         RETURN_OK();
2236 }
2237
2238 SP_API void sp_free_config(struct sp_port_config *config)
2239 {
2240         TRACE("%p", config);
2241
2242         if (!config)
2243                 DEBUG("Null config");
2244         else
2245                 free(config);
2246
2247         RETURN();
2248 }
2249
2250 SP_API enum sp_return sp_get_config(struct sp_port *port,
2251                                     struct sp_port_config *config)
2252 {
2253         struct port_data data;
2254
2255         TRACE("%p, %p", port, config);
2256
2257         CHECK_OPEN_PORT();
2258
2259         if (!config)
2260                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2261
2262         TRY(get_config(port, &data, config));
2263
2264         RETURN_OK();
2265 }
2266
2267 SP_API enum sp_return sp_set_config(struct sp_port *port,
2268                                     const struct sp_port_config *config)
2269 {
2270         struct port_data data;
2271         struct sp_port_config prev_config;
2272
2273         TRACE("%p, %p", port, config);
2274
2275         CHECK_OPEN_PORT();
2276
2277         if (!config)
2278                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2279
2280         TRY(get_config(port, &data, &prev_config));
2281         TRY(set_config(port, &data, config));
2282
2283         RETURN_OK();
2284 }
2285
2286 #define CREATE_ACCESSORS(x, type) \
2287 SP_API enum sp_return sp_set_##x(struct sp_port *port, type x) { \
2288         struct port_data data; \
2289         struct sp_port_config config; \
2290         TRACE("%p, %d", port, x); \
2291         CHECK_OPEN_PORT(); \
2292         TRY(get_config(port, &data, &config)); \
2293         config.x = x; \
2294         TRY(set_config(port, &data, &config)); \
2295         RETURN_OK(); \
2296 } \
2297 SP_API enum sp_return sp_get_config_##x(const struct sp_port_config *config, \
2298                                         type *x) { \
2299         TRACE("%p, %p", config, x); \
2300         if (!x) \
2301                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer"); \
2302         if (!config) \
2303                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2304         *x = config->x; \
2305         RETURN_OK(); \
2306 } \
2307 SP_API enum sp_return sp_set_config_##x(struct sp_port_config *config, \
2308                                         type x) { \
2309         TRACE("%p, %d", config, x); \
2310         if (!config) \
2311                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2312         config->x = x; \
2313         RETURN_OK(); \
2314 }
2315
2316 CREATE_ACCESSORS(baudrate, int)
2317 CREATE_ACCESSORS(bits, int)
2318 CREATE_ACCESSORS(parity, enum sp_parity)
2319 CREATE_ACCESSORS(stopbits, int)
2320 CREATE_ACCESSORS(rts, enum sp_rts)
2321 CREATE_ACCESSORS(cts, enum sp_cts)
2322 CREATE_ACCESSORS(dtr, enum sp_dtr)
2323 CREATE_ACCESSORS(dsr, enum sp_dsr)
2324 CREATE_ACCESSORS(xon_xoff, enum sp_xonxoff)
2325
2326 SP_API enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config,
2327                                                 enum sp_flowcontrol flowcontrol)
2328 {
2329         if (!config)
2330                 RETURN_ERROR(SP_ERR_ARG, "Null configuration");
2331
2332         if (flowcontrol > SP_FLOWCONTROL_DTRDSR)
2333                 RETURN_ERROR(SP_ERR_ARG, "Invalid flow control setting");
2334
2335         if (flowcontrol == SP_FLOWCONTROL_XONXOFF)
2336                 config->xon_xoff = SP_XONXOFF_INOUT;
2337         else
2338                 config->xon_xoff = SP_XONXOFF_DISABLED;
2339
2340         if (flowcontrol == SP_FLOWCONTROL_RTSCTS) {
2341                 config->rts = SP_RTS_FLOW_CONTROL;
2342                 config->cts = SP_CTS_FLOW_CONTROL;
2343         } else {
2344                 if (config->rts == SP_RTS_FLOW_CONTROL)
2345                         config->rts = SP_RTS_ON;
2346                 config->cts = SP_CTS_IGNORE;
2347         }
2348
2349         if (flowcontrol == SP_FLOWCONTROL_DTRDSR) {
2350                 config->dtr = SP_DTR_FLOW_CONTROL;
2351                 config->dsr = SP_DSR_FLOW_CONTROL;
2352         } else {
2353                 if (config->dtr == SP_DTR_FLOW_CONTROL)
2354                         config->dtr = SP_DTR_ON;
2355                 config->dsr = SP_DSR_IGNORE;
2356         }
2357
2358         RETURN_OK();
2359 }
2360
2361 SP_API enum sp_return sp_set_flowcontrol(struct sp_port *port,
2362                                          enum sp_flowcontrol flowcontrol)
2363 {
2364         struct port_data data;
2365         struct sp_port_config config;
2366
2367         TRACE("%p, %d", port, flowcontrol);
2368
2369         CHECK_OPEN_PORT();
2370
2371         TRY(get_config(port, &data, &config));
2372
2373         TRY(sp_set_config_flowcontrol(&config, flowcontrol));
2374
2375         TRY(set_config(port, &data, &config));
2376
2377         RETURN_OK();
2378 }
2379
2380 SP_API enum sp_return sp_get_signals(struct sp_port *port,
2381                                      enum sp_signal *signals)
2382 {
2383         TRACE("%p, %p", port, signals);
2384
2385         CHECK_OPEN_PORT();
2386
2387         if (!signals)
2388                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2389
2390         DEBUG_FMT("Getting control signals for port %s", port->name);
2391
2392         *signals = 0;
2393 #ifdef _WIN32
2394         DWORD bits;
2395         if (GetCommModemStatus(port->hdl, &bits) == 0)
2396                 RETURN_FAIL("GetCommModemStatus() failed");
2397         if (bits & MS_CTS_ON)
2398                 *signals |= SP_SIG_CTS;
2399         if (bits & MS_DSR_ON)
2400                 *signals |= SP_SIG_DSR;
2401         if (bits & MS_RLSD_ON)
2402                 *signals |= SP_SIG_DCD;
2403         if (bits & MS_RING_ON)
2404                 *signals |= SP_SIG_RI;
2405 #else
2406         int bits;
2407         if (ioctl(port->fd, TIOCMGET, &bits) < 0)
2408                 RETURN_FAIL("TIOCMGET ioctl failed");
2409         if (bits & TIOCM_CTS)
2410                 *signals |= SP_SIG_CTS;
2411         if (bits & TIOCM_DSR)
2412                 *signals |= SP_SIG_DSR;
2413         if (bits & TIOCM_CAR)
2414                 *signals |= SP_SIG_DCD;
2415         if (bits & TIOCM_RNG)
2416                 *signals |= SP_SIG_RI;
2417 #endif
2418         RETURN_OK();
2419 }
2420
2421 SP_API enum sp_return sp_start_break(struct sp_port *port)
2422 {
2423         TRACE("%p", port);
2424
2425         CHECK_OPEN_PORT();
2426 #ifdef _WIN32
2427         if (SetCommBreak(port->hdl) == 0)
2428                 RETURN_FAIL("SetCommBreak() failed");
2429 #else
2430         if (ioctl(port->fd, TIOCSBRK, 1) < 0)
2431                 RETURN_FAIL("TIOCSBRK ioctl failed");
2432 #endif
2433
2434         RETURN_OK();
2435 }
2436
2437 SP_API enum sp_return sp_end_break(struct sp_port *port)
2438 {
2439         TRACE("%p", port);
2440
2441         CHECK_OPEN_PORT();
2442 #ifdef _WIN32
2443         if (ClearCommBreak(port->hdl) == 0)
2444                 RETURN_FAIL("ClearCommBreak() failed");
2445 #else
2446         if (ioctl(port->fd, TIOCCBRK, 1) < 0)
2447                 RETURN_FAIL("TIOCCBRK ioctl failed");
2448 #endif
2449
2450         RETURN_OK();
2451 }
2452
2453 SP_API int sp_last_error_code(void)
2454 {
2455         TRACE_VOID();
2456 #ifdef _WIN32
2457         RETURN_INT(GetLastError());
2458 #else
2459         RETURN_INT(errno);
2460 #endif
2461 }
2462
2463 SP_API char *sp_last_error_message(void)
2464 {
2465         TRACE_VOID();
2466
2467 #ifdef _WIN32
2468         TCHAR *message;
2469         DWORD error = GetLastError();
2470
2471         DWORD length = FormatMessage(
2472                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
2473                 FORMAT_MESSAGE_FROM_SYSTEM |
2474                 FORMAT_MESSAGE_IGNORE_INSERTS,
2475                 NULL,
2476                 error,
2477                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
2478                 (LPTSTR) &message,
2479                 0, NULL );
2480
2481         if (length >= 2 && message[length - 2] == '\r')
2482                 message[length - 2] = '\0';
2483
2484         RETURN_STRING(message);
2485 #else
2486         RETURN_STRING(strerror(errno));
2487 #endif
2488 }
2489
2490 SP_API void sp_free_error_message(char *message)
2491 {
2492         TRACE("%s", message);
2493
2494 #ifdef _WIN32
2495         LocalFree(message);
2496 #else
2497         (void)message;
2498 #endif
2499
2500         RETURN();
2501 }
2502
2503 SP_API void sp_set_debug_handler(void (*handler)(const char *format, ...))
2504 {
2505         TRACE("%p", handler);
2506
2507         sp_debug_handler = handler;
2508
2509         RETURN();
2510 }
2511
2512 SP_API void sp_default_debug_handler(const char *format, ...)
2513 {
2514         va_list args;
2515         va_start(args, format);
2516         if (getenv("LIBSERIALPORT_DEBUG")) {
2517                 fputs("sp: ", stderr);
2518                 vfprintf(stderr, format, args);
2519         }
2520         va_end(args);
2521 }
2522
2523 SP_API int sp_get_major_package_version(void)
2524 {
2525         return SP_PACKAGE_VERSION_MAJOR;
2526 }
2527
2528 SP_API int sp_get_minor_package_version(void)
2529 {
2530         return SP_PACKAGE_VERSION_MINOR;
2531 }
2532
2533 SP_API int sp_get_micro_package_version(void)
2534 {
2535         return SP_PACKAGE_VERSION_MICRO;
2536 }
2537
2538 SP_API const char *sp_get_package_version_string(void)
2539 {
2540         return SP_PACKAGE_VERSION_STRING;
2541 }
2542
2543 SP_API int sp_get_current_lib_version(void)
2544 {
2545         return SP_LIB_VERSION_CURRENT;
2546 }
2547
2548 SP_API int sp_get_revision_lib_version(void)
2549 {
2550         return SP_LIB_VERSION_REVISION;
2551 }
2552
2553 SP_API int sp_get_age_lib_version(void)
2554 {
2555         return SP_LIB_VERSION_AGE;
2556 }
2557
2558 SP_API const char *sp_get_lib_version_string(void)
2559 {
2560         return SP_LIB_VERSION_STRING;
2561 }
2562
2563 /** @} */