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) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
   6  * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
   7  * Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
   8  * 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 "libserialport.h"
  25 #include "libserialport_internal.h"
  26
  27 static const struct std_baudrate std_baudrates[] = {
  28 #ifdef _WIN32
  29         /*
  30          * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
  31          * have documented CBR_* macros.
  32          */
  33         BAUD(110), BAUD(300), BAUD(600), BAUD(1200), BAUD(2400), BAUD(4800),
  34         BAUD(9600), BAUD(14400), BAUD(19200), BAUD(38400), BAUD(57600),
  35         BAUD(115200), BAUD(128000), BAUD(256000),
  36 #else
  37         BAUD(50), BAUD(75), BAUD(110), BAUD(134), BAUD(150), BAUD(200),
  38         BAUD(300), BAUD(600), BAUD(1200), BAUD(1800), BAUD(2400), BAUD(4800),
  39         BAUD(9600), BAUD(19200), BAUD(38400), BAUD(57600), BAUD(115200),
  40         BAUD(230400),
  41 #if !defined(__APPLE__) && !defined(__OpenBSD__)
  42         BAUD(460800),
  43 #endif
  44 #endif
  45 };
  46
  47 #define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
  48
  49 void (*sp_debug_handler)(const char *format, ...) = sp_default_debug_handler;
  50
  51 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
  52         struct sp_port_config *config);
  53
  54 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
  55         const struct sp_port_config *config);
  56
  57 SP_API enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
  58 {
  59         struct sp_port *port;
  60 #ifndef NO_PORT_METADATA
  61         enum sp_return ret;
  62 #endif
  63         int len;
  64
  65         TRACE("%s, %p", portname, port_ptr);
  66
  67         if (!port_ptr)
  68                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
  69
  70         *port_ptr = NULL;
  71
  72         if (!portname)
  73                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
  74
  75         DEBUG_FMT("Building structure for port %s", portname);
  76
  77         if (!(port = malloc(sizeof(struct sp_port))))
  78                 RETURN_ERROR(SP_ERR_MEM, "Port structure malloc failed");
  79
  80         len = strlen(portname) + 1;
  81
  82         if (!(port->name = malloc(len))) {
  83                 free(port);
  84                 RETURN_ERROR(SP_ERR_MEM, "Port name malloc failed");
  85         }
  86
  87         memcpy(port->name, portname, len);
  88
  89 #ifdef _WIN32
  90         port->usb_path = NULL;
  91         port->hdl = INVALID_HANDLE_VALUE;
  92 #else
  93         port->fd = -1;
  94 #endif
  95
  96         port->description = NULL;
  97         port->transport = SP_TRANSPORT_NATIVE;
  98         port->usb_bus = -1;
  99         port->usb_address = -1;
 100         port->usb_vid = -1;
 101         port->usb_pid = -1;
 102         port->usb_manufacturer = NULL;
 103         port->usb_product = NULL;
 104         port->usb_serial = NULL;
 105         port->bluetooth_address = NULL;
 106
 107 #ifndef NO_PORT_METADATA
 108         if ((ret = get_port_details(port)) != SP_OK) {
 109                 sp_free_port(port);
 110                 return ret;
 111         }
 112 #endif
 113
 114         *port_ptr = port;
 115
 116         RETURN_OK();
 117 }
 118
 119 SP_API char *sp_get_port_name(const struct sp_port *port)
 120 {
 121         TRACE("%p", port);
 122
 123         if (!port)
 124                 return NULL;
 125
 126         RETURN_STRING(port->name);
 127 }
 128
 129 SP_API char *sp_get_port_description(const struct sp_port *port)
 130 {
 131         TRACE("%p", port);
 132
 133         if (!port || !port->description)
 134                 return NULL;
 135
 136         RETURN_STRING(port->description);
 137 }
 138
 139 SP_API enum sp_transport sp_get_port_transport(const struct sp_port *port)
 140 {
 141         TRACE("%p", port);
 142
 143         if (!port)
 144                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 145
 146         RETURN_INT(port->transport);
 147 }
 148
 149 SP_API enum sp_return sp_get_port_usb_bus_address(const struct sp_port *port,
 150                                                   int *usb_bus,int *usb_address)
 151 {
 152         TRACE("%p", port);
 153
 154         if (!port)
 155                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 156         if (port->transport != SP_TRANSPORT_USB)
 157                 RETURN_ERROR(SP_ERR_ARG, "Port does not use USB transport");
 158         if (port->usb_bus < 0 || port->usb_address < 0)
 159                 RETURN_ERROR(SP_ERR_SUPP, "Bus and address values are not available");
 160
 161         if (usb_bus)
 162                 *usb_bus = port->usb_bus;
 163         if (usb_address)
 164                 *usb_address = port->usb_address;
 165
 166         RETURN_OK();
 167 }
 168
 169 SP_API enum sp_return sp_get_port_usb_vid_pid(const struct sp_port *port,
 170                                               int *usb_vid, int *usb_pid)
 171 {
 172         TRACE("%p", port);
 173
 174         if (!port)
 175                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 176         if (port->transport != SP_TRANSPORT_USB)
 177                 RETURN_ERROR(SP_ERR_ARG, "Port does not use USB transport");
 178         if (port->usb_vid < 0 || port->usb_pid < 0)
 179                 RETURN_ERROR(SP_ERR_SUPP, "VID:PID values are not available");
 180
 181         if (usb_vid)
 182                 *usb_vid = port->usb_vid;
 183         if (usb_pid)
 184                 *usb_pid = port->usb_pid;
 185
 186         RETURN_OK();
 187 }
 188
 189 SP_API char *sp_get_port_usb_manufacturer(const struct sp_port *port)
 190 {
 191         TRACE("%p", port);
 192
 193         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_manufacturer)
 194                 return NULL;
 195
 196         RETURN_STRING(port->usb_manufacturer);
 197 }
 198
 199 SP_API char *sp_get_port_usb_product(const struct sp_port *port)
 200 {
 201         TRACE("%p", port);
 202
 203         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_product)
 204                 return NULL;
 205
 206         RETURN_STRING(port->usb_product);
 207 }
 208
 209 SP_API char *sp_get_port_usb_serial(const struct sp_port *port)
 210 {
 211         TRACE("%p", port);
 212
 213         if (!port || port->transport != SP_TRANSPORT_USB || !port->usb_serial)
 214                 return NULL;
 215
 216         RETURN_STRING(port->usb_serial);
 217 }
 218
 219 SP_API char *sp_get_port_bluetooth_address(const struct sp_port *port)
 220 {
 221         TRACE("%p", port);
 222
 223         if (!port || port->transport != SP_TRANSPORT_BLUETOOTH
 224             || !port->bluetooth_address)
 225                 return NULL;
 226
 227         RETURN_STRING(port->bluetooth_address);
 228 }
 229
 230 SP_API enum sp_return sp_get_port_handle(const struct sp_port *port,
 231                                          void *result_ptr)
 232 {
 233         TRACE("%p, %p", port, result_ptr);
 234
 235         if (!port)
 236                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 237         if (!result_ptr)
 238                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 239
 240 #ifdef _WIN32
 241         HANDLE *handle_ptr = result_ptr;
 242         *handle_ptr = port->hdl;
 243 #else
 244         int *fd_ptr = result_ptr;
 245         *fd_ptr = port->fd;
 246 #endif
 247
 248         RETURN_OK();
 249 }
 250
 251 SP_API enum sp_return sp_copy_port(const struct sp_port *port,
 252                                    struct sp_port **copy_ptr)
 253 {
 254         TRACE("%p, %p", port, copy_ptr);
 255
 256         if (!copy_ptr)
 257                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 258
 259         *copy_ptr = NULL;
 260
 261         if (!port)
 262                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 263
 264         if (!port->name)
 265                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
 266
 267         DEBUG("Copying port structure");
 268
 269         RETURN_INT(sp_get_port_by_name(port->name, copy_ptr));
 270 }
 271
 272 SP_API void sp_free_port(struct sp_port *port)
 273 {
 274         TRACE("%p", port);
 275
 276         if (!port) {
 277                 DEBUG("Null port");
 278                 RETURN();
 279         }
 280
 281         DEBUG("Freeing port structure");
 282
 283         if (port->name)
 284                 free(port->name);
 285         if (port->description)
 286                 free(port->description);
 287         if (port->usb_manufacturer)
 288                 free(port->usb_manufacturer);
 289         if (port->usb_product)
 290                 free(port->usb_product);
 291         if (port->usb_serial)
 292                 free(port->usb_serial);
 293         if (port->bluetooth_address)
 294                 free(port->bluetooth_address);
 295 #ifdef _WIN32
 296         if (port->usb_path)
 297                 free(port->usb_path);
 298 #endif
 299
 300         free(port);
 301
 302         RETURN();
 303 }
 304
 305 SP_PRIV struct sp_port **list_append(struct sp_port **list,
 306                                      const char *portname)
 307 {
 308         void *tmp;
 309         unsigned int count;
 310
 311         for (count = 0; list[count]; count++);
 312         if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2))))
 313                 goto fail;
 314         list = tmp;
 315         if (sp_get_port_by_name(portname, &list[count]) != SP_OK)
 316                 goto fail;
 317         list[count + 1] = NULL;
 318         return list;
 319
 320 fail:
 321         sp_free_port_list(list);
 322         return NULL;
 323 }
 324
 325 SP_API enum sp_return sp_list_ports(struct sp_port ***list_ptr)
 326 {
 327 #ifndef NO_ENUMERATION
 328         struct sp_port **list;
 329         int ret;
 330 #endif
 331
 332         TRACE("%p", list_ptr);
 333
 334         if (!list_ptr)
 335                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 336
 337         *list_ptr = NULL;
 338
 339 #ifdef NO_ENUMERATION
 340         RETURN_ERROR(SP_ERR_SUPP, "Enumeration not supported on this platform");
 341 #else
 342         DEBUG("Enumerating ports");
 343
 344         if (!(list = malloc(sizeof(struct sp_port *))))
 345                 RETURN_ERROR(SP_ERR_MEM, "Port list malloc failed");
 346
 347         list[0] = NULL;
 348
 349         ret = list_ports(&list);
 350
 351         if (ret == SP_OK) {
 352                 *list_ptr = list;
 353         } else {
 354                 sp_free_port_list(list);
 355                 *list_ptr = NULL;
 356         }
 357
 358         RETURN_CODEVAL(ret);
 359 #endif
 360 }
 361
 362 SP_API void sp_free_port_list(struct sp_port **list)
 363 {
 364         unsigned int i;
 365
 366         TRACE("%p", list);
 367
 368         if (!list) {
 369                 DEBUG("Null list");
 370                 RETURN();
 371         }
 372
 373         DEBUG("Freeing port list");
 374
 375         for (i = 0; list[i]; i++)
 376                 sp_free_port(list[i]);
 377         free(list);
 378
 379         RETURN();
 380 }
 381
 382 #define CHECK_PORT() do { \
 383         if (!port) \
 384                 RETURN_ERROR(SP_ERR_ARG, "Null port"); \
 385         if (!port->name) \
 386                 RETURN_ERROR(SP_ERR_ARG, "Null port name"); \
 387 } while (0)
 388 #ifdef _WIN32
 389 #define CHECK_PORT_HANDLE() do { \
 390         if (port->hdl == INVALID_HANDLE_VALUE) \
 391                 RETURN_ERROR(SP_ERR_ARG, "Invalid port handle"); \
 392 } while (0)
 393 #else
 394 #define CHECK_PORT_HANDLE() do { \
 395         if (port->fd < 0) \
 396                 RETURN_ERROR(SP_ERR_ARG, "Invalid port fd"); \
 397 } while (0)
 398 #endif
 399 #define CHECK_OPEN_PORT() do { \
 400         CHECK_PORT(); \
 401         CHECK_PORT_HANDLE(); \
 402 } while (0)
 403
 404 #ifdef WIN32
 405 /** To be called after port receive buffer is emptied. */
 406 static enum sp_return restart_wait(struct sp_port *port)
 407 {
 408         DWORD wait_result;
 409
 410         if (port->wait_running) {
 411                 /* Check status of running wait operation. */
 412                 if (GetOverlappedResult(port->hdl, &port->wait_ovl,
 413                                 &wait_result, FALSE)) {
 414                         DEBUG("Previous wait completed");
 415                         port->wait_running = FALSE;
 416                 } else if (GetLastError() == ERROR_IO_INCOMPLETE) {
 417                         DEBUG("Previous wait still running");
 418                         RETURN_OK();
 419                 } else {
 420                         RETURN_FAIL("GetOverlappedResult() failed");
 421                 }
 422         }
 423
 424         if (!port->wait_running) {
 425                 /* Start new wait operation. */
 426                 if (WaitCommEvent(port->hdl, &port->events,
 427                                 &port->wait_ovl)) {
 428                         DEBUG("New wait returned, events already pending");
 429                 } else if (GetLastError() == ERROR_IO_PENDING) {
 430                         DEBUG("New wait running in background");
 431                         port->wait_running = TRUE;
 432                 } else {
 433                         RETURN_FAIL("WaitCommEvent() failed");
 434                 }
 435         }
 436
 437         RETURN_OK();
 438 }
 439 #endif
 440
 441 SP_API enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
 442 {
 443         struct port_data data;
 444         struct sp_port_config config;
 445         enum sp_return ret;
 446
 447         TRACE("%p, 0x%x", port, flags);
 448
 449         CHECK_PORT();
 450
 451         if (flags > SP_MODE_READ_WRITE)
 452                 RETURN_ERROR(SP_ERR_ARG, "Invalid flags");
 453
 454         DEBUG_FMT("Opening port %s", port->name);
 455
 456 #ifdef _WIN32
 457         DWORD desired_access = 0, flags_and_attributes = 0, errors;
 458         char *escaped_port_name;
 459         COMSTAT status;
 460
 461         /* Prefix port name with '\\.\' to work with ports above COM9. */
 462         if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
 463                 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
 464         sprintf(escaped_port_name, "\\\\.\\%s", port->name);
 465
 466         /* Map 'flags' to the OS-specific settings. */
 467         flags_and_attributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED;
 468         if (flags & SP_MODE_READ)
 469                 desired_access |= GENERIC_READ;
 470         if (flags & SP_MODE_WRITE)
 471                 desired_access |= GENERIC_WRITE;
 472
 473         port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0,
 474                          OPEN_EXISTING, flags_and_attributes, 0);
 475
 476         free(escaped_port_name);
 477
 478         if (port->hdl == INVALID_HANDLE_VALUE)
 479                 RETURN_FAIL("Port CreateFile() failed");
 480
 481         /* All timeouts initially disabled. */
 482         port->timeouts.ReadIntervalTimeout = 0;
 483         port->timeouts.ReadTotalTimeoutMultiplier = 0;
 484         port->timeouts.ReadTotalTimeoutConstant = 0;
 485         port->timeouts.WriteTotalTimeoutMultiplier = 0;
 486         port->timeouts.WriteTotalTimeoutConstant = 0;
 487
 488         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0) {
 489                 sp_close(port);
 490                 RETURN_FAIL("SetCommTimeouts() failed");
 491         }
 492
 493         /* Prepare OVERLAPPED structures. */
 494 #define INIT_OVERLAPPED(ovl) do { \
 495         memset(&port->ovl, 0, sizeof(port->ovl)); \
 496         port->ovl.hEvent = INVALID_HANDLE_VALUE; \
 497         if ((port->ovl.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL)) \
 498                         == INVALID_HANDLE_VALUE) { \
 499                 sp_close(port); \
 500                 RETURN_FAIL(#ovl "CreateEvent() failed"); \
 501         } \
 502 } while (0)
 503
 504         INIT_OVERLAPPED(read_ovl);
 505         INIT_OVERLAPPED(write_ovl);
 506         INIT_OVERLAPPED(wait_ovl);
 507
 508         /* Set event mask for RX and error events. */
 509         if (SetCommMask(port->hdl, EV_RXCHAR | EV_ERR) == 0) {
 510                 sp_close(port);
 511                 RETURN_FAIL("SetCommMask() failed");
 512         }
 513
 514         port->writing = FALSE;
 515         port->wait_running = FALSE;
 516
 517         ret = restart_wait(port);
 518
 519         if (ret < 0) {
 520                 sp_close(port);
 521                 RETURN_CODEVAL(ret);
 522         }
 523 #else
 524         int flags_local = O_NONBLOCK | O_NOCTTY;
 525
 526         /* Map 'flags' to the OS-specific settings. */
 527         if ((flags & SP_MODE_READ_WRITE) == SP_MODE_READ_WRITE)
 528                 flags_local |= O_RDWR;
 529         else if (flags & SP_MODE_READ)
 530                 flags_local |= O_RDONLY;
 531         else if (flags & SP_MODE_WRITE)
 532                 flags_local |= O_WRONLY;
 533
 534         if ((port->fd = open(port->name, flags_local)) < 0)
 535                 RETURN_FAIL("open() failed");
 536 #endif
 537
 538         ret = get_config(port, &data, &config);
 539
 540         if (ret < 0) {
 541                 sp_close(port);
 542                 RETURN_CODEVAL(ret);
 543         }
 544
 545         /* Set sane port settings. */
 546 #ifdef _WIN32
 547         data.dcb.fBinary = TRUE;
 548         data.dcb.fDsrSensitivity = FALSE;
 549         data.dcb.fErrorChar = FALSE;
 550         data.dcb.fNull = FALSE;
 551         data.dcb.fAbortOnError = FALSE;
 552 #else
 553         /* Turn off all fancy termios tricks, give us a raw channel. */
 554         data.term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IMAXBEL);
 555 #ifdef IUCLC
 556         data.term.c_iflag &= ~IUCLC;
 557 #endif
 558         data.term.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);
 559 #ifdef OLCUC
 560         data.term.c_oflag &= ~OLCUC;
 561 #endif
 562 #ifdef NLDLY
 563         data.term.c_oflag &= ~NLDLY;
 564 #endif
 565 #ifdef CRDLY
 566         data.term.c_oflag &= ~CRDLY;
 567 #endif
 568 #ifdef TABDLY
 569         data.term.c_oflag &= ~TABDLY;
 570 #endif
 571 #ifdef BSDLY
 572         data.term.c_oflag &= ~BSDLY;
 573 #endif
 574 #ifdef VTDLY
 575         data.term.c_oflag &= ~VTDLY;
 576 #endif
 577 #ifdef FFDLY
 578         data.term.c_oflag &= ~FFDLY;
 579 #endif
 580 #ifdef OFILL
 581         data.term.c_oflag &= ~OFILL;
 582 #endif
 583         data.term.c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN);
 584         data.term.c_cc[VMIN] = 0;
 585         data.term.c_cc[VTIME] = 0;
 586
 587         /* Ignore modem status lines; enable receiver; leave control lines alone on close. */
 588         data.term.c_cflag |= (CLOCAL | CREAD | HUPCL);
 589 #endif
 590
 591 #ifdef _WIN32
 592         if (ClearCommError(port->hdl, &errors, &status) == 0)
 593                 RETURN_FAIL("ClearCommError() failed");
 594 #endif
 595
 596         ret = set_config(port, &data, &config);
 597
 598         if (ret < 0) {
 599                 sp_close(port);
 600                 RETURN_CODEVAL(ret);
 601         }
 602
 603         RETURN_OK();
 604 }
 605
 606 SP_API enum sp_return sp_close(struct sp_port *port)
 607 {
 608         TRACE("%p", port);
 609
 610         CHECK_OPEN_PORT();
 611
 612         DEBUG_FMT("Closing port %s", port->name);
 613
 614 #ifdef _WIN32
 615         /* Returns non-zero upon success, 0 upon failure. */
 616         if (CloseHandle(port->hdl) == 0)
 617                 RETURN_FAIL("Port CloseHandle() failed");
 618         port->hdl = INVALID_HANDLE_VALUE;
 619
 620         /* Close event handles for overlapped structures. */
 621 #define CLOSE_OVERLAPPED(ovl) do { \
 622         if (port->ovl.hEvent != INVALID_HANDLE_VALUE && \
 623                 CloseHandle(port->ovl.hEvent) == 0) \
 624                 RETURN_FAIL(# ovl "event CloseHandle() failed"); \
 625 } while (0)
 626         CLOSE_OVERLAPPED(read_ovl);
 627         CLOSE_OVERLAPPED(write_ovl);
 628         CLOSE_OVERLAPPED(wait_ovl);
 629
 630 #else
 631         /* Returns 0 upon success, -1 upon failure. */
 632         if (close(port->fd) == -1)
 633                 RETURN_FAIL("close() failed");
 634         port->fd = -1;
 635 #endif
 636
 637         RETURN_OK();
 638 }
 639
 640 SP_API enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers)
 641 {
 642         TRACE("%p, 0x%x", port, buffers);
 643
 644         CHECK_OPEN_PORT();
 645
 646         if (buffers > SP_BUF_BOTH)
 647                 RETURN_ERROR(SP_ERR_ARG, "Invalid buffer selection");
 648
 649         const char *buffer_names[] = {"no", "input", "output", "both"};
 650
 651         DEBUG_FMT("Flushing %s buffers on port %s",
 652                 buffer_names[buffers], port->name);
 653
 654 #ifdef _WIN32
 655         DWORD flags = 0;
 656         if (buffers & SP_BUF_INPUT)
 657                 flags |= PURGE_RXCLEAR;
 658         if (buffers & SP_BUF_OUTPUT)
 659                 flags |= PURGE_TXCLEAR;
 660
 661         /* Returns non-zero upon success, 0 upon failure. */
 662         if (PurgeComm(port->hdl, flags) == 0)
 663                 RETURN_FAIL("PurgeComm() failed");
 664
 665         if (buffers & SP_BUF_INPUT)
 666                 TRY(restart_wait(port));
 667 #else
 668         int flags = 0;
 669         if (buffers == SP_BUF_BOTH)
 670                 flags = TCIOFLUSH;
 671         else if (buffers == SP_BUF_INPUT)
 672                 flags = TCIFLUSH;
 673         else if (buffers == SP_BUF_OUTPUT)
 674                 flags = TCOFLUSH;
 675
 676         /* Returns 0 upon success, -1 upon failure. */
 677         if (tcflush(port->fd, flags) < 0)
 678                 RETURN_FAIL("tcflush() failed");
 679 #endif
 680         RETURN_OK();
 681 }
 682
 683 SP_API enum sp_return sp_drain(struct sp_port *port)
 684 {
 685         TRACE("%p", port);
 686
 687         CHECK_OPEN_PORT();
 688
 689         DEBUG_FMT("Draining port %s", port->name);
 690
 691 #ifdef _WIN32
 692         /* Returns non-zero upon success, 0 upon failure. */
 693         if (FlushFileBuffers(port->hdl) == 0)
 694                 RETURN_FAIL("FlushFileBuffers() failed");
 695         RETURN_OK();
 696 #else
 697         int result;
 698         while (1) {
 699 #ifdef __ANDROID__
 700                 int arg = 1;
 701                 result = ioctl(port->fd, TCSBRK, &arg);
 702 #else
 703                 result = tcdrain(port->fd);
 704 #endif
 705                 if (result < 0) {
 706                         if (errno == EINTR) {
 707                                 DEBUG("tcdrain() was interrupted");
 708                                 continue;
 709                         } else {
 710                                 RETURN_FAIL("tcdrain() failed");
 711                         }
 712                 } else {
 713                         RETURN_OK();
 714                 }
 715         }
 716 #endif
 717 }
 718
 719 SP_API enum sp_return sp_blocking_write(struct sp_port *port, const void *buf,
 720                                         size_t count, unsigned int timeout_ms)
 721 {
 722         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 723
 724         CHECK_OPEN_PORT();
 725
 726         if (!buf)
 727                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 728
 729         if (timeout_ms)
 730                 DEBUG_FMT("Writing %d bytes to port %s, timeout %d ms",
 731                         count, port->name, timeout_ms);
 732         else
 733                 DEBUG_FMT("Writing %d bytes to port %s, no timeout",
 734                         count, port->name);
 735
 736         if (count == 0)
 737                 RETURN_INT(0);
 738
 739 #ifdef _WIN32
 740         DWORD bytes_written = 0;
 741         BOOL result;
 742
 743         /* Wait for previous non-blocking write to complete, if any. */
 744         if (port->writing) {
 745                 DEBUG("Waiting for previous write to complete");
 746                 result = GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
 747                 port->writing = 0;
 748                 if (!result)
 749                         RETURN_FAIL("Previous write failed to complete");
 750                 DEBUG("Previous write completed");
 751         }
 752
 753         /* Set timeout. */
 754         port->timeouts.WriteTotalTimeoutConstant = timeout_ms;
 755         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 756                 RETURN_FAIL("SetCommTimeouts() failed");
 757
 758         /* Start write. */
 759         if (WriteFile(port->hdl, buf, count, NULL, &port->write_ovl) == 0) {
 760                 if (GetLastError() == ERROR_IO_PENDING) {
 761                         DEBUG("Waiting for write to complete");
 762                         GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
 763                         DEBUG_FMT("Write completed, %d/%d bytes written", bytes_written, count);
 764                         RETURN_INT(bytes_written);
 765                 } else {
 766                         RETURN_FAIL("WriteFile() failed");
 767                 }
 768         } else {
 769                 DEBUG("Write completed immediately");
 770                 RETURN_INT(count);
 771         }
 772 #else
 773         size_t bytes_written = 0;
 774         unsigned char *ptr = (unsigned char *) buf;
 775         struct timeval start, delta, now, end = {0, 0};
 776         fd_set fds;
 777         int result;
 778
 779         if (timeout_ms) {
 780                 /* Get time at start of operation. */
 781                 gettimeofday(&start, NULL);
 782                 /* Define duration of timeout. */
 783                 delta.tv_sec = timeout_ms / 1000;
 784                 delta.tv_usec = (timeout_ms % 1000) * 1000;
 785                 /* Calculate time at which we should give up. */
 786                 timeradd(&start, &delta, &end);
 787         }
 788
 789         /* Loop until we have written the requested number of bytes. */
 790         while (bytes_written < count) {
 791                 /* Wait until space is available. */
 792                 FD_ZERO(&fds);
 793                 FD_SET(port->fd, &fds);
 794                 if (timeout_ms) {
 795                         gettimeofday(&now, NULL);
 796                         if (timercmp(&now, &end, >)) {
 797                                 DEBUG("Write timed out");
 798                                 RETURN_INT(bytes_written);
 799                         }
 800                         timersub(&end, &now, &delta);
 801                 }
 802                 result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &delta : NULL);
 803                 if (result < 0) {
 804                         if (errno == EINTR) {
 805                                 DEBUG("select() call was interrupted, repeating");
 806                                 continue;
 807                         } else {
 808                                 RETURN_FAIL("select() failed");
 809                         }
 810                 } else if (result == 0) {
 811                         DEBUG("Write timed out");
 812                         RETURN_INT(bytes_written);
 813                 }
 814
 815                 /* Do write. */
 816                 result = write(port->fd, ptr, count - bytes_written);
 817
 818                 if (result < 0) {
 819                         if (errno == EAGAIN)
 820                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
 821                                 continue;
 822                         else
 823                                 /* This is an actual failure. */
 824                                 RETURN_FAIL("write() failed");
 825                 }
 826
 827                 bytes_written += result;
 828                 ptr += result;
 829         }
 830
 831         RETURN_INT(bytes_written);
 832 #endif
 833 }
 834
 835 SP_API enum sp_return sp_nonblocking_write(struct sp_port *port,
 836                                            const void *buf, size_t count)
 837 {
 838         TRACE("%p, %p, %d", port, buf, count);
 839
 840         CHECK_OPEN_PORT();
 841
 842         if (!buf)
 843                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 844
 845         DEBUG_FMT("Writing up to %d bytes to port %s", count, port->name);
 846
 847         if (count == 0)
 848                 RETURN_INT(0);
 849
 850 #ifdef _WIN32
 851         DWORD written = 0;
 852         BYTE *ptr = (BYTE *) buf;
 853
 854         /* Check whether previous write is complete. */
 855         if (port->writing) {
 856                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 857                         DEBUG("Previous write completed");
 858                         port->writing = 0;
 859                 } else {
 860                         DEBUG("Previous write not complete");
 861                         /* Can't take a new write until the previous one finishes. */
 862                         RETURN_INT(0);
 863                 }
 864         }
 865
 866         /* Set timeout. */
 867         port->timeouts.WriteTotalTimeoutConstant = 0;
 868         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 869                 RETURN_FAIL("SetCommTimeouts() failed");
 870
 871         /*
 872          * Keep writing data until the OS has to actually start an async IO
 873          * for it. At that point we know the buffer is full.
 874          */
 875         while (written < count) {
 876                 /* Copy first byte of user buffer. */
 877                 port->pending_byte = *ptr++;
 878
 879                 /* Start asynchronous write. */
 880                 if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
 881                         if (GetLastError() == ERROR_IO_PENDING) {
 882                                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 883                                         DEBUG("Asynchronous write completed immediately");
 884                                         port->writing = 0;
 885                                         written++;
 886                                         continue;
 887                                 } else {
 888                                         DEBUG("Asynchronous write running");
 889                                         port->writing = 1;
 890                                         RETURN_INT(++written);
 891                                 }
 892                         } else {
 893                                 /* Actual failure of some kind. */
 894                                 RETURN_FAIL("WriteFile() failed");
 895                         }
 896                 } else {
 897                         DEBUG("Single byte written immediately");
 898                         written++;
 899                 }
 900         }
 901
 902         DEBUG("All bytes written immediately");
 903
 904         RETURN_INT(written);
 905 #else
 906         /* Returns the number of bytes written, or -1 upon failure. */
 907         ssize_t written = write(port->fd, buf, count);
 908
 909         if (written < 0)
 910                 RETURN_FAIL("write() failed");
 911         else
 912                 RETURN_INT(written);
 913 #endif
 914 }
 915
 916 SP_API enum sp_return sp_blocking_read(struct sp_port *port, void *buf,
 917                                        size_t count, unsigned int timeout_ms)
 918 {
 919         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 920
 921         CHECK_OPEN_PORT();
 922
 923         if (!buf)
 924                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 925
 926         if (timeout_ms)
 927                 DEBUG_FMT("Reading %d bytes from port %s, timeout %d ms",
 928                         count, port->name, timeout_ms);
 929         else
 930                 DEBUG_FMT("Reading %d bytes from port %s, no timeout",
 931                         count, port->name);
 932
 933         if (count == 0)
 934                 RETURN_INT(0);
 935
 936 #ifdef _WIN32
 937         DWORD bytes_read = 0;
 938         DWORD bytes_remaining;
 939         int ret;
 940
 941         /* Set timeout. */
 942         port->timeouts.ReadIntervalTimeout = 0;
 943         port->timeouts.ReadTotalTimeoutConstant = timeout_ms;
 944         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 945                 RETURN_FAIL("SetCommTimeouts() failed");
 946
 947         /* Start read. */
 948         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0) {
 949                 if (GetLastError() == ERROR_IO_PENDING) {
 950                         DEBUG("Waiting for read to complete");
 951                         GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE);
 952                         DEBUG_FMT("Read completed, %d/%d bytes read", bytes_read, count);
 953                 } else {
 954                         RETURN_FAIL("ReadFile() failed");
 955                 }
 956         } else {
 957                 DEBUG("Read completed immediately");
 958                 bytes_read = count;
 959         }
 960
 961         ret = sp_input_waiting(port);
 962
 963         if (ret < 0)
 964                 RETURN_CODEVAL(ret);
 965
 966         bytes_remaining = ret;
 967
 968         /* Restart wait operation if buffer was emptied. */
 969         if (bytes_read > 0 && bytes_remaining == 0)
 970                 TRY(restart_wait(port));
 971
 972         RETURN_INT(bytes_read);
 973
 974 #else
 975         size_t bytes_read = 0;
 976         unsigned char *ptr = (unsigned char *) buf;
 977         struct timeval start, delta, now, end = {0, 0};
 978         fd_set fds;
 979         int result;
 980
 981         if (timeout_ms) {
 982                 /* Get time at start of operation. */
 983                 gettimeofday(&start, NULL);
 984                 /* Define duration of timeout. */
 985                 delta.tv_sec = timeout_ms / 1000;
 986                 delta.tv_usec = (timeout_ms % 1000) * 1000;
 987                 /* Calculate time at which we should give up. */
 988                 timeradd(&start, &delta, &end);
 989         }
 990
 991         /* Loop until we have the requested number of bytes. */
 992         while (bytes_read < count) {
 993                 /* Wait until data is available. */
 994                 FD_ZERO(&fds);
 995                 FD_SET(port->fd, &fds);
 996                 if (timeout_ms) {
 997                         gettimeofday(&now, NULL);
 998                         if (timercmp(&now, &end, >))
 999                                 /* Timeout has expired. */
1000                                 RETURN_INT(bytes_read);
1001                         timersub(&end, &now, &delta);
1002                 }
1003                 result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
1004                 if (result < 0) {
1005                         if (errno == EINTR) {
1006                                 DEBUG("select() call was interrupted, repeating");
1007                                 continue;
1008                         } else {
1009                                 RETURN_FAIL("select() failed");
1010                         }
1011                 } else if (result == 0) {
1012                         DEBUG("Read timed out");
1013                         RETURN_INT(bytes_read);
1014                 }
1015
1016                 /* Do read. */
1017                 result = read(port->fd, ptr, count - bytes_read);
1018
1019                 if (result < 0) {
1020                         if (errno == EAGAIN)
1021                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
1022                                 continue;
1023                         else
1024                                 /* This is an actual failure. */
1025                                 RETURN_FAIL("read() failed");
1026                 }
1027
1028                 bytes_read += result;
1029                 ptr += result;
1030         }
1031
1032         RETURN_INT(bytes_read);
1033 #endif
1034 }
1035
1036 SP_API enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf,
1037                                           size_t count)
1038 {
1039         TRACE("%p, %p, %d", port, buf, count);
1040
1041         CHECK_OPEN_PORT();
1042
1043         if (!buf)
1044                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1045
1046         DEBUG_FMT("Reading up to %d bytes from port %s", count, port->name);
1047
1048 #ifdef _WIN32
1049         DWORD bytes_read;
1050         DWORD bytes_remaining;
1051         int ret;
1052
1053         /* Set timeout. */
1054         port->timeouts.ReadIntervalTimeout = MAXDWORD;
1055         port->timeouts.ReadTotalTimeoutConstant = 0;
1056         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1057                 RETURN_FAIL("SetCommTimeouts() failed");
1058
1059         /* Do read. */
1060         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0)
1061                 RETURN_FAIL("ReadFile() failed");
1062
1063         /* Get number of bytes read. */
1064         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1065                 RETURN_FAIL("GetOverlappedResult() failed");
1066
1067         ret = sp_input_waiting(port);
1068
1069         if (ret < 0)
1070                 RETURN_CODEVAL(ret);
1071
1072         bytes_remaining = ret;
1073
1074         /* Restart wait operation if buffer was emptied. */
1075         if (bytes_read > 0 && bytes_remaining == 0)
1076                 TRY(restart_wait(port));
1077
1078         RETURN_INT(bytes_read);
1079 #else
1080         ssize_t bytes_read;
1081
1082         /* Returns the number of bytes read, or -1 upon failure. */
1083         if ((bytes_read = read(port->fd, buf, count)) < 0) {
1084                 if (errno == EAGAIN)
1085                         /* No bytes available. */
1086                         bytes_read = 0;
1087                 else
1088                         /* This is an actual failure. */
1089                         RETURN_FAIL("read() failed");
1090         }
1091         RETURN_INT(bytes_read);
1092 #endif
1093 }
1094
1095 SP_API enum sp_return sp_input_waiting(struct sp_port *port)
1096 {
1097         TRACE("%p", port);
1098
1099         CHECK_OPEN_PORT();
1100
1101         DEBUG_FMT("Checking input bytes waiting on port %s", port->name);
1102
1103 #ifdef _WIN32
1104         DWORD errors;
1105         COMSTAT comstat;
1106
1107         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1108                 RETURN_FAIL("ClearCommError() failed");
1109         RETURN_INT(comstat.cbInQue);
1110 #else
1111         int bytes_waiting;
1112         if (ioctl(port->fd, TIOCINQ, &bytes_waiting) < 0)
1113                 RETURN_FAIL("TIOCINQ ioctl failed");
1114         RETURN_INT(bytes_waiting);
1115 #endif
1116 }
1117
1118 SP_API enum sp_return sp_output_waiting(struct sp_port *port)
1119 {
1120         TRACE("%p", port);
1121
1122         CHECK_OPEN_PORT();
1123
1124         DEBUG_FMT("Checking output bytes waiting on port %s", port->name);
1125
1126 #ifdef _WIN32
1127         DWORD errors;
1128         COMSTAT comstat;
1129
1130         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1131                 RETURN_FAIL("ClearCommError() failed");
1132         RETURN_INT(comstat.cbOutQue);
1133 #else
1134         int bytes_waiting;
1135         if (ioctl(port->fd, TIOCOUTQ, &bytes_waiting) < 0)
1136                 RETURN_FAIL("TIOCOUTQ ioctl failed");
1137         RETURN_INT(bytes_waiting);
1138 #endif
1139 }
1140
1141 SP_API enum sp_return sp_new_event_set(struct sp_event_set **result_ptr)
1142 {
1143         struct sp_event_set *result;
1144
1145         TRACE("%p", result_ptr);
1146
1147         if (!result_ptr)
1148                 RETURN_ERROR(SP_ERR_ARG, "Null result");
1149
1150         *result_ptr = NULL;
1151
1152         if (!(result = malloc(sizeof(struct sp_event_set))))
1153                 RETURN_ERROR(SP_ERR_MEM, "sp_event_set malloc() failed");
1154
1155         memset(result, 0, sizeof(struct sp_event_set));
1156
1157         *result_ptr = result;
1158
1159         RETURN_OK();
1160 }
1161
1162 static enum sp_return add_handle(struct sp_event_set *event_set,
1163                 event_handle handle, enum sp_event mask)
1164 {
1165         void *new_handles;
1166         enum sp_event *new_masks;
1167
1168         TRACE("%p, %d, %d", event_set, handle, mask);
1169
1170         if (!(new_handles = realloc(event_set->handles,
1171                         sizeof(event_handle) * (event_set->count + 1))))
1172                 RETURN_ERROR(SP_ERR_MEM, "Handle array realloc() failed");
1173
1174         event_set->handles = new_handles;
1175
1176         if (!(new_masks = realloc(event_set->masks,
1177                         sizeof(enum sp_event) * (event_set->count + 1))))
1178                 RETURN_ERROR(SP_ERR_MEM, "Mask array realloc() failed");
1179
1180         event_set->masks = new_masks;
1181
1182         ((event_handle *) event_set->handles)[event_set->count] = handle;
1183         event_set->masks[event_set->count] = mask;
1184
1185         event_set->count++;
1186
1187         RETURN_OK();
1188 }
1189
1190 SP_API enum sp_return sp_add_port_events(struct sp_event_set *event_set,
1191         const struct sp_port *port, enum sp_event mask)
1192 {
1193         TRACE("%p, %p, %d", event_set, port, mask);
1194
1195         if (!event_set)
1196                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1197
1198         if (!port)
1199                 RETURN_ERROR(SP_ERR_ARG, "Null port");
1200
1201         if (mask > (SP_EVENT_RX_READY | SP_EVENT_TX_READY | SP_EVENT_ERROR))
1202                 RETURN_ERROR(SP_ERR_ARG, "Invalid event mask");
1203
1204         if (!mask)
1205                 RETURN_OK();
1206
1207 #ifdef _WIN32
1208         enum sp_event handle_mask;
1209         if ((handle_mask = mask & SP_EVENT_TX_READY))
1210                 TRY(add_handle(event_set, port->write_ovl.hEvent, handle_mask));
1211         if ((handle_mask = mask & (SP_EVENT_RX_READY | SP_EVENT_ERROR)))
1212                 TRY(add_handle(event_set, port->wait_ovl.hEvent, handle_mask));
1213 #else
1214         TRY(add_handle(event_set, port->fd, mask));
1215 #endif
1216
1217         RETURN_OK();
1218 }
1219
1220 SP_API void sp_free_event_set(struct sp_event_set *event_set)
1221 {
1222         TRACE("%p", event_set);
1223
1224         if (!event_set) {
1225                 DEBUG("Null event set");
1226                 RETURN();
1227         }
1228
1229         DEBUG("Freeing event set");
1230
1231         if (event_set->handles)
1232                 free(event_set->handles);
1233         if (event_set->masks)
1234                 free(event_set->masks);
1235
1236         free(event_set);
1237
1238         RETURN();
1239 }
1240
1241 SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
1242                               unsigned int timeout_ms)
1243 {
1244         TRACE("%p, %d", event_set, timeout_ms);
1245
1246         if (!event_set)
1247                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1248
1249 #ifdef _WIN32
1250         if (WaitForMultipleObjects(event_set->count, event_set->handles, FALSE,
1251                         timeout_ms ? timeout_ms : INFINITE) == WAIT_FAILED)
1252                 RETURN_FAIL("WaitForMultipleObjects() failed");
1253
1254         RETURN_OK();
1255 #else
1256         struct timeval start, delta, now, end = {0, 0};
1257         int result, timeout_remaining_ms;
1258         struct pollfd *pollfds;
1259         unsigned int i;
1260
1261         if (!(pollfds = malloc(sizeof(struct pollfd) * event_set->count)))
1262                 RETURN_ERROR(SP_ERR_MEM, "pollfds malloc() failed");
1263
1264         for (i = 0; i < event_set->count; i++) {
1265                 pollfds[i].fd = ((int *) event_set->handles)[i];
1266                 pollfds[i].events = 0;
1267                 pollfds[i].revents = 0;
1268                 if (event_set->masks[i] & SP_EVENT_RX_READY)
1269                         pollfds[i].events |= POLLIN;
1270                 if (event_set->masks[i] & SP_EVENT_TX_READY)
1271                         pollfds[i].events |= POLLOUT;
1272                 if (event_set->masks[i] & SP_EVENT_ERROR)
1273                         pollfds[i].events |= POLLERR;
1274         }
1275
1276         if (timeout_ms) {
1277                 /* Get time at start of operation. */
1278                 gettimeofday(&start, NULL);
1279                 /* Define duration of timeout. */
1280                 delta.tv_sec = timeout_ms / 1000;
1281                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1282                 /* Calculate time at which we should give up. */
1283                 timeradd(&start, &delta, &end);
1284         }
1285
1286         /* Loop until an event occurs. */
1287         while (1) {
1288                 if (timeout_ms) {
1289                         gettimeofday(&now, NULL);
1290                         if (timercmp(&now, &end, >)) {
1291                                 DEBUG("Wait timed out");
1292                                 break;
1293                         }
1294                         timersub(&end, &now, &delta);
1295                         timeout_remaining_ms = delta.tv_sec * 1000 + delta.tv_usec / 1000;
1296                 }
1297
1298                 result = poll(pollfds, event_set->count, timeout_ms ? timeout_remaining_ms : -1);
1299
1300                 if (result < 0) {
1301                         if (errno == EINTR) {
1302                                 DEBUG("poll() call was interrupted, repeating");
1303                                 continue;
1304                         } else {
1305                                 free(pollfds);
1306                                 RETURN_FAIL("poll() failed");
1307                         }
1308                 } else if (result == 0) {
1309                         DEBUG("poll() timed out");
1310                         break;
1311                 } else {
1312                         DEBUG("poll() completed");
1313                         break;
1314                 }
1315         }
1316
1317         free(pollfds);
1318         RETURN_OK();
1319 #endif
1320 }
1321
1322 #ifdef USE_TERMIOS_SPEED
1323 static enum sp_return get_baudrate(int fd, int *baudrate)
1324 {
1325         void *data;
1326
1327         TRACE("%d, %p", fd, baudrate);
1328
1329         DEBUG("Getting baud rate");
1330
1331         if (!(data = malloc(get_termios_size())))
1332                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1333
1334         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1335                 free(data);
1336                 RETURN_FAIL("Getting termios failed");
1337         }
1338
1339         *baudrate = get_termios_speed(data);
1340
1341         free(data);
1342
1343         RETURN_OK();
1344 }
1345
1346 static enum sp_return set_baudrate(int fd, int baudrate)
1347 {
1348         void *data;
1349
1350         TRACE("%d, %d", fd, baudrate);
1351
1352         DEBUG("Getting baud rate");
1353
1354         if (!(data = malloc(get_termios_size())))
1355                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1356
1357         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1358                 free(data);
1359                 RETURN_FAIL("Getting termios failed");
1360         }
1361
1362         DEBUG("Setting baud rate");
1363
1364         set_termios_speed(data, baudrate);
1365
1366         if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
1367                 free(data);
1368                 RETURN_FAIL("Setting termios failed");
1369         }
1370
1371         free(data);
1372
1373         RETURN_OK();
1374 }
1375 #endif /* USE_TERMIOS_SPEED */
1376
1377 #ifdef USE_TERMIOX
1378 static enum sp_return get_flow(int fd, struct port_data *data)
1379 {
1380         void *termx;
1381
1382         TRACE("%d, %p", fd, data);
1383
1384         DEBUG("Getting advanced flow control");
1385
1386         if (!(termx = malloc(get_termiox_size())))
1387                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1388
1389         if (ioctl(fd, TCGETX, termx) < 0) {
1390                 free(termx);
1391                 RETURN_FAIL("Getting termiox failed");
1392         }
1393
1394         get_termiox_flow(termx, &data->rts_flow, &data->cts_flow,
1395                         &data->dtr_flow, &data->dsr_flow);
1396
1397         free(termx);
1398
1399         RETURN_OK();
1400 }
1401
1402 static enum sp_return set_flow(int fd, struct port_data *data)
1403 {
1404         void *termx;
1405
1406         TRACE("%d, %p", fd, data);
1407
1408         DEBUG("Getting advanced flow control");
1409
1410         if (!(termx = malloc(get_termiox_size())))
1411                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1412
1413         if (ioctl(fd, TCGETX, termx) < 0) {
1414                 free(termx);
1415                 RETURN_FAIL("Getting termiox failed");
1416         }
1417
1418         DEBUG("Setting advanced flow control");
1419
1420         set_termiox_flow(termx, data->rts_flow, data->cts_flow,
1421                         data->dtr_flow, data->dsr_flow);
1422
1423         if (ioctl(fd, TCSETX, termx) < 0) {
1424                 free(termx);
1425                 RETURN_FAIL("Setting termiox failed");
1426         }
1427
1428         free(termx);
1429
1430         RETURN_OK();
1431 }
1432 #endif /* USE_TERMIOX */
1433
1434 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
1435         struct sp_port_config *config)
1436 {
1437         unsigned int i;
1438
1439         TRACE("%p, %p, %p", port, data, config);
1440
1441         DEBUG_FMT("Getting configuration for port %s", port->name);
1442
1443 #ifdef _WIN32
1444         if (!GetCommState(port->hdl, &data->dcb))
1445                 RETURN_FAIL("GetCommState() failed");
1446
1447         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1448                 if (data->dcb.BaudRate == std_baudrates[i].index) {
1449                         config->baudrate = std_baudrates[i].value;
1450                         break;
1451                 }
1452         }
1453
1454         if (i == NUM_STD_BAUDRATES)
1455                 /* BaudRate field can be either an index or a custom baud rate. */
1456                 config->baudrate = data->dcb.BaudRate;
1457
1458         config->bits = data->dcb.ByteSize;
1459
1460         if (data->dcb.fParity)
1461                 switch (data->dcb.Parity) {
1462                 case NOPARITY:
1463                         config->parity = SP_PARITY_NONE;
1464                         break;
1465                 case ODDPARITY:
1466                         config->parity = SP_PARITY_ODD;
1467                         break;
1468                 case EVENPARITY:
1469                         config->parity = SP_PARITY_EVEN;
1470                         break;
1471                 case MARKPARITY:
1472                         config->parity = SP_PARITY_MARK;
1473                         break;
1474                 case SPACEPARITY:
1475                         config->parity = SP_PARITY_SPACE;
1476                         break;
1477                 default:
1478                         config->parity = -1;
1479                 }
1480         else
1481                 config->parity = SP_PARITY_NONE;
1482
1483         switch (data->dcb.StopBits) {
1484         case ONESTOPBIT:
1485                 config->stopbits = 1;
1486                 break;
1487         case TWOSTOPBITS:
1488                 config->stopbits = 2;
1489                 break;
1490         default:
1491                 config->stopbits = -1;
1492         }
1493
1494         switch (data->dcb.fRtsControl) {
1495         case RTS_CONTROL_DISABLE:
1496                 config->rts = SP_RTS_OFF;
1497                 break;
1498         case RTS_CONTROL_ENABLE:
1499                 config->rts = SP_RTS_ON;
1500                 break;
1501         case RTS_CONTROL_HANDSHAKE:
1502                 config->rts = SP_RTS_FLOW_CONTROL;
1503                 break;
1504         default:
1505                 config->rts = -1;
1506         }
1507
1508         config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1509
1510         switch (data->dcb.fDtrControl) {
1511         case DTR_CONTROL_DISABLE:
1512                 config->dtr = SP_DTR_OFF;
1513                 break;
1514         case DTR_CONTROL_ENABLE:
1515                 config->dtr = SP_DTR_ON;
1516                 break;
1517         case DTR_CONTROL_HANDSHAKE:
1518                 config->dtr = SP_DTR_FLOW_CONTROL;
1519                 break;
1520         default:
1521                 config->dtr = -1;
1522         }
1523
1524         config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1525
1526         if (data->dcb.fInX) {
1527                 if (data->dcb.fOutX)
1528                         config->xon_xoff = SP_XONXOFF_INOUT;
1529                 else
1530                         config->xon_xoff = SP_XONXOFF_IN;
1531         } else {
1532                 if (data->dcb.fOutX)
1533                         config->xon_xoff = SP_XONXOFF_OUT;
1534                 else
1535                         config->xon_xoff = SP_XONXOFF_DISABLED;
1536         }
1537
1538 #else // !_WIN32
1539
1540         if (tcgetattr(port->fd, &data->term) < 0)
1541                 RETURN_FAIL("tcgetattr() failed");
1542
1543         if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
1544                 RETURN_FAIL("TIOCMGET ioctl failed");
1545
1546 #ifdef USE_TERMIOX
1547         int ret = get_flow(port->fd, data);
1548
1549         if (ret == SP_ERR_FAIL && errno == EINVAL)
1550                 data->termiox_supported = 0;
1551         else if (ret < 0)
1552                 RETURN_CODEVAL(ret);
1553         else
1554                 data->termiox_supported = 1;
1555 #else
1556         data->termiox_supported = 0;
1557 #endif
1558
1559         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1560                 if (cfgetispeed(&data->term) == std_baudrates[i].index) {
1561                         config->baudrate = std_baudrates[i].value;
1562                         break;
1563                 }
1564         }
1565
1566         if (i == NUM_STD_BAUDRATES) {
1567 #ifdef __APPLE__
1568                 config->baudrate = (int)data->term.c_ispeed;
1569 #elif defined(USE_TERMIOS_SPEED)
1570                 TRY(get_baudrate(port->fd, &config->baudrate));
1571 #else
1572                 config->baudrate = -1;
1573 #endif
1574         }
1575
1576         switch (data->term.c_cflag & CSIZE) {
1577         case CS8:
1578                 config->bits = 8;
1579                 break;
1580         case CS7:
1581                 config->bits = 7;
1582                 break;
1583         case CS6:
1584                 config->bits = 6;
1585                 break;
1586         case CS5:
1587                 config->bits = 5;
1588                 break;
1589         default:
1590                 config->bits = -1;
1591         }
1592
1593         if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
1594                 config->parity = SP_PARITY_NONE;
1595         else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
1596                 config->parity = -1;
1597 #ifdef CMSPAR
1598         else if (data->term.c_cflag & CMSPAR)
1599                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_MARK : SP_PARITY_SPACE;
1600 #endif
1601         else
1602                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
1603
1604         config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
1605
1606         if (data->term.c_cflag & CRTSCTS) {
1607                 config->rts = SP_RTS_FLOW_CONTROL;
1608                 config->cts = SP_CTS_FLOW_CONTROL;
1609         } else {
1610                 if (data->termiox_supported && data->rts_flow)
1611                         config->rts = SP_RTS_FLOW_CONTROL;
1612                 else
1613                         config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
1614
1615                 config->cts = (data->termiox_supported && data->cts_flow) ?
1616                         SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1617         }
1618
1619         if (data->termiox_supported && data->dtr_flow)
1620                 config->dtr = SP_DTR_FLOW_CONTROL;
1621         else
1622                 config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
1623
1624         config->dsr = (data->termiox_supported && data->dsr_flow) ?
1625                 SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1626
1627         if (data->term.c_iflag & IXOFF) {
1628                 if (data->term.c_iflag & IXON)
1629                         config->xon_xoff = SP_XONXOFF_INOUT;
1630                 else
1631                         config->xon_xoff = SP_XONXOFF_IN;
1632         } else {
1633                 if (data->term.c_iflag & IXON)
1634                         config->xon_xoff = SP_XONXOFF_OUT;
1635                 else
1636                         config->xon_xoff = SP_XONXOFF_DISABLED;
1637         }
1638 #endif
1639
1640         RETURN_OK();
1641 }
1642
1643 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
1644         const struct sp_port_config *config)
1645 {
1646         unsigned int i;
1647 #ifdef __APPLE__
1648         BAUD_TYPE baud_nonstd;
1649
1650         baud_nonstd = B0;
1651 #endif
1652 #ifdef USE_TERMIOS_SPEED
1653         int baud_nonstd = 0;
1654 #endif
1655
1656         TRACE("%p, %p, %p", port, data, config);
1657
1658         DEBUG_FMT("Setting configuration for port %s", port->name);
1659
1660 #ifdef _WIN32
1661         if (config->baudrate >= 0) {
1662                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1663                         if (config->baudrate == std_baudrates[i].value) {
1664                                 data->dcb.BaudRate = std_baudrates[i].index;
1665                                 break;
1666                         }
1667                 }
1668
1669                 if (i == NUM_STD_BAUDRATES)
1670                         data->dcb.BaudRate = config->baudrate;
1671         }
1672
1673         if (config->bits >= 0)
1674                 data->dcb.ByteSize = config->bits;
1675
1676         if (config->parity >= 0) {
1677                 switch (config->parity) {
1678                 case SP_PARITY_NONE:
1679                         data->dcb.Parity = NOPARITY;
1680                         break;
1681                 case SP_PARITY_ODD:
1682                         data->dcb.Parity = ODDPARITY;
1683                         break;
1684                 case SP_PARITY_EVEN:
1685                         data->dcb.Parity = EVENPARITY;
1686                         break;
1687                 case SP_PARITY_MARK:
1688                         data->dcb.Parity = MARKPARITY;
1689                         break;
1690                 case SP_PARITY_SPACE:
1691                         data->dcb.Parity = SPACEPARITY;
1692                         break;
1693                 default:
1694                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1695                 }
1696         }
1697
1698         if (config->stopbits >= 0) {
1699                 switch (config->stopbits) {
1700                 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
1701                 case 1:
1702                         data->dcb.StopBits = ONESTOPBIT;
1703                         break;
1704                 case 2:
1705                         data->dcb.StopBits = TWOSTOPBITS;
1706                         break;
1707                 default:
1708                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bit setting");
1709                 }
1710         }
1711
1712         if (config->rts >= 0) {
1713                 switch (config->rts) {
1714                 case SP_RTS_OFF:
1715                         data->dcb.fRtsControl = RTS_CONTROL_DISABLE;
1716                         break;
1717                 case SP_RTS_ON:
1718                         data->dcb.fRtsControl = RTS_CONTROL_ENABLE;
1719                         break;
1720                 case SP_RTS_FLOW_CONTROL:
1721                         data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
1722                         break;
1723                 default:
1724                         RETURN_ERROR(SP_ERR_ARG, "Invalid RTS setting");
1725                 }
1726         }
1727
1728         if (config->cts >= 0) {
1729                 switch (config->cts) {
1730                 case SP_CTS_IGNORE:
1731                         data->dcb.fOutxCtsFlow = FALSE;
1732                         break;
1733                 case SP_CTS_FLOW_CONTROL:
1734                         data->dcb.fOutxCtsFlow = TRUE;
1735                         break;
1736                 default:
1737                         RETURN_ERROR(SP_ERR_ARG, "Invalid CTS setting");
1738                 }
1739         }
1740
1741         if (config->dtr >= 0) {
1742                 switch (config->dtr) {
1743                 case SP_DTR_OFF:
1744                         data->dcb.fDtrControl = DTR_CONTROL_DISABLE;
1745                         break;
1746                 case SP_DTR_ON:
1747                         data->dcb.fDtrControl = DTR_CONTROL_ENABLE;
1748                         break;
1749                 case SP_DTR_FLOW_CONTROL:
1750                         data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
1751                         break;
1752                 default:
1753                         RETURN_ERROR(SP_ERR_ARG, "Invalid DTR setting");
1754                 }
1755         }
1756
1757         if (config->dsr >= 0) {
1758                 switch (config->dsr) {
1759                 case SP_DSR_IGNORE:
1760                         data->dcb.fOutxDsrFlow = FALSE;
1761                         break;
1762                 case SP_DSR_FLOW_CONTROL:
1763                         data->dcb.fOutxDsrFlow = TRUE;
1764                         break;
1765                 default:
1766                         RETURN_ERROR(SP_ERR_ARG, "Invalid DSR setting");
1767                 }
1768         }
1769
1770         if (config->xon_xoff >= 0) {
1771                 switch (config->xon_xoff) {
1772                 case SP_XONXOFF_DISABLED:
1773                         data->dcb.fInX = FALSE;
1774                         data->dcb.fOutX = FALSE;
1775                         break;
1776                 case SP_XONXOFF_IN:
1777                         data->dcb.fInX = TRUE;
1778                         data->dcb.fOutX = FALSE;
1779                         break;
1780                 case SP_XONXOFF_OUT:
1781                         data->dcb.fInX = FALSE;
1782                         data->dcb.fOutX = TRUE;
1783                         break;
1784                 case SP_XONXOFF_INOUT:
1785                         data->dcb.fInX = TRUE;
1786                         data->dcb.fOutX = TRUE;
1787                         break;
1788                 default:
1789                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1790                 }
1791         }
1792
1793         if (!SetCommState(port->hdl, &data->dcb))
1794                 RETURN_FAIL("SetCommState() failed");
1795
1796 #else /* !_WIN32 */
1797
1798         int controlbits;
1799
1800         if (config->baudrate >= 0) {
1801                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1802                         if (config->baudrate == std_baudrates[i].value) {
1803                                 if (cfsetospeed(&data->term, std_baudrates[i].index) < 0)
1804                                         RETURN_FAIL("cfsetospeed() failed");
1805
1806                                 if (cfsetispeed(&data->term, std_baudrates[i].index) < 0)
1807                                         RETURN_FAIL("cfsetispeed() failed");
1808                                 break;
1809                         }
1810                 }
1811
1812                 /* Non-standard baud rate */
1813                 if (i == NUM_STD_BAUDRATES) {
1814 #ifdef __APPLE__
1815                         /* Set "dummy" baud rate. */
1816                         if (cfsetspeed(&data->term, B9600) < 0)
1817                                 RETURN_FAIL("cfsetspeed() failed");
1818                         baud_nonstd = config->baudrate;
1819 #elif defined(USE_TERMIOS_SPEED)
1820                         baud_nonstd = 1;
1821 #else
1822                         RETURN_ERROR(SP_ERR_SUPP, "Non-standard baudrate not supported");
1823 #endif
1824                 }
1825         }
1826
1827         if (config->bits >= 0) {
1828                 data->term.c_cflag &= ~CSIZE;
1829                 switch (config->bits) {
1830                 case 8:
1831                         data->term.c_cflag |= CS8;
1832                         break;
1833                 case 7:
1834                         data->term.c_cflag |= CS7;
1835                         break;
1836                 case 6:
1837                         data->term.c_cflag |= CS6;
1838                         break;
1839                 case 5:
1840                         data->term.c_cflag |= CS5;
1841                         break;
1842                 default:
1843                         RETURN_ERROR(SP_ERR_ARG, "Invalid data bits setting");
1844                 }
1845         }
1846
1847         if (config->parity >= 0) {
1848                 data->term.c_iflag &= ~IGNPAR;
1849                 data->term.c_cflag &= ~(PARENB | PARODD);
1850 #ifdef CMSPAR
1851                 data->term.c_cflag &= ~CMSPAR;
1852 #endif
1853                 switch (config->parity) {
1854                 case SP_PARITY_NONE:
1855                         data->term.c_iflag |= IGNPAR;
1856                         break;
1857                 case SP_PARITY_EVEN:
1858                         data->term.c_cflag |= PARENB;
1859                         break;
1860                 case SP_PARITY_ODD:
1861                         data->term.c_cflag |= PARENB | PARODD;
1862                         break;
1863 #ifdef CMSPAR
1864                 case SP_PARITY_MARK:
1865                         data->term.c_cflag |= PARENB | PARODD;
1866                         data->term.c_cflag |= CMSPAR;
1867                         break;
1868                 case SP_PARITY_SPACE:
1869                         data->term.c_cflag |= PARENB;
1870                         data->term.c_cflag |= CMSPAR;
1871                         break;
1872 #else
1873                 case SP_PARITY_MARK:
1874                 case SP_PARITY_SPACE:
1875                         RETURN_ERROR(SP_ERR_SUPP, "Mark/space parity not supported");
1876 #endif
1877                 default:
1878                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1879                 }
1880         }
1881
1882         if (config->stopbits >= 0) {
1883                 data->term.c_cflag &= ~CSTOPB;
1884                 switch (config->stopbits) {
1885                 case 1:
1886                         data->term.c_cflag &= ~CSTOPB;
1887                         break;
1888                 case 2:
1889                         data->term.c_cflag |= CSTOPB;
1890                         break;
1891                 default:
1892                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bits setting");
1893                 }
1894         }
1895
1896         if (config->rts >= 0 || config->cts >= 0) {
1897                 if (data->termiox_supported) {
1898                         data->rts_flow = data->cts_flow = 0;
1899                         switch (config->rts) {
1900                         case SP_RTS_OFF:
1901                         case SP_RTS_ON:
1902                                 controlbits = TIOCM_RTS;
1903                                 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
1904                                         RETURN_FAIL("Setting RTS signal level failed");
1905                                 break;
1906                         case SP_RTS_FLOW_CONTROL:
1907                                 data->rts_flow = 1;
1908                                 break;
1909                         default:
1910                                 break;
1911                         }
1912                         if (config->cts == SP_CTS_FLOW_CONTROL)
1913                                 data->cts_flow = 1;
1914
1915                         if (data->rts_flow && data->cts_flow)
1916                                 data->term.c_iflag |= CRTSCTS;
1917                         else
1918                                 data->term.c_iflag &= ~CRTSCTS;
1919                 } else {
1920                         /* Asymmetric use of RTS/CTS not supported. */
1921                         if (data->term.c_iflag & CRTSCTS) {
1922                                 /* Flow control can only be disabled for both RTS & CTS together. */
1923                                 if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
1924                                         if (config->cts != SP_CTS_IGNORE)
1925                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
1926                                 }
1927                                 if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
1928                                         if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
1929                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
1930                                 }
1931                         } else {
1932                                 /* Flow control can only be enabled for both RTS & CTS together. */
1933                                 if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
1934                                         ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
1935                                         RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be enabled together");
1936                         }
1937
1938                         if (config->rts >= 0) {
1939                                 if (config->rts == SP_RTS_FLOW_CONTROL) {
1940                                         data->term.c_iflag |= CRTSCTS;
1941                                 } else {
1942                                         controlbits = TIOCM_RTS;
1943                                         if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
1944                                                         &controlbits) < 0)
1945                                                 RETURN_FAIL("Setting RTS signal level failed");
1946                                 }
1947                         }
1948                 }
1949         }
1950
1951         if (config->dtr >= 0 || config->dsr >= 0) {
1952                 if (data->termiox_supported) {
1953                         data->dtr_flow = data->dsr_flow = 0;
1954                         switch (config->dtr) {
1955                         case SP_DTR_OFF:
1956                         case SP_DTR_ON:
1957                                 controlbits = TIOCM_DTR;
1958                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
1959                                         RETURN_FAIL("Setting DTR signal level failed");
1960                                 break;
1961                         case SP_DTR_FLOW_CONTROL:
1962                                 data->dtr_flow = 1;
1963                                 break;
1964                         default:
1965                                 break;
1966                         }
1967                         if (config->dsr == SP_DSR_FLOW_CONTROL)
1968                                 data->dsr_flow = 1;
1969                 } else {
1970                         /* DTR/DSR flow control not supported. */
1971                         if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
1972                                 RETURN_ERROR(SP_ERR_SUPP, "DTR/DSR flow control not supported");
1973
1974                         if (config->dtr >= 0) {
1975                                 controlbits = TIOCM_DTR;
1976                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
1977                                                 &controlbits) < 0)
1978                                         RETURN_FAIL("Setting DTR signal level failed");
1979                         }
1980                 }
1981         }
1982
1983         if (config->xon_xoff >= 0) {
1984                 data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
1985                 switch (config->xon_xoff) {
1986                 case SP_XONXOFF_DISABLED:
1987                         break;
1988                 case SP_XONXOFF_IN:
1989                         data->term.c_iflag |= IXOFF;
1990                         break;
1991                 case SP_XONXOFF_OUT:
1992                         data->term.c_iflag |= IXON | IXANY;
1993                         break;
1994                 case SP_XONXOFF_INOUT:
1995                         data->term.c_iflag |= IXON | IXOFF | IXANY;
1996                         break;
1997                 default:
1998                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1999                 }
2000         }
2001
2002         if (tcsetattr(port->fd, TCSANOW, &data->term) < 0)
2003                 RETURN_FAIL("tcsetattr() failed");
2004
2005 #ifdef __APPLE__
2006         if (baud_nonstd != B0) {
2007                 if (ioctl(port->fd, IOSSIOSPEED, &baud_nonstd) == -1)
2008                         RETURN_FAIL("IOSSIOSPEED ioctl failed");
2009                 /*
2010                  * Set baud rates in data->term to correct, but incompatible
2011                  * with tcsetattr() value, same as delivered by tcgetattr().
2012                  */
2013                 if (cfsetspeed(&data->term, baud_nonstd) < 0)
2014                         RETURN_FAIL("cfsetspeed() failed");
2015         }
2016 #elif defined(__linux__)
2017 #ifdef USE_TERMIOS_SPEED
2018         if (baud_nonstd)
2019                 TRY(set_baudrate(port->fd, config->baudrate));
2020 #endif
2021 #ifdef USE_TERMIOX
2022         if (data->termiox_supported)
2023                 TRY(set_flow(port->fd, data));
2024 #endif
2025 #endif
2026
2027 #endif /* !_WIN32 */
2028
2029         RETURN_OK();
2030 }
2031
2032 SP_API enum sp_return sp_new_config(struct sp_port_config **config_ptr)
2033 {
2034         struct sp_port_config *config;
2035
2036         TRACE("%p", config_ptr);
2037
2038         if (!config_ptr)
2039                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2040
2041         *config_ptr = NULL;
2042
2043         if (!(config = malloc(sizeof(struct sp_port_config))))
2044                 RETURN_ERROR(SP_ERR_MEM, "Config malloc failed");
2045
2046         config->baudrate = -1;
2047         config->bits = -1;
2048         config->parity = -1;
2049         config->stopbits = -1;
2050         config->rts = -1;
2051         config->cts = -1;
2052         config->dtr = -1;
2053         config->dsr = -1;
2054
2055         *config_ptr = config;
2056
2057         RETURN_OK();
2058 }
2059
2060 SP_API void sp_free_config(struct sp_port_config *config)
2061 {
2062         TRACE("%p", config);
2063
2064         if (!config)
2065                 DEBUG("Null config");
2066         else
2067                 free(config);
2068
2069         RETURN();
2070 }
2071
2072 SP_API enum sp_return sp_get_config(struct sp_port *port,
2073                                     struct sp_port_config *config)
2074 {
2075         struct port_data data;
2076
2077         TRACE("%p, %p", port, config);
2078
2079         CHECK_OPEN_PORT();
2080
2081         if (!config)
2082                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2083
2084         TRY(get_config(port, &data, config));
2085
2086         RETURN_OK();
2087 }
2088
2089 SP_API enum sp_return sp_set_config(struct sp_port *port,
2090                                     const struct sp_port_config *config)
2091 {
2092         struct port_data data;
2093         struct sp_port_config prev_config;
2094
2095         TRACE("%p, %p", port, config);
2096
2097         CHECK_OPEN_PORT();
2098
2099         if (!config)
2100                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2101
2102         TRY(get_config(port, &data, &prev_config));
2103         TRY(set_config(port, &data, config));
2104
2105         RETURN_OK();
2106 }
2107
2108 #define CREATE_ACCESSORS(x, type) \
2109 SP_API enum sp_return sp_set_##x(struct sp_port *port, type x) { \
2110         struct port_data data; \
2111         struct sp_port_config config; \
2112         TRACE("%p, %d", port, x); \
2113         CHECK_OPEN_PORT(); \
2114         TRY(get_config(port, &data, &config)); \
2115         config.x = x; \
2116         TRY(set_config(port, &data, &config)); \
2117         RETURN_OK(); \
2118 } \
2119 SP_API enum sp_return sp_get_config_##x(const struct sp_port_config *config, \
2120                                         type *x) { \
2121         TRACE("%p, %p", config, x); \
2122         if (!x) \
2123                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer"); \
2124         if (!config) \
2125                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2126         *x = config->x; \
2127         RETURN_OK(); \
2128 } \
2129 SP_API enum sp_return sp_set_config_##x(struct sp_port_config *config, \
2130                                         type x) { \
2131         TRACE("%p, %d", config, x); \
2132         if (!config) \
2133                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2134         config->x = x; \
2135         RETURN_OK(); \
2136 }
2137
2138 CREATE_ACCESSORS(baudrate, int)
2139 CREATE_ACCESSORS(bits, int)
2140 CREATE_ACCESSORS(parity, enum sp_parity)
2141 CREATE_ACCESSORS(stopbits, int)
2142 CREATE_ACCESSORS(rts, enum sp_rts)
2143 CREATE_ACCESSORS(cts, enum sp_cts)
2144 CREATE_ACCESSORS(dtr, enum sp_dtr)
2145 CREATE_ACCESSORS(dsr, enum sp_dsr)
2146 CREATE_ACCESSORS(xon_xoff, enum sp_xonxoff)
2147
2148 SP_API enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config,
2149                                                 enum sp_flowcontrol flowcontrol)
2150 {
2151         if (!config)
2152                 RETURN_ERROR(SP_ERR_ARG, "Null configuration");
2153
2154         if (flowcontrol > SP_FLOWCONTROL_DTRDSR)
2155                 RETURN_ERROR(SP_ERR_ARG, "Invalid flow control setting");
2156
2157         if (flowcontrol == SP_FLOWCONTROL_XONXOFF)
2158                 config->xon_xoff = SP_XONXOFF_INOUT;
2159         else
2160                 config->xon_xoff = SP_XONXOFF_DISABLED;
2161
2162         if (flowcontrol == SP_FLOWCONTROL_RTSCTS) {
2163                 config->rts = SP_RTS_FLOW_CONTROL;
2164                 config->cts = SP_CTS_FLOW_CONTROL;
2165         } else {
2166                 if (config->rts == SP_RTS_FLOW_CONTROL)
2167                         config->rts = SP_RTS_ON;
2168                 config->cts = SP_CTS_IGNORE;
2169         }
2170
2171         if (flowcontrol == SP_FLOWCONTROL_DTRDSR) {
2172                 config->dtr = SP_DTR_FLOW_CONTROL;
2173                 config->dsr = SP_DSR_FLOW_CONTROL;
2174         } else {
2175                 if (config->dtr == SP_DTR_FLOW_CONTROL)
2176                         config->dtr = SP_DTR_ON;
2177                 config->dsr = SP_DSR_IGNORE;
2178         }
2179
2180         RETURN_OK();
2181 }
2182
2183 SP_API enum sp_return sp_set_flowcontrol(struct sp_port *port,
2184                                          enum sp_flowcontrol flowcontrol)
2185 {
2186         struct port_data data;
2187         struct sp_port_config config;
2188
2189         TRACE("%p, %d", port, flowcontrol);
2190
2191         CHECK_OPEN_PORT();
2192
2193         TRY(get_config(port, &data, &config));
2194
2195         TRY(sp_set_config_flowcontrol(&config, flowcontrol));
2196
2197         TRY(set_config(port, &data, &config));
2198
2199         RETURN_OK();
2200 }
2201
2202 SP_API enum sp_return sp_get_signals(struct sp_port *port,
2203                                      enum sp_signal *signals)
2204 {
2205         TRACE("%p, %p", port, signals);
2206
2207         CHECK_OPEN_PORT();
2208
2209         if (!signals)
2210                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2211
2212         DEBUG_FMT("Getting control signals for port %s", port->name);
2213
2214         *signals = 0;
2215 #ifdef _WIN32
2216         DWORD bits;
2217         if (GetCommModemStatus(port->hdl, &bits) == 0)
2218                 RETURN_FAIL("GetCommModemStatus() failed");
2219         if (bits & MS_CTS_ON)
2220                 *signals |= SP_SIG_CTS;
2221         if (bits & MS_DSR_ON)
2222                 *signals |= SP_SIG_DSR;
2223         if (bits & MS_RLSD_ON)
2224                 *signals |= SP_SIG_DCD;
2225         if (bits & MS_RING_ON)
2226                 *signals |= SP_SIG_RI;
2227 #else
2228         int bits;
2229         if (ioctl(port->fd, TIOCMGET, &bits) < 0)
2230                 RETURN_FAIL("TIOCMGET ioctl failed");
2231         if (bits & TIOCM_CTS)
2232                 *signals |= SP_SIG_CTS;
2233         if (bits & TIOCM_DSR)
2234                 *signals |= SP_SIG_DSR;
2235         if (bits & TIOCM_CAR)
2236                 *signals |= SP_SIG_DCD;
2237         if (bits & TIOCM_RNG)
2238                 *signals |= SP_SIG_RI;
2239 #endif
2240         RETURN_OK();
2241 }
2242
2243 SP_API enum sp_return sp_start_break(struct sp_port *port)
2244 {
2245         TRACE("%p", port);
2246
2247         CHECK_OPEN_PORT();
2248 #ifdef _WIN32
2249         if (SetCommBreak(port->hdl) == 0)
2250                 RETURN_FAIL("SetCommBreak() failed");
2251 #else
2252         if (ioctl(port->fd, TIOCSBRK, 1) < 0)
2253                 RETURN_FAIL("TIOCSBRK ioctl failed");
2254 #endif
2255
2256         RETURN_OK();
2257 }
2258
2259 SP_API enum sp_return sp_end_break(struct sp_port *port)
2260 {
2261         TRACE("%p", port);
2262
2263         CHECK_OPEN_PORT();
2264 #ifdef _WIN32
2265         if (ClearCommBreak(port->hdl) == 0)
2266                 RETURN_FAIL("ClearCommBreak() failed");
2267 #else
2268         if (ioctl(port->fd, TIOCCBRK, 1) < 0)
2269                 RETURN_FAIL("TIOCCBRK ioctl failed");
2270 #endif
2271
2272         RETURN_OK();
2273 }
2274
2275 SP_API int sp_last_error_code(void)
2276 {
2277         TRACE_VOID();
2278 #ifdef _WIN32
2279         RETURN_INT(GetLastError());
2280 #else
2281         RETURN_INT(errno);
2282 #endif
2283 }
2284
2285 SP_API char *sp_last_error_message(void)
2286 {
2287         TRACE_VOID();
2288
2289 #ifdef _WIN32
2290         LPVOID message;
2291         DWORD error = GetLastError();
2292
2293         FormatMessage(
2294                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
2295                 FORMAT_MESSAGE_FROM_SYSTEM |
2296                 FORMAT_MESSAGE_IGNORE_INSERTS,
2297                 NULL,
2298                 error,
2299                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
2300                 (LPTSTR) &message,
2301                 0, NULL );
2302
2303         RETURN_STRING(message);
2304 #else
2305         RETURN_STRING(strerror(errno));
2306 #endif
2307 }
2308
2309 SP_API void sp_free_error_message(char *message)
2310 {
2311         TRACE("%s", message);
2312
2313 #ifdef _WIN32
2314         LocalFree(message);
2315 #else
2316         (void)message;
2317 #endif
2318
2319         RETURN();
2320 }
2321
2322 SP_API void sp_set_debug_handler(void (*handler)(const char *format, ...))
2323 {
2324         TRACE("%p", handler);
2325
2326         sp_debug_handler = handler;
2327
2328         RETURN();
2329 }
2330
2331 SP_API void sp_default_debug_handler(const char *format, ...)
2332 {
2333         va_list args;
2334         va_start(args, format);
2335         if (getenv("LIBSERIALPORT_DEBUG")) {
2336                 fputs("sp: ", stderr);
2337                 vfprintf(stderr, format, args);
2338         }
2339         va_end(args);
2340 }
2341
2342 SP_API int sp_get_major_package_version(void)
2343 {
2344         return SP_PACKAGE_VERSION_MAJOR;
2345 }
2346
2347 SP_API int sp_get_minor_package_version(void)
2348 {
2349         return SP_PACKAGE_VERSION_MINOR;
2350 }
2351
2352 SP_API int sp_get_micro_package_version(void)
2353 {
2354         return SP_PACKAGE_VERSION_MICRO;
2355 }
2356
2357 SP_API const char *sp_get_package_version_string(void)
2358 {
2359         return SP_PACKAGE_VERSION_STRING;
2360 }
2361
2362 SP_API int sp_get_current_lib_version(void)
2363 {
2364         return SP_LIB_VERSION_CURRENT;
2365 }
2366
2367 SP_API int sp_get_revision_lib_version(void)
2368 {
2369         return SP_LIB_VERSION_REVISION;
2370 }
2371
2372 SP_API int sp_get_age_lib_version(void)
2373 {
2374         return SP_LIB_VERSION_AGE;
2375 }
2376
2377 SP_API const char *sp_get_lib_version_string(void)
2378 {
2379         return SP_LIB_VERSION_STRING;
2380 }
2381
2382 /** @} */