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         if (port->timeouts.WriteTotalTimeoutConstant != timeout_ms) {
 755                 port->timeouts.WriteTotalTimeoutConstant = timeout_ms;
 756                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 757                         RETURN_FAIL("SetCommTimeouts() failed");
 758         }
 759
 760         /* Start write. */
 761         if (WriteFile(port->hdl, buf, count, NULL, &port->write_ovl)) {
 762                 DEBUG("Write completed immediately");
 763                 RETURN_INT(count);
 764         } else if (GetLastError() == ERROR_IO_PENDING) {
 765                 DEBUG("Waiting for write to complete");
 766                 if (GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE) == 0)
 767                         RETURN_FAIL("GetOverlappedResult() failed");
 768                 DEBUG_FMT("Write completed, %d/%d bytes written", bytes_written, count);
 769                 RETURN_INT(bytes_written);
 770         } else {
 771                 RETURN_FAIL("WriteFile() failed");
 772         }
 773 #else
 774         size_t bytes_written = 0;
 775         unsigned char *ptr = (unsigned char *) buf;
 776         struct timeval start, delta, now, end = {0, 0};
 777         fd_set fds;
 778         int result;
 779
 780         if (timeout_ms) {
 781                 /* Get time at start of operation. */
 782                 gettimeofday(&start, NULL);
 783                 /* Define duration of timeout. */
 784                 delta.tv_sec = timeout_ms / 1000;
 785                 delta.tv_usec = (timeout_ms % 1000) * 1000;
 786                 /* Calculate time at which we should give up. */
 787                 timeradd(&start, &delta, &end);
 788         }
 789
 790         FD_ZERO(&fds);
 791         FD_SET(port->fd, &fds);
 792
 793         /* Loop until we have written the requested number of bytes. */
 794         while (bytes_written < count) {
 795                 /* Wait until space is available. */
 796                 if (timeout_ms) {
 797                         gettimeofday(&now, NULL);
 798                         if (timercmp(&now, &end, >)) {
 799                                 DEBUG("Write timed out");
 800                                 RETURN_INT(bytes_written);
 801                         }
 802                         timersub(&end, &now, &delta);
 803                 }
 804                 result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &delta : NULL);
 805                 if (result < 0) {
 806                         if (errno == EINTR) {
 807                                 DEBUG("select() call was interrupted, repeating");
 808                                 continue;
 809                         } else {
 810                                 RETURN_FAIL("select() failed");
 811                         }
 812                 } else if (result == 0) {
 813                         DEBUG("Write timed out");
 814                         RETURN_INT(bytes_written);
 815                 }
 816
 817                 /* Do write. */
 818                 result = write(port->fd, ptr, count - bytes_written);
 819
 820                 if (result < 0) {
 821                         if (errno == EAGAIN)
 822                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
 823                                 continue;
 824                         else
 825                                 /* This is an actual failure. */
 826                                 RETURN_FAIL("write() failed");
 827                 }
 828
 829                 bytes_written += result;
 830                 ptr += result;
 831         }
 832
 833         RETURN_INT(bytes_written);
 834 #endif
 835 }
 836
 837 SP_API enum sp_return sp_nonblocking_write(struct sp_port *port,
 838                                            const void *buf, size_t count)
 839 {
 840         TRACE("%p, %p, %d", port, buf, count);
 841
 842         CHECK_OPEN_PORT();
 843
 844         if (!buf)
 845                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 846
 847         DEBUG_FMT("Writing up to %d bytes to port %s", count, port->name);
 848
 849         if (count == 0)
 850                 RETURN_INT(0);
 851
 852 #ifdef _WIN32
 853         DWORD written = 0;
 854         BYTE *ptr = (BYTE *) buf;
 855
 856         /* Check whether previous write is complete. */
 857         if (port->writing) {
 858                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 859                         DEBUG("Previous write completed");
 860                         port->writing = 0;
 861                 } else {
 862                         DEBUG("Previous write not complete");
 863                         /* Can't take a new write until the previous one finishes. */
 864                         RETURN_INT(0);
 865                 }
 866         }
 867
 868         /* Set timeout. */
 869         if (port->timeouts.WriteTotalTimeoutConstant != 0) {
 870                 port->timeouts.WriteTotalTimeoutConstant = 0;
 871                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 872                         RETURN_FAIL("SetCommTimeouts() failed");
 873         }
 874
 875         /*
 876          * Keep writing data until the OS has to actually start an async IO
 877          * for it. At that point we know the buffer is full.
 878          */
 879         while (written < count) {
 880                 /* Copy first byte of user buffer. */
 881                 port->pending_byte = *ptr++;
 882
 883                 /* Start asynchronous write. */
 884                 if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
 885                         if (GetLastError() == ERROR_IO_PENDING) {
 886                                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 887                                         DEBUG("Asynchronous write completed immediately");
 888                                         port->writing = 0;
 889                                         written++;
 890                                         continue;
 891                                 } else {
 892                                         DEBUG("Asynchronous write running");
 893                                         port->writing = 1;
 894                                         RETURN_INT(++written);
 895                                 }
 896                         } else {
 897                                 /* Actual failure of some kind. */
 898                                 RETURN_FAIL("WriteFile() failed");
 899                         }
 900                 } else {
 901                         DEBUG("Single byte written immediately");
 902                         written++;
 903                 }
 904         }
 905
 906         DEBUG("All bytes written immediately");
 907
 908         RETURN_INT(written);
 909 #else
 910         /* Returns the number of bytes written, or -1 upon failure. */
 911         ssize_t written = write(port->fd, buf, count);
 912
 913         if (written < 0)
 914                 RETURN_FAIL("write() failed");
 915         else
 916                 RETURN_INT(written);
 917 #endif
 918 }
 919
 920 #ifdef _WIN32
 921 /* Restart wait operation if buffer was emptied. */
 922 static enum sp_return restart_wait_if_needed(struct sp_port *port, unsigned int bytes_read)
 923 {
 924         DWORD errors;
 925         COMSTAT comstat;
 926
 927         if (bytes_read == 0)
 928                 RETURN_OK();
 929
 930         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
 931                 RETURN_FAIL("ClearCommError() failed");
 932
 933         if (comstat.cbInQue == 0)
 934                 TRY(restart_wait(port));
 935
 936         RETURN_OK();
 937 }
 938 #endif
 939
 940 SP_API enum sp_return sp_blocking_read(struct sp_port *port, void *buf,
 941                                        size_t count, unsigned int timeout_ms)
 942 {
 943         TRACE("%p, %p, %d, %d", port, buf, count, timeout_ms);
 944
 945         CHECK_OPEN_PORT();
 946
 947         if (!buf)
 948                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 949
 950         if (timeout_ms)
 951                 DEBUG_FMT("Reading %d bytes from port %s, timeout %d ms",
 952                         count, port->name, timeout_ms);
 953         else
 954                 DEBUG_FMT("Reading %d bytes from port %s, no timeout",
 955                         count, port->name);
 956
 957         if (count == 0)
 958                 RETURN_INT(0);
 959
 960 #ifdef _WIN32
 961         DWORD bytes_read = 0;
 962
 963         /* Set timeout. */
 964         if (port->timeouts.ReadIntervalTimeout != 0 ||
 965                         port->timeouts.ReadTotalTimeoutConstant != timeout_ms) {
 966                 port->timeouts.ReadIntervalTimeout = 0;
 967                 port->timeouts.ReadTotalTimeoutConstant = timeout_ms;
 968                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 969                         RETURN_FAIL("SetCommTimeouts() failed");
 970         }
 971
 972         /* Start read. */
 973         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl)) {
 974                 DEBUG("Read completed immediately");
 975                 bytes_read = count;
 976         } else if (GetLastError() == ERROR_IO_PENDING) {
 977                 DEBUG("Waiting for read to complete");
 978                 if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
 979                         RETURN_FAIL("GetOverlappedResult() failed");
 980                 DEBUG_FMT("Read completed, %d/%d bytes read", bytes_read, count);
 981         } else {
 982                 RETURN_FAIL("ReadFile() failed");
 983         }
 984
 985         TRY(restart_wait_if_needed(port, bytes_read));
 986
 987         RETURN_INT(bytes_read);
 988
 989 #else
 990         size_t bytes_read = 0;
 991         unsigned char *ptr = (unsigned char *) buf;
 992         struct timeval start, delta, now, end = {0, 0};
 993         fd_set fds;
 994         int result;
 995
 996         if (timeout_ms) {
 997                 /* Get time at start of operation. */
 998                 gettimeofday(&start, NULL);
 999                 /* Define duration of timeout. */
1000                 delta.tv_sec = timeout_ms / 1000;
1001                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1002                 /* Calculate time at which we should give up. */
1003                 timeradd(&start, &delta, &end);
1004         }
1005
1006         FD_ZERO(&fds);
1007         FD_SET(port->fd, &fds);
1008
1009         /* Loop until we have the requested number of bytes. */
1010         while (bytes_read < count) {
1011                 /* Wait until data is available. */
1012                 if (timeout_ms) {
1013                         gettimeofday(&now, NULL);
1014                         if (timercmp(&now, &end, >))
1015                                 /* Timeout has expired. */
1016                                 RETURN_INT(bytes_read);
1017                         timersub(&end, &now, &delta);
1018                 }
1019                 result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
1020                 if (result < 0) {
1021                         if (errno == EINTR) {
1022                                 DEBUG("select() call was interrupted, repeating");
1023                                 continue;
1024                         } else {
1025                                 RETURN_FAIL("select() failed");
1026                         }
1027                 } else if (result == 0) {
1028                         DEBUG("Read timed out");
1029                         RETURN_INT(bytes_read);
1030                 }
1031
1032                 /* Do read. */
1033                 result = read(port->fd, ptr, count - bytes_read);
1034
1035                 if (result < 0) {
1036                         if (errno == EAGAIN)
1037                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
1038                                 continue;
1039                         else
1040                                 /* This is an actual failure. */
1041                                 RETURN_FAIL("read() failed");
1042                 }
1043
1044                 bytes_read += result;
1045                 ptr += result;
1046         }
1047
1048         RETURN_INT(bytes_read);
1049 #endif
1050 }
1051
1052 SP_API enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf,
1053                                           size_t count)
1054 {
1055         TRACE("%p, %p, %d", port, buf, count);
1056
1057         CHECK_OPEN_PORT();
1058
1059         if (!buf)
1060                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1061
1062         DEBUG_FMT("Reading up to %d bytes from port %s", count, port->name);
1063
1064 #ifdef _WIN32
1065         DWORD bytes_read;
1066
1067         /* Set timeout. */
1068         if (port->timeouts.ReadIntervalTimeout != MAXDWORD ||
1069                         port->timeouts.ReadTotalTimeoutConstant != 0) {
1070                 port->timeouts.ReadIntervalTimeout = MAXDWORD;
1071                 port->timeouts.ReadTotalTimeoutConstant = 0;
1072                 if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1073                         RETURN_FAIL("SetCommTimeouts() failed");
1074         }
1075
1076         /* Do read. */
1077         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0)
1078                 RETURN_FAIL("ReadFile() failed");
1079
1080         /* Get number of bytes read. */
1081         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1082                 RETURN_FAIL("GetOverlappedResult() failed");
1083
1084         TRY(restart_wait_if_needed(port, bytes_read));
1085
1086         RETURN_INT(bytes_read);
1087 #else
1088         ssize_t bytes_read;
1089
1090         /* Returns the number of bytes read, or -1 upon failure. */
1091         if ((bytes_read = read(port->fd, buf, count)) < 0) {
1092                 if (errno == EAGAIN)
1093                         /* No bytes available. */
1094                         bytes_read = 0;
1095                 else
1096                         /* This is an actual failure. */
1097                         RETURN_FAIL("read() failed");
1098         }
1099         RETURN_INT(bytes_read);
1100 #endif
1101 }
1102
1103 SP_API enum sp_return sp_input_waiting(struct sp_port *port)
1104 {
1105         TRACE("%p", port);
1106
1107         CHECK_OPEN_PORT();
1108
1109         DEBUG_FMT("Checking input bytes waiting on port %s", port->name);
1110
1111 #ifdef _WIN32
1112         DWORD errors;
1113         COMSTAT comstat;
1114
1115         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1116                 RETURN_FAIL("ClearCommError() failed");
1117         RETURN_INT(comstat.cbInQue);
1118 #else
1119         int bytes_waiting;
1120         if (ioctl(port->fd, TIOCINQ, &bytes_waiting) < 0)
1121                 RETURN_FAIL("TIOCINQ ioctl failed");
1122         RETURN_INT(bytes_waiting);
1123 #endif
1124 }
1125
1126 SP_API enum sp_return sp_output_waiting(struct sp_port *port)
1127 {
1128         TRACE("%p", port);
1129
1130         CHECK_OPEN_PORT();
1131
1132         DEBUG_FMT("Checking output bytes waiting on port %s", port->name);
1133
1134 #ifdef _WIN32
1135         DWORD errors;
1136         COMSTAT comstat;
1137
1138         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1139                 RETURN_FAIL("ClearCommError() failed");
1140         RETURN_INT(comstat.cbOutQue);
1141 #else
1142         int bytes_waiting;
1143         if (ioctl(port->fd, TIOCOUTQ, &bytes_waiting) < 0)
1144                 RETURN_FAIL("TIOCOUTQ ioctl failed");
1145         RETURN_INT(bytes_waiting);
1146 #endif
1147 }
1148
1149 SP_API enum sp_return sp_new_event_set(struct sp_event_set **result_ptr)
1150 {
1151         struct sp_event_set *result;
1152
1153         TRACE("%p", result_ptr);
1154
1155         if (!result_ptr)
1156                 RETURN_ERROR(SP_ERR_ARG, "Null result");
1157
1158         *result_ptr = NULL;
1159
1160         if (!(result = malloc(sizeof(struct sp_event_set))))
1161                 RETURN_ERROR(SP_ERR_MEM, "sp_event_set malloc() failed");
1162
1163         memset(result, 0, sizeof(struct sp_event_set));
1164
1165         *result_ptr = result;
1166
1167         RETURN_OK();
1168 }
1169
1170 static enum sp_return add_handle(struct sp_event_set *event_set,
1171                 event_handle handle, enum sp_event mask)
1172 {
1173         void *new_handles;
1174         enum sp_event *new_masks;
1175
1176         TRACE("%p, %d, %d", event_set, handle, mask);
1177
1178         if (!(new_handles = realloc(event_set->handles,
1179                         sizeof(event_handle) * (event_set->count + 1))))
1180                 RETURN_ERROR(SP_ERR_MEM, "Handle array realloc() failed");
1181
1182         event_set->handles = new_handles;
1183
1184         if (!(new_masks = realloc(event_set->masks,
1185                         sizeof(enum sp_event) * (event_set->count + 1))))
1186                 RETURN_ERROR(SP_ERR_MEM, "Mask array realloc() failed");
1187
1188         event_set->masks = new_masks;
1189
1190         ((event_handle *) event_set->handles)[event_set->count] = handle;
1191         event_set->masks[event_set->count] = mask;
1192
1193         event_set->count++;
1194
1195         RETURN_OK();
1196 }
1197
1198 SP_API enum sp_return sp_add_port_events(struct sp_event_set *event_set,
1199         const struct sp_port *port, enum sp_event mask)
1200 {
1201         TRACE("%p, %p, %d", event_set, port, mask);
1202
1203         if (!event_set)
1204                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1205
1206         if (!port)
1207                 RETURN_ERROR(SP_ERR_ARG, "Null port");
1208
1209         if (mask > (SP_EVENT_RX_READY | SP_EVENT_TX_READY | SP_EVENT_ERROR))
1210                 RETURN_ERROR(SP_ERR_ARG, "Invalid event mask");
1211
1212         if (!mask)
1213                 RETURN_OK();
1214
1215 #ifdef _WIN32
1216         enum sp_event handle_mask;
1217         if ((handle_mask = mask & SP_EVENT_TX_READY))
1218                 TRY(add_handle(event_set, port->write_ovl.hEvent, handle_mask));
1219         if ((handle_mask = mask & (SP_EVENT_RX_READY | SP_EVENT_ERROR)))
1220                 TRY(add_handle(event_set, port->wait_ovl.hEvent, handle_mask));
1221 #else
1222         TRY(add_handle(event_set, port->fd, mask));
1223 #endif
1224
1225         RETURN_OK();
1226 }
1227
1228 SP_API void sp_free_event_set(struct sp_event_set *event_set)
1229 {
1230         TRACE("%p", event_set);
1231
1232         if (!event_set) {
1233                 DEBUG("Null event set");
1234                 RETURN();
1235         }
1236
1237         DEBUG("Freeing event set");
1238
1239         if (event_set->handles)
1240                 free(event_set->handles);
1241         if (event_set->masks)
1242                 free(event_set->masks);
1243
1244         free(event_set);
1245
1246         RETURN();
1247 }
1248
1249 SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
1250                               unsigned int timeout_ms)
1251 {
1252         TRACE("%p, %d", event_set, timeout_ms);
1253
1254         if (!event_set)
1255                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1256
1257 #ifdef _WIN32
1258         if (WaitForMultipleObjects(event_set->count, event_set->handles, FALSE,
1259                         timeout_ms ? timeout_ms : INFINITE) == WAIT_FAILED)
1260                 RETURN_FAIL("WaitForMultipleObjects() failed");
1261
1262         RETURN_OK();
1263 #else
1264         struct timeval start, delta, now, end = {0, 0};
1265         int result, timeout_remaining_ms;
1266         struct pollfd *pollfds;
1267         unsigned int i;
1268
1269         if (!(pollfds = malloc(sizeof(struct pollfd) * event_set->count)))
1270                 RETURN_ERROR(SP_ERR_MEM, "pollfds malloc() failed");
1271
1272         for (i = 0; i < event_set->count; i++) {
1273                 pollfds[i].fd = ((int *) event_set->handles)[i];
1274                 pollfds[i].events = 0;
1275                 pollfds[i].revents = 0;
1276                 if (event_set->masks[i] & SP_EVENT_RX_READY)
1277                         pollfds[i].events |= POLLIN;
1278                 if (event_set->masks[i] & SP_EVENT_TX_READY)
1279                         pollfds[i].events |= POLLOUT;
1280                 if (event_set->masks[i] & SP_EVENT_ERROR)
1281                         pollfds[i].events |= POLLERR;
1282         }
1283
1284         if (timeout_ms) {
1285                 /* Get time at start of operation. */
1286                 gettimeofday(&start, NULL);
1287                 /* Define duration of timeout. */
1288                 delta.tv_sec = timeout_ms / 1000;
1289                 delta.tv_usec = (timeout_ms % 1000) * 1000;
1290                 /* Calculate time at which we should give up. */
1291                 timeradd(&start, &delta, &end);
1292         }
1293
1294         /* Loop until an event occurs. */
1295         while (1) {
1296                 if (timeout_ms) {
1297                         gettimeofday(&now, NULL);
1298                         if (timercmp(&now, &end, >)) {
1299                                 DEBUG("Wait timed out");
1300                                 break;
1301                         }
1302                         timersub(&end, &now, &delta);
1303                         timeout_remaining_ms = delta.tv_sec * 1000 + delta.tv_usec / 1000;
1304                 }
1305
1306                 result = poll(pollfds, event_set->count, timeout_ms ? timeout_remaining_ms : -1);
1307
1308                 if (result < 0) {
1309                         if (errno == EINTR) {
1310                                 DEBUG("poll() call was interrupted, repeating");
1311                                 continue;
1312                         } else {
1313                                 free(pollfds);
1314                                 RETURN_FAIL("poll() failed");
1315                         }
1316                 } else if (result == 0) {
1317                         DEBUG("poll() timed out");
1318                         break;
1319                 } else {
1320                         DEBUG("poll() completed");
1321                         break;
1322                 }
1323         }
1324
1325         free(pollfds);
1326         RETURN_OK();
1327 #endif
1328 }
1329
1330 #ifdef USE_TERMIOS_SPEED
1331 static enum sp_return get_baudrate(int fd, int *baudrate)
1332 {
1333         void *data;
1334
1335         TRACE("%d, %p", fd, baudrate);
1336
1337         DEBUG("Getting baud rate");
1338
1339         if (!(data = malloc(get_termios_size())))
1340                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1341
1342         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1343                 free(data);
1344                 RETURN_FAIL("Getting termios failed");
1345         }
1346
1347         *baudrate = get_termios_speed(data);
1348
1349         free(data);
1350
1351         RETURN_OK();
1352 }
1353
1354 static enum sp_return set_baudrate(int fd, int baudrate)
1355 {
1356         void *data;
1357
1358         TRACE("%d, %d", fd, baudrate);
1359
1360         DEBUG("Getting baud rate");
1361
1362         if (!(data = malloc(get_termios_size())))
1363                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1364
1365         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1366                 free(data);
1367                 RETURN_FAIL("Getting termios failed");
1368         }
1369
1370         DEBUG("Setting baud rate");
1371
1372         set_termios_speed(data, baudrate);
1373
1374         if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
1375                 free(data);
1376                 RETURN_FAIL("Setting termios failed");
1377         }
1378
1379         free(data);
1380
1381         RETURN_OK();
1382 }
1383 #endif /* USE_TERMIOS_SPEED */
1384
1385 #ifdef USE_TERMIOX
1386 static enum sp_return get_flow(int fd, struct port_data *data)
1387 {
1388         void *termx;
1389
1390         TRACE("%d, %p", fd, data);
1391
1392         DEBUG("Getting advanced flow control");
1393
1394         if (!(termx = malloc(get_termiox_size())))
1395                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1396
1397         if (ioctl(fd, TCGETX, termx) < 0) {
1398                 free(termx);
1399                 RETURN_FAIL("Getting termiox failed");
1400         }
1401
1402         get_termiox_flow(termx, &data->rts_flow, &data->cts_flow,
1403                         &data->dtr_flow, &data->dsr_flow);
1404
1405         free(termx);
1406
1407         RETURN_OK();
1408 }
1409
1410 static enum sp_return set_flow(int fd, struct port_data *data)
1411 {
1412         void *termx;
1413
1414         TRACE("%d, %p", fd, data);
1415
1416         DEBUG("Getting advanced flow control");
1417
1418         if (!(termx = malloc(get_termiox_size())))
1419                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1420
1421         if (ioctl(fd, TCGETX, termx) < 0) {
1422                 free(termx);
1423                 RETURN_FAIL("Getting termiox failed");
1424         }
1425
1426         DEBUG("Setting advanced flow control");
1427
1428         set_termiox_flow(termx, data->rts_flow, data->cts_flow,
1429                         data->dtr_flow, data->dsr_flow);
1430
1431         if (ioctl(fd, TCSETX, termx) < 0) {
1432                 free(termx);
1433                 RETURN_FAIL("Setting termiox failed");
1434         }
1435
1436         free(termx);
1437
1438         RETURN_OK();
1439 }
1440 #endif /* USE_TERMIOX */
1441
1442 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
1443         struct sp_port_config *config)
1444 {
1445         unsigned int i;
1446
1447         TRACE("%p, %p, %p", port, data, config);
1448
1449         DEBUG_FMT("Getting configuration for port %s", port->name);
1450
1451 #ifdef _WIN32
1452         if (!GetCommState(port->hdl, &data->dcb))
1453                 RETURN_FAIL("GetCommState() failed");
1454
1455         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1456                 if (data->dcb.BaudRate == std_baudrates[i].index) {
1457                         config->baudrate = std_baudrates[i].value;
1458                         break;
1459                 }
1460         }
1461
1462         if (i == NUM_STD_BAUDRATES)
1463                 /* BaudRate field can be either an index or a custom baud rate. */
1464                 config->baudrate = data->dcb.BaudRate;
1465
1466         config->bits = data->dcb.ByteSize;
1467
1468         if (data->dcb.fParity)
1469                 switch (data->dcb.Parity) {
1470                 case NOPARITY:
1471                         config->parity = SP_PARITY_NONE;
1472                         break;
1473                 case ODDPARITY:
1474                         config->parity = SP_PARITY_ODD;
1475                         break;
1476                 case EVENPARITY:
1477                         config->parity = SP_PARITY_EVEN;
1478                         break;
1479                 case MARKPARITY:
1480                         config->parity = SP_PARITY_MARK;
1481                         break;
1482                 case SPACEPARITY:
1483                         config->parity = SP_PARITY_SPACE;
1484                         break;
1485                 default:
1486                         config->parity = -1;
1487                 }
1488         else
1489                 config->parity = SP_PARITY_NONE;
1490
1491         switch (data->dcb.StopBits) {
1492         case ONESTOPBIT:
1493                 config->stopbits = 1;
1494                 break;
1495         case TWOSTOPBITS:
1496                 config->stopbits = 2;
1497                 break;
1498         default:
1499                 config->stopbits = -1;
1500         }
1501
1502         switch (data->dcb.fRtsControl) {
1503         case RTS_CONTROL_DISABLE:
1504                 config->rts = SP_RTS_OFF;
1505                 break;
1506         case RTS_CONTROL_ENABLE:
1507                 config->rts = SP_RTS_ON;
1508                 break;
1509         case RTS_CONTROL_HANDSHAKE:
1510                 config->rts = SP_RTS_FLOW_CONTROL;
1511                 break;
1512         default:
1513                 config->rts = -1;
1514         }
1515
1516         config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1517
1518         switch (data->dcb.fDtrControl) {
1519         case DTR_CONTROL_DISABLE:
1520                 config->dtr = SP_DTR_OFF;
1521                 break;
1522         case DTR_CONTROL_ENABLE:
1523                 config->dtr = SP_DTR_ON;
1524                 break;
1525         case DTR_CONTROL_HANDSHAKE:
1526                 config->dtr = SP_DTR_FLOW_CONTROL;
1527                 break;
1528         default:
1529                 config->dtr = -1;
1530         }
1531
1532         config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1533
1534         if (data->dcb.fInX) {
1535                 if (data->dcb.fOutX)
1536                         config->xon_xoff = SP_XONXOFF_INOUT;
1537                 else
1538                         config->xon_xoff = SP_XONXOFF_IN;
1539         } else {
1540                 if (data->dcb.fOutX)
1541                         config->xon_xoff = SP_XONXOFF_OUT;
1542                 else
1543                         config->xon_xoff = SP_XONXOFF_DISABLED;
1544         }
1545
1546 #else // !_WIN32
1547
1548         if (tcgetattr(port->fd, &data->term) < 0)
1549                 RETURN_FAIL("tcgetattr() failed");
1550
1551         if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
1552                 RETURN_FAIL("TIOCMGET ioctl failed");
1553
1554 #ifdef USE_TERMIOX
1555         int ret = get_flow(port->fd, data);
1556
1557         if (ret == SP_ERR_FAIL && errno == EINVAL)
1558                 data->termiox_supported = 0;
1559         else if (ret < 0)
1560                 RETURN_CODEVAL(ret);
1561         else
1562                 data->termiox_supported = 1;
1563 #else
1564         data->termiox_supported = 0;
1565 #endif
1566
1567         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1568                 if (cfgetispeed(&data->term) == std_baudrates[i].index) {
1569                         config->baudrate = std_baudrates[i].value;
1570                         break;
1571                 }
1572         }
1573
1574         if (i == NUM_STD_BAUDRATES) {
1575 #ifdef __APPLE__
1576                 config->baudrate = (int)data->term.c_ispeed;
1577 #elif defined(USE_TERMIOS_SPEED)
1578                 TRY(get_baudrate(port->fd, &config->baudrate));
1579 #else
1580                 config->baudrate = -1;
1581 #endif
1582         }
1583
1584         switch (data->term.c_cflag & CSIZE) {
1585         case CS8:
1586                 config->bits = 8;
1587                 break;
1588         case CS7:
1589                 config->bits = 7;
1590                 break;
1591         case CS6:
1592                 config->bits = 6;
1593                 break;
1594         case CS5:
1595                 config->bits = 5;
1596                 break;
1597         default:
1598                 config->bits = -1;
1599         }
1600
1601         if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
1602                 config->parity = SP_PARITY_NONE;
1603         else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
1604                 config->parity = -1;
1605 #ifdef CMSPAR
1606         else if (data->term.c_cflag & CMSPAR)
1607                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_MARK : SP_PARITY_SPACE;
1608 #endif
1609         else
1610                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
1611
1612         config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
1613
1614         if (data->term.c_cflag & CRTSCTS) {
1615                 config->rts = SP_RTS_FLOW_CONTROL;
1616                 config->cts = SP_CTS_FLOW_CONTROL;
1617         } else {
1618                 if (data->termiox_supported && data->rts_flow)
1619                         config->rts = SP_RTS_FLOW_CONTROL;
1620                 else
1621                         config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
1622
1623                 config->cts = (data->termiox_supported && data->cts_flow) ?
1624                         SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1625         }
1626
1627         if (data->termiox_supported && data->dtr_flow)
1628                 config->dtr = SP_DTR_FLOW_CONTROL;
1629         else
1630                 config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
1631
1632         config->dsr = (data->termiox_supported && data->dsr_flow) ?
1633                 SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1634
1635         if (data->term.c_iflag & IXOFF) {
1636                 if (data->term.c_iflag & IXON)
1637                         config->xon_xoff = SP_XONXOFF_INOUT;
1638                 else
1639                         config->xon_xoff = SP_XONXOFF_IN;
1640         } else {
1641                 if (data->term.c_iflag & IXON)
1642                         config->xon_xoff = SP_XONXOFF_OUT;
1643                 else
1644                         config->xon_xoff = SP_XONXOFF_DISABLED;
1645         }
1646 #endif
1647
1648         RETURN_OK();
1649 }
1650
1651 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
1652         const struct sp_port_config *config)
1653 {
1654         unsigned int i;
1655 #ifdef __APPLE__
1656         BAUD_TYPE baud_nonstd;
1657
1658         baud_nonstd = B0;
1659 #endif
1660 #ifdef USE_TERMIOS_SPEED
1661         int baud_nonstd = 0;
1662 #endif
1663
1664         TRACE("%p, %p, %p", port, data, config);
1665
1666         DEBUG_FMT("Setting configuration for port %s", port->name);
1667
1668 #ifdef _WIN32
1669         if (config->baudrate >= 0) {
1670                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1671                         if (config->baudrate == std_baudrates[i].value) {
1672                                 data->dcb.BaudRate = std_baudrates[i].index;
1673                                 break;
1674                         }
1675                 }
1676
1677                 if (i == NUM_STD_BAUDRATES)
1678                         data->dcb.BaudRate = config->baudrate;
1679         }
1680
1681         if (config->bits >= 0)
1682                 data->dcb.ByteSize = config->bits;
1683
1684         if (config->parity >= 0) {
1685                 switch (config->parity) {
1686                 case SP_PARITY_NONE:
1687                         data->dcb.Parity = NOPARITY;
1688                         break;
1689                 case SP_PARITY_ODD:
1690                         data->dcb.Parity = ODDPARITY;
1691                         break;
1692                 case SP_PARITY_EVEN:
1693                         data->dcb.Parity = EVENPARITY;
1694                         break;
1695                 case SP_PARITY_MARK:
1696                         data->dcb.Parity = MARKPARITY;
1697                         break;
1698                 case SP_PARITY_SPACE:
1699                         data->dcb.Parity = SPACEPARITY;
1700                         break;
1701                 default:
1702                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1703                 }
1704         }
1705
1706         if (config->stopbits >= 0) {
1707                 switch (config->stopbits) {
1708                 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
1709                 case 1:
1710                         data->dcb.StopBits = ONESTOPBIT;
1711                         break;
1712                 case 2:
1713                         data->dcb.StopBits = TWOSTOPBITS;
1714                         break;
1715                 default:
1716                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bit setting");
1717                 }
1718         }
1719
1720         if (config->rts >= 0) {
1721                 switch (config->rts) {
1722                 case SP_RTS_OFF:
1723                         data->dcb.fRtsControl = RTS_CONTROL_DISABLE;
1724                         break;
1725                 case SP_RTS_ON:
1726                         data->dcb.fRtsControl = RTS_CONTROL_ENABLE;
1727                         break;
1728                 case SP_RTS_FLOW_CONTROL:
1729                         data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
1730                         break;
1731                 default:
1732                         RETURN_ERROR(SP_ERR_ARG, "Invalid RTS setting");
1733                 }
1734         }
1735
1736         if (config->cts >= 0) {
1737                 switch (config->cts) {
1738                 case SP_CTS_IGNORE:
1739                         data->dcb.fOutxCtsFlow = FALSE;
1740                         break;
1741                 case SP_CTS_FLOW_CONTROL:
1742                         data->dcb.fOutxCtsFlow = TRUE;
1743                         break;
1744                 default:
1745                         RETURN_ERROR(SP_ERR_ARG, "Invalid CTS setting");
1746                 }
1747         }
1748
1749         if (config->dtr >= 0) {
1750                 switch (config->dtr) {
1751                 case SP_DTR_OFF:
1752                         data->dcb.fDtrControl = DTR_CONTROL_DISABLE;
1753                         break;
1754                 case SP_DTR_ON:
1755                         data->dcb.fDtrControl = DTR_CONTROL_ENABLE;
1756                         break;
1757                 case SP_DTR_FLOW_CONTROL:
1758                         data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
1759                         break;
1760                 default:
1761                         RETURN_ERROR(SP_ERR_ARG, "Invalid DTR setting");
1762                 }
1763         }
1764
1765         if (config->dsr >= 0) {
1766                 switch (config->dsr) {
1767                 case SP_DSR_IGNORE:
1768                         data->dcb.fOutxDsrFlow = FALSE;
1769                         break;
1770                 case SP_DSR_FLOW_CONTROL:
1771                         data->dcb.fOutxDsrFlow = TRUE;
1772                         break;
1773                 default:
1774                         RETURN_ERROR(SP_ERR_ARG, "Invalid DSR setting");
1775                 }
1776         }
1777
1778         if (config->xon_xoff >= 0) {
1779                 switch (config->xon_xoff) {
1780                 case SP_XONXOFF_DISABLED:
1781                         data->dcb.fInX = FALSE;
1782                         data->dcb.fOutX = FALSE;
1783                         break;
1784                 case SP_XONXOFF_IN:
1785                         data->dcb.fInX = TRUE;
1786                         data->dcb.fOutX = FALSE;
1787                         break;
1788                 case SP_XONXOFF_OUT:
1789                         data->dcb.fInX = FALSE;
1790                         data->dcb.fOutX = TRUE;
1791                         break;
1792                 case SP_XONXOFF_INOUT:
1793                         data->dcb.fInX = TRUE;
1794                         data->dcb.fOutX = TRUE;
1795                         break;
1796                 default:
1797                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1798                 }
1799         }
1800
1801         if (!SetCommState(port->hdl, &data->dcb))
1802                 RETURN_FAIL("SetCommState() failed");
1803
1804 #else /* !_WIN32 */
1805
1806         int controlbits;
1807
1808         if (config->baudrate >= 0) {
1809                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1810                         if (config->baudrate == std_baudrates[i].value) {
1811                                 if (cfsetospeed(&data->term, std_baudrates[i].index) < 0)
1812                                         RETURN_FAIL("cfsetospeed() failed");
1813
1814                                 if (cfsetispeed(&data->term, std_baudrates[i].index) < 0)
1815                                         RETURN_FAIL("cfsetispeed() failed");
1816                                 break;
1817                         }
1818                 }
1819
1820                 /* Non-standard baud rate */
1821                 if (i == NUM_STD_BAUDRATES) {
1822 #ifdef __APPLE__
1823                         /* Set "dummy" baud rate. */
1824                         if (cfsetspeed(&data->term, B9600) < 0)
1825                                 RETURN_FAIL("cfsetspeed() failed");
1826                         baud_nonstd = config->baudrate;
1827 #elif defined(USE_TERMIOS_SPEED)
1828                         baud_nonstd = 1;
1829 #else
1830                         RETURN_ERROR(SP_ERR_SUPP, "Non-standard baudrate not supported");
1831 #endif
1832                 }
1833         }
1834
1835         if (config->bits >= 0) {
1836                 data->term.c_cflag &= ~CSIZE;
1837                 switch (config->bits) {
1838                 case 8:
1839                         data->term.c_cflag |= CS8;
1840                         break;
1841                 case 7:
1842                         data->term.c_cflag |= CS7;
1843                         break;
1844                 case 6:
1845                         data->term.c_cflag |= CS6;
1846                         break;
1847                 case 5:
1848                         data->term.c_cflag |= CS5;
1849                         break;
1850                 default:
1851                         RETURN_ERROR(SP_ERR_ARG, "Invalid data bits setting");
1852                 }
1853         }
1854
1855         if (config->parity >= 0) {
1856                 data->term.c_iflag &= ~IGNPAR;
1857                 data->term.c_cflag &= ~(PARENB | PARODD);
1858 #ifdef CMSPAR
1859                 data->term.c_cflag &= ~CMSPAR;
1860 #endif
1861                 switch (config->parity) {
1862                 case SP_PARITY_NONE:
1863                         data->term.c_iflag |= IGNPAR;
1864                         break;
1865                 case SP_PARITY_EVEN:
1866                         data->term.c_cflag |= PARENB;
1867                         break;
1868                 case SP_PARITY_ODD:
1869                         data->term.c_cflag |= PARENB | PARODD;
1870                         break;
1871 #ifdef CMSPAR
1872                 case SP_PARITY_MARK:
1873                         data->term.c_cflag |= PARENB | PARODD;
1874                         data->term.c_cflag |= CMSPAR;
1875                         break;
1876                 case SP_PARITY_SPACE:
1877                         data->term.c_cflag |= PARENB;
1878                         data->term.c_cflag |= CMSPAR;
1879                         break;
1880 #else
1881                 case SP_PARITY_MARK:
1882                 case SP_PARITY_SPACE:
1883                         RETURN_ERROR(SP_ERR_SUPP, "Mark/space parity not supported");
1884 #endif
1885                 default:
1886                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1887                 }
1888         }
1889
1890         if (config->stopbits >= 0) {
1891                 data->term.c_cflag &= ~CSTOPB;
1892                 switch (config->stopbits) {
1893                 case 1:
1894                         data->term.c_cflag &= ~CSTOPB;
1895                         break;
1896                 case 2:
1897                         data->term.c_cflag |= CSTOPB;
1898                         break;
1899                 default:
1900                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bits setting");
1901                 }
1902         }
1903
1904         if (config->rts >= 0 || config->cts >= 0) {
1905                 if (data->termiox_supported) {
1906                         data->rts_flow = data->cts_flow = 0;
1907                         switch (config->rts) {
1908                         case SP_RTS_OFF:
1909                         case SP_RTS_ON:
1910                                 controlbits = TIOCM_RTS;
1911                                 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
1912                                         RETURN_FAIL("Setting RTS signal level failed");
1913                                 break;
1914                         case SP_RTS_FLOW_CONTROL:
1915                                 data->rts_flow = 1;
1916                                 break;
1917                         default:
1918                                 break;
1919                         }
1920                         if (config->cts == SP_CTS_FLOW_CONTROL)
1921                                 data->cts_flow = 1;
1922
1923                         if (data->rts_flow && data->cts_flow)
1924                                 data->term.c_iflag |= CRTSCTS;
1925                         else
1926                                 data->term.c_iflag &= ~CRTSCTS;
1927                 } else {
1928                         /* Asymmetric use of RTS/CTS not supported. */
1929                         if (data->term.c_iflag & CRTSCTS) {
1930                                 /* Flow control can only be disabled for both RTS & CTS together. */
1931                                 if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
1932                                         if (config->cts != SP_CTS_IGNORE)
1933                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
1934                                 }
1935                                 if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
1936                                         if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
1937                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
1938                                 }
1939                         } else {
1940                                 /* Flow control can only be enabled for both RTS & CTS together. */
1941                                 if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
1942                                         ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
1943                                         RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be enabled together");
1944                         }
1945
1946                         if (config->rts >= 0) {
1947                                 if (config->rts == SP_RTS_FLOW_CONTROL) {
1948                                         data->term.c_iflag |= CRTSCTS;
1949                                 } else {
1950                                         controlbits = TIOCM_RTS;
1951                                         if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
1952                                                         &controlbits) < 0)
1953                                                 RETURN_FAIL("Setting RTS signal level failed");
1954                                 }
1955                         }
1956                 }
1957         }
1958
1959         if (config->dtr >= 0 || config->dsr >= 0) {
1960                 if (data->termiox_supported) {
1961                         data->dtr_flow = data->dsr_flow = 0;
1962                         switch (config->dtr) {
1963                         case SP_DTR_OFF:
1964                         case SP_DTR_ON:
1965                                 controlbits = TIOCM_DTR;
1966                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
1967                                         RETURN_FAIL("Setting DTR signal level failed");
1968                                 break;
1969                         case SP_DTR_FLOW_CONTROL:
1970                                 data->dtr_flow = 1;
1971                                 break;
1972                         default:
1973                                 break;
1974                         }
1975                         if (config->dsr == SP_DSR_FLOW_CONTROL)
1976                                 data->dsr_flow = 1;
1977                 } else {
1978                         /* DTR/DSR flow control not supported. */
1979                         if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
1980                                 RETURN_ERROR(SP_ERR_SUPP, "DTR/DSR flow control not supported");
1981
1982                         if (config->dtr >= 0) {
1983                                 controlbits = TIOCM_DTR;
1984                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
1985                                                 &controlbits) < 0)
1986                                         RETURN_FAIL("Setting DTR signal level failed");
1987                         }
1988                 }
1989         }
1990
1991         if (config->xon_xoff >= 0) {
1992                 data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
1993                 switch (config->xon_xoff) {
1994                 case SP_XONXOFF_DISABLED:
1995                         break;
1996                 case SP_XONXOFF_IN:
1997                         data->term.c_iflag |= IXOFF;
1998                         break;
1999                 case SP_XONXOFF_OUT:
2000                         data->term.c_iflag |= IXON | IXANY;
2001                         break;
2002                 case SP_XONXOFF_INOUT:
2003                         data->term.c_iflag |= IXON | IXOFF | IXANY;
2004                         break;
2005                 default:
2006                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
2007                 }
2008         }
2009
2010         if (tcsetattr(port->fd, TCSANOW, &data->term) < 0)
2011                 RETURN_FAIL("tcsetattr() failed");
2012
2013 #ifdef __APPLE__
2014         if (baud_nonstd != B0) {
2015                 if (ioctl(port->fd, IOSSIOSPEED, &baud_nonstd) == -1)
2016                         RETURN_FAIL("IOSSIOSPEED ioctl failed");
2017                 /*
2018                  * Set baud rates in data->term to correct, but incompatible
2019                  * with tcsetattr() value, same as delivered by tcgetattr().
2020                  */
2021                 if (cfsetspeed(&data->term, baud_nonstd) < 0)
2022                         RETURN_FAIL("cfsetspeed() failed");
2023         }
2024 #elif defined(__linux__)
2025 #ifdef USE_TERMIOS_SPEED
2026         if (baud_nonstd)
2027                 TRY(set_baudrate(port->fd, config->baudrate));
2028 #endif
2029 #ifdef USE_TERMIOX
2030         if (data->termiox_supported)
2031                 TRY(set_flow(port->fd, data));
2032 #endif
2033 #endif
2034
2035 #endif /* !_WIN32 */
2036
2037         RETURN_OK();
2038 }
2039
2040 SP_API enum sp_return sp_new_config(struct sp_port_config **config_ptr)
2041 {
2042         struct sp_port_config *config;
2043
2044         TRACE("%p", config_ptr);
2045
2046         if (!config_ptr)
2047                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2048
2049         *config_ptr = NULL;
2050
2051         if (!(config = malloc(sizeof(struct sp_port_config))))
2052                 RETURN_ERROR(SP_ERR_MEM, "Config malloc failed");
2053
2054         config->baudrate = -1;
2055         config->bits = -1;
2056         config->parity = -1;
2057         config->stopbits = -1;
2058         config->rts = -1;
2059         config->cts = -1;
2060         config->dtr = -1;
2061         config->dsr = -1;
2062
2063         *config_ptr = config;
2064
2065         RETURN_OK();
2066 }
2067
2068 SP_API void sp_free_config(struct sp_port_config *config)
2069 {
2070         TRACE("%p", config);
2071
2072         if (!config)
2073                 DEBUG("Null config");
2074         else
2075                 free(config);
2076
2077         RETURN();
2078 }
2079
2080 SP_API enum sp_return sp_get_config(struct sp_port *port,
2081                                     struct sp_port_config *config)
2082 {
2083         struct port_data data;
2084
2085         TRACE("%p, %p", port, config);
2086
2087         CHECK_OPEN_PORT();
2088
2089         if (!config)
2090                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2091
2092         TRY(get_config(port, &data, config));
2093
2094         RETURN_OK();
2095 }
2096
2097 SP_API enum sp_return sp_set_config(struct sp_port *port,
2098                                     const struct sp_port_config *config)
2099 {
2100         struct port_data data;
2101         struct sp_port_config prev_config;
2102
2103         TRACE("%p, %p", port, config);
2104
2105         CHECK_OPEN_PORT();
2106
2107         if (!config)
2108                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2109
2110         TRY(get_config(port, &data, &prev_config));
2111         TRY(set_config(port, &data, config));
2112
2113         RETURN_OK();
2114 }
2115
2116 #define CREATE_ACCESSORS(x, type) \
2117 SP_API enum sp_return sp_set_##x(struct sp_port *port, type x) { \
2118         struct port_data data; \
2119         struct sp_port_config config; \
2120         TRACE("%p, %d", port, x); \
2121         CHECK_OPEN_PORT(); \
2122         TRY(get_config(port, &data, &config)); \
2123         config.x = x; \
2124         TRY(set_config(port, &data, &config)); \
2125         RETURN_OK(); \
2126 } \
2127 SP_API enum sp_return sp_get_config_##x(const struct sp_port_config *config, \
2128                                         type *x) { \
2129         TRACE("%p, %p", config, x); \
2130         if (!x) \
2131                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer"); \
2132         if (!config) \
2133                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2134         *x = config->x; \
2135         RETURN_OK(); \
2136 } \
2137 SP_API enum sp_return sp_set_config_##x(struct sp_port_config *config, \
2138                                         type x) { \
2139         TRACE("%p, %d", config, x); \
2140         if (!config) \
2141                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2142         config->x = x; \
2143         RETURN_OK(); \
2144 }
2145
2146 CREATE_ACCESSORS(baudrate, int)
2147 CREATE_ACCESSORS(bits, int)
2148 CREATE_ACCESSORS(parity, enum sp_parity)
2149 CREATE_ACCESSORS(stopbits, int)
2150 CREATE_ACCESSORS(rts, enum sp_rts)
2151 CREATE_ACCESSORS(cts, enum sp_cts)
2152 CREATE_ACCESSORS(dtr, enum sp_dtr)
2153 CREATE_ACCESSORS(dsr, enum sp_dsr)
2154 CREATE_ACCESSORS(xon_xoff, enum sp_xonxoff)
2155
2156 SP_API enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config,
2157                                                 enum sp_flowcontrol flowcontrol)
2158 {
2159         if (!config)
2160                 RETURN_ERROR(SP_ERR_ARG, "Null configuration");
2161
2162         if (flowcontrol > SP_FLOWCONTROL_DTRDSR)
2163                 RETURN_ERROR(SP_ERR_ARG, "Invalid flow control setting");
2164
2165         if (flowcontrol == SP_FLOWCONTROL_XONXOFF)
2166                 config->xon_xoff = SP_XONXOFF_INOUT;
2167         else
2168                 config->xon_xoff = SP_XONXOFF_DISABLED;
2169
2170         if (flowcontrol == SP_FLOWCONTROL_RTSCTS) {
2171                 config->rts = SP_RTS_FLOW_CONTROL;
2172                 config->cts = SP_CTS_FLOW_CONTROL;
2173         } else {
2174                 if (config->rts == SP_RTS_FLOW_CONTROL)
2175                         config->rts = SP_RTS_ON;
2176                 config->cts = SP_CTS_IGNORE;
2177         }
2178
2179         if (flowcontrol == SP_FLOWCONTROL_DTRDSR) {
2180                 config->dtr = SP_DTR_FLOW_CONTROL;
2181                 config->dsr = SP_DSR_FLOW_CONTROL;
2182         } else {
2183                 if (config->dtr == SP_DTR_FLOW_CONTROL)
2184                         config->dtr = SP_DTR_ON;
2185                 config->dsr = SP_DSR_IGNORE;
2186         }
2187
2188         RETURN_OK();
2189 }
2190
2191 SP_API enum sp_return sp_set_flowcontrol(struct sp_port *port,
2192                                          enum sp_flowcontrol flowcontrol)
2193 {
2194         struct port_data data;
2195         struct sp_port_config config;
2196
2197         TRACE("%p, %d", port, flowcontrol);
2198
2199         CHECK_OPEN_PORT();
2200
2201         TRY(get_config(port, &data, &config));
2202
2203         TRY(sp_set_config_flowcontrol(&config, flowcontrol));
2204
2205         TRY(set_config(port, &data, &config));
2206
2207         RETURN_OK();
2208 }
2209
2210 SP_API enum sp_return sp_get_signals(struct sp_port *port,
2211                                      enum sp_signal *signals)
2212 {
2213         TRACE("%p, %p", port, signals);
2214
2215         CHECK_OPEN_PORT();
2216
2217         if (!signals)
2218                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2219
2220         DEBUG_FMT("Getting control signals for port %s", port->name);
2221
2222         *signals = 0;
2223 #ifdef _WIN32
2224         DWORD bits;
2225         if (GetCommModemStatus(port->hdl, &bits) == 0)
2226                 RETURN_FAIL("GetCommModemStatus() failed");
2227         if (bits & MS_CTS_ON)
2228                 *signals |= SP_SIG_CTS;
2229         if (bits & MS_DSR_ON)
2230                 *signals |= SP_SIG_DSR;
2231         if (bits & MS_RLSD_ON)
2232                 *signals |= SP_SIG_DCD;
2233         if (bits & MS_RING_ON)
2234                 *signals |= SP_SIG_RI;
2235 #else
2236         int bits;
2237         if (ioctl(port->fd, TIOCMGET, &bits) < 0)
2238                 RETURN_FAIL("TIOCMGET ioctl failed");
2239         if (bits & TIOCM_CTS)
2240                 *signals |= SP_SIG_CTS;
2241         if (bits & TIOCM_DSR)
2242                 *signals |= SP_SIG_DSR;
2243         if (bits & TIOCM_CAR)
2244                 *signals |= SP_SIG_DCD;
2245         if (bits & TIOCM_RNG)
2246                 *signals |= SP_SIG_RI;
2247 #endif
2248         RETURN_OK();
2249 }
2250
2251 SP_API enum sp_return sp_start_break(struct sp_port *port)
2252 {
2253         TRACE("%p", port);
2254
2255         CHECK_OPEN_PORT();
2256 #ifdef _WIN32
2257         if (SetCommBreak(port->hdl) == 0)
2258                 RETURN_FAIL("SetCommBreak() failed");
2259 #else
2260         if (ioctl(port->fd, TIOCSBRK, 1) < 0)
2261                 RETURN_FAIL("TIOCSBRK ioctl failed");
2262 #endif
2263
2264         RETURN_OK();
2265 }
2266
2267 SP_API enum sp_return sp_end_break(struct sp_port *port)
2268 {
2269         TRACE("%p", port);
2270
2271         CHECK_OPEN_PORT();
2272 #ifdef _WIN32
2273         if (ClearCommBreak(port->hdl) == 0)
2274                 RETURN_FAIL("ClearCommBreak() failed");
2275 #else
2276         if (ioctl(port->fd, TIOCCBRK, 1) < 0)
2277                 RETURN_FAIL("TIOCCBRK ioctl failed");
2278 #endif
2279
2280         RETURN_OK();
2281 }
2282
2283 SP_API int sp_last_error_code(void)
2284 {
2285         TRACE_VOID();
2286 #ifdef _WIN32
2287         RETURN_INT(GetLastError());
2288 #else
2289         RETURN_INT(errno);
2290 #endif
2291 }
2292
2293 SP_API char *sp_last_error_message(void)
2294 {
2295         TRACE_VOID();
2296
2297 #ifdef _WIN32
2298         TCHAR *message;
2299         DWORD error = GetLastError();
2300
2301         DWORD length = FormatMessage(
2302                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
2303                 FORMAT_MESSAGE_FROM_SYSTEM |
2304                 FORMAT_MESSAGE_IGNORE_INSERTS,
2305                 NULL,
2306                 error,
2307                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
2308                 (LPTSTR) &message,
2309                 0, NULL );
2310
2311         if (length >= 2 && message[length - 2] == '\r')
2312                 message[length - 2] = '\0';
2313
2314         RETURN_STRING(message);
2315 #else
2316         RETURN_STRING(strerror(errno));
2317 #endif
2318 }
2319
2320 SP_API void sp_free_error_message(char *message)
2321 {
2322         TRACE("%s", message);
2323
2324 #ifdef _WIN32
2325         LocalFree(message);
2326 #else
2327         (void)message;
2328 #endif
2329
2330         RETURN();
2331 }
2332
2333 SP_API void sp_set_debug_handler(void (*handler)(const char *format, ...))
2334 {
2335         TRACE("%p", handler);
2336
2337         sp_debug_handler = handler;
2338
2339         RETURN();
2340 }
2341
2342 SP_API void sp_default_debug_handler(const char *format, ...)
2343 {
2344         va_list args;
2345         va_start(args, format);
2346         if (getenv("LIBSERIALPORT_DEBUG")) {
2347                 fputs("sp: ", stderr);
2348                 vfprintf(stderr, format, args);
2349         }
2350         va_end(args);
2351 }
2352
2353 SP_API int sp_get_major_package_version(void)
2354 {
2355         return SP_PACKAGE_VERSION_MAJOR;
2356 }
2357
2358 SP_API int sp_get_minor_package_version(void)
2359 {
2360         return SP_PACKAGE_VERSION_MINOR;
2361 }
2362
2363 SP_API int sp_get_micro_package_version(void)
2364 {
2365         return SP_PACKAGE_VERSION_MICRO;
2366 }
2367
2368 SP_API const char *sp_get_package_version_string(void)
2369 {
2370         return SP_PACKAGE_VERSION_STRING;
2371 }
2372
2373 SP_API int sp_get_current_lib_version(void)
2374 {
2375         return SP_LIB_VERSION_CURRENT;
2376 }
2377
2378 SP_API int sp_get_revision_lib_version(void)
2379 {
2380         return SP_LIB_VERSION_REVISION;
2381 }
2382
2383 SP_API int sp_get_age_lib_version(void)
2384 {
2385         return SP_LIB_VERSION_AGE;
2386 }
2387
2388 SP_API const char *sp_get_lib_version_string(void)
2389 {
2390         return SP_LIB_VERSION_STRING;
2391 }
2392
2393 /** @} */