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  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU Lesser General Public License as
  11  * published by the Free Software Foundation, either version 3 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <stdio.h>
  31 #include <stdarg.h>
  32 #ifdef _WIN32
  33 #include <windows.h>
  34 #include <tchar.h>
  35 #else
  36 #include <limits.h>
  37 #include <termios.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/time.h>
  40 #include <limits.h>
  41 #include <poll.h>
  42 #endif
  43 #ifdef __APPLE__
  44 #include <IOKit/IOKitLib.h>
  45 #include <IOKit/serial/IOSerialKeys.h>
  46 #include <IOKit/serial/ioss.h>
  47 #include <sys/syslimits.h>
  48 #endif
  49 #ifdef __linux__
  50 #include <dirent.h>
  51 #ifndef __ANDROID__
  52 #include "linux/serial.h"
  53 #endif
  54 #include "linux_termios.h"
  55
  56 /* TCGETX/TCSETX is not available everywhere. */
  57 #if defined(TCGETX) && defined(TCSETX) && defined(HAVE_TERMIOX)
  58 #define USE_TERMIOX
  59 #endif
  60 #endif
  61
  62 /* TIOCINQ/TIOCOUTQ is not available everywhere. */
  63 #if !defined(TIOCINQ) && defined(FIONREAD)
  64 #define TIOCINQ FIONREAD
  65 #endif
  66 #if !defined(TIOCOUTQ) && defined(FIONWRITE)
  67 #define TIOCOUTQ FIONWRITE
  68 #endif
  69
  70 /* Non-standard baudrates are not available everywhere. */
  71 #if defined(HAVE_TERMIOS_SPEED) || defined(HAVE_TERMIOS2_SPEED)
  72 #define USE_TERMIOS_SPEED
  73 #endif
  74
  75 #include "libserialport.h"
  76
  77 struct sp_port {
  78         char *name;
  79 #ifdef _WIN32
  80         HANDLE hdl;
  81         COMMTIMEOUTS timeouts;
  82         OVERLAPPED write_ovl;
  83         OVERLAPPED read_ovl;
  84         OVERLAPPED wait_ovl;
  85         DWORD events;
  86         BYTE pending_byte;
  87         BOOL writing;
  88 #else
  89         int fd;
  90 #endif
  91 };
  92
  93 struct sp_port_config {
  94         int baudrate;
  95         int bits;
  96         enum sp_parity parity;
  97         int stopbits;
  98         enum sp_rts rts;
  99         enum sp_cts cts;
 100         enum sp_dtr dtr;
 101         enum sp_dsr dsr;
 102         enum sp_xonxoff xon_xoff;
 103 };
 104
 105 struct port_data {
 106 #ifdef _WIN32
 107         DCB dcb;
 108 #else
 109         struct termios term;
 110         int controlbits;
 111         int termiox_supported;
 112         int rts_flow;
 113         int cts_flow;
 114         int dtr_flow;
 115         int dsr_flow;
 116 #endif
 117 };
 118
 119 #ifdef _WIN32
 120 typedef HANDLE event_handle;
 121 #else
 122 typedef int event_handle;
 123 #endif
 124
 125 /* Standard baud rates. */
 126 #ifdef _WIN32
 127 #define BAUD_TYPE DWORD
 128 #define BAUD(n) {CBR_##n, n}
 129 #else
 130 #define BAUD_TYPE speed_t
 131 #define BAUD(n) {B##n, n}
 132 #endif
 133
 134 struct std_baudrate {
 135         BAUD_TYPE index;
 136         int value;
 137 };
 138
 139 const struct std_baudrate std_baudrates[] = {
 140 #ifdef _WIN32
 141         /*
 142          * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
 143          * have documented CBR_* macros.
 144          */
 145         BAUD(110), BAUD(300), BAUD(600), BAUD(1200), BAUD(2400), BAUD(4800),
 146         BAUD(9600), BAUD(14400), BAUD(19200), BAUD(38400), BAUD(57600),
 147         BAUD(115200), BAUD(128000), BAUD(256000),
 148 #else
 149         BAUD(50), BAUD(75), BAUD(110), BAUD(134), BAUD(150), BAUD(200),
 150         BAUD(300), BAUD(600), BAUD(1200), BAUD(1800), BAUD(2400), BAUD(4800),
 151         BAUD(9600), BAUD(19200), BAUD(38400), BAUD(57600), BAUD(115200),
 152         BAUD(230400),
 153 #if !defined(__APPLE__) && !defined(__OpenBSD__)
 154         BAUD(460800),
 155 #endif
 156 #endif
 157 };
 158
 159 void (*sp_debug_handler)(const char *format, ...) = sp_default_debug_handler;
 160
 161 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
 162 #define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
 163
 164 /* Debug output macros. */
 165 #define DEBUG(fmt, ...) do { if (sp_debug_handler) sp_debug_handler(fmt ".\n", ##__VA_ARGS__); } while (0)
 166 #define DEBUG_ERROR(err, fmt, ...) DEBUG("%s returning " #err ": " fmt, __func__, ##__VA_ARGS__)
 167 #define DEBUG_FAIL(fmt, ...) do {               \
 168         char *errmsg = sp_last_error_message(); \
 169         DEBUG("%s returning SP_ERR_FAIL: "fmt": %s", __func__,##__VA_ARGS__,errmsg); \
 170         sp_free_error_message(errmsg); \
 171 } while (0);
 172 #define RETURN() do { DEBUG("%s returning", __func__); return; } while(0)
 173 #define RETURN_CODE(x) do { DEBUG("%s returning " #x, __func__); return x; } while (0)
 174 #define RETURN_CODEVAL(x) do { \
 175         switch (x) { \
 176                 case SP_OK: RETURN_CODE(SP_OK); \
 177                 case SP_ERR_ARG: RETURN_CODE(SP_ERR_ARG); \
 178                 case SP_ERR_FAIL: RETURN_CODE(SP_ERR_FAIL); \
 179                 case SP_ERR_MEM: RETURN_CODE(SP_ERR_MEM); \
 180                 case SP_ERR_SUPP: RETURN_CODE(SP_ERR_SUPP); \
 181         } \
 182 } while (0)
 183 #define RETURN_OK() RETURN_CODE(SP_OK);
 184 #define RETURN_ERROR(err, ...) do { DEBUG_ERROR(err, __VA_ARGS__); return err; } while (0)
 185 #define RETURN_FAIL(...) do { DEBUG_FAIL(__VA_ARGS__); return SP_ERR_FAIL; } while (0)
 186 #define RETURN_VALUE(fmt, x) do { \
 187         typeof(x) _x = x; \
 188         DEBUG("%s returning " fmt, __func__, _x); \
 189         return _x; \
 190 } while (0)
 191 #define SET_ERROR(val, err, msg) do { DEBUG_ERROR(err, msg); val = err; } while (0)
 192 #define SET_FAIL(val, msg) do { DEBUG_FAIL(msg); val = SP_ERR_FAIL; } while (0)
 193 #define TRACE(fmt, ...) DEBUG("%s(" fmt ") called", __func__, ##__VA_ARGS__)
 194
 195 #define TRY(x) do { int ret = x; if (ret != SP_OK) RETURN_CODEVAL(ret); } while (0)
 196
 197 /* Helper functions. */
 198 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
 199         struct sp_port_config *config);
 200 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
 201         const struct sp_port_config *config);
 202
 203 enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
 204 {
 205         struct sp_port *port;
 206         int len;
 207
 208         TRACE("%s, %p", portname, port_ptr);
 209
 210         if (!port_ptr)
 211                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 212
 213         *port_ptr = NULL;
 214
 215         if (!portname)
 216                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
 217
 218         DEBUG("Building structure for port %s", portname);
 219
 220         if (!(port = malloc(sizeof(struct sp_port))))
 221                 RETURN_ERROR(SP_ERR_MEM, "Port structure malloc failed");
 222
 223         len = strlen(portname) + 1;
 224
 225         if (!(port->name = malloc(len))) {
 226                 free(port);
 227                 RETURN_ERROR(SP_ERR_MEM, "Port name malloc failed");
 228         }
 229
 230         memcpy(port->name, portname, len);
 231
 232 #ifdef _WIN32
 233         port->hdl = INVALID_HANDLE_VALUE;
 234 #else
 235         port->fd = -1;
 236 #endif
 237
 238         *port_ptr = port;
 239
 240         RETURN_OK();
 241 }
 242
 243 char *sp_get_port_name(const struct sp_port *port)
 244 {
 245         TRACE("%p", port);
 246
 247         if (!port)
 248                 return NULL;
 249
 250         RETURN_VALUE("%s", port->name);
 251 }
 252
 253 enum sp_return sp_get_port_handle(const struct sp_port *port, void *result_ptr)
 254 {
 255         TRACE("%p, %p", port, result_ptr);
 256
 257         if (!port)
 258                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 259
 260 #ifdef _WIN32
 261         HANDLE *handle_ptr = result_ptr;
 262         *handle_ptr = port->hdl;
 263 #else
 264         int *fd_ptr = result_ptr;
 265         *fd_ptr = port->fd;
 266 #endif
 267
 268         RETURN_OK();
 269 }
 270
 271 enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr)
 272 {
 273         TRACE("%p, %p", port, copy_ptr);
 274
 275         if (!copy_ptr)
 276                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 277
 278         *copy_ptr = NULL;
 279
 280         if (!port)
 281                 RETURN_ERROR(SP_ERR_ARG, "Null port");
 282
 283         if (!port->name)
 284                 RETURN_ERROR(SP_ERR_ARG, "Null port name");
 285
 286         DEBUG("Copying port structure");
 287
 288         RETURN_VALUE("%p", sp_get_port_by_name(port->name, copy_ptr));
 289 }
 290
 291 void sp_free_port(struct sp_port *port)
 292 {
 293         TRACE("%p", port);
 294
 295         if (!port) {
 296                 DEBUG("Null port");
 297                 RETURN();
 298         }
 299
 300         DEBUG("Freeing port structure");
 301
 302         if (port->name)
 303                 free(port->name);
 304
 305         free(port);
 306
 307         RETURN();
 308 }
 309
 310 static struct sp_port **list_append(struct sp_port **list, const char *portname)
 311 {
 312         void *tmp;
 313         unsigned int count;
 314
 315         for (count = 0; list[count]; count++);
 316         if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2))))
 317                 goto fail;
 318         list = tmp;
 319         if (sp_get_port_by_name(portname, &list[count]) != SP_OK)
 320                 goto fail;
 321         list[count + 1] = NULL;
 322         return list;
 323
 324 fail:
 325         sp_free_port_list(list);
 326         return NULL;
 327 }
 328
 329 enum sp_return sp_list_ports(struct sp_port ***list_ptr)
 330 {
 331         struct sp_port **list;
 332         int ret = SP_ERR_SUPP;
 333
 334         TRACE("%p", list_ptr);
 335
 336         if (!list_ptr)
 337                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
 338
 339         DEBUG("Enumerating ports");
 340
 341         if (!(list = malloc(sizeof(struct sp_port **))))
 342                 RETURN_ERROR(SP_ERR_MEM, "Port list malloc failed");
 343
 344         list[0] = NULL;
 345
 346 #ifdef _WIN32
 347         HKEY key;
 348         TCHAR *value, *data;
 349         DWORD max_value_len, max_data_size, max_data_len;
 350         DWORD value_len, data_size, data_len;
 351         DWORD type, index = 0;
 352         char *name;
 353         int name_len;
 354
 355         ret = SP_OK;
 356
 357         DEBUG("Opening registry key");
 358         if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
 359                         0, KEY_QUERY_VALUE, &key) != ERROR_SUCCESS) {
 360                 SET_FAIL(ret, "RegOpenKeyEx() failed");
 361                 goto out_done;
 362         }
 363         DEBUG("Querying registry key value and data sizes");
 364         if (RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 365                                 &max_value_len, &max_data_size, NULL, NULL) != ERROR_SUCCESS) {
 366                 SET_FAIL(ret, "RegQueryInfoKey() failed");
 367                 goto out_close;
 368         }
 369         max_data_len = max_data_size / sizeof(TCHAR);
 370         if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) {
 371                 SET_ERROR(ret, SP_ERR_MEM, "registry value malloc failed");
 372                 goto out_close;
 373         }
 374         if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) {
 375                 SET_ERROR(ret, SP_ERR_MEM, "registry data malloc failed");
 376                 goto out_free_value;
 377         }
 378         DEBUG("Iterating over values");
 379         while (
 380                 value_len = max_value_len + 1,
 381                 data_size = max_data_size,
 382                 RegEnumValue(key, index, value, &value_len,
 383                         NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS)
 384         {
 385                 data_len = data_size / sizeof(TCHAR);
 386                 data[data_len] = '\0';
 387 #ifdef UNICODE
 388                 name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL);
 389 #else
 390                 name_len = data_len + 1;
 391 #endif
 392                 if (!(name = malloc(name_len))) {
 393                         SET_ERROR(ret, SP_ERR_MEM, "registry port name malloc failed");
 394                         goto out;
 395                 }
 396 #ifdef UNICODE
 397                 WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL);
 398 #else
 399                 strcpy(name, data);
 400 #endif
 401                 if (type == REG_SZ) {
 402                         DEBUG("Found port %s", name);
 403                         if (!(list = list_append(list, name))) {
 404                                 SET_ERROR(ret, SP_ERR_MEM, "list append failed");
 405                                 goto out;
 406                         }
 407                 }
 408                 index++;
 409         }
 410 out:
 411         free(data);
 412 out_free_value:
 413         free(value);
 414 out_close:
 415         RegCloseKey(key);
 416 out_done:
 417 #endif
 418 #ifdef __APPLE__
 419         CFMutableDictionaryRef classes;
 420         io_iterator_t iter;
 421         char path[PATH_MAX];
 422         io_object_t port;
 423         CFTypeRef cf_path;
 424         Boolean result;
 425
 426         ret = SP_OK;
 427
 428         DEBUG("Creating matching dictionary");
 429         if (!(classes = IOServiceMatching(kIOSerialBSDServiceValue))) {
 430                 SET_FAIL(ret, "IOServiceMatching() failed");
 431                 goto out_done;
 432         }
 433
 434         DEBUG("Getting matching services");
 435         if (IOServiceGetMatchingServices(kIOMasterPortDefault, classes,
 436                                          &iter) != KERN_SUCCESS) {
 437                 SET_FAIL(ret, "IOServiceGetMatchingServices() failed");
 438                 goto out_done;
 439         }
 440
 441         DEBUG("Iterating over results");
 442         while ((port = IOIteratorNext(iter))) {
 443                 cf_path = IORegistryEntryCreateCFProperty(port,
 444                                 CFSTR(kIOCalloutDeviceKey), kCFAllocatorDefault, 0);
 445                 if (cf_path) {
 446                         result = CFStringGetCString(cf_path, path, sizeof(path),
 447                                                     kCFStringEncodingASCII);
 448                         CFRelease(cf_path);
 449                         if (result) {
 450                                 DEBUG("Found port %s", path);
 451                                 if (!(list = list_append(list, path))) {
 452                                         SET_ERROR(ret, SP_ERR_MEM, "list append failed");
 453                                         IOObjectRelease(port);
 454                                         goto out;
 455                                 }
 456                         }
 457                 }
 458                 IOObjectRelease(port);
 459         }
 460 out:
 461         IOObjectRelease(iter);
 462 out_done:
 463 #endif
 464 #ifdef __linux__
 465         char name[PATH_MAX], target[PATH_MAX];
 466         struct dirent entry, *result;
 467         struct serial_struct serial_info;
 468         int len, fd, ioctl_result;
 469         DIR *dir;
 470
 471         ret = SP_OK;
 472
 473         DEBUG("Enumerating tty devices");
 474         if (!(dir = opendir("/sys/class/tty")))
 475                 RETURN_FAIL("could not open /sys/class/tty");
 476
 477         DEBUG("Iterating over results");
 478         while (!readdir_r(dir, &entry, &result) && result) {
 479                 len = readlinkat(dirfd(dir), entry.d_name, target, sizeof(target));
 480                 if (len <= 0 || len >= (int) sizeof(target)-1)
 481                         continue;
 482                 target[len] = 0;
 483                 if (strstr(target, "virtual"))
 484                         continue;
 485                 snprintf(name, sizeof(name), "/dev/%s", entry.d_name);
 486                 DEBUG("Found device %s", name);
 487                 if (strstr(target, "serial8250")) {
 488                         /* The serial8250 driver has a hardcoded number of ports.
 489                          * The only way to tell which actually exist on a given system
 490                          * is to try to open them and make an ioctl call. */
 491                         DEBUG("serial8250 device, attempting to open");
 492                         if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
 493                                 DEBUG("open failed, skipping");
 494                                 continue;
 495                         }
 496                         ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
 497                         close(fd);
 498                         if (ioctl_result != 0) {
 499                                 DEBUG("ioctl failed, skipping");
 500                                 continue;
 501                         }
 502                         if (serial_info.type == PORT_UNKNOWN) {
 503                                 DEBUG("port type is unknown, skipping");
 504                                 continue;
 505                         }
 506                 }
 507                 DEBUG("Found port %s", name);
 508                 list = list_append(list, name);
 509                 if (!list) {
 510                         SET_ERROR(ret, SP_ERR_MEM, "list append failed");
 511                         break;
 512                 }
 513         }
 514         closedir(dir);
 515 #endif
 516
 517         switch (ret) {
 518         case SP_OK:
 519                 *list_ptr = list;
 520                 RETURN_OK();
 521         case SP_ERR_SUPP:
 522                 DEBUG_ERROR(SP_ERR_SUPP, "Enumeration not supported on this platform");
 523         default:
 524                 if (list)
 525                         sp_free_port_list(list);
 526                 *list_ptr = NULL;
 527                 return ret;
 528         }
 529 }
 530
 531 void sp_free_port_list(struct sp_port **list)
 532 {
 533         unsigned int i;
 534
 535         TRACE("%p", list);
 536
 537         if (!list) {
 538                 DEBUG("Null list");
 539                 RETURN();
 540         }
 541
 542         DEBUG("Freeing port list");
 543
 544         for (i = 0; list[i]; i++)
 545                 sp_free_port(list[i]);
 546         free(list);
 547
 548         RETURN();
 549 }
 550
 551 #define CHECK_PORT() do { \
 552         if (port == NULL) \
 553                 RETURN_ERROR(SP_ERR_ARG, "Null port"); \
 554         if (port->name == NULL) \
 555                 RETURN_ERROR(SP_ERR_ARG, "Null port name"); \
 556 } while (0)
 557 #ifdef _WIN32
 558 #define CHECK_PORT_HANDLE() do { \
 559         if (port->hdl == INVALID_HANDLE_VALUE) \
 560                 RETURN_ERROR(SP_ERR_ARG, "Invalid port handle"); \
 561 } while (0)
 562 #else
 563 #define CHECK_PORT_HANDLE() do { \
 564         if (port->fd < 0) \
 565                 RETURN_ERROR(SP_ERR_ARG, "Invalid port fd"); \
 566 } while (0)
 567 #endif
 568 #define CHECK_OPEN_PORT() do { \
 569         CHECK_PORT(); \
 570         CHECK_PORT_HANDLE(); \
 571 } while (0)
 572
 573 enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
 574 {
 575         struct port_data data;
 576         struct sp_port_config config;
 577         enum sp_return ret;
 578
 579         TRACE("%p, 0x%x", port, flags);
 580
 581         CHECK_PORT();
 582
 583         if (flags > (SP_MODE_READ | SP_MODE_WRITE))
 584                 RETURN_ERROR(SP_ERR_ARG, "Invalid flags");
 585
 586         DEBUG("Opening port %s", port->name);
 587
 588 #ifdef _WIN32
 589         DWORD desired_access = 0, flags_and_attributes = 0, errors;
 590         char *escaped_port_name;
 591         COMSTAT status;
 592
 593         /* Prefix port name with '\\.\' to work with ports above COM9. */
 594         if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
 595                 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
 596         sprintf(escaped_port_name, "\\\\.\\%s", port->name);
 597
 598         /* Map 'flags' to the OS-specific settings. */
 599         flags_and_attributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED;
 600         if (flags & SP_MODE_READ)
 601                 desired_access |= GENERIC_READ;
 602         if (flags & SP_MODE_WRITE)
 603                 desired_access |= GENERIC_WRITE;
 604
 605         port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0,
 606                          OPEN_EXISTING, flags_and_attributes, 0);
 607
 608         free(escaped_port_name);
 609
 610         if (port->hdl == INVALID_HANDLE_VALUE)
 611                 RETURN_FAIL("port CreateFile() failed");
 612
 613         /* All timeouts initially disabled. */
 614         port->timeouts.ReadIntervalTimeout = 0;
 615         port->timeouts.ReadTotalTimeoutMultiplier = 0;
 616         port->timeouts.ReadTotalTimeoutConstant = 0;
 617         port->timeouts.WriteTotalTimeoutMultiplier = 0;
 618         port->timeouts.WriteTotalTimeoutConstant = 0;
 619
 620         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0) {
 621                 sp_close(port);
 622                 RETURN_FAIL("SetCommTimeouts() failed");
 623         }
 624
 625         /* Prepare OVERLAPPED structures. */
 626 #define INIT_OVERLAPPED(ovl) do { \
 627         memset(&port->ovl, 0, sizeof(port->ovl)); \
 628         port->ovl.hEvent = INVALID_HANDLE_VALUE; \
 629         if ((port->ovl.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL)) \
 630                         == INVALID_HANDLE_VALUE) { \
 631                 sp_close(port); \
 632                 RETURN_FAIL(#ovl "CreateEvent() failed"); \
 633         } \
 634 } while (0)
 635
 636         INIT_OVERLAPPED(read_ovl);
 637         INIT_OVERLAPPED(write_ovl);
 638         INIT_OVERLAPPED(wait_ovl);
 639
 640         /* Set event mask for RX and error events. */
 641         if (SetCommMask(port->hdl, EV_RXCHAR | EV_ERR) == 0) {
 642                 sp_close(port);
 643                 RETURN_FAIL("SetCommMask() failed");
 644         }
 645
 646         /* Start background operation for RX and error events. */
 647         if (WaitCommEvent(port->hdl, &port->events, &port->wait_ovl) == 0) {
 648                 if (GetLastError() != ERROR_IO_PENDING) {
 649                         sp_close(port);
 650                         RETURN_FAIL("WaitCommEvent() failed");
 651                 }
 652         }
 653
 654         port->writing = FALSE;
 655
 656 #else
 657         int flags_local = O_NONBLOCK | O_NOCTTY;
 658
 659         /* Map 'flags' to the OS-specific settings. */
 660         if (flags & (SP_MODE_READ | SP_MODE_WRITE))
 661                 flags_local |= O_RDWR;
 662         else if (flags & SP_MODE_READ)
 663                 flags_local |= O_RDONLY;
 664         else if (flags & SP_MODE_WRITE)
 665                 flags_local |= O_WRONLY;
 666
 667         if ((port->fd = open(port->name, flags_local)) < 0)
 668                 RETURN_FAIL("open() failed");
 669 #endif
 670
 671         ret = get_config(port, &data, &config);
 672
 673         if (ret < 0) {
 674                 sp_close(port);
 675                 RETURN_CODEVAL(ret);
 676         }
 677
 678         /* Set sane port settings. */
 679 #ifdef _WIN32
 680         data.dcb.fBinary = TRUE;
 681         data.dcb.fDsrSensitivity = FALSE;
 682         data.dcb.fErrorChar = FALSE;
 683         data.dcb.fNull = FALSE;
 684         data.dcb.fAbortOnError = TRUE;
 685 #else
 686         /* Turn off all fancy termios tricks, give us a raw channel. */
 687         data.term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IMAXBEL);
 688 #ifdef IUCLC
 689         data.term.c_iflag &= ~IUCLC;
 690 #endif
 691         data.term.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);
 692 #ifdef OLCUC
 693         data.term.c_oflag &= ~OLCUC;
 694 #endif
 695 #ifdef NLDLY
 696         data.term.c_oflag &= ~NLDLY;
 697 #endif
 698 #ifdef CRDLY
 699         data.term.c_oflag &= ~CRDLY;
 700 #endif
 701 #ifdef TABDLY
 702         data.term.c_oflag &= ~TABDLY;
 703 #endif
 704 #ifdef BSDLY
 705         data.term.c_oflag &= ~BSDLY;
 706 #endif
 707 #ifdef VTDLY
 708         data.term.c_oflag &= ~VTDLY;
 709 #endif
 710 #ifdef FFDLY
 711         data.term.c_oflag &= ~FFDLY;
 712 #endif
 713 #ifdef OFILL
 714         data.term.c_oflag &= ~OFILL;
 715 #endif
 716         data.term.c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN);
 717         data.term.c_cc[VMIN] = 0;
 718         data.term.c_cc[VTIME] = 0;
 719
 720         /* Ignore modem status lines; enable receiver; leave control lines alone on close. */
 721         data.term.c_cflag |= (CLOCAL | CREAD | HUPCL);
 722 #endif
 723
 724 #ifdef _WIN32
 725         if (ClearCommError(port->hdl, &errors, &status) == 0)
 726                 RETURN_FAIL("ClearCommError() failed");
 727 #endif
 728
 729         ret = set_config(port, &data, &config);
 730
 731         if (ret < 0) {
 732                 sp_close(port);
 733                 RETURN_CODEVAL(ret);
 734         }
 735
 736         RETURN_OK();
 737 }
 738
 739 enum sp_return sp_close(struct sp_port *port)
 740 {
 741         TRACE("%p", port);
 742
 743         CHECK_OPEN_PORT();
 744
 745         DEBUG("Closing port %s", port->name);
 746
 747 #ifdef _WIN32
 748         /* Returns non-zero upon success, 0 upon failure. */
 749         if (CloseHandle(port->hdl) == 0)
 750                 RETURN_FAIL("port CloseHandle() failed");
 751         port->hdl = INVALID_HANDLE_VALUE;
 752
 753         /* Close event handles for overlapped structures. */
 754 #define CLOSE_OVERLAPPED(ovl) do { \
 755         if (port->ovl.hEvent != INVALID_HANDLE_VALUE && \
 756                 CloseHandle(port->ovl.hEvent) == 0) \
 757                 RETURN_FAIL(# ovl "event CloseHandle() failed"); \
 758 } while (0)
 759         CLOSE_OVERLAPPED(read_ovl);
 760         CLOSE_OVERLAPPED(write_ovl);
 761         CLOSE_OVERLAPPED(wait_ovl);
 762
 763 #else
 764         /* Returns 0 upon success, -1 upon failure. */
 765         if (close(port->fd) == -1)
 766                 RETURN_FAIL("close() failed");
 767         port->fd = -1;
 768 #endif
 769
 770         RETURN_OK();
 771 }
 772
 773 enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers)
 774 {
 775         TRACE("%p, 0x%x", port, buffers);
 776
 777         CHECK_OPEN_PORT();
 778
 779         if (buffers > SP_BUF_BOTH)
 780                 RETURN_ERROR(SP_ERR_ARG, "Invalid buffer selection");
 781
 782         const char *buffer_names[] = {"no", "input", "output", "both"};
 783
 784         DEBUG("Flushing %s buffers on port %s", buffer_names[buffers], port->name);
 785
 786 #ifdef _WIN32
 787         DWORD flags = 0;
 788         if (buffers & SP_BUF_INPUT)
 789                 flags |= PURGE_RXCLEAR;
 790         if (buffers & SP_BUF_OUTPUT)
 791                 flags |= PURGE_TXCLEAR;
 792
 793         /* Returns non-zero upon success, 0 upon failure. */
 794         if (PurgeComm(port->hdl, flags) == 0)
 795                 RETURN_FAIL("PurgeComm() failed");
 796 #else
 797         int flags = 0;
 798         if (buffers & SP_BUF_BOTH)
 799                 flags = TCIOFLUSH;
 800         else if (buffers & SP_BUF_INPUT)
 801                 flags = TCIFLUSH;
 802         else if (buffers & SP_BUF_OUTPUT)
 803                 flags = TCOFLUSH;
 804
 805         /* Returns 0 upon success, -1 upon failure. */
 806         if (tcflush(port->fd, flags) < 0)
 807                 RETURN_FAIL("tcflush() failed");
 808 #endif
 809         RETURN_OK();
 810 }
 811
 812 enum sp_return sp_drain(struct sp_port *port)
 813 {
 814         TRACE("%p", port);
 815
 816         CHECK_OPEN_PORT();
 817
 818         DEBUG("Draining port %s", port->name);
 819
 820 #ifdef _WIN32
 821         /* Returns non-zero upon success, 0 upon failure. */
 822         if (FlushFileBuffers(port->hdl) == 0)
 823                 RETURN_FAIL("FlushFileBuffers() failed");
 824         RETURN_OK();
 825 #else
 826         int result;
 827         while (1) {
 828 #ifdef __ANDROID__
 829                 int arg = 1;
 830                 result = ioctl(port->fd, TCSBRK, &arg);
 831 #else
 832                 result = tcdrain(port->fd);
 833 #endif
 834                 if (result < 0) {
 835                         if (errno == EINTR) {
 836                                 DEBUG("tcdrain() was interrupted");
 837                                 continue;
 838                         } else {
 839                                 RETURN_FAIL("tcdrain() failed");
 840                         }
 841                 } else {
 842                         RETURN_OK();
 843                 }
 844         }
 845 #endif
 846 }
 847
 848 enum sp_return sp_blocking_write(struct sp_port *port, const void *buf, size_t count, unsigned int timeout)
 849 {
 850         TRACE("%p, %p, %d, %d", port, buf, count, timeout);
 851
 852         CHECK_OPEN_PORT();
 853
 854         if (!buf)
 855                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 856
 857         if (timeout)
 858                 DEBUG("Writing %d bytes to port %s, timeout %d ms", count, port->name, timeout);
 859         else
 860                 DEBUG("Writing %d bytes to port %s, no timeout", count, port->name);
 861
 862         if (count == 0)
 863                 RETURN_VALUE("0", 0);
 864
 865 #ifdef _WIN32
 866         DWORD bytes_written = 0;
 867         BOOL result;
 868
 869         /* Wait for previous non-blocking write to complete, if any. */
 870         if (port->writing) {
 871                 DEBUG("Waiting for previous write to complete");
 872                 result = GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
 873                 port->writing = 0;
 874                 if (!result)
 875                         RETURN_FAIL("Previous write failed to complete");
 876                 DEBUG("Previous write completed");
 877         }
 878
 879         /* Set timeout. */
 880         port->timeouts.WriteTotalTimeoutConstant = timeout;
 881         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 882                 RETURN_FAIL("SetCommTimeouts() failed");
 883
 884         /* Start write. */
 885         if (WriteFile(port->hdl, buf, count, NULL, &port->write_ovl) == 0) {
 886                 if (GetLastError() == ERROR_IO_PENDING) {
 887                         DEBUG("Waiting for write to complete");
 888                         GetOverlappedResult(port->hdl, &port->write_ovl, &bytes_written, TRUE);
 889                         DEBUG("Write completed, %d/%d bytes written", bytes_written, count);
 890                         RETURN_VALUE("%d", bytes_written);
 891                 } else {
 892                         RETURN_FAIL("WriteFile() failed");
 893                 }
 894         } else {
 895                 DEBUG("Write completed immediately");
 896                 RETURN_VALUE("%d", count);
 897         }
 898 #else
 899         size_t bytes_written = 0;
 900         unsigned char *ptr = (unsigned char *) buf;
 901         struct timeval start, delta, now, end = {0, 0};
 902         fd_set fds;
 903         int result;
 904
 905         if (timeout) {
 906                 /* Get time at start of operation. */
 907                 gettimeofday(&start, NULL);
 908                 /* Define duration of timeout. */
 909                 delta.tv_sec = timeout / 1000;
 910                 delta.tv_usec = (timeout % 1000) * 1000;
 911                 /* Calculate time at which we should give up. */
 912                 timeradd(&start, &delta, &end);
 913         }
 914
 915         /* Loop until we have written the requested number of bytes. */
 916         while (bytes_written < count)
 917         {
 918                 /* Wait until space is available. */
 919                 FD_ZERO(&fds);
 920                 FD_SET(port->fd, &fds);
 921                 if (timeout) {
 922                         gettimeofday(&now, NULL);
 923                         if (timercmp(&now, &end, >)) {
 924                                 DEBUG("write timed out");
 925                                 RETURN_VALUE("%d", bytes_written);
 926                         }
 927                         timersub(&end, &now, &delta);
 928                 }
 929                 result = select(port->fd + 1, NULL, &fds, NULL, timeout ? &delta : NULL);
 930                 if (result < 0) {
 931                         if (errno == EINTR) {
 932                                 DEBUG("select() call was interrupted, repeating");
 933                                 continue;
 934                         } else {
 935                                 RETURN_FAIL("select() failed");
 936                         }
 937                 } else if (result == 0) {
 938                         DEBUG("write timed out");
 939                         RETURN_VALUE("%d", bytes_written);
 940                 }
 941
 942                 /* Do write. */
 943                 result = write(port->fd, ptr, count - bytes_written);
 944
 945                 if (result < 0) {
 946                         if (errno == EAGAIN)
 947                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
 948                                 continue;
 949                         else
 950                                 /* This is an actual failure. */
 951                                 RETURN_FAIL("write() failed");
 952                 }
 953
 954                 bytes_written += result;
 955                 ptr += result;
 956         }
 957
 958         RETURN_VALUE("%d", bytes_written);
 959 #endif
 960 }
 961
 962 enum sp_return sp_nonblocking_write(struct sp_port *port, const void *buf, size_t count)
 963 {
 964         TRACE("%p, %p, %d", port, buf, count);
 965
 966         CHECK_OPEN_PORT();
 967
 968         if (!buf)
 969                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
 970
 971         DEBUG("Writing up to %d bytes to port %s", count, port->name);
 972
 973         if (count == 0)
 974                 RETURN_VALUE("0", 0);
 975
 976 #ifdef _WIN32
 977         DWORD written = 0;
 978         BYTE *ptr = (BYTE *) buf;
 979
 980         /* Check whether previous write is complete. */
 981         if (port->writing) {
 982                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
 983                         DEBUG("Previous write completed");
 984                         port->writing = 0;
 985                 } else {
 986                         DEBUG("Previous write not complete");
 987                         /* Can't take a new write until the previous one finishes. */
 988                         RETURN_VALUE("0", 0);
 989                 }
 990         }
 991
 992         /* Set timeout. */
 993         port->timeouts.WriteTotalTimeoutConstant = 0;
 994         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
 995                 RETURN_FAIL("SetCommTimeouts() failed");
 996
 997         /* Keep writing data until the OS has to actually start an async IO for it.
 998          * At that point we know the buffer is full. */
 999         while (written < count)
1000         {
1001                 /* Copy first byte of user buffer. */
1002                 port->pending_byte = *ptr++;
1003
1004                 /* Start asynchronous write. */
1005                 if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
1006                         if (GetLastError() == ERROR_IO_PENDING) {
1007                                 if (HasOverlappedIoCompleted(&port->write_ovl)) {
1008                                         DEBUG("Asynchronous write completed immediately");
1009                                         port->writing = 0;
1010                                         written++;
1011                                         continue;
1012                                 } else {
1013                                         DEBUG("Asynchronous write running");
1014                                         port->writing = 1;
1015                                         RETURN_VALUE("%d", ++written);
1016                                 }
1017                         } else {
1018                                 /* Actual failure of some kind. */
1019                                 RETURN_FAIL("WriteFile() failed");
1020                         }
1021                 } else {
1022                         DEBUG("Single byte written immediately");
1023                         written++;
1024                 }
1025         }
1026
1027         DEBUG("All bytes written immediately");
1028
1029         RETURN_VALUE("%d", written);
1030 #else
1031         /* Returns the number of bytes written, or -1 upon failure. */
1032         ssize_t written = write(port->fd, buf, count);
1033
1034         if (written < 0)
1035                 RETURN_FAIL("write() failed");
1036         else
1037                 RETURN_VALUE("%d", written);
1038 #endif
1039 }
1040
1041 enum sp_return sp_blocking_read(struct sp_port *port, void *buf, size_t count, unsigned int timeout)
1042 {
1043         TRACE("%p, %p, %d, %d", port, buf, count, timeout);
1044
1045         CHECK_OPEN_PORT();
1046
1047         if (!buf)
1048                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1049
1050         if (timeout)
1051                 DEBUG("Reading %d bytes from port %s, timeout %d ms", count, port->name, timeout);
1052         else
1053                 DEBUG("Reading %d bytes from port %s, no timeout", count, port->name);
1054
1055         if (count == 0)
1056                 RETURN_VALUE("0", 0);
1057
1058 #ifdef _WIN32
1059         DWORD bytes_read = 0;
1060
1061         /* Set timeout. */
1062         port->timeouts.ReadIntervalTimeout = 0;
1063         port->timeouts.ReadTotalTimeoutConstant = timeout;
1064         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1065                 RETURN_FAIL("SetCommTimeouts() failed");
1066
1067         /* Start read. */
1068         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0) {
1069                 if (GetLastError() == ERROR_IO_PENDING) {
1070                         DEBUG("Waiting for read to complete");
1071                         GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE);
1072                         DEBUG("Read completed, %d/%d bytes read", bytes_read, count);
1073                 } else {
1074                         RETURN_FAIL("ReadFile() failed");
1075                 }
1076         } else {
1077                 DEBUG("Read completed immediately");
1078                 bytes_read = count;
1079         }
1080
1081         /* Start background operation for subsequent events. */
1082         if (WaitCommEvent(port->hdl, &port->events, &port->wait_ovl) == 0) {
1083                 if (GetLastError() != ERROR_IO_PENDING)
1084                         RETURN_FAIL("WaitCommEvent() failed");
1085         }
1086
1087         RETURN_VALUE("%d", bytes_read);
1088
1089 #else
1090         size_t bytes_read = 0;
1091         unsigned char *ptr = (unsigned char *) buf;
1092         struct timeval start, delta, now, end = {0, 0};
1093         fd_set fds;
1094         int result;
1095
1096         if (timeout) {
1097                 /* Get time at start of operation. */
1098                 gettimeofday(&start, NULL);
1099                 /* Define duration of timeout. */
1100                 delta.tv_sec = timeout / 1000;
1101                 delta.tv_usec = (timeout % 1000) * 1000;
1102                 /* Calculate time at which we should give up. */
1103                 timeradd(&start, &delta, &end);
1104         }
1105
1106         /* Loop until we have the requested number of bytes. */
1107         while (bytes_read < count)
1108         {
1109                 /* Wait until data is available. */
1110                 FD_ZERO(&fds);
1111                 FD_SET(port->fd, &fds);
1112                 if (timeout) {
1113                         gettimeofday(&now, NULL);
1114                         if (timercmp(&now, &end, >))
1115                                 /* Timeout has expired. */
1116                                 RETURN_VALUE("%d", bytes_read);
1117                         timersub(&end, &now, &delta);
1118                 }
1119                 result = select(port->fd + 1, &fds, NULL, NULL, timeout ? &delta : NULL);
1120                 if (result < 0) {
1121                         if (errno == EINTR) {
1122                                 DEBUG("select() call was interrupted, repeating");
1123                                 continue;
1124                         } else {
1125                                 RETURN_FAIL("select() failed");
1126                         }
1127                 } else if (result == 0) {
1128                         DEBUG("read timed out");
1129                         RETURN_VALUE("%d", bytes_read);
1130                 }
1131
1132                 /* Do read. */
1133                 result = read(port->fd, ptr, count - bytes_read);
1134
1135                 if (result < 0) {
1136                         if (errno == EAGAIN)
1137                                 /* This shouldn't happen because we did a select() first, but handle anyway. */
1138                                 continue;
1139                         else
1140                                 /* This is an actual failure. */
1141                                 RETURN_FAIL("read() failed");
1142                 }
1143
1144                 bytes_read += result;
1145                 ptr += result;
1146         }
1147
1148         RETURN_VALUE("%d", bytes_read);
1149 #endif
1150 }
1151
1152 enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf, size_t count)
1153 {
1154         TRACE("%p, %p, %d", port, buf, count);
1155
1156         CHECK_OPEN_PORT();
1157
1158         if (!buf)
1159                 RETURN_ERROR(SP_ERR_ARG, "Null buffer");
1160
1161         DEBUG("Reading up to %d bytes from port %s", count, port->name);
1162
1163 #ifdef _WIN32
1164         DWORD bytes_read;
1165
1166         /* Set timeout. */
1167         port->timeouts.ReadIntervalTimeout = MAXDWORD;
1168         port->timeouts.ReadTotalTimeoutConstant = 0;
1169         if (SetCommTimeouts(port->hdl, &port->timeouts) == 0)
1170                 RETURN_FAIL("SetCommTimeouts() failed");
1171
1172         /* Do read. */
1173         if (ReadFile(port->hdl, buf, count, NULL, &port->read_ovl) == 0)
1174                 RETURN_FAIL("ReadFile() failed");
1175
1176         /* Get number of bytes read. */
1177         if (GetOverlappedResult(port->hdl, &port->read_ovl, &bytes_read, TRUE) == 0)
1178                 RETURN_FAIL("GetOverlappedResult() failed");
1179
1180         if (bytes_read > 0) {
1181                 /* Start background operation for subsequent events. */
1182                 if (WaitCommEvent(port->hdl, &port->events, &port->wait_ovl) == 0) {
1183                         if (GetLastError() != ERROR_IO_PENDING)
1184                                 RETURN_FAIL("WaitCommEvent() failed");
1185                 }
1186         }
1187
1188         RETURN_VALUE("%d", bytes_read);
1189 #else
1190         ssize_t bytes_read;
1191
1192         /* Returns the number of bytes read, or -1 upon failure. */
1193         if ((bytes_read = read(port->fd, buf, count)) < 0) {
1194                 if (errno == EAGAIN)
1195                         /* No bytes available. */
1196                         bytes_read = 0;
1197                 else
1198                         /* This is an actual failure. */
1199                         RETURN_FAIL("read() failed");
1200         }
1201         RETURN_VALUE("%d", bytes_read);
1202 #endif
1203 }
1204
1205 enum sp_return sp_input_waiting(struct sp_port *port)
1206 {
1207         TRACE("%p", port);
1208
1209         CHECK_OPEN_PORT();
1210
1211         DEBUG("Checking input bytes waiting on port %s", port->name);
1212
1213 #ifdef _WIN32
1214         DWORD errors;
1215         COMSTAT comstat;
1216
1217         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1218                 RETURN_FAIL("ClearCommError() failed");
1219         RETURN_VALUE("%d", comstat.cbInQue);
1220 #else
1221         int bytes_waiting;
1222         if (ioctl(port->fd, TIOCINQ, &bytes_waiting) < 0)
1223                 RETURN_FAIL("TIOCINQ ioctl failed");
1224         RETURN_VALUE("%d", bytes_waiting);
1225 #endif
1226 }
1227
1228 enum sp_return sp_output_waiting(struct sp_port *port)
1229 {
1230         TRACE("%p", port);
1231
1232         CHECK_OPEN_PORT();
1233
1234         DEBUG("Checking output bytes waiting on port %s", port->name);
1235
1236 #ifdef _WIN32
1237         DWORD errors;
1238         COMSTAT comstat;
1239
1240         if (ClearCommError(port->hdl, &errors, &comstat) == 0)
1241                 RETURN_FAIL("ClearCommError() failed");
1242         RETURN_VALUE("%d", comstat.cbOutQue);
1243 #else
1244         int bytes_waiting;
1245         if (ioctl(port->fd, TIOCOUTQ, &bytes_waiting) < 0)
1246                 RETURN_FAIL("TIOCOUTQ ioctl failed");
1247         RETURN_VALUE("%d", bytes_waiting);
1248 #endif
1249 }
1250
1251 enum sp_return sp_new_event_set(struct sp_event_set **result_ptr)
1252 {
1253         struct sp_event_set *result;
1254
1255         TRACE("%p", result_ptr);
1256
1257         if (!result_ptr)
1258                 RETURN_ERROR(SP_ERR_ARG, "Null result");
1259
1260         *result_ptr = NULL;
1261
1262         if (!(result = malloc(sizeof(struct sp_event_set))))
1263                 RETURN_ERROR(SP_ERR_MEM, "sp_event_set malloc() failed");
1264
1265         memset(result, 0, sizeof(struct sp_event_set));
1266
1267         *result_ptr = result;
1268
1269         RETURN_OK();
1270 }
1271
1272 static enum sp_return add_handle(struct sp_event_set *event_set,
1273                 event_handle handle, enum sp_event mask)
1274 {
1275         void *new_handles;
1276         enum sp_event *new_masks;
1277
1278         TRACE("%p, %d, %d", event_set, handle, mask);
1279
1280         if (!(new_handles = realloc(event_set->handles,
1281                         sizeof(event_handle) * (event_set->count + 1))))
1282                 RETURN_ERROR(SP_ERR_MEM, "handle array realloc() failed");
1283
1284         if (!(new_masks = realloc(event_set->masks,
1285                         sizeof(enum sp_event) * (event_set->count + 1))))
1286                 RETURN_ERROR(SP_ERR_MEM, "mask array realloc() failed");
1287
1288         event_set->handles = new_handles;
1289         event_set->masks = new_masks;
1290
1291         ((event_handle *) event_set->handles)[event_set->count] = handle;
1292         event_set->masks[event_set->count] = mask;
1293
1294         event_set->count++;
1295
1296         RETURN_OK();
1297 }
1298
1299 enum sp_return sp_add_port_events(struct sp_event_set *event_set,
1300         const struct sp_port *port, enum sp_event mask)
1301 {
1302         TRACE("%p, %p, %d", event_set, port, mask);
1303
1304         if (!event_set)
1305                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1306
1307         if (!port)
1308                 RETURN_ERROR(SP_ERR_ARG, "Null port");
1309
1310         if (mask > (SP_EVENT_RX_READY | SP_EVENT_TX_READY | SP_EVENT_ERROR))
1311                 RETURN_ERROR(SP_ERR_ARG, "Invalid event mask");
1312
1313         if (!mask)
1314                 RETURN_OK();
1315
1316 #ifdef _WIN32
1317         enum sp_event handle_mask;
1318         if ((handle_mask = mask & SP_EVENT_TX_READY))
1319                 TRY(add_handle(event_set, port->write_ovl.hEvent, handle_mask));
1320         if ((handle_mask = mask & (SP_EVENT_RX_READY | SP_EVENT_ERROR)))
1321                 TRY(add_handle(event_set, port->wait_ovl.hEvent, handle_mask));
1322 #else
1323         TRY(add_handle(event_set, port->fd, mask));
1324 #endif
1325
1326         RETURN_OK();
1327 }
1328
1329 void sp_free_event_set(struct sp_event_set *event_set)
1330 {
1331         TRACE("%p", event_set);
1332
1333         if (!event_set) {
1334                 DEBUG("Null event set");
1335                 RETURN();
1336         }
1337
1338         DEBUG("Freeing event set");
1339
1340         if (event_set->handles)
1341                 free(event_set->handles);
1342         if (event_set->masks)
1343                 free(event_set->masks);
1344
1345         free(event_set);
1346
1347         RETURN();
1348 }
1349
1350 enum sp_return sp_wait(struct sp_event_set *event_set, unsigned int timeout)
1351 {
1352         TRACE("%p, %d", event_set, timeout);
1353
1354         if (!event_set)
1355                 RETURN_ERROR(SP_ERR_ARG, "Null event set");
1356
1357 #ifdef _WIN32
1358         if (WaitForMultipleObjects(event_set->count, event_set->handles, FALSE,
1359                         timeout ? timeout : INFINITE) == WAIT_FAILED)
1360                 RETURN_FAIL("WaitForMultipleObjects() failed");
1361
1362         RETURN_OK();
1363 #else
1364         struct timeval start, delta, now, end = {0, 0};
1365         int result, timeout_remaining;
1366         struct pollfd *pollfds;
1367         unsigned int i;
1368
1369         if (!(pollfds = malloc(sizeof(struct pollfd) * event_set->count)))
1370                 RETURN_ERROR(SP_ERR_MEM, "pollfds malloc() failed");
1371
1372         for (i = 0; i < event_set->count; i++) {
1373                 pollfds[i].fd = ((int *) event_set->handles)[i];
1374                 pollfds[i].events = 0;
1375                 pollfds[i].revents = 0;
1376                 if (event_set->masks[i] & SP_EVENT_RX_READY)
1377                         pollfds[i].events |= POLLIN;
1378                 if (event_set->masks[i] & SP_EVENT_TX_READY)
1379                         pollfds[i].events |= POLLOUT;
1380                 if (event_set->masks[i] & SP_EVENT_ERROR)
1381                         pollfds[i].events |= POLLERR;
1382         }
1383
1384         if (timeout) {
1385                 /* Get time at start of operation. */
1386                 gettimeofday(&start, NULL);
1387                 /* Define duration of timeout. */
1388                 delta.tv_sec = timeout / 1000;
1389                 delta.tv_usec = (timeout % 1000) * 1000;
1390                 /* Calculate time at which we should give up. */
1391                 timeradd(&start, &delta, &end);
1392         }
1393
1394         /* Loop until an event occurs. */
1395         while (1)
1396         {
1397                 if (timeout) {
1398                         gettimeofday(&now, NULL);
1399                         if (timercmp(&now, &end, >)) {
1400                                 DEBUG("wait timed out");
1401                                 break;
1402                         }
1403                         timersub(&end, &now, &delta);
1404                         timeout_remaining = delta.tv_sec * 1000 + delta.tv_usec / 1000;
1405                 }
1406
1407                 result = poll(pollfds, event_set->count, timeout ? timeout_remaining : -1);
1408
1409                 if (result < 0) {
1410                         if (errno == EINTR) {
1411                                 DEBUG("poll() call was interrupted, repeating");
1412                                 continue;
1413                         } else {
1414                                 free(pollfds);
1415                                 RETURN_FAIL("poll() failed");
1416                         }
1417                 } else if (result == 0) {
1418                         DEBUG("poll() timed out");
1419                         break;
1420                 } else {
1421                         DEBUG("poll() completed");
1422                         break;
1423                 }
1424         }
1425
1426         free(pollfds);
1427         RETURN_OK();
1428 #endif
1429 }
1430
1431 #ifdef USE_TERMIOS_SPEED
1432 static enum sp_return get_baudrate(int fd, int *baudrate)
1433 {
1434         void *data;
1435
1436         TRACE("%d, %p", fd, baudrate);
1437
1438         DEBUG("Getting baud rate");
1439
1440         if (!(data = malloc(get_termios_size())))
1441                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1442
1443         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1444                 free(data);
1445                 RETURN_FAIL("getting termios failed");
1446         }
1447
1448         *baudrate = get_termios_speed(data);
1449
1450         free(data);
1451
1452         RETURN_OK();
1453 }
1454
1455 static enum sp_return set_baudrate(int fd, int baudrate)
1456 {
1457         void *data;
1458
1459         TRACE("%d, %d", fd, baudrate);
1460
1461         DEBUG("Getting baud rate");
1462
1463         if (!(data = malloc(get_termios_size())))
1464                 RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
1465
1466         if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
1467                 free(data);
1468                 RETURN_FAIL("getting termios failed");
1469         }
1470
1471         DEBUG("Setting baud rate");
1472
1473         set_termios_speed(data, baudrate);
1474
1475         if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
1476                 free(data);
1477                 RETURN_FAIL("setting termios failed");
1478         }
1479
1480         free(data);
1481
1482         RETURN_OK();
1483 }
1484 #endif /* USE_TERMIOS_SPEED */
1485
1486 #ifdef USE_TERMIOX
1487 static enum sp_return get_flow(int fd, struct port_data *data)
1488 {
1489         void *termx;
1490
1491         TRACE("%d, %p", fd, data);
1492
1493         DEBUG("Getting advanced flow control");
1494
1495         if (!(termx = malloc(get_termiox_size())))
1496                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1497
1498         if (ioctl(fd, TCGETX, termx) < 0) {
1499                 free(termx);
1500                 RETURN_FAIL("getting termiox failed");
1501         }
1502
1503         get_termiox_flow(termx, &data->rts_flow, &data->cts_flow,
1504                         &data->dtr_flow, &data->dsr_flow);
1505
1506         free(termx);
1507
1508         RETURN_OK();
1509 }
1510
1511 static enum sp_return set_flow(int fd, struct port_data *data)
1512 {
1513         void *termx;
1514
1515         TRACE("%d, %p", fd, data);
1516
1517         DEBUG("Getting advanced flow control");
1518
1519         if (!(termx = malloc(get_termiox_size())))
1520                 RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
1521
1522         if (ioctl(fd, TCGETX, termx) < 0) {
1523                 free(termx);
1524                 RETURN_FAIL("getting termiox failed");
1525         }
1526
1527         DEBUG("Setting advanced flow control");
1528
1529         set_termiox_flow(termx, data->rts_flow, data->cts_flow,
1530                         data->dtr_flow, data->dsr_flow);
1531
1532         if (ioctl(fd, TCSETX, termx) < 0) {
1533                 free(termx);
1534                 RETURN_FAIL("setting termiox failed");
1535         }
1536
1537         free(termx);
1538
1539         RETURN_OK();
1540 }
1541 #endif /* USE_TERMIOX */
1542
1543 static enum sp_return get_config(struct sp_port *port, struct port_data *data,
1544         struct sp_port_config *config)
1545 {
1546         unsigned int i;
1547
1548         TRACE("%p, %p, %p", port, data, config);
1549
1550         DEBUG("Getting configuration for port %s", port->name);
1551
1552 #ifdef _WIN32
1553         if (!GetCommState(port->hdl, &data->dcb))
1554                 RETURN_FAIL("GetCommState() failed");
1555
1556         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1557                 if (data->dcb.BaudRate == std_baudrates[i].index) {
1558                         config->baudrate = std_baudrates[i].value;
1559                         break;
1560                 }
1561         }
1562
1563         if (i == NUM_STD_BAUDRATES)
1564                 /* BaudRate field can be either an index or a custom baud rate. */
1565                 config->baudrate = data->dcb.BaudRate;
1566
1567         config->bits = data->dcb.ByteSize;
1568
1569         if (data->dcb.fParity)
1570                 switch (data->dcb.Parity) {
1571                 case NOPARITY:
1572                         config->parity = SP_PARITY_NONE;
1573                         break;
1574                 case ODDPARITY:
1575                         config->parity = SP_PARITY_ODD;
1576                         break;
1577                 case EVENPARITY:
1578                         config->parity = SP_PARITY_EVEN;
1579                         break;
1580                 case MARKPARITY:
1581                         config->parity = SP_PARITY_MARK;
1582                         break;
1583                 case SPACEPARITY:
1584                         config->parity = SP_PARITY_SPACE;
1585                         break;
1586                 default:
1587                         config->parity = -1;
1588                 }
1589         else
1590                 config->parity = SP_PARITY_NONE;
1591
1592         switch (data->dcb.StopBits) {
1593         case ONESTOPBIT:
1594                 config->stopbits = 1;
1595                 break;
1596         case TWOSTOPBITS:
1597                 config->stopbits = 2;
1598                 break;
1599         default:
1600                 config->stopbits = -1;
1601         }
1602
1603         switch (data->dcb.fRtsControl) {
1604         case RTS_CONTROL_DISABLE:
1605                 config->rts = SP_RTS_OFF;
1606                 break;
1607         case RTS_CONTROL_ENABLE:
1608                 config->rts = SP_RTS_ON;
1609                 break;
1610         case RTS_CONTROL_HANDSHAKE:
1611                 config->rts = SP_RTS_FLOW_CONTROL;
1612                 break;
1613         default:
1614                 config->rts = -1;
1615         }
1616
1617         config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1618
1619         switch (data->dcb.fDtrControl) {
1620         case DTR_CONTROL_DISABLE:
1621                 config->dtr = SP_DTR_OFF;
1622                 break;
1623         case DTR_CONTROL_ENABLE:
1624                 config->dtr = SP_DTR_ON;
1625                 break;
1626         case DTR_CONTROL_HANDSHAKE:
1627                 config->dtr = SP_DTR_FLOW_CONTROL;
1628                 break;
1629         default:
1630                 config->dtr = -1;
1631         }
1632
1633         config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1634
1635         if (data->dcb.fInX) {
1636                 if (data->dcb.fOutX)
1637                         config->xon_xoff = SP_XONXOFF_INOUT;
1638                 else
1639                         config->xon_xoff = SP_XONXOFF_IN;
1640         } else {
1641                 if (data->dcb.fOutX)
1642                         config->xon_xoff = SP_XONXOFF_OUT;
1643                 else
1644                         config->xon_xoff = SP_XONXOFF_DISABLED;
1645         }
1646
1647 #else // !_WIN32
1648
1649         if (tcgetattr(port->fd, &data->term) < 0)
1650                 RETURN_FAIL("tcgetattr() failed");
1651
1652         if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
1653                 RETURN_FAIL("TIOCMGET ioctl failed");
1654
1655 #ifdef USE_TERMIOX
1656         int ret = get_flow(port->fd, data);
1657
1658         if (ret == SP_ERR_FAIL && errno == EINVAL)
1659                 data->termiox_supported = 0;
1660         else if (ret < 0)
1661                 RETURN_CODEVAL(ret);
1662         else
1663                 data->termiox_supported = 1;
1664 #else
1665         data->termiox_supported = 0;
1666 #endif
1667
1668         for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1669                 if (cfgetispeed(&data->term) == std_baudrates[i].index) {
1670                         config->baudrate = std_baudrates[i].value;
1671                         break;
1672                 }
1673         }
1674
1675         if (i == NUM_STD_BAUDRATES) {
1676 #ifdef __APPLE__
1677                 config->baudrate = (int)data->term.c_ispeed;
1678 #elif defined(USE_TERMIOS_SPEED)
1679                 TRY(get_baudrate(port->fd, &config->baudrate));
1680 #else
1681                 config->baudrate = -1;
1682 #endif
1683         }
1684
1685         switch (data->term.c_cflag & CSIZE) {
1686         case CS8:
1687                 config->bits = 8;
1688                 break;
1689         case CS7:
1690                 config->bits = 7;
1691                 break;
1692         case CS6:
1693                 config->bits = 6;
1694                 break;
1695         case CS5:
1696                 config->bits = 5;
1697                 break;
1698         default:
1699                 config->bits = -1;
1700         }
1701
1702         if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
1703                 config->parity = SP_PARITY_NONE;
1704         else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
1705                 config->parity = -1;
1706 #ifdef CMSPAR
1707         else if (data->term.c_cflag & CMSPAR)
1708                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_MARK : SP_PARITY_SPACE;
1709 #endif
1710         else
1711                 config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
1712
1713         config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
1714
1715         if (data->term.c_cflag & CRTSCTS) {
1716                 config->rts = SP_RTS_FLOW_CONTROL;
1717                 config->cts = SP_CTS_FLOW_CONTROL;
1718         } else {
1719                 if (data->termiox_supported && data->rts_flow)
1720                         config->rts = SP_RTS_FLOW_CONTROL;
1721                 else
1722                         config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
1723
1724                 config->cts = (data->termiox_supported && data->cts_flow) ?
1725                         SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
1726         }
1727
1728         if (data->termiox_supported && data->dtr_flow)
1729                 config->dtr = SP_DTR_FLOW_CONTROL;
1730         else
1731                 config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
1732
1733         config->dsr = (data->termiox_supported && data->dsr_flow) ?
1734                 SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
1735
1736         if (data->term.c_iflag & IXOFF) {
1737                 if (data->term.c_iflag & IXON)
1738                         config->xon_xoff = SP_XONXOFF_INOUT;
1739                 else
1740                         config->xon_xoff = SP_XONXOFF_IN;
1741         } else {
1742                 if (data->term.c_iflag & IXON)
1743                         config->xon_xoff = SP_XONXOFF_OUT;
1744                 else
1745                         config->xon_xoff = SP_XONXOFF_DISABLED;
1746         }
1747 #endif
1748
1749         RETURN_OK();
1750 }
1751
1752 static enum sp_return set_config(struct sp_port *port, struct port_data *data,
1753         const struct sp_port_config *config)
1754 {
1755         unsigned int i;
1756 #ifdef __APPLE__
1757         BAUD_TYPE baud_nonstd;
1758
1759         baud_nonstd = B0;
1760 #endif
1761 #ifdef USE_TERMIOS_SPEED
1762         int baud_nonstd = 0;
1763 #endif
1764
1765         TRACE("%p, %p, %p", port, data, config);
1766
1767         DEBUG("Setting configuration for port %s", port->name);
1768
1769 #ifdef _WIN32
1770         if (config->baudrate >= 0) {
1771                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1772                         if (config->baudrate == std_baudrates[i].value) {
1773                                 data->dcb.BaudRate = std_baudrates[i].index;
1774                                 break;
1775                         }
1776                 }
1777
1778                 if (i == NUM_STD_BAUDRATES)
1779                         data->dcb.BaudRate = config->baudrate;
1780         }
1781
1782         if (config->bits >= 0)
1783                 data->dcb.ByteSize = config->bits;
1784
1785         if (config->parity >= 0) {
1786                 switch (config->parity) {
1787                 case SP_PARITY_NONE:
1788                         data->dcb.Parity = NOPARITY;
1789                         break;
1790                 case SP_PARITY_ODD:
1791                         data->dcb.Parity = ODDPARITY;
1792                         break;
1793                 case SP_PARITY_EVEN:
1794                         data->dcb.Parity = EVENPARITY;
1795                         break;
1796                 case SP_PARITY_MARK:
1797                         data->dcb.Parity = MARKPARITY;
1798                         break;
1799                 case SP_PARITY_SPACE:
1800                         data->dcb.Parity = SPACEPARITY;
1801                         break;
1802                 default:
1803                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1804                 }
1805         }
1806
1807         if (config->stopbits >= 0) {
1808                 switch (config->stopbits) {
1809                 /* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
1810                 case 1:
1811                         data->dcb.StopBits = ONESTOPBIT;
1812                         break;
1813                 case 2:
1814                         data->dcb.StopBits = TWOSTOPBITS;
1815                         break;
1816                 default:
1817                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bit setting");
1818                 }
1819         }
1820
1821         if (config->rts >= 0) {
1822                 switch (config->rts) {
1823                 case SP_RTS_OFF:
1824                         data->dcb.fRtsControl = RTS_CONTROL_DISABLE;
1825                         break;
1826                 case SP_RTS_ON:
1827                         data->dcb.fRtsControl = RTS_CONTROL_ENABLE;
1828                         break;
1829                 case SP_RTS_FLOW_CONTROL:
1830                         data->dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
1831                         break;
1832                 default:
1833                         RETURN_ERROR(SP_ERR_ARG, "Invalid RTS setting");
1834                 }
1835         }
1836
1837         if (config->cts >= 0) {
1838                 switch (config->cts) {
1839                 case SP_CTS_IGNORE:
1840                         data->dcb.fOutxCtsFlow = FALSE;
1841                         break;
1842                 case SP_CTS_FLOW_CONTROL:
1843                         data->dcb.fOutxCtsFlow = TRUE;
1844                         break;
1845                 default:
1846                         RETURN_ERROR(SP_ERR_ARG, "Invalid CTS setting");
1847                 }
1848         }
1849
1850         if (config->dtr >= 0) {
1851                 switch (config->dtr) {
1852                 case SP_DTR_OFF:
1853                         data->dcb.fDtrControl = DTR_CONTROL_DISABLE;
1854                         break;
1855                 case SP_DTR_ON:
1856                         data->dcb.fDtrControl = DTR_CONTROL_ENABLE;
1857                         break;
1858                 case SP_DTR_FLOW_CONTROL:
1859                         data->dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
1860                         break;
1861                 default:
1862                         RETURN_ERROR(SP_ERR_ARG, "Invalid DTR setting");
1863                 }
1864         }
1865
1866         if (config->dsr >= 0) {
1867                 switch (config->dsr) {
1868                 case SP_DSR_IGNORE:
1869                         data->dcb.fOutxDsrFlow = FALSE;
1870                         break;
1871                 case SP_DSR_FLOW_CONTROL:
1872                         data->dcb.fOutxDsrFlow = TRUE;
1873                         break;
1874                 default:
1875                         RETURN_ERROR(SP_ERR_ARG, "Invalid DSR setting");
1876                 }
1877         }
1878
1879         if (config->xon_xoff >= 0) {
1880                 switch (config->xon_xoff) {
1881                 case SP_XONXOFF_DISABLED:
1882                         data->dcb.fInX = FALSE;
1883                         data->dcb.fOutX = FALSE;
1884                         break;
1885                 case SP_XONXOFF_IN:
1886                         data->dcb.fInX = TRUE;
1887                         data->dcb.fOutX = FALSE;
1888                         break;
1889                 case SP_XONXOFF_OUT:
1890                         data->dcb.fInX = FALSE;
1891                         data->dcb.fOutX = TRUE;
1892                         break;
1893                 case SP_XONXOFF_INOUT:
1894                         data->dcb.fInX = TRUE;
1895                         data->dcb.fOutX = TRUE;
1896                         break;
1897                 default:
1898                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
1899                 }
1900         }
1901
1902         if (!SetCommState(port->hdl, &data->dcb))
1903                 RETURN_FAIL("SetCommState() failed");
1904
1905 #else /* !_WIN32 */
1906
1907         int controlbits;
1908
1909         if (config->baudrate >= 0) {
1910                 for (i = 0; i < NUM_STD_BAUDRATES; i++) {
1911                         if (config->baudrate == std_baudrates[i].value) {
1912                                 if (cfsetospeed(&data->term, std_baudrates[i].index) < 0)
1913                                         RETURN_FAIL("cfsetospeed() failed");
1914
1915                                 if (cfsetispeed(&data->term, std_baudrates[i].index) < 0)
1916                                         RETURN_FAIL("cfsetispeed() failed");
1917                                 break;
1918                         }
1919                 }
1920
1921                 /* Non-standard baud rate */
1922                 if (i == NUM_STD_BAUDRATES) {
1923 #ifdef __APPLE__
1924                         /* Set "dummy" baud rate. */
1925                         if (cfsetspeed(&data->term, B9600) < 0)
1926                                 RETURN_FAIL("cfsetspeed() failed");
1927                         baud_nonstd = config->baudrate;
1928 #elif defined(USE_TERMIOS_SPEED)
1929                         baud_nonstd = 1;
1930 #else
1931                         RETURN_ERROR(SP_ERR_SUPP, "Non-standard baudrate not supported");
1932 #endif
1933                 }
1934         }
1935
1936         if (config->bits >= 0) {
1937                 data->term.c_cflag &= ~CSIZE;
1938                 switch (config->bits) {
1939                 case 8:
1940                         data->term.c_cflag |= CS8;
1941                         break;
1942                 case 7:
1943                         data->term.c_cflag |= CS7;
1944                         break;
1945                 case 6:
1946                         data->term.c_cflag |= CS6;
1947                         break;
1948                 case 5:
1949                         data->term.c_cflag |= CS5;
1950                         break;
1951                 default:
1952                         RETURN_ERROR(SP_ERR_ARG, "Invalid data bits setting");
1953                 }
1954         }
1955
1956         if (config->parity >= 0) {
1957                 data->term.c_iflag &= ~IGNPAR;
1958                 data->term.c_cflag &= ~(PARENB | PARODD);
1959 #ifdef CMSPAR
1960                 data->term.c_cflag &= ~CMSPAR;
1961 #endif
1962                 switch (config->parity) {
1963                 case SP_PARITY_NONE:
1964                         data->term.c_iflag |= IGNPAR;
1965                         break;
1966                 case SP_PARITY_EVEN:
1967                         data->term.c_cflag |= PARENB;
1968                         break;
1969                 case SP_PARITY_ODD:
1970                         data->term.c_cflag |= PARENB | PARODD;
1971                         break;
1972 #ifdef CMSPAR
1973                 case SP_PARITY_MARK:
1974                         data->term.c_cflag |= PARENB | PARODD;
1975                         data->term.c_cflag |= CMSPAR;
1976                         break;
1977                 case SP_PARITY_SPACE:
1978                         data->term.c_cflag |= PARENB;
1979                         data->term.c_cflag |= CMSPAR;
1980                         break;
1981 #else
1982                 case SP_PARITY_MARK:
1983                 case SP_PARITY_SPACE:
1984                         RETURN_ERROR(SP_ERR_SUPP, "Mark/space parity not supported");
1985 #endif
1986                 default:
1987                         RETURN_ERROR(SP_ERR_ARG, "Invalid parity setting");
1988                 }
1989         }
1990
1991         if (config->stopbits >= 0) {
1992                 data->term.c_cflag &= ~CSTOPB;
1993                 switch (config->stopbits) {
1994                 case 1:
1995                         data->term.c_cflag &= ~CSTOPB;
1996                         break;
1997                 case 2:
1998                         data->term.c_cflag |= CSTOPB;
1999                         break;
2000                 default:
2001                         RETURN_ERROR(SP_ERR_ARG, "Invalid stop bits setting");
2002                 }
2003         }
2004
2005         if (config->rts >= 0 || config->cts >= 0) {
2006                 if (data->termiox_supported) {
2007                         data->rts_flow = data->cts_flow = 0;
2008                         switch (config->rts) {
2009                         case SP_RTS_OFF:
2010                         case SP_RTS_ON:
2011                                 controlbits = TIOCM_RTS;
2012                                 if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
2013                                         RETURN_FAIL("Setting RTS signal level failed");
2014                                 break;
2015                         case SP_RTS_FLOW_CONTROL:
2016                                 data->rts_flow = 1;
2017                                 break;
2018                         default:
2019                                 break;
2020                         }
2021                         if (config->cts == SP_CTS_FLOW_CONTROL)
2022                                 data->cts_flow = 1;
2023
2024                         if (data->rts_flow && data->cts_flow)
2025                                 data->term.c_iflag |= CRTSCTS;
2026                         else
2027                                 data->term.c_iflag &= ~CRTSCTS;
2028                 } else {
2029                         /* Asymmetric use of RTS/CTS not supported. */
2030                         if (data->term.c_iflag & CRTSCTS) {
2031                                 /* Flow control can only be disabled for both RTS & CTS together. */
2032                                 if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
2033                                         if (config->cts != SP_CTS_IGNORE)
2034                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
2035                                 }
2036                                 if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
2037                                         if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
2038                                                 RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be disabled together");
2039                                 }
2040                         } else {
2041                                 /* Flow control can only be enabled for both RTS & CTS together. */
2042                                 if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
2043                                         ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
2044                                         RETURN_ERROR(SP_ERR_SUPP, "RTS & CTS flow control must be enabled together");
2045                         }
2046
2047                         if (config->rts >= 0) {
2048                                 if (config->rts == SP_RTS_FLOW_CONTROL) {
2049                                         data->term.c_iflag |= CRTSCTS;
2050                                 } else {
2051                                         controlbits = TIOCM_RTS;
2052                                         if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
2053                                                         &controlbits) < 0)
2054                                                 RETURN_FAIL("Setting RTS signal level failed");
2055                                 }
2056                         }
2057                 }
2058         }
2059
2060         if (config->dtr >= 0 || config->dsr >= 0) {
2061                 if (data->termiox_supported) {
2062                         data->dtr_flow = data->dsr_flow = 0;
2063                         switch (config->dtr) {
2064                         case SP_DTR_OFF:
2065                         case SP_DTR_ON:
2066                                 controlbits = TIOCM_DTR;
2067                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
2068                                         RETURN_FAIL("Setting DTR signal level failed");
2069                                 break;
2070                         case SP_DTR_FLOW_CONTROL:
2071                                 data->dtr_flow = 1;
2072                                 break;
2073                         default:
2074                                 break;
2075                         }
2076                         if (config->dsr == SP_DSR_FLOW_CONTROL)
2077                                 data->dsr_flow = 1;
2078                 } else {
2079                         /* DTR/DSR flow control not supported. */
2080                         if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
2081                                 RETURN_ERROR(SP_ERR_SUPP, "DTR/DSR flow control not supported");
2082
2083                         if (config->dtr >= 0) {
2084                                 controlbits = TIOCM_DTR;
2085                                 if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
2086                                                 &controlbits) < 0)
2087                                         RETURN_FAIL("Setting DTR signal level failed");
2088                         }
2089                 }
2090         }
2091
2092         if (config->xon_xoff >= 0) {
2093                 data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
2094                 switch (config->xon_xoff) {
2095                 case SP_XONXOFF_DISABLED:
2096                         break;
2097                 case SP_XONXOFF_IN:
2098                         data->term.c_iflag |= IXOFF;
2099                         break;
2100                 case SP_XONXOFF_OUT:
2101                         data->term.c_iflag |= IXON | IXANY;
2102                         break;
2103                 case SP_XONXOFF_INOUT:
2104                         data->term.c_iflag |= IXON | IXOFF | IXANY;
2105                         break;
2106                 default:
2107                         RETURN_ERROR(SP_ERR_ARG, "Invalid XON/XOFF setting");
2108                 }
2109         }
2110
2111         if (tcsetattr(port->fd, TCSANOW, &data->term) < 0)
2112                 RETURN_FAIL("tcsetattr() failed");
2113
2114 #ifdef __APPLE__
2115         if (baud_nonstd != B0) {
2116                 if (ioctl(port->fd, IOSSIOSPEED, &baud_nonstd) == -1)
2117                         RETURN_FAIL("IOSSIOSPEED ioctl failed");
2118                 /* Set baud rates in data->term to correct, but incompatible
2119                  * with tcsetattr() value, same as delivered by tcgetattr(). */
2120                 if (cfsetspeed(&data->term, baud_nonstd) < 0)
2121                         RETURN_FAIL("cfsetspeed() failed");
2122         }
2123 #elif defined(__linux__)
2124 #ifdef USE_TERMIOS_SPEED
2125         if (baud_nonstd)
2126                 TRY(set_baudrate(port->fd, config->baudrate));
2127 #endif
2128 #ifdef USE_TERMIOX
2129         if (data->termiox_supported)
2130                 TRY(set_flow(port->fd, data));
2131 #endif
2132 #endif
2133
2134 #endif /* !_WIN32 */
2135
2136         RETURN_OK();
2137 }
2138
2139 enum sp_return sp_new_config(struct sp_port_config **config_ptr)
2140 {
2141         struct sp_port_config *config;
2142
2143         TRACE("%p", config_ptr);
2144
2145         if (!config_ptr)
2146                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2147
2148         *config_ptr = NULL;
2149
2150         if (!(config = malloc(sizeof(struct sp_port_config))))
2151                 RETURN_ERROR(SP_ERR_MEM, "config malloc failed");
2152
2153         config->baudrate = -1;
2154         config->bits = -1;
2155         config->parity = -1;
2156         config->stopbits = -1;
2157         config->rts = -1;
2158         config->cts = -1;
2159         config->dtr = -1;
2160         config->dsr = -1;
2161
2162         *config_ptr = config;
2163
2164         RETURN_OK();
2165 }
2166
2167 void sp_free_config(struct sp_port_config *config)
2168 {
2169         TRACE("%p", config);
2170
2171         if (!config)
2172                 DEBUG("Null config");
2173         else
2174                 free(config);
2175
2176         RETURN();
2177 }
2178
2179 enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config)
2180 {
2181         struct port_data data;
2182
2183         TRACE("%p, %p", port, config);
2184
2185         CHECK_OPEN_PORT();
2186
2187         if (!config)
2188                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2189
2190         TRY(get_config(port, &data, config));
2191
2192         RETURN_OK();
2193 }
2194
2195 enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config)
2196 {
2197         struct port_data data;
2198         struct sp_port_config prev_config;
2199
2200         TRACE("%p, %p", port, config);
2201
2202         CHECK_OPEN_PORT();
2203
2204         if (!config)
2205                 RETURN_ERROR(SP_ERR_ARG, "Null config");
2206
2207         TRY(get_config(port, &data, &prev_config));
2208         TRY(set_config(port, &data, config));
2209
2210         RETURN_OK();
2211 }
2212
2213 #define CREATE_ACCESSORS(x, type) \
2214 enum sp_return sp_set_##x(struct sp_port *port, type x) { \
2215         struct port_data data; \
2216         struct sp_port_config config; \
2217         TRACE("%p, %d", port, x); \
2218         CHECK_OPEN_PORT(); \
2219         TRY(get_config(port, &data, &config)); \
2220         config.x = x; \
2221         TRY(set_config(port, &data, &config)); \
2222         RETURN_OK(); \
2223 } \
2224 enum sp_return sp_get_config_##x(const struct sp_port_config *config, type *x) { \
2225         TRACE("%p, %p", config, x); \
2226         if (!config) \
2227                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2228         *x = config->x; \
2229         RETURN_OK(); \
2230 } \
2231 enum sp_return sp_set_config_##x(struct sp_port_config *config, type x) { \
2232         TRACE("%p, %d", config, x); \
2233         if (!config) \
2234                 RETURN_ERROR(SP_ERR_ARG, "Null config"); \
2235         config->x = x; \
2236         RETURN_OK(); \
2237 }
2238
2239 CREATE_ACCESSORS(baudrate, int)
2240 CREATE_ACCESSORS(bits, int)
2241 CREATE_ACCESSORS(parity, enum sp_parity)
2242 CREATE_ACCESSORS(stopbits, int)
2243 CREATE_ACCESSORS(rts, enum sp_rts)
2244 CREATE_ACCESSORS(cts, enum sp_cts)
2245 CREATE_ACCESSORS(dtr, enum sp_dtr)
2246 CREATE_ACCESSORS(dsr, enum sp_dsr)
2247 CREATE_ACCESSORS(xon_xoff, enum sp_xonxoff)
2248
2249 enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config, enum sp_flowcontrol flowcontrol)
2250 {
2251         if (!config)
2252                 RETURN_ERROR(SP_ERR_ARG, "Null configuration");
2253
2254         if (flowcontrol > SP_FLOWCONTROL_DTRDSR)
2255                 RETURN_ERROR(SP_ERR_ARG, "Invalid flow control setting");
2256
2257         if (flowcontrol == SP_FLOWCONTROL_XONXOFF)
2258                 config->xon_xoff = SP_XONXOFF_INOUT;
2259         else
2260                 config->xon_xoff = SP_XONXOFF_DISABLED;
2261
2262         if (flowcontrol == SP_FLOWCONTROL_RTSCTS) {
2263                 config->rts = SP_RTS_FLOW_CONTROL;
2264                 config->cts = SP_CTS_FLOW_CONTROL;
2265         } else {
2266                 if (config->rts == SP_RTS_FLOW_CONTROL)
2267                         config->rts = SP_RTS_ON;
2268                 config->cts = SP_CTS_IGNORE;
2269         }
2270
2271         if (flowcontrol == SP_FLOWCONTROL_DTRDSR) {
2272                 config->dtr = SP_DTR_FLOW_CONTROL;
2273                 config->dsr = SP_DSR_FLOW_CONTROL;
2274         } else {
2275                 if (config->dtr == SP_DTR_FLOW_CONTROL)
2276                         config->dtr = SP_DTR_ON;
2277                 config->dsr = SP_DSR_IGNORE;
2278         }
2279
2280         RETURN_OK();
2281 }
2282
2283 enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol)
2284 {
2285         struct port_data data;
2286         struct sp_port_config config;
2287
2288         TRACE("%p, %d", port, flowcontrol);
2289
2290         CHECK_OPEN_PORT();
2291
2292         TRY(get_config(port, &data, &config));
2293
2294         TRY(sp_set_config_flowcontrol(&config, flowcontrol));
2295
2296         TRY(set_config(port, &data, &config));
2297
2298         RETURN_OK();
2299 }
2300
2301 enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signals)
2302 {
2303         TRACE("%p, %p", port, signals);
2304
2305         CHECK_OPEN_PORT();
2306
2307         if (!signals)
2308                 RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
2309
2310         DEBUG("Getting control signals for port %s", port->name);
2311
2312         *signals = 0;
2313 #ifdef _WIN32
2314         DWORD bits;
2315         if (GetCommModemStatus(port->hdl, &bits) == 0)
2316                 RETURN_FAIL("GetCommModemStatus() failed");
2317         if (bits & MS_CTS_ON)
2318                 *signals |= SP_SIG_CTS;
2319         if (bits & MS_DSR_ON)
2320                 *signals |= SP_SIG_DSR;
2321         if (bits & MS_RLSD_ON)
2322                 *signals |= SP_SIG_DCD;
2323         if (bits & MS_RING_ON)
2324                 *signals |= SP_SIG_RI;
2325 #else
2326         int bits;
2327         if (ioctl(port->fd, TIOCMGET, &bits) < 0)
2328                 RETURN_FAIL("TIOCMGET ioctl failed");
2329         if (bits & TIOCM_CTS)
2330                 *signals |= SP_SIG_CTS;
2331         if (bits & TIOCM_DSR)
2332                 *signals |= SP_SIG_DSR;
2333         if (bits & TIOCM_CAR)
2334                 *signals |= SP_SIG_DCD;
2335         if (bits & TIOCM_RNG)
2336                 *signals |= SP_SIG_RI;
2337 #endif
2338         RETURN_OK();
2339 }
2340
2341 enum sp_return sp_start_break(struct sp_port *port)
2342 {
2343         TRACE("%p", port);
2344
2345         CHECK_OPEN_PORT();
2346 #ifdef _WIN32
2347         if (SetCommBreak(port->hdl) == 0)
2348                 RETURN_FAIL("SetCommBreak() failed");
2349 #else
2350         if (ioctl(port->fd, TIOCSBRK, 1) < 0)
2351                 RETURN_FAIL("TIOCSBRK ioctl failed");
2352 #endif
2353
2354         RETURN_OK();
2355 }
2356
2357 enum sp_return sp_end_break(struct sp_port *port)
2358 {
2359         TRACE("%p", port);
2360
2361         CHECK_OPEN_PORT();
2362 #ifdef _WIN32
2363         if (ClearCommBreak(port->hdl) == 0)
2364                 RETURN_FAIL("ClearCommBreak() failed");
2365 #else
2366         if (ioctl(port->fd, TIOCCBRK, 1) < 0)
2367                 RETURN_FAIL("TIOCCBRK ioctl failed");
2368 #endif
2369
2370         RETURN_OK();
2371 }
2372
2373 int sp_last_error_code(void)
2374 {
2375         TRACE("");
2376 #ifdef _WIN32
2377         RETURN_VALUE("%d", GetLastError());
2378 #else
2379         RETURN_VALUE("%d", errno);
2380 #endif
2381 }
2382
2383 char *sp_last_error_message(void)
2384 {
2385         TRACE("");
2386
2387 #ifdef _WIN32
2388         LPVOID message;
2389         DWORD error = GetLastError();
2390
2391         FormatMessage(
2392                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
2393                 FORMAT_MESSAGE_FROM_SYSTEM |
2394                 FORMAT_MESSAGE_IGNORE_INSERTS,
2395                 NULL,
2396                 error,
2397                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
2398                 (LPTSTR) &message,
2399                 0, NULL );
2400
2401         RETURN_VALUE("%s", message);
2402 #else
2403         RETURN_VALUE("%s", strerror(errno));
2404 #endif
2405 }
2406
2407 void sp_free_error_message(char *message)
2408 {
2409         TRACE("%s", message);
2410
2411 #ifdef _WIN32
2412         LocalFree(message);
2413 #else
2414         (void)message;
2415 #endif
2416
2417         RETURN();
2418 }
2419
2420 void sp_set_debug_handler(void (*handler)(const char *format, ...))
2421 {
2422         TRACE("%p", handler);
2423
2424         sp_debug_handler = handler;
2425
2426         RETURN();
2427 }
2428
2429 void sp_default_debug_handler(const char *format, ...)
2430 {
2431         va_list args;
2432         va_start(args, format);
2433         if (getenv("LIBSERIALPORT_DEBUG")) {
2434                 fputs("sp: ", stderr);
2435                 vfprintf(stderr, format, args);
2436         }
2437         va_end(args);
2438 }
2439
2440 int sp_get_major_package_version(void)
2441 {
2442         return SP_PACKAGE_VERSION_MAJOR;
2443 }
2444
2445 int sp_get_minor_package_version(void)
2446 {
2447         return SP_PACKAGE_VERSION_MINOR;
2448 }
2449
2450 int sp_get_micro_package_version(void)
2451 {
2452         return SP_PACKAGE_VERSION_MICRO;
2453 }
2454
2455 const char *sp_get_package_version_string(void)
2456 {
2457         return SP_PACKAGE_VERSION_STRING;
2458 }
2459
2460 int sp_get_current_lib_version(void)
2461 {
2462         return SP_LIB_VERSION_CURRENT;
2463 }
2464
2465 int sp_get_revision_lib_version(void)
2466 {
2467         return SP_LIB_VERSION_REVISION;
2468 }
2469
2470 int sp_get_age_lib_version(void)
2471 {
2472         return SP_LIB_VERSION_AGE;
2473 }
2474
2475 const char *sp_get_lib_version_string(void)
2476 {
2477         return SP_LIB_VERSION_STRING;
2478 }
2479
2480 /** @} */