qserialport_unix.cpp 36.1 KB
Newer Older
Bill Bonney's avatar
Bill Bonney committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431
/****************************************************************************
**
** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com>
** Copyright (C) 2012 Laszlo Papp <lpapp@kde.org>
** Copyright (C) 2012 Andre Hartmann <aha_1980@gmx.de>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtSerialPort module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qserialport_unix_p.h"
#include "qttylocker_unix_p.h"

#include <errno.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>

#ifdef Q_OS_MAC
#if defined (MAC_OS_X_VERSION_10_4) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4)
#include <IOKit/serial/ioss.h>
#endif
#endif

#include <QtCore/qelapsedtimer.h>
#include <QtCore/qsocketnotifier.h>
#include <QtCore/qmap.h>

QT_BEGIN_NAMESPACE

class ReadNotifier : public QSocketNotifier
{
public:
    ReadNotifier(QSerialPortPrivate *d, QObject *parent)
        : QSocketNotifier(d->descriptor, QSocketNotifier::Read, parent)
        , dptr(d)
    {}

protected:
    bool event(QEvent *e) Q_DECL_OVERRIDE {
        bool ret = QSocketNotifier::event(e);
        if (ret)
            dptr->readNotification();
        return ret;
    }

private:
    QSerialPortPrivate *dptr;
};

class WriteNotifier : public QSocketNotifier
{
public:
    WriteNotifier(QSerialPortPrivate *d, QObject *parent)
        : QSocketNotifier(d->descriptor, QSocketNotifier::Write, parent)
        , dptr(d)
    {}

protected:
    bool event(QEvent *e) Q_DECL_OVERRIDE {
        bool ret = QSocketNotifier::event(e);
        if (ret)
            dptr->writeNotification(QSerialPortPrivateData::WriteChunkSize);
        return ret;
    }

private:
    QSerialPortPrivate *dptr;
};

class ExceptionNotifier : public QSocketNotifier
{
public:
    ExceptionNotifier(QSerialPortPrivate *d, QObject *parent)
        : QSocketNotifier(d->descriptor, QSocketNotifier::Exception, parent)
        , dptr(d)
    {}

protected:
    bool event(QEvent *e) Q_DECL_OVERRIDE {
        bool ret = QSocketNotifier::event(e);
        if (ret)
            dptr->exceptionNotification();
        return ret;
    }

private:
    QSerialPortPrivate *dptr;
};

QSerialPortPrivate::QSerialPortPrivate(QSerialPort *q)
    : QSerialPortPrivateData(q)
    , descriptor(-1)
    , isCustomBaudRateSupported(false)
    , readNotifier(0)
    , writeNotifier(0)
    , exceptionNotifier(0)
    , readPortNotifierCalled(false)
    , readPortNotifierState(false)
    , readPortNotifierStateSet(false)
    , emittedReadyRead(false)
    , emittedBytesWritten(false)
{
}

bool QSerialPortPrivate::open(QIODevice::OpenMode mode)
{
    QByteArray portName = portNameFromSystemLocation(systemLocation).toLocal8Bit();
    const char *ptr = portName.constData();

    bool byCurrPid = false;
    if (QTtyLocker::isLocked(ptr, &byCurrPid)) {
        q_ptr->setError(QSerialPort::PermissionError);
        return false;
    }

    int flags = O_NOCTTY | O_NONBLOCK;

    switch (mode & QIODevice::ReadWrite) {
    case QIODevice::WriteOnly:
        flags |= O_WRONLY;
        break;
    case QIODevice::ReadWrite:
        flags |= O_RDWR;
        break;
    default:
        flags |= O_RDONLY;
        break;
    }

    descriptor = ::open(systemLocation.toLocal8Bit().constData(), flags);

    if (descriptor == -1) {
        q_ptr->setError(decodeSystemError());
        return false;
    }

    ::fcntl(descriptor, F_SETFL, FNDELAY);

    QTtyLocker::lock(ptr);
    if (!QTtyLocker::isLocked(ptr, &byCurrPid)) {
        q_ptr->setError(QSerialPort::PermissionError);
        return false;
    }

#ifdef TIOCEXCL
    ::ioctl(descriptor, TIOCEXCL);
#endif

    if (::tcgetattr(descriptor, &restoredTermios) == -1) {
        q_ptr->setError(decodeSystemError());
        return false;
    }

    currentTermios = restoredTermios;
    ::cfmakeraw(&currentTermios);
    currentTermios.c_cflag |= CLOCAL;
    currentTermios.c_cc[VTIME] = 0;
    currentTermios.c_cc[VMIN] = 0;

    if (mode & QIODevice::ReadOnly)
        currentTermios.c_cflag |= CREAD;

    if (!updateTermios())
        return false;

    setExceptionNotificationEnabled(true);

    if ((flags & O_WRONLY) == 0)
        setReadNotificationEnabled(true);

    detectDefaultSettings();
    return true;
}

void QSerialPortPrivate::close()
{
    if (settingsRestoredOnClose) {
        ::tcsetattr(descriptor, TCSANOW, &restoredTermios);
#ifdef Q_OS_LINUX
        if (isCustomBaudRateSupported)
            ::ioctl(descriptor, TIOCSSERIAL, &restoredSerialInfo);
#endif
    }

#ifdef TIOCNXCL
    ::ioctl(descriptor, TIOCNXCL);
#endif

    if (readNotifier) {
        readNotifier->setEnabled(false);
        readNotifier->deleteLater();
        readNotifier = 0;
    }

    if (writeNotifier) {
        writeNotifier->setEnabled(false);
        writeNotifier->deleteLater();
        writeNotifier = 0;
    }

    if (exceptionNotifier) {
        exceptionNotifier->setEnabled(false);
        exceptionNotifier->deleteLater();
        exceptionNotifier = 0;
    }

    ::close(descriptor);

    QByteArray portName = portNameFromSystemLocation(systemLocation).toLocal8Bit();
    const char *ptr = portName.constData();

    bool byCurrPid = false;
    if (QTtyLocker::isLocked(ptr, &byCurrPid) && byCurrPid)
        QTtyLocker::unlock(ptr);

    descriptor = -1;
    isCustomBaudRateSupported = false;
}

QSerialPort::PinoutSignals QSerialPortPrivate::pinoutSignals() const
{
    int arg = 0;
    QSerialPort::PinoutSignals ret = QSerialPort::NoSignal;

    if (::ioctl(descriptor, TIOCMGET, &arg) == -1) {
        q_ptr->setError(decodeSystemError());
        return ret;
    }

#ifdef TIOCM_LE
    if (arg & TIOCM_LE)
        ret |= QSerialPort::DataSetReadySignal;
#endif
#ifdef TIOCM_DTR
    if (arg & TIOCM_DTR)
        ret |= QSerialPort::DataTerminalReadySignal;
#endif
#ifdef TIOCM_RTS
    if (arg & TIOCM_RTS)
        ret |= QSerialPort::RequestToSendSignal;
#endif
#ifdef TIOCM_ST
    if (arg & TIOCM_ST)
        ret |= QSerialPort::SecondaryTransmittedDataSignal;
#endif
#ifdef TIOCM_SR
    if (arg & TIOCM_SR)
        ret |= QSerialPort::SecondaryReceivedDataSignal;
#endif
#ifdef TIOCM_CTS
    if (arg & TIOCM_CTS)
        ret |= QSerialPort::ClearToSendSignal;
#endif
#ifdef TIOCM_CAR
    if (arg & TIOCM_CAR)
        ret |= QSerialPort::DataCarrierDetectSignal;
#elif defined TIOCM_CD
    if (arg & TIOCM_CD)
        ret |= QSerialPort::DataCarrierDetectSignal;
#endif
#ifdef TIOCM_RNG
    if (arg & TIOCM_RNG)
        ret |= QSerialPort::RingIndicatorSignal;
#elif defined TIOCM_RI
    if (arg & TIOCM_RI)
        ret |= QSerialPort::RingIndicatorSignal;
#endif
#ifdef TIOCM_DSR
    if (arg & TIOCM_DSR)
        ret |= QSerialPort::DataSetReadySignal;
#endif

    return ret;
}

bool QSerialPortPrivate::setDataTerminalReady(bool set)
{
    int status = TIOCM_DTR;
    return ::ioctl(descriptor, set ? TIOCMBIS : TIOCMBIC, &status) != -1;
}

bool QSerialPortPrivate::setRequestToSend(bool set)
{
    int status = TIOCM_RTS;
    return ::ioctl(descriptor, set ? TIOCMBIS : TIOCMBIC, &status) != -1;
}

bool QSerialPortPrivate::flush()
{
    return writeNotification() && (::tcdrain(descriptor) != -1);
}

bool QSerialPortPrivate::clear(QSerialPort::Directions dir)
{
    return ::tcflush(descriptor, (dir == QSerialPort::AllDirections)
                     ? TCIOFLUSH : (dir & QSerialPort::Input) ? TCIFLUSH : TCOFLUSH) != -1;
}

bool QSerialPortPrivate::sendBreak(int duration)
{
    return ::tcsendbreak(descriptor, duration) != -1;
}

bool QSerialPortPrivate::setBreakEnabled(bool set)
{
    return ::ioctl(descriptor, set ? TIOCSBRK : TIOCCBRK) != -1;
}

qint64 QSerialPortPrivate::systemInputQueueSize () const
{
    int nbytes = 0;
#ifdef TIOCINQ
    if (::ioctl(descriptor, TIOCINQ, &nbytes) == -1)
        return -1;
#endif
    return nbytes;
}

qint64 QSerialPortPrivate::systemOutputQueueSize () const
{
    int nbytes = 0;
#ifdef TIOCOUTQ
    if (::ioctl(descriptor, TIOCOUTQ, &nbytes) == -1)
        return -1;
#endif
    return nbytes;
}

qint64 QSerialPortPrivate::bytesAvailable() const
{
    return readBuffer.size();
}

qint64 QSerialPortPrivate::readFromBuffer(char *data, qint64 maxSize)
{
    if (readBuffer.isEmpty())
        return 0;

    if (maxSize == 1) {
        *data = readBuffer.getChar();
        if (readBuffer.isEmpty())
            setReadNotificationEnabled(true);
        return 1;
    }

    const qint64 bytesToRead = qMin(qint64(readBuffer.size()), maxSize);
    qint64 readSoFar = 0;
    while (readSoFar < bytesToRead) {
        const char *ptr = readBuffer.readPointer();
        const int bytesToReadFromThisBlock = qMin(int(bytesToRead - readSoFar),
                                                  readBuffer.nextDataBlockSize());
        ::memcpy(data + readSoFar, ptr, bytesToReadFromThisBlock);
        readSoFar += bytesToReadFromThisBlock;
        readBuffer.free(bytesToReadFromThisBlock);
    }

    if (!isReadNotificationEnabled())
        setReadNotificationEnabled(true);

    if (readSoFar > 0) {
        if (readBuffer.isEmpty())
            setReadNotificationEnabled(true);
        return readSoFar;
    }

    return readSoFar;
}

qint64 QSerialPortPrivate::writeToBuffer(const char *data, qint64 maxSize)
{
    char *ptr = writeBuffer.reserve(maxSize);
    if (maxSize == 1)
        *ptr = *data;
    else
        ::memcpy(ptr, data, maxSize);

    const qint64 written = maxSize;

    if (!writeBuffer.isEmpty() && !isWriteNotificationEnabled())
        setWriteNotificationEnabled(true);

    return written;
}

bool QSerialPortPrivate::waitForReadyRead(int msecs)
{
    QElapsedTimer stopWatch;

    stopWatch.start();

    do {
        bool readyToRead = false;
        bool readyToWrite = false;
        bool timedOut = false;
        if (!waitForReadOrWrite(&readyToRead, &readyToWrite, true, !writeBuffer.isEmpty(),
                                timeoutValue(msecs, stopWatch.elapsed()), &timedOut)) {
432 433
            if (!timedOut)
                q_ptr->setError(decodeSystemError());
Bill Bonney's avatar
Bill Bonney committed
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
            return false;
        }

        if (readyToRead) {
            if (readNotification())
                return true;
        }

        if (readyToWrite)
            writeNotification(WriteChunkSize);

    } while (msecs == -1 || timeoutValue(msecs, stopWatch.elapsed()) > 0);
    return false;
}

bool QSerialPortPrivate::waitForBytesWritten(int msecs)
{
    if (writeBuffer.isEmpty())
        return false;

    QElapsedTimer stopWatch;

    stopWatch.start();

    forever {
        bool readyToRead = false;
        bool readyToWrite = false;
        bool timedOut = false;
        if (!waitForReadOrWrite(&readyToRead, &readyToWrite, true, !writeBuffer.isEmpty(),
                                timeoutValue(msecs, stopWatch.elapsed()), &timedOut)) {
464 465
            if (!timedOut)
                q_ptr->setError(decodeSystemError());
Bill Bonney's avatar
Bill Bonney committed
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
            return false;
        }

        if (readyToRead && !readNotification())
            return false;

        if (readyToWrite)
            return writeNotification(WriteChunkSize);
    }
    return false;
}

bool QSerialPortPrivate::setBaudRate(qint32 baudRate, QSerialPort::Directions dir)
{
    bool ret = baudRate > 0;

    // prepare section

    if (ret) {
        const qint32 unixBaudRate = QSerialPortPrivate::settingFromBaudRate(baudRate);
        if (unixBaudRate > 0) {
            // try prepate to set standard baud rate
#ifdef Q_OS_LINUX
            // prepare to forcefully reset the custom mode
            if (isCustomBaudRateSupported) {
                //currentSerialInfo.flags |= ASYNC_SPD_MASK;
                currentSerialInfo.flags &= ~(ASYNC_SPD_CUST /* | ASYNC_LOW_LATENCY*/);
                currentSerialInfo.custom_divisor = 0;
            }
#endif
            // prepare to set standard baud rate
            ret = !(((dir & QSerialPort::Input) && ::cfsetispeed(&currentTermios, unixBaudRate) < 0)
                    || ((dir & QSerialPort::Output) && ::cfsetospeed(&currentTermios, unixBaudRate) < 0));
        } else {
            // try prepate to set custom baud rate
#ifdef Q_OS_LINUX
            // prepare to forcefully set the custom mode
            if (isCustomBaudRateSupported) {
                currentSerialInfo.flags &= ~ASYNC_SPD_MASK;
                currentSerialInfo.flags |= (ASYNC_SPD_CUST /* | ASYNC_LOW_LATENCY*/);
                currentSerialInfo.custom_divisor = currentSerialInfo.baud_base / baudRate;
                if (currentSerialInfo.custom_divisor == 0)
                    currentSerialInfo.custom_divisor = 1;
                // for custom mode needed prepare to set B38400 baud rate
                ret = (::cfsetspeed(&currentTermios, B38400) != -1);
            } else {
                ret = false;
            }
#elif defined(Q_OS_MAC)

#  if defined (MAC_OS_X_VERSION_10_4) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4)
            // Starting with Tiger, the IOSSIOSPEED ioctl can be used to set arbitrary baud rates
            // other than those specified by POSIX. The driver for the underlying serial hardware
            // ultimately determines which baud rates can be used. This ioctl sets both the input
            // and output speed.
            ret = ::ioctl(descriptor, IOSSIOSPEED, &baudRate) != -1;
#  else
            // others MacOSX version, can't prepare to set custom baud rate
            ret = false;
#  endif

#else
            // others *nix OS, can't prepare to set custom baud rate
            ret = false;
#endif
        }
    }

    // finally section

#ifdef Q_OS_LINUX
    if (ret && isCustomBaudRateSupported) // finally, set or reset the custom mode
        ret = ::ioctl(descriptor, TIOCSSERIAL, &currentSerialInfo) != -1;
#endif

    if (ret) // finally, set baud rate
        ret = updateTermios();
    else
        q_ptr->setError(decodeSystemError());
    return ret;
}

bool QSerialPortPrivate::setDataBits(QSerialPort::DataBits dataBits)
{
    currentTermios.c_cflag &= ~CSIZE;
    switch (dataBits) {
    case QSerialPort::Data5:
        currentTermios.c_cflag |= CS5;
        break;
    case QSerialPort::Data6:
        currentTermios.c_cflag |= CS6;
        break;
    case QSerialPort::Data7:
        currentTermios.c_cflag |= CS7;
        break;
    case QSerialPort::Data8:
        currentTermios.c_cflag |= CS8;
        break;
    default:
        currentTermios.c_cflag |= CS8;
        break;
    }
    return updateTermios();
}

bool QSerialPortPrivate::setParity(QSerialPort::Parity parity)
{
    currentTermios.c_iflag &= ~(PARMRK | INPCK);
    currentTermios.c_iflag |= IGNPAR;

    switch (parity) {

#ifdef CMSPAR
    // Here Installation parity only for GNU/Linux where the macro CMSPAR.
    case QSerialPort::SpaceParity:
        currentTermios.c_cflag &= ~PARODD;
        currentTermios.c_cflag |= PARENB | CMSPAR;
        break;
    case QSerialPort::MarkParity:
        currentTermios.c_cflag |= PARENB | CMSPAR | PARODD;
        break;
#endif
    case QSerialPort::NoParity:
        currentTermios.c_cflag &= ~PARENB;
        break;
    case QSerialPort::EvenParity:
        currentTermios.c_cflag &= ~PARODD;
        currentTermios.c_cflag |= PARENB;
        break;
    case QSerialPort::OddParity:
        currentTermios.c_cflag |= PARENB | PARODD;
        break;
    default:
        currentTermios.c_cflag |= PARENB;
        currentTermios.c_iflag |= PARMRK | INPCK;
        currentTermios.c_iflag &= ~IGNPAR;
        break;
    }

    return updateTermios();
}

bool QSerialPortPrivate::setStopBits(QSerialPort::StopBits stopBits)
{
    switch (stopBits) {
    case QSerialPort::OneStop:
        currentTermios.c_cflag &= ~CSTOPB;
        break;
    case QSerialPort::TwoStop:
        currentTermios.c_cflag |= CSTOPB;
        break;
    default:
        currentTermios.c_cflag &= ~CSTOPB;
        break;
    }
    return updateTermios();
}

bool QSerialPortPrivate::setFlowControl(QSerialPort::FlowControl flow)
{
    switch (flow) {
    case QSerialPort::NoFlowControl:
        currentTermios.c_cflag &= ~CRTSCTS;
        currentTermios.c_iflag &= ~(IXON | IXOFF | IXANY);
        break;
    case QSerialPort::HardwareControl:
        currentTermios.c_cflag |= CRTSCTS;
        currentTermios.c_iflag &= ~(IXON | IXOFF | IXANY);
        break;
    case QSerialPort::SoftwareControl:
        currentTermios.c_cflag &= ~CRTSCTS;
        currentTermios.c_iflag |= IXON | IXOFF | IXANY;
        break;
    default:
        currentTermios.c_cflag &= ~CRTSCTS;
        currentTermios.c_iflag &= ~(IXON | IXOFF | IXANY);
        break;
    }
    return updateTermios();
}

bool QSerialPortPrivate::setDataErrorPolicy(QSerialPort::DataErrorPolicy policy)
{
    tcflag_t parmrkMask = PARMRK;
#ifndef CMSPAR
    // in space/mark parity emulation also used PARMRK flag
    if (parity == QSerialPort::SpaceParity
            || parity == QSerialPort::MarkParity) {
        parmrkMask = 0;
    }
#endif //CMSPAR
    switch (policy) {
    case QSerialPort::SkipPolicy:
        currentTermios.c_iflag &= ~parmrkMask;
        currentTermios.c_iflag |= IGNPAR | INPCK;
        break;
    case QSerialPort::PassZeroPolicy:
        currentTermios.c_iflag &= ~(IGNPAR | parmrkMask);
        currentTermios.c_iflag |= INPCK;
        break;
    case QSerialPort::IgnorePolicy:
        currentTermios.c_iflag &= ~INPCK;
        break;
    case QSerialPort::StopReceivingPolicy:
        currentTermios.c_iflag &= ~IGNPAR;
        currentTermios.c_iflag |= parmrkMask | INPCK;
        break;
    default:
        currentTermios.c_iflag &= ~INPCK;
        break;
    }
    return updateTermios();
}

bool QSerialPortPrivate::readNotification()
{
    // Prevent recursive calls
    if (readPortNotifierCalled) {
        if (!readPortNotifierStateSet) {
            readPortNotifierStateSet = true;
            readPortNotifierState = isReadNotificationEnabled();
            setReadNotificationEnabled(false);
        }
    }

    readPortNotifierCalled = true;

    // Always buffered, read data from the port into the read buffer
    qint64 newBytes = readBuffer.size();
    qint64 bytesToRead = policy == QSerialPort::IgnorePolicy ? ReadChunkSize : 1;

    if (readBufferMaxSize && bytesToRead > (readBufferMaxSize - readBuffer.size())) {
        bytesToRead = readBufferMaxSize - readBuffer.size();
        if (bytesToRead == 0) {
            // Buffer is full. User must read data from the buffer
            // before we can read more from the port.
            return false;
        }
    }

    char *ptr = readBuffer.reserve(bytesToRead);
    const qint64 readBytes = readFromPort(ptr, bytesToRead);

    if (readBytes <= 0) {
        readBuffer.chop(bytesToRead);
        return false;
    }

    readBuffer.chop(bytesToRead - qMax(readBytes, qint64(0)));

    newBytes = readBuffer.size() - newBytes;

    // If read buffer is full, disable the read port notifier.
    if (readBufferMaxSize && readBuffer.size() == readBufferMaxSize)
        setReadNotificationEnabled(false);

    // only emit readyRead() when not recursing, and only if there is data available
    const bool hasData = newBytes > 0;

    if (!emittedReadyRead && hasData) {
        emittedReadyRead = true;
        emit q_ptr->readyRead();
        emittedReadyRead = false;
    }

    if (!hasData)
        setReadNotificationEnabled(true);

    // reset the read port notifier state if we reentered inside the
    // readyRead() connected slot.
    if (readPortNotifierStateSet
            && readPortNotifierState != isReadNotificationEnabled()) {
        setReadNotificationEnabled(readPortNotifierState);
        readPortNotifierStateSet = false;
    }
    return true;
}

bool QSerialPortPrivate::writeNotification(int maxSize)
{
    const int tmp = writeBuffer.size();

    if (writeBuffer.isEmpty()) {
        setWriteNotificationEnabled(false);
        return false;
    }

    int nextSize = qMin(writeBuffer.nextDataBlockSize(), maxSize);

    const char *ptr = writeBuffer.readPointer();

    // Attempt to write it chunk.
    qint64 written = writeToPort(ptr, nextSize);
    if (written < 0)
        return false;

    // Remove what we wrote so far.
    writeBuffer.free(written);
    if (written > 0) {
        // Don't emit bytesWritten() recursively.
        if (!emittedBytesWritten) {
            emittedBytesWritten = true;
            emit q_ptr->bytesWritten(written);
            emittedBytesWritten = false;
        }
    }

    if (writeBuffer.isEmpty())
        setWriteNotificationEnabled(false);

    return (writeBuffer.size() < tmp);
}

bool QSerialPortPrivate::exceptionNotification()
{
    QSerialPort::SerialPortError error = decodeSystemError();
    q_ptr->setError(error);

    return true;
}

bool QSerialPortPrivate::updateTermios()
{
    if (::tcsetattr(descriptor, TCSANOW, &currentTermios) == -1) {
        q_ptr->setError(decodeSystemError());
        return false;
    }
    return true;
}

void QSerialPortPrivate::detectDefaultSettings()
{
    // Detect baud rate.
    const speed_t inputUnixBaudRate = ::cfgetispeed(&currentTermios);
    const speed_t outputUnixBaudRate = ::cfgetospeed(&currentTermios);
    bool isCustomBaudRateCurrentSet = false;

#ifdef Q_OS_LINUX
    // try detect the ability to support custom baud rate
    isCustomBaudRateSupported = ::ioctl(descriptor, TIOCGSERIAL, &currentSerialInfo) != -1
            && ::ioctl(descriptor, TIOCSSERIAL, &currentSerialInfo) != -1;

    if (isCustomBaudRateSupported) {
        restoredSerialInfo = currentSerialInfo;

        // assume that the baud rate is a custom
        isCustomBaudRateCurrentSet = inputUnixBaudRate == B38400 && outputUnixBaudRate == B38400;

        if (isCustomBaudRateCurrentSet) {
            if ((currentSerialInfo.flags & ASYNC_SPD_CUST)
                    && currentSerialInfo.custom_divisor > 0) {

                // yes, speed is really custom
                inputBaudRate = currentSerialInfo.baud_base / currentSerialInfo.custom_divisor;
                outputBaudRate = inputBaudRate;
            } else {
                // no, we were wrong and the speed is a standard 38400 baud
                isCustomBaudRateCurrentSet = false;
            }
        }
    }
#else
    // other *nix
#endif
    if (!isCustomBaudRateSupported || !isCustomBaudRateCurrentSet) {
        inputBaudRate = QSerialPortPrivate::baudRateFromSetting(inputUnixBaudRate);
        outputBaudRate = QSerialPortPrivate::baudRateFromSetting(outputUnixBaudRate);
    }

    // Detect databits.
    switch (currentTermios.c_cflag & CSIZE) {
    case CS5:
        dataBits = QSerialPort::Data5;
        break;
    case CS6:
        dataBits = QSerialPort::Data6;
        break;
    case CS7:
        dataBits = QSerialPort::Data7;
        break;
    case CS8:
        dataBits = QSerialPort::Data8;
        break;
    default:
        dataBits = QSerialPort::UnknownDataBits;
        break;
    }

    // Detect parity.
#ifdef CMSPAR
    if (currentTermios.c_cflag & CMSPAR) {
        parity = currentTermios.c_cflag & PARODD ?
                    QSerialPort::MarkParity : QSerialPort::SpaceParity;
    } else {
#endif
        if (currentTermios.c_cflag & PARENB) {
            parity = currentTermios.c_cflag & PARODD ?
                        QSerialPort::OddParity : QSerialPort::EvenParity;
        } else {
            parity = QSerialPort::NoParity;
        }
#ifdef CMSPAR
    }
#endif

    // Detect stopbits.
    stopBits = currentTermios.c_cflag & CSTOPB ?
                QSerialPort::TwoStop : QSerialPort::OneStop;

    // Detect flow control.
    if ((!(currentTermios.c_cflag & CRTSCTS)) && (!(currentTermios.c_iflag & (IXON | IXOFF | IXANY))))
        flow = QSerialPort::NoFlowControl;
    else if ((!(currentTermios.c_cflag & CRTSCTS)) && (currentTermios.c_iflag & (IXON | IXOFF | IXANY)))
        flow = QSerialPort::SoftwareControl;
    else if ((currentTermios.c_cflag & CRTSCTS) && (!(currentTermios.c_iflag & (IXON | IXOFF | IXANY))))
        flow = QSerialPort::HardwareControl;
    else
        flow = QSerialPort::UnknownFlowControl;
}

QSerialPort::SerialPortError QSerialPortPrivate::decodeSystemError() const
{
    QSerialPort::SerialPortError error;
    switch (errno) {
    case ENODEV:
        error = QSerialPort::DeviceNotFoundError;
        break;
    case EACCES:
        error = QSerialPort::PermissionError;
        break;
    case EBUSY:
        error = QSerialPort::PermissionError;
        break;
    case EAGAIN:
        error = QSerialPort::ResourceError;
        break;
    case EIO:
        error = QSerialPort::ResourceError;
        break;
    case EBADF:
        error = QSerialPort::ResourceError;
        break;
#ifdef Q_OS_MAC
    case ENXIO:
        error = QSerialPort::ResourceError;
        break;
#endif
    default:
        error = QSerialPort::UnknownError;
        break;
    }
    return error;
}

bool QSerialPortPrivate::isReadNotificationEnabled() const
{
    return readNotifier && readNotifier->isEnabled();
}

void QSerialPortPrivate::setReadNotificationEnabled(bool enable)
{
    if (readNotifier) {
        readNotifier->setEnabled(enable);
    } else if (enable) {
        readNotifier = new ReadNotifier(this, q_ptr);
        readNotifier->setEnabled(true);
    }
}

bool QSerialPortPrivate::isWriteNotificationEnabled() const
{
    return writeNotifier && writeNotifier->isEnabled();
}

void QSerialPortPrivate::setWriteNotificationEnabled(bool enable)
{
    if (writeNotifier) {
        writeNotifier->setEnabled(enable);
    } else if (enable) {
        writeNotifier = new WriteNotifier(this, q_ptr);
        writeNotifier->setEnabled(true);
    }
}

bool QSerialPortPrivate::isExceptionNotificationEnabled() const
{
    return exceptionNotifier && exceptionNotifier->isEnabled();
}

void QSerialPortPrivate::setExceptionNotificationEnabled(bool enable)
{
    if (exceptionNotifier) {
        exceptionNotifier->setEnabled(enable);
    } else if (enable) {
        exceptionNotifier = new ExceptionNotifier(this, q_ptr);
        exceptionNotifier->setEnabled(true);
    }
}

bool QSerialPortPrivate::waitForReadOrWrite(bool *selectForRead, bool *selectForWrite,
                                           bool checkRead, bool checkWrite,
                                           int msecs, bool *timedOut)
{
    Q_ASSERT(selectForRead);
    Q_ASSERT(selectForWrite);
    Q_ASSERT(timedOut);

    fd_set fdread;
    FD_ZERO(&fdread);
    if (checkRead)
        FD_SET(descriptor, &fdread);

    fd_set fdwrite;
    FD_ZERO(&fdwrite);
    if (checkWrite)
        FD_SET(descriptor, &fdwrite);

    struct timeval tv;
    tv.tv_sec = msecs / 1000;
    tv.tv_usec = (msecs % 1000) * 1000;

    int ret = ::select(descriptor + 1, &fdread, &fdwrite, 0, msecs < 0 ? 0 : &tv);
    if (ret < 0)
        return false;
    if (ret == 0) {
        *timedOut = true;
        return false;
    }

    *selectForRead = FD_ISSET(descriptor, &fdread);
    *selectForWrite = FD_ISSET(descriptor, &fdwrite);

    return ret;
}

qint64 QSerialPortPrivate::readFromPort(char *data, qint64 maxSize)
{
    qint64 bytesRead = 0;
#if defined (CMSPAR)
    if (parity == QSerialPort::NoParity
            || policy != QSerialPort::StopReceivingPolicy) {
#else
    if (parity != QSerialPort::MarkParity
            && parity != QSerialPort::SpaceParity) {
#endif
        bytesRead = ::read(descriptor, data, maxSize);
    } else {// Perform parity emulation.
        bytesRead = readPerChar(data, maxSize);
    }

    if (bytesRead <= 0) {
        QSerialPort::SerialPortError error = decodeSystemError();
        if (error != QSerialPort::ResourceError)
            error = QSerialPort::ReadError;
        q_ptr->setError(error);
    }

    return bytesRead;
}

qint64 QSerialPortPrivate::writeToPort(const char *data, qint64 maxSize)
{
    qint64 bytesWritten = 0;
#if defined (CMSPAR)
    bytesWritten = ::write(descriptor, data, maxSize);
#else
    if (parity != QSerialPort::MarkParity
            && parity != QSerialPort::SpaceParity) {
        bytesWritten = ::write(descriptor, data, maxSize);
    } else {// Perform parity emulation.
        bytesWritten = writePerChar(data, maxSize);
    }
#endif

    if (bytesWritten < 0) {
        QSerialPort::SerialPortError error = decodeSystemError();
        if (error != QSerialPort::ResourceError)
            error = QSerialPort::WriteError;
        q_ptr->setError(error);
    }

    return bytesWritten;
}

static inline bool evenParity(quint8 c)
{
    c ^= c >> 4;        //(c7 ^ c3)(c6 ^ c2)(c5 ^ c1)(c4 ^ c0)
    c ^= c >> 2;        //[(c7 ^ c3)(c5 ^ c1)][(c6 ^ c2)(c4 ^ c0)]
    c ^= c >> 1;
    return c & 1;       //(c7 ^ c3)(c5 ^ c1)(c6 ^ c2)(c4 ^ c0)
}

#ifndef CMSPAR

qint64 QSerialPortPrivate::writePerChar(const char *data, qint64 maxSize)
{
    qint64 ret = 0;
    quint8 const charMask = (0xFF >> (8 - dataBits));

    while (ret < maxSize) {

        bool par = evenParity(*data & charMask);
        // False if need EVEN, true if need ODD.
        par ^= parity == QSerialPort::MarkParity;
        if (par ^ (currentTermios.c_cflag & PARODD)) { // Need switch parity mode?
            currentTermios.c_cflag ^= PARODD;
            flush(); //force sending already buffered data, because updateTermios() cleares buffers
            //todo: add receiving buffered data!!!
            if (!updateTermios())
                break;
        }

        int r = ::write(descriptor, data, 1);
        if (r < 0)
            return -1;
        if (r > 0) {
            data += r;
            ret += r;
        }
    }
    return ret;
}

#endif //CMSPAR

qint64 QSerialPortPrivate::readPerChar(char *data, qint64 maxSize)
{
    qint64 ret = 0;
    quint8 const charMask = (0xFF >> (8 - dataBits));

    // 0 - prefix not started,
    // 1 - received 0xFF,
    // 2 - received 0xFF and 0x00
    int prefix = 0;
    while (ret < maxSize) {

        qint64 r = ::read(descriptor, data, 1);
        if (r < 0) {
            if (errno == EAGAIN) // It is ok for nonblocking mode.
                break;
            return -1;
        }
        if (r == 0)
            break;

        bool par = true;
        switch (prefix) {
        case 2: // Previously received both 0377 and 0.
            par = false;
            prefix = 0;
            break;
        case 1: // Previously received 0377.
            if (*data == '\0') {
                ++prefix;
                continue;
            }
            prefix = 0;
            break;
        default:
            if (*data == '\377') {
                prefix = 1;
                continue;
            }
            break;
        }
        // Now: par contains parity ok or error, *data contains received character
        par ^= evenParity(*data & charMask); //par contains parity bit value for EVEN mode
        par ^= (currentTermios.c_cflag & PARODD); //par contains parity bit value for current mode
        if (par ^ (parity == QSerialPort::SpaceParity)) { //if parity error
            switch (policy) {
            case QSerialPort::SkipPolicy:
                continue;       //ignore received character
            case QSerialPort::StopReceivingPolicy:
                if (parity != QSerialPort::NoParity)
                    q_ptr->setError(QSerialPort::ParityError);
                else
                    q_ptr->setError(*data == '\0' ?
                                QSerialPort::BreakConditionError : QSerialPort::FramingError);
                return ++ret;   //abort receiving
                break;
            case QSerialPort::UnknownPolicy:
                // Unknown error policy is used! Falling back to PassZeroPolicy
            case QSerialPort::PassZeroPolicy:
                *data = '\0';   //replace received character by zero
                break;
            case QSerialPort::IgnorePolicy:
                break;          //ignore error and pass received character
            }
        }
        ++data;
        ++ret;
    }
    return ret;
}

#ifdef Q_OS_MAC
static const QLatin1String defaultFilePathPrefix("/dev/cu.");
static const QLatin1String unusedFilePathPrefix("/dev/tty.");
#else
static const QLatin1String defaultFilePathPrefix("/dev/");
#endif

QString QSerialPortPrivate::portNameToSystemLocation(const QString &port)
{
    QString ret = port;

#ifdef Q_OS_MAC
    ret.remove(unusedFilePathPrefix);
#endif

    if (!ret.contains(defaultFilePathPrefix))
        ret.prepend(defaultFilePathPrefix);
    return ret;
}

QString QSerialPortPrivate::portNameFromSystemLocation(const QString &location)
{
    QString ret = location;

#ifdef Q_OS_MAC
    ret.remove(unusedFilePathPrefix);
#endif

    ret.remove(defaultFilePathPrefix);
    return ret;
}

typedef QMap<qint32, qint32> BaudRateMap;

// The OS specific defines can be found in termios.h

static const BaudRateMap createStandardBaudRateMap()
{
    BaudRateMap baudRateMap;

#ifdef B50
    baudRateMap.insert(50, B50);
#endif

#ifdef B75
    baudRateMap.insert(75, B75);
#endif

#ifdef B110
    baudRateMap.insert(110, B110);
#endif

#ifdef B134
    baudRateMap.insert(134, B134);
#endif

#ifdef B150
    baudRateMap.insert(150, B150);
#endif

#ifdef B200
    baudRateMap.insert(200, B200);
#endif

#ifdef B300
    baudRateMap.insert(300, B300);
#endif

#ifdef B600
    baudRateMap.insert(600, B600);
#endif

#ifdef B1200
    baudRateMap.insert(1200, B1200);
#endif

#ifdef B1800
    baudRateMap.insert(1800, B1800);
#endif

#ifdef B2400
    baudRateMap.insert(2400, B2400);
#endif

#ifdef B4800
    baudRateMap.insert(4800, B4800);
#endif

#ifdef B9600
    baudRateMap.insert(9600, B9600);
#endif

#ifdef B19200
    baudRateMap.insert(19200, B19200);
#endif

#ifdef B38400
    baudRateMap.insert(38400, B38400);
#endif

#ifdef B57600
    baudRateMap.insert(57600, B57600);
#endif

#ifdef B115200
    baudRateMap.insert(115200, B115200);
#endif

#ifdef B230400
    baudRateMap.insert(230400, B230400);
#endif

#ifdef B460800
    baudRateMap.insert(460800, B460800);
#endif

#ifdef B500000
    baudRateMap.insert(500000, B500000);
#endif

#ifdef B576000
    baudRateMap.insert(576000, B576000);
#endif

#ifdef B921600
    baudRateMap.insert(921600, B921600);
#endif

#ifdef B1000000
    baudRateMap.insert(1000000, B1000000);
#endif

#ifdef B1152000
    baudRateMap.insert(1152000, B1152000);
#endif

#ifdef B1500000
    baudRateMap.insert(1500000, B1500000);
#endif

#ifdef B2000000
    baudRateMap.insert(2000000, B2000000);
#endif

#ifdef B2500000
    baudRateMap.insert(2500000, B2500000);
#endif

#ifdef B3000000
    baudRateMap.insert(3000000, B3000000);
#endif

#ifdef B3500000
    baudRateMap.insert(3500000, B3500000);
#endif

#ifdef B4000000
    baudRateMap.insert(4000000, B4000000);
#endif

    return baudRateMap;
}

static const BaudRateMap& standardBaudRateMap()
{
    static const BaudRateMap baudRateMap = createStandardBaudRateMap();
    return baudRateMap;
}

qint32 QSerialPortPrivate::baudRateFromSetting(qint32 setting)
{
    return standardBaudRateMap().key(setting);
}

qint32 QSerialPortPrivate::settingFromBaudRate(qint32 baudRate)
{
    return standardBaudRateMap().value(baudRate);
}

QList<qint32> QSerialPortPrivate::standardBaudRates()
{
    return standardBaudRateMap().keys();
}

QT_END_NAMESPACE