summaryrefslogtreecommitdiffstats
path: root/src/corelib/io/qprocess_win.cpp
blob: 1a5e6a9e592daded926785319fc07bf074fe35e9 (plain)
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
432
433
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
464
465
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
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qprocess.h"
#include "qprocess_p.h"
#include "qwindowspipereader_p.h"
#include "qwindowspipewriter_p.h"

#include <qdatetime.h>
#include <qdir.h>
#include <qelapsedtimer.h>
#include <qfileinfo.h>
#include <qregexp.h>
#include <qtimer.h>
#include <qwineventnotifier.h>
#include <private/qthread_p.h>
#include <qdebug.h>

#include "private/qfsfileengine_p.h" // for longFileName


#ifndef QT_NO_PROCESS

QT_BEGIN_NAMESPACE

//#define QPROCESS_DEBUG

#define NOTIFYTIMEOUT 100

static void qt_create_pipe(Q_PIPE *pipe, bool isInputPipe)
{
    // Anomymous pipes do not support asynchronous I/O. Thus we
    // create named pipes for redirecting stdout, stderr and stdin.

    SECURITY_ATTRIBUTES secAtt = { 0 };
    secAtt.nLength = sizeof(secAtt);
    secAtt.bInheritHandle = isInputPipe;    // The read handle must be non-inheritable for output pipes.

    HANDLE hRead;
    wchar_t pipeName[256];
    unsigned int attempts = 1000;
    forever {
        // ### The user must make sure to call qsrand() to make the pipe names less predictable.
        // ### Replace the call to qrand() with a secure version, once we have it in Qt.
        swprintf_s(pipeName, sizeof(pipeName) / sizeof(wchar_t), L"\\\\.\\pipe\\qt-%X", qrand());

        const DWORD dwPipeBufferSize = 1024 * 1024;
        hRead = CreateNamedPipe(pipeName,
                                PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED,
                                PIPE_TYPE_BYTE | PIPE_WAIT | PIPE_REJECT_REMOTE_CLIENTS,
                                1,                      // only one pipe instance
                                0,                      // output buffer size
                                dwPipeBufferSize,       // input buffer size
                                0,
                                &secAtt);
        if (hRead != INVALID_HANDLE_VALUE)
            break;
        DWORD dwError = GetLastError();
        if (dwError != ERROR_PIPE_BUSY || !--attempts) {
            qErrnoWarning(dwError, "QProcess: CreateNamedPipe failed.", GetLastError());
            return;
        }
    }

    // The write handle must be non-inheritable for input pipes.
    secAtt.bInheritHandle = !isInputPipe;

    HANDLE hWrite = INVALID_HANDLE_VALUE;
    hWrite = CreateFile(pipeName,
                        GENERIC_WRITE,
                        0,
                        &secAtt,
                        OPEN_EXISTING,
                        FILE_FLAG_OVERLAPPED,
                        NULL);
    if (hWrite == INVALID_HANDLE_VALUE) {
        qWarning("QProcess: CreateFile failed with error code %d.\n", GetLastError());
        CloseHandle(hRead);
        return;
    }

    // Wait until connection is in place.
    ConnectNamedPipe(hRead, NULL);

    pipe[0] = hRead;
    pipe[1] = hWrite;
}

static void duplicateStdWriteChannel(Q_PIPE *pipe, DWORD nStdHandle)
{
    pipe[0] = INVALID_Q_PIPE;
    HANDLE hStdWriteChannel = GetStdHandle(nStdHandle);
    HANDLE hCurrentProcess = GetCurrentProcess();
    DuplicateHandle(hCurrentProcess, hStdWriteChannel, hCurrentProcess,
                    &pipe[1], 0, TRUE, DUPLICATE_SAME_ACCESS);
}

/*
    Create the pipes to a QProcessPrivate::Channel.

    This function must be called in order: stdin, stdout, stderr
*/
bool QProcessPrivate::createChannel(Channel &channel)
{
    Q_Q(QProcess);

    if (&channel == &stderrChannel && processChannelMode == QProcess::MergedChannels) {
        return DuplicateHandle(GetCurrentProcess(), stdoutChannel.pipe[1], GetCurrentProcess(),
                               &stderrChannel.pipe[1], 0, TRUE, DUPLICATE_SAME_ACCESS);
    }

    if (channel.type == Channel::Normal) {
        // we're piping this channel to our own process
        const bool isStdInChannel = (&channel == &stdinChannel);
        if (isStdInChannel || processChannelMode != QProcess::ForwardedChannels)
            qt_create_pipe(channel.pipe, isStdInChannel);
        else
            duplicateStdWriteChannel(channel.pipe, (&channel == &stdoutChannel) ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);

        QWindowsPipeReader *pipeReader = 0;
        if (&channel == &stdoutChannel) {
            if (!stdoutReader) {
                stdoutReader = new QWindowsPipeReader(q);
                q->connect(stdoutReader, SIGNAL(readyRead()), SLOT(_q_canReadStandardOutput()));
            }
            pipeReader = stdoutReader;
        } else if (&channel == &stderrChannel) {
            if (!stderrReader) {
                stderrReader = new QWindowsPipeReader(q);
                q->connect(stderrReader, SIGNAL(readyRead()), SLOT(_q_canReadStandardError()));
            }
            pipeReader = stderrReader;
        }
        if (pipeReader) {
            pipeReader->setHandle(channel.pipe[0]);
            pipeReader->startAsyncRead();
        }

        return true;
    } else if (channel.type == Channel::Redirect) {
        // we're redirecting the channel to/from a file
        SECURITY_ATTRIBUTES secAtt = { sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };

        if (&channel == &stdinChannel) {
            // try to open in read-only mode
            channel.pipe[1] = INVALID_Q_PIPE;
            channel.pipe[0] =
                CreateFile((const wchar_t*)QFSFileEnginePrivate::longFileName(channel.file).utf16(),
                           GENERIC_READ,
                           FILE_SHARE_READ | FILE_SHARE_WRITE,
                           &secAtt,
                           OPEN_EXISTING,
                           FILE_ATTRIBUTE_NORMAL,
                           NULL);

            if (channel.pipe[0] != INVALID_Q_PIPE)
                return true;

            q->setErrorString(QProcess::tr("Could not open input redirection for reading"));
        } else {
            // open in write mode
            channel.pipe[0] = INVALID_Q_PIPE;
            channel.pipe[1] =
                CreateFile((const wchar_t *)QFSFileEnginePrivate::longFileName(channel.file).utf16(),
                           GENERIC_WRITE,
                           FILE_SHARE_READ | FILE_SHARE_WRITE,
                           &secAtt,
                           channel.append ? OPEN_ALWAYS : CREATE_ALWAYS,
                           FILE_ATTRIBUTE_NORMAL,
                           NULL);

            if (channel.pipe[1] != INVALID_Q_PIPE) {
                if (channel.append) {
                    SetFilePointer(channel.pipe[1], 0, NULL, FILE_END);
                }
                return true;
            }

            q->setErrorString(QProcess::tr("Could not open output redirection for writing"));
        }

        // could not open file
        processError = QProcess::FailedToStart;
        emit q->error(processError);
        cleanup();
        return false;
    } else {
        Q_ASSERT_X(channel.process, "QProcess::start", "Internal error");

        Channel *source;
        Channel *sink;

        if (channel.type == Channel::PipeSource) {
            // we are the source
            source = &channel;
            sink = &channel.process->stdinChannel;

            if (source->pipe[1] != INVALID_Q_PIPE) {
                // already constructed by the sink
                // make it inheritable
                HANDLE tmpHandle = source->pipe[1];
                if (!DuplicateHandle(GetCurrentProcess(), tmpHandle,
                                     GetCurrentProcess(), &source->pipe[1],
                                     0, TRUE, DUPLICATE_SAME_ACCESS))
                    return false;

                CloseHandle(tmpHandle);
                return true;
            }

            Q_ASSERT(source == &stdoutChannel);
            Q_ASSERT(sink->process == this && sink->type == Channel::PipeSink);

            qt_create_pipe(source->pipe, /* in = */ false); // source is stdout
            sink->pipe[0] = source->pipe[0];
            source->pipe[0] = INVALID_Q_PIPE;

            return true;
        } else {
            // we are the sink;
            source = &channel.process->stdoutChannel;
            sink = &channel;

            if (sink->pipe[0] != INVALID_Q_PIPE) {
                // already constructed by the source
                // make it inheritable
                HANDLE tmpHandle = sink->pipe[0];
                if (!DuplicateHandle(GetCurrentProcess(), tmpHandle,
                                     GetCurrentProcess(), &sink->pipe[0],
                                     0, TRUE, DUPLICATE_SAME_ACCESS))
                    return false;

                CloseHandle(tmpHandle);
                return true;
            }
            Q_ASSERT(sink == &stdinChannel);
            Q_ASSERT(source->process == this && source->type == Channel::PipeSource);

            qt_create_pipe(sink->pipe, /* in = */ true); // sink is stdin
            source->pipe[1] = sink->pipe[1];
            sink->pipe[1] = INVALID_Q_PIPE;

            return true;
        }
    }
}

void QProcessPrivate::destroyPipe(Q_PIPE pipe[2])
{
    if (pipe[0] != INVALID_Q_PIPE) {
        CloseHandle(pipe[0]);
        pipe[0] = INVALID_Q_PIPE;
    }
    if (pipe[1] != INVALID_Q_PIPE) {
        CloseHandle(pipe[1]);
        pipe[1] = INVALID_Q_PIPE;
    }
}

void QProcessPrivate::destroyChannel(Channel *channel)
{
    if (channel == &stdinChannel) {
        if (pipeWriter) {
            delete pipeWriter;
            pipeWriter = 0;
        }
    } else if (channel == &stdoutChannel) {
        if (stdoutReader) {
            stdoutReader->deleteLater();
            stdoutReader = 0;
        }
    } else if (channel == &stderrChannel) {
        if (stderrReader) {
            stderrReader->deleteLater();
            stderrReader = 0;
        }
    }
    destroyPipe(channel->pipe);
}

static QString qt_create_commandline(const QString &program, const QStringList &arguments)
{
    QString args;
    if (!program.isEmpty()) {
        QString programName = program;
        if (!programName.startsWith(QLatin1Char('\"')) && !programName.endsWith(QLatin1Char('\"')) && programName.contains(QLatin1Char(' ')))
            programName = QLatin1Char('\"') + programName + QLatin1Char('\"');
        programName.replace(QLatin1Char('/'), QLatin1Char('\\'));

        // add the prgram as the first arg ... it works better
        args = programName + QLatin1Char(' ');
    }

    for (int i=0; i<arguments.size(); ++i) {
        QString tmp = arguments.at(i);
        // Quotes are escaped and their preceding backslashes are doubled.
        tmp.replace(QRegExp(QLatin1String("(\\\\*)\"")), QLatin1String("\\1\\1\\\""));
        if (tmp.isEmpty() || tmp.contains(QLatin1Char(' ')) || tmp.contains(QLatin1Char('\t'))) {
            // The argument must not end with a \ since this would be interpreted
            // as escaping the quote -- rather put the \ behind the quote: e.g.
            // rather use "foo"\ than "foo\"
            int i = tmp.length();
            while (i > 0 && tmp.at(i - 1) == QLatin1Char('\\'))
                --i;
            tmp.insert(i, QLatin1Char('"'));
            tmp.prepend(QLatin1Char('"'));
        }
        args += QLatin1Char(' ') + tmp;
    }
    return args;
}

QProcessEnvironment QProcessEnvironment::systemEnvironment()
{
    QProcessEnvironment env;
    // Calls to setenv() affect the low-level environment as well.
    // This is not the case the other way round.
    if (wchar_t *envStrings = GetEnvironmentStringsW()) {
        for (const wchar_t *entry = envStrings; *entry; ) {
            const int entryLen = int(wcslen(entry));
            if (const wchar_t *equal = wcschr(entry, L'=')) {
                int nameLen = equal - entry;
                QString name = QString::fromWCharArray(entry, nameLen);
                QString value = QString::fromWCharArray(equal + 1, entryLen - nameLen - 1);
                env.d->hash.insert(QProcessEnvironmentPrivate::Key(name), value);
            }
            entry += entryLen + 1;
        }
        FreeEnvironmentStringsW(envStrings);
    }
    return env;
}

static QByteArray qt_create_environment(const QProcessEnvironmentPrivate::Hash &environment)
{
    QByteArray envlist;
    if (!environment.isEmpty()) {
        QProcessEnvironmentPrivate::Hash copy = environment;

        // add PATH if necessary (for DLL loading)
        QProcessEnvironmentPrivate::Key pathKey(QLatin1String("PATH"));
        if (!copy.contains(pathKey)) {
            QByteArray path = qgetenv("PATH");
            if (!path.isEmpty())
                copy.insert(pathKey, QString::fromLocal8Bit(path));
        }

        // add systemroot if needed
        QProcessEnvironmentPrivate::Key rootKey(QLatin1String("SystemRoot"));
        if (!copy.contains(rootKey)) {
            QByteArray systemRoot = qgetenv("SystemRoot");
            if (!systemRoot.isEmpty())
                copy.insert(rootKey, QString::fromLocal8Bit(systemRoot));
        }

        int pos = 0;
        QProcessEnvironmentPrivate::Hash::ConstIterator it = copy.constBegin(),
                                                       end = copy.constEnd();

        static const wchar_t equal = L'=';
        static const wchar_t nul = L'\0';

        for ( ; it != end; ++it) {
            uint tmpSize = sizeof(wchar_t) * (it.key().length() + it.value().length() + 2);
            // ignore empty strings
            if (tmpSize == sizeof(wchar_t) * 2)
                continue;
            envlist.resize(envlist.size() + tmpSize);

            tmpSize = it.key().length() * sizeof(wchar_t);
            memcpy(envlist.data()+pos, it.key().utf16(), tmpSize);
            pos += tmpSize;

            memcpy(envlist.data()+pos, &equal, sizeof(wchar_t));
            pos += sizeof(wchar_t);

            tmpSize = it.value().length() * sizeof(wchar_t);
            memcpy(envlist.data()+pos, it.value().utf16(), tmpSize);
            pos += tmpSize;

            memcpy(envlist.data()+pos, &nul, sizeof(wchar_t));
            pos += sizeof(wchar_t);
        }
        // add the 2 terminating 0 (actually 4, just to be on the safe side)
        envlist.resize( envlist.size()+4 );
        envlist[pos++] = 0;
        envlist[pos++] = 0;
        envlist[pos++] = 0;
        envlist[pos++] = 0;
    }
    return envlist;
}

void QProcessPrivate::startProcess()
{
    Q_Q(QProcess);

    bool success = false;

    if (pid) {
        CloseHandle(pid->hThread);
        CloseHandle(pid->hProcess);
        delete pid;
        pid = 0;
    }
    pid = new PROCESS_INFORMATION;
    memset(pid, 0, sizeof(PROCESS_INFORMATION));

    q->setProcessState(QProcess::Starting);

    if (!createChannel(stdinChannel) ||
        !createChannel(stdoutChannel) ||
        !createChannel(stderrChannel))
        return;

    QString args = qt_create_commandline(program, arguments);
    QByteArray envlist;
    if (environment.d.constData())
        envlist = qt_create_environment(environment.d.constData()->hash);
    if (!nativeArguments.isEmpty()) {
        if (!args.isEmpty())
             args += QLatin1Char(' ');
        args += nativeArguments;
    }

#if defined QPROCESS_DEBUG
    qDebug("Creating process");
    qDebug("   program : [%s]", program.toLatin1().constData());
    qDebug("   args : %s", args.toLatin1().constData());
    qDebug("   pass environment : %s", environment.isEmpty() ? "no" : "yes");
#endif

    DWORD dwCreationFlags = CREATE_NO_WINDOW;
    dwCreationFlags |= CREATE_UNICODE_ENVIRONMENT;
    STARTUPINFOW startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
                                 0, 0, 0,
                                 STARTF_USESTDHANDLES,
                                 0, 0, 0,
                                 stdinChannel.pipe[0], stdoutChannel.pipe[1], stderrChannel.pipe[1]
    };
    success = CreateProcess(0, (wchar_t*)args.utf16(),
                            0, 0, TRUE, dwCreationFlags,
                            environment.isEmpty() ? 0 : envlist.data(),
                            workingDirectory.isEmpty() ? 0 : (wchar_t*)QDir::toNativeSeparators(workingDirectory).utf16(),
                            &startupInfo, pid);
    if (!success) {
        // Capture the error string before we do CloseHandle below
        q->setErrorString(QProcess::tr("Process failed to start: %1").arg(qt_error_string()));
    }

    if (stdinChannel.pipe[0] != INVALID_Q_PIPE) {
        CloseHandle(stdinChannel.pipe[0]);
        stdinChannel.pipe[0] = INVALID_Q_PIPE;
    }
    if (stdoutChannel.pipe[1] != INVALID_Q_PIPE) {
        CloseHandle(stdoutChannel.pipe[1]);
        stdoutChannel.pipe[1] = INVALID_Q_PIPE;
    }
    if (stderrChannel.pipe[1] != INVALID_Q_PIPE) {
        CloseHandle(stderrChannel.pipe[1]);
        stderrChannel.pipe[1] = INVALID_Q_PIPE;
    }

    if (!success) {
        cleanup();
        processError = QProcess::FailedToStart;
        emit q->error(processError);
        q->setProcessState(QProcess::NotRunning);
        return;
    }

    q->setProcessState(QProcess::Running);
    // User can call kill()/terminate() from the stateChanged() slot
    // so check before proceeding 
    if (!pid) 
        return;

    if (threadData->eventDispatcher) {
        processFinishedNotifier = new QWinEventNotifier(pid->hProcess, q);
        QObject::connect(processFinishedNotifier, SIGNAL(activated(HANDLE)), q, SLOT(_q_processDied()));
        processFinishedNotifier->setEnabled(true);
        notifier = new QTimer(q);
        QObject::connect(notifier, SIGNAL(timeout()), q, SLOT(_q_notified()));
        notifier->start(NOTIFYTIMEOUT);
    }

    // give the process a chance to start ...
    Sleep(SLEEPMIN * 2);
    _q_startupNotification();
}

bool QProcessPrivate::processStarted()
{
    return processState == QProcess::Running;
}

qint64 QProcessPrivate::bytesAvailableFromStdout() const
{
    if (stdoutChannel.pipe[0] == INVALID_Q_PIPE)
        return 0;

    if (!stdoutReader)
        return 0;

    DWORD bytesAvail = stdoutReader->bytesAvailable();
#if defined QPROCESS_DEBUG
    qDebug("QProcessPrivate::bytesAvailableFromStdout() == %d", bytesAvail);
#endif
    return bytesAvail;
}

qint64 QProcessPrivate::bytesAvailableFromStderr() const
{
    if (stderrChannel.pipe[0] == INVALID_Q_PIPE)
        return 0;

    if (!stderrReader)
        return 0;

    DWORD bytesAvail = stderrReader->bytesAvailable();
#if defined QPROCESS_DEBUG
    qDebug("QProcessPrivate::bytesAvailableFromStderr() == %d", bytesAvail);
#endif
    return bytesAvail;
}

qint64 QProcessPrivate::readFromStdout(char *data, qint64 maxlen)
{
    return stdoutReader ? stdoutReader->read(data, maxlen) : 0;
}

qint64 QProcessPrivate::readFromStderr(char *data, qint64 maxlen)
{
    return stderrReader ? stderrReader->read(data, maxlen) : 0;
}


static BOOL QT_WIN_CALLBACK qt_terminateApp(HWND hwnd, LPARAM procId)
{
    DWORD currentProcId = 0;
    GetWindowThreadProcessId(hwnd, &currentProcId);
    if (currentProcId == (DWORD)procId)
	    PostMessage(hwnd, WM_CLOSE, 0, 0);

    return TRUE;
}

void QProcessPrivate::terminateProcess()
{
    if (pid) {
        EnumWindows(qt_terminateApp, (LPARAM)pid->dwProcessId);
        PostThreadMessage(pid->dwThreadId, WM_CLOSE, 0, 0);
    }
}

void QProcessPrivate::killProcess()
{
    if (pid)
        TerminateProcess(pid->hProcess, 0xf291);
}

bool QProcessPrivate::waitForStarted(int)
{
    Q_Q(QProcess);

    if (processStarted())
        return true;

    if (processError == QProcess::FailedToStart)
        return false;

    processError = QProcess::Timedout;
    q->setErrorString(QProcess::tr("Process operation timed out"));
    return false;
}

static bool drainOutputPipes(QProcessPrivate *d)
{
    if (!d->stdoutReader && !d->stderrReader)
        return false;

    bool readyReadEmitted = false;
    forever {
        bool readOperationActive = false;
        if (d->stdoutReader) {
            readyReadEmitted |= d->stdoutReader->waitForReadyRead(0);
            readOperationActive = d->stdoutReader->isReadOperationActive();
        }
        if (d->stderrReader) {
            readyReadEmitted |= d->stderrReader->waitForReadyRead(0);
            readOperationActive |= d->stderrReader->isReadOperationActive();
        }
        if (!readOperationActive)
            break;
        Sleep(100);
    }

    return readyReadEmitted;
}

bool QProcessPrivate::waitForReadyRead(int msecs)
{
    Q_Q(QProcess);

    QIncrementalSleepTimer timer(msecs);

    forever {
        if (!writeBuffer.isEmpty() && !_q_canWrite())
            return false;
        if (pipeWriter && pipeWriter->waitForWrite(0))
            timer.resetIncrements();

        if (processChannelMode != QProcess::ForwardedChannels
                && ((stdoutReader && stdoutReader->waitForReadyRead(0))
                    || (stderrReader && stderrReader->waitForReadyRead(0))))
            return true;

        if (!pid)
            return false;
        if (WaitForSingleObject(pid->hProcess, 0) == WAIT_OBJECT_0) {
            bool readyReadEmitted = drainOutputPipes(this);
            _q_processDied();
            return readyReadEmitted;
        }

        Sleep(timer.nextSleepTime());
        if (timer.hasTimedOut())
            break;
    }

    processError = QProcess::Timedout;
    q->setErrorString(QProcess::tr("Process operation timed out"));
    return false;
}

bool QProcessPrivate::waitForBytesWritten(int msecs)
{
    Q_Q(QProcess);

    QIncrementalSleepTimer timer(msecs);

    forever {
        // Check if we have any data pending: the pipe writer has
        // bytes waiting to written, or it has written data since the
        // last time we called pipeWriter->waitForWrite().
        bool pendingDataInPipe = pipeWriter && (pipeWriter->bytesToWrite() || pipeWriter->hadWritten());

        // If we don't have pending data, and our write buffer is
        // empty, we fail.
        if (!pendingDataInPipe && writeBuffer.isEmpty())
            return false;

        // If we don't have pending data and we do have data in our
        // write buffer, try to flush that data over to the pipe
        // writer.  Fail on error.
        if (!pendingDataInPipe) {
            if (!_q_canWrite())
                return false;
        }

        // Wait for the pipe writer to acknowledge that it has
        // written. This will succeed if either the pipe writer has
        // already written the data, or if it manages to write data
        // within the given timeout. If the write buffer was non-empty
        // and the pipeWriter is now dead, that means _q_canWrite()
        // destroyed the writer after it successfully wrote the last
        // batch.
        if (!pipeWriter || pipeWriter->waitForWrite(0))
            return true;

        // If we wouldn't write anything, check if we can read stdout.
        if (bytesAvailableFromStdout() != 0) {
            _q_canReadStandardOutput();
            timer.resetIncrements();
        }

        // Check if we can read stderr.
        if (bytesAvailableFromStderr() != 0) {
            _q_canReadStandardError();
            timer.resetIncrements();
        }

        // Check if the process died while reading.
        if (!pid)
            return false;

        // Wait for the process to signal any change in its state,
        // such as incoming data, or if the process died.
        if (WaitForSingleObject(pid->hProcess, 0) == WAIT_OBJECT_0) {
            _q_processDied();
            return false;
        }

        // Only wait for as long as we've been asked.
        if (timer.hasTimedOut())
            break;
    }

    processError = QProcess::Timedout;
    q->setErrorString(QProcess::tr("Process operation timed out"));
    return false;
}

bool QProcessPrivate::waitForFinished(int msecs)
{
    Q_Q(QProcess);
#if defined QPROCESS_DEBUG
    qDebug("QProcessPrivate::waitForFinished(%d)", msecs);
#endif

    QIncrementalSleepTimer timer(msecs);

    forever {
        if (!writeBuffer.isEmpty() && !_q_canWrite())
            return false;
        if (pipeWriter && pipeWriter->waitForWrite(0))
            timer.resetIncrements();
        if (stdoutReader && stdoutReader->waitForReadyRead(0))
            timer.resetIncrements();
        if (stderrReader && stderrReader->waitForReadyRead(0))
            timer.resetIncrements();

        if (!pid) {
            drainOutputPipes(this);
            return true;
        }

        if (WaitForSingleObject(pid->hProcess, timer.nextSleepTime()) == WAIT_OBJECT_0) {
            drainOutputPipes(this);
            _q_processDied();
            return true;
        }

        if (timer.hasTimedOut())
            break;
    }

    processError = QProcess::Timedout;
    q->setErrorString(QProcess::tr("Process operation timed out"));
    return false;
}


void QProcessPrivate::findExitCode()
{
    DWORD theExitCode;
    if (GetExitCodeProcess(pid->hProcess, &theExitCode)) {
        exitCode = theExitCode;
        //### for now we assume a crash if exit code is less than -1 or the magic number
        crashed = (exitCode == 0xf291 || (int)exitCode < 0);
    }
}

void QProcessPrivate::flushPipeWriter()
{
    if (pipeWriter && pipeWriter->bytesToWrite() > 0) {
        pipeWriter->waitForWrite(ULONG_MAX);
    }
}

qint64 QProcessPrivate::pipeWriterBytesToWrite() const
{
    return pipeWriter ? pipeWriter->bytesToWrite() : qint64(0);
}

qint64 QProcessPrivate::writeToStdin(const char *data, qint64 maxlen)
{
    Q_Q(QProcess);

    if (!pipeWriter) {
        pipeWriter = new QWindowsPipeWriter(stdinChannel.pipe[1], q);
        pipeWriter->start();
    }

    return pipeWriter->write(data, maxlen);
}

bool QProcessPrivate::waitForWrite(int msecs)
{
    Q_Q(QProcess);

    if (!pipeWriter || pipeWriter->waitForWrite(msecs))
        return true;

    processError = QProcess::Timedout;
    q->setErrorString(QProcess::tr("Process operation timed out"));
    return false;
}

void QProcessPrivate::_q_notified()
{
    notifier->stop();

    if (!writeBuffer.isEmpty() && (!pipeWriter || pipeWriter->waitForWrite(0)))
        _q_canWrite();

    if (processState != QProcess::NotRunning)
        notifier->start(NOTIFYTIMEOUT);
}

bool QProcessPrivate::startDetached(const QString &program, const QStringList &arguments, const QString &workingDir, qint64 *pid)
{
    QString args = qt_create_commandline(program, arguments);
    bool success = false;
    PROCESS_INFORMATION pinfo;

    STARTUPINFOW startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
                                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
                               };
    success = CreateProcess(0, (wchar_t*)args.utf16(),
                            0, 0, FALSE, CREATE_UNICODE_ENVIRONMENT | CREATE_NEW_CONSOLE, 0,
                            workingDir.isEmpty() ? 0 : (wchar_t*)workingDir.utf16(),
                            &startupInfo, &pinfo);

    if (success) {
        CloseHandle(pinfo.hThread);
        CloseHandle(pinfo.hProcess);
        if (pid)
            *pid = pinfo.dwProcessId;
    }

    return success;
}

QT_END_NAMESPACE

#endif // QT_NO_PROCESS