summaryrefslogtreecommitdiffstats
path: root/src/corelib/io/qfilesystemwatcher_inotify.cpp
blob: 0b4ba61f572a7513100a8fd5caee7eb680cf572c (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
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore 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 "qfilesystemwatcher.h"
#include "qfilesystemwatcher_inotify_p.h"

#ifndef QT_NO_FILESYSTEMWATCHER

#include "private/qcore_unix_p.h"

#include <qdebug.h>
#include <qfile.h>
#include <qfileinfo.h>
#include <qsocketnotifier.h>
#include <qvarlengtharray.h>

#if defined(Q_OS_LINUX)
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#endif

#if defined(QT_NO_INOTIFY)

#if defined(Q_OS_QNX)
// These files should only be compiled on QNX if the inotify headers are found
#error "Should not get here."
#endif

#include <linux/types.h>

#if defined(__i386__)
# define __NR_inotify_init      291
# define __NR_inotify_add_watch 292
# define __NR_inotify_rm_watch  293
# define __NR_inotify_init1     332
#elif defined(__x86_64__)
# define __NR_inotify_init      253
# define __NR_inotify_add_watch 254
# define __NR_inotify_rm_watch  255
# define __NR_inotify_init1     294
#elif defined(__powerpc__) || defined(__powerpc64__)
# define __NR_inotify_init      275
# define __NR_inotify_add_watch 276
# define __NR_inotify_rm_watch  277
# define __NR_inotify_init1     318
#elif defined (__ia64__)
# define __NR_inotify_init      1277
# define __NR_inotify_add_watch 1278
# define __NR_inotify_rm_watch  1279
# define __NR_inotify_init1     1318
#elif defined (__s390__) || defined (__s390x__)
# define __NR_inotify_init      284
# define __NR_inotify_add_watch 285
# define __NR_inotify_rm_watch  286
# define __NR_inotify_init1     324
#elif defined (__alpha__)
# define __NR_inotify_init      444
# define __NR_inotify_add_watch 445
# define __NR_inotify_rm_watch  446
// no inotify_init1 for the Alpha
#elif defined (__sparc__) || defined (__sparc64__)
# define __NR_inotify_init      151
# define __NR_inotify_add_watch 152
# define __NR_inotify_rm_watch  156
# define __NR_inotify_init1     322
#elif defined (__arm__)
# define __NR_inotify_init      316
# define __NR_inotify_add_watch 317
# define __NR_inotify_rm_watch  318
# define __NR_inotify_init1     360
#elif defined (__sh__)
# define __NR_inotify_init      290
# define __NR_inotify_add_watch 291
# define __NR_inotify_rm_watch  292
# define __NR_inotify_init1     332
#elif defined (__sh64__)
# define __NR_inotify_init      318
# define __NR_inotify_add_watch 319
# define __NR_inotify_rm_watch  320
# define __NR_inotify_init1     360
#elif defined (__mips__)
# define __NR_inotify_init      284
# define __NR_inotify_add_watch 285
# define __NR_inotify_rm_watch  286
# define __NR_inotify_init1     329
#elif defined (__hppa__)
# define __NR_inotify_init      269
# define __NR_inotify_add_watch 270
# define __NR_inotify_rm_watch  271
# define __NR_inotify_init1     314
#elif defined (__avr32__)
# define __NR_inotify_init	240
# define __NR_inotify_add_watch	241
# define __NR_inotify_rm_watch	242
// no inotify_init1 for AVR32
#elif defined (__mc68000__)
# define __NR_inotify_init      284
# define __NR_inotify_add_watch 285
# define __NR_inotify_rm_watch  286
# define __NR_inotify_init1     328
#else
# error "This architecture is not supported. Please talk to qt-bugs@trolltech.com"
#endif

#if !defined(IN_CLOEXEC) && defined(O_CLOEXEC) && defined(__NR_inotify_init1)
# define IN_CLOEXEC              O_CLOEXEC
#endif

QT_BEGIN_NAMESPACE

#ifdef QT_LINUXBASE
// ### the LSB doesn't standardize syscall, need to wait until glib2.4 is standardized
static inline int syscall(...) { return -1; }
#endif

static inline int inotify_init()
{
    return syscall(__NR_inotify_init);
}

static inline int inotify_add_watch(int fd, const char *name, __u32 mask)
{
    return syscall(__NR_inotify_add_watch, fd, name, mask);
}

static inline int inotify_rm_watch(int fd, __u32 wd)
{
    return syscall(__NR_inotify_rm_watch, fd, wd);
}

#ifdef IN_CLOEXEC
static inline int inotify_init1(int flags)
{
    return syscall(__NR_inotify_init1, flags);
}
#endif

// the following struct and values are documented in linux/inotify.h
extern "C" {

struct inotify_event {
        __s32           wd;
        __u32           mask;
        __u32           cookie;
        __u32           len;
        char            name[0];
};

#define IN_ACCESS               0x00000001
#define IN_MODIFY               0x00000002
#define IN_ATTRIB               0x00000004
#define IN_CLOSE_WRITE          0x00000008
#define IN_CLOSE_NOWRITE        0x00000010
#define IN_OPEN                 0x00000020
#define IN_MOVED_FROM           0x00000040
#define IN_MOVED_TO             0x00000080
#define IN_CREATE               0x00000100
#define IN_DELETE               0x00000200
#define IN_DELETE_SELF          0x00000400
#define IN_MOVE_SELF            0x00000800
#define IN_UNMOUNT              0x00002000
#define IN_Q_OVERFLOW           0x00004000
#define IN_IGNORED              0x00008000

#define IN_CLOSE                (IN_CLOSE_WRITE | IN_CLOSE_NOWRITE)
#define IN_MOVE                 (IN_MOVED_FROM | IN_MOVED_TO)
}

QT_END_NAMESPACE

// --------- inotify.h end ----------

#else /* QT_NO_INOTIFY */

#include <sys/inotify.h>

#endif

QT_BEGIN_NAMESPACE

QInotifyFileSystemWatcherEngine *QInotifyFileSystemWatcherEngine::create()
{
    register int fd = -1;
#ifdef IN_CLOEXEC
    fd = inotify_init1(IN_CLOEXEC);
#endif
    if (fd == -1) {
        fd = inotify_init();
        if (fd == -1)
            return 0;
        ::fcntl(fd, F_SETFD, FD_CLOEXEC);
    }
    return new QInotifyFileSystemWatcherEngine(fd);
}

QInotifyFileSystemWatcherEngine::QInotifyFileSystemWatcherEngine(int fd)
    : inotifyFd(fd)
{
    fcntl(inotifyFd, F_SETFD, FD_CLOEXEC);

    moveToThread(this);
}

QInotifyFileSystemWatcherEngine::~QInotifyFileSystemWatcherEngine()
{
    foreach (int id, pathToID)
        inotify_rm_watch(inotifyFd, id < 0 ? -id : id);

    ::close(inotifyFd);
}

void QInotifyFileSystemWatcherEngine::run()
{
    QSocketNotifier sn(inotifyFd, QSocketNotifier::Read, this);
    connect(&sn, SIGNAL(activated(int)), SLOT(readFromInotify()));
    (void) exec();
}

QStringList QInotifyFileSystemWatcherEngine::addPaths(const QStringList &paths,
                                                      QStringList *files,
                                                      QStringList *directories)
{
    QMutexLocker locker(&mutex);

    QStringList p = paths;
    QMutableListIterator<QString> it(p);
    while (it.hasNext()) {
        QString path = it.next();
        QFileInfo fi(path);
        bool isDir = fi.isDir();
        if (isDir) {
            if (directories->contains(path))
                continue;
        } else {
            if (files->contains(path))
                continue;
        }

        int wd = inotify_add_watch(inotifyFd,
                                   QFile::encodeName(path),
                                   (isDir
                                    ? (0
                                       | IN_ATTRIB
                                       | IN_MOVE
                                       | IN_CREATE
                                       | IN_DELETE
                                       | IN_DELETE_SELF
                                       )
                                    : (0
                                       | IN_ATTRIB
                                       | IN_MODIFY
                                       | IN_MOVE
                                       | IN_MOVE_SELF
                                       | IN_DELETE_SELF
                                       )));
        if (wd <= 0) {
            perror("QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed");
            continue;
        }

        it.remove();

        int id = isDir ? -wd : wd;
        if (id < 0) {
            directories->append(path);
        } else {
            files->append(path);
        }

        pathToID.insert(path, id);
        idToPath.insert(id, path);
    }

    start();

    return p;
}

QStringList QInotifyFileSystemWatcherEngine::removePaths(const QStringList &paths,
                                                         QStringList *files,
                                                         QStringList *directories)
{
    QMutexLocker locker(&mutex);

    QStringList p = paths;
    QMutableListIterator<QString> it(p);
    while (it.hasNext()) {
        QString path = it.next();
        int id = pathToID.take(path);
        QString x = idToPath.take(id);
        if (x.isEmpty() || x != path)
            continue;

        int wd = id < 0 ? -id : id;
        // qDebug() << "removing watch for path" << path << "wd" << wd;
        inotify_rm_watch(inotifyFd, wd);

        it.remove();
        if (id < 0) {
            directories->removeAll(path);
        } else {
            files->removeAll(path);
        }
    }

    return p;
}

void QInotifyFileSystemWatcherEngine::stop()
{
    quit();
}

void QInotifyFileSystemWatcherEngine::readFromInotify()
{
    QMutexLocker locker(&mutex);

    // qDebug() << "QInotifyFileSystemWatcherEngine::readFromInotify";

    int buffSize = 0;
    ioctl(inotifyFd, FIONREAD, (char *) &buffSize);
    QVarLengthArray<char, 4096> buffer(buffSize);
    buffSize = read(inotifyFd, buffer.data(), buffSize);
    char *at = buffer.data();
    char * const end = at + buffSize;

    QHash<int, inotify_event *> eventForId;
    while (at < end) {
        inotify_event *event = reinterpret_cast<inotify_event *>(at);

        if (eventForId.contains(event->wd))
            eventForId[event->wd]->mask |= event->mask;
        else
            eventForId.insert(event->wd, event);

        at += sizeof(inotify_event) + event->len;
    }

    QHash<int, inotify_event *>::const_iterator it = eventForId.constBegin();
    while (it != eventForId.constEnd()) {
        const inotify_event &event = **it;
        ++it;

        // qDebug() << "inotify event, wd" << event.wd << "mask" << hex << event.mask;

        int id = event.wd;
        QString path = idToPath.value(id);
        if (path.isEmpty()) {
            // perhaps a directory?
            id = -id;
            path = idToPath.value(id);
            if (path.isEmpty())
                continue;
        }

        // qDebug() << "event for path" << path;

        if ((event.mask & (IN_DELETE_SELF | IN_MOVE_SELF | IN_UNMOUNT)) != 0) {
            pathToID.remove(path);
            idToPath.remove(id);
            inotify_rm_watch(inotifyFd, event.wd);

            if (id < 0)
                emit directoryChanged(path, true);
            else
                emit fileChanged(path, true);
        } else {
            if (id < 0)
                emit directoryChanged(path, false);
            else
                emit fileChanged(path, false);
        }
    }
}

QT_END_NAMESPACE

#endif // QT_NO_FILESYSTEMWATCHER