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39
40#ifndef QFILESYSTEMWATCHER_FSEVENTS_P_H
41#define QFILESYSTEMWATCHER_FSEVENTS_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include "qfilesystemwatcher_p.h"
55
56#include <QtCore/qmutex.h>
57#include <QtCore/qhash.h>
58#include <QtCore/qthread.h>
59#include <QtCore/qvector.h>
60#include <QtCore/qsocketnotifier.h>
61
62#include <dispatch/dispatch.h>
63#include <CoreServices/CoreServices.h>
64
65QT_REQUIRE_CONFIG(filesystemwatcher);
66
67QT_BEGIN_NAMESPACE
68
69class QFseventsFileSystemWatcherEngine : public QFileSystemWatcherEngine
70{
71 Q_OBJECT
72public:
73 ~QFseventsFileSystemWatcherEngine();
74
75 static QFseventsFileSystemWatcherEngine *create(QObject *parent);
76
77 QStringList addPaths(const QStringList &paths, QStringList *files, QStringList *directories);
78 QStringList removePaths(const QStringList &paths, QStringList *files, QStringList *directories);
79
80 void processEvent(ConstFSEventStreamRef streamRef, size_t numEvents, char **eventPaths, const FSEventStreamEventFlags eventFlags[], const FSEventStreamEventId eventIds[]);
81
82Q_SIGNALS:
83 void emitFileChanged(const QString &path, bool removed);
84 void emitDirectoryChanged(const QString &path, bool removed);
85 void scheduleStreamRestart();
86
87private slots:
88 void doEmitFileChanged(const QString &path, bool removed);
89 void doEmitDirectoryChanged(const QString &path, bool removed);
90 bool restartStream();
91
92private:
93 struct Info {
94 QString origPath;
95 timespec ctime;
96 mode_t mode;
97 QString watchedPath;
98
99 Info(): mode(0)
100 {
101 ctime.tv_sec = 0;
102 ctime.tv_nsec = 0;
103 }
104
105 Info(const QString &origPath, const timespec &ctime, mode_t mode, const QString &watchedPath)
106 : origPath(origPath)
107 , ctime(ctime)
108 , mode(mode)
109 , watchedPath(watchedPath)
110 {}
111 };
112 typedef QHash<QString, Info> InfoByName;
113 typedef QHash<QString, InfoByName> FilesByPath;
114 struct DirInfo {
115 Info dirInfo;
116 InfoByName entries;
117 };
118 typedef QHash<QString, DirInfo> DirsByName;
119 typedef QHash<QString, qint64> PathRefCounts;
120
121 struct WatchingState {
122 // These fields go hand-in-hand. FSEvents watches paths, and there is no use in watching
123 // the same path multiple times. So, the "refcount" on a path is the number of watched
124 // files that have the same path, plus the number of directories that have the same path.
125 //
126 // If the stream fails to start after adding files/directories, the watcher will try to
127 // keep watching files/directories that it was already watching. It does that by restoring
128 // the previous WatchingState and restarting the stream.
129 FilesByPath watchedFiles;
130 DirsByName watchedDirectories;
131 PathRefCounts watchedPaths;
132 };
133
134 QFseventsFileSystemWatcherEngine(QObject *parent);
135 bool startStream();
136 void stopStream(bool isStopped = false);
137 InfoByName scanForDirEntries(const QString &path);
138 bool derefPath(const QString &watchedPath);
139 bool checkDir(DirsByName::iterator &it);
140 bool rescanDirs(const QString &path);
141 bool rescanFiles(InfoByName &filesInPath);
142 bool rescanFiles(const QString &path);
143
144 QMutex lock;
145 dispatch_queue_t queue;
146 FSEventStreamRef stream;
147 FSEventStreamEventId lastReceivedEvent;
148 WatchingState watchingState;
149};
150
151QT_END_NAMESPACE
152
153#endif // QFILESYSTEMWATCHER_FSEVENTS_P_H
154

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