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#include <QtCore/QDebug>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/inotify.h>
#include "watcher.h"
Watcher::Watcher(const QString& path, QObject *parent) :
QObject(parent)
{
_fd = inotify_init();
fcntl(_fd, F_SETFL, O_NONBLOCK);
_buffer.resize(sizeof(struct inotify_event) + NAME_MAX + 1);
_mask = IN_CLOSE_WRITE | IN_CREATE | IN_DELETE |
IN_MOVED_FROM | IN_MOVED_TO | IN_ONLYDIR;
_notifier = new QSocketNotifier(_fd, QSocketNotifier::Read, this);
connect(_notifier, SIGNAL(activated(int)), SLOT(readInotify()));
// Scan directories and add watches
addWatches(scanDirs(QDir(path)));
}
void Watcher::readInotify()
{
inotify_event *event;
const ssize_t struct_size = sizeof(struct inotify_event);
ssize_t pos, nread;
do {
nread = read(_fd, _buffer.data(), _buffer.size());
if (nread < 0) {
int err = errno;
if (err == EWOULDBLOCK) return;
qWarning() << "Error while reading from inotify" << err;
}
pos = 0;
while (pos + struct_size <= nread) {
event = reinterpret_cast<inotify_event*>(&(_buffer.data()[pos]));
if (event->wd == -1) {
// Special treatment
// TODO
continue;
}
QString path = _watches[event->wd];
QString name;
QString filePath = path;
if (event->len > 0) {
name = QString::fromLocal8Bit(event->name);
filePath += "/" + name;
}
if (event->mask & (IN_CREATE|IN_MOVED_TO)) {
if (event->mask & IN_ISDIR) {
// Perform a recursive scan in case there are directories
// there already.
addWatches(scanDirs(QDir(filePath)));
}
emit pathAdded(filePath);
}
if (event->mask & IN_CLOSE_WRITE) {
emit pathChanged(filePath);
}
if (event->mask & (IN_MOVED_FROM|IN_DELETE)) {
if (event->mask & IN_ISDIR) {
removeWatch(filePath);
}
emit pathRemoved(filePath);
}
pos += struct_size + event->len;
}
} while (nread > 0);
}
QStringList Watcher::scanDirs(const QDir &dir)
{
Q_ASSERT(dir.isReadable());
QStringList l(dir.absolutePath()); // Add dir to the list
QStringList sub_dirs = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
foreach (const QString& s, sub_dirs) {
const QString abs_path = dir.absoluteFilePath(s);
l << scanDirs(QDir(abs_path));
}
return l;
}
void Watcher::addWatches(const QStringList &paths)
{
foreach (const QString& s, paths) {
addWatch(s);
}
}
void Watcher::addWatch(const QString& path)
{
int wd = inotify_add_watch(_fd, path.toLocal8Bit().constData(), _mask);
if (wd == -1) {
qWarning() << "Failed to add watch for" << path;
return;
}
if (_watches.contains(wd)) {
qWarning() << "Watch for" << path << "was already setup";
return;
}
qDebug() << "Watching" << path;
_watches[wd] = path;
_dirs[path] = wd;
}
void Watcher::removeWatch(const QString& path)
{
if (!_dirs.contains(path)) {
qWarning() << "Watch for" << path << "not found";
return;
}
int wd = _dirs[path];
removeWatch(wd);
}
void Watcher::removeWatch(int wd)
{
if (!_watches.contains(wd)) {
qWarning() << "Watch" << wd << "not found";
}
QString path = _watches[wd];
qDebug() << "Unwatching" << path;
inotify_rm_watch(_fd, wd);
_dirs.remove(path);
_watches.remove(wd);
}
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