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/*
* Copyright (C) by Duncan Mac-Vicar P. <duncan@kde.org>
*
* Originally based on example copyright (c) Ashish Shukla
* Ported to use QSocketNotifier later instead of a thread loop
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "config.h"
#include <sys/inotify.h>
#include "inotify.h"
#include "mirall/folder.h"
#include <cerrno>
#include <unistd.h>
#include <QDebug>
#include <QStringList>
#include <QSocketNotifier>
#include "inotify.h"
// Buffer Size for read() buffer
#define DEFAULT_READ_BUFFERSIZE 2048
namespace Mirall {
INotify::INotify(QObject *parent, int mask)
: QObject(parent),
_mask(mask)
{
_fd = inotify_init();
if (_fd == -1)
qDebug() << Q_FUNC_INFO << "notify_init() failed: " << strerror(errno);
_notifier = new QSocketNotifier(_fd, QSocketNotifier::Read);
connect(_notifier, SIGNAL(activated(int)), SLOT(slotActivated(int)));
_buffer_size = DEFAULT_READ_BUFFERSIZE;
_buffer = (char *) malloc(_buffer_size);
}
void INotify::slotActivated(int /*fd*/)
{
int len;
struct inotify_event* event;
int i;
int error;
do {
len = read(_fd, _buffer, _buffer_size);
error = errno;
/**
* From inotify documentation:
*
* The behavior when the buffer given to read(2) is too
* small to return information about the next event
* depends on the kernel version: in kernels before 2.6.21,
* read(2) returns 0; since kernel 2.6.21, read(2) fails with
* the error EINVAL.
*/
if (len < 0 && error == EINVAL)
{
// double the buffer size
qWarning() << "buffer size too small";
_buffer_size *= 2;
_buffer = (char *) realloc(_buffer, _buffer_size);
/* and try again ... */
continue;
}
} while (false);
/* TODO handle len == 0 */
// reset counter
i = 0;
// while there are enough events in the buffer
while(i + sizeof(struct inotify_event) < static_cast<unsigned int>(len)) {
// cast an inotify_event
event = (struct inotify_event*)&_buffer[i];
// with the help of watch descriptor, retrieve, corresponding INotify
if (event == NULL) {
qDebug() << "NULL event";
continue;
}
// fire event
if (event->len > 0) {
QStringList paths(_wds.keys(event->wd));
foreach (QString path, paths)
emit notifyEvent(event->mask, event->cookie, path + "/" + QString::fromUtf8(event->name));
}
// increment counter
i += sizeof(struct inotify_event) + event->len;
}
}
INotify::~INotify()
{
// Remove all inotify watchs.
QString key;
foreach (key, _wds.keys())
inotify_rm_watch(_fd, _wds.value(key));
close(_fd);
free(_buffer);
delete _notifier;
}
void INotify::addPath(const QString &path)
{
// Add an inotify watch.
int wd = inotify_add_watch(_fd, path.toUtf8().constData(), _mask);
if( wd > -1 )
_wds[path] = wd;
else
qDebug() << "WRN: Could not watch " << path << ':' << strerror(errno);
}
void INotify::removePath(const QString &path)
{
// Remove the inotify watch.
inotify_rm_watch(_fd, _wds[path]);
_wds.remove(path);
}
QStringList INotify::directories() const
{
return _wds.keys();
}
} // ns mirall
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