mirror of
https://github.com/nextcloud/desktop.git
synced 2024-12-18 11:51:51 +03:00
145 lines
3.9 KiB
C++
145 lines
3.9 KiB
C++
/*
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* Copyright (C) by Duncan Mac-Vicar P. <duncan@kde.org>
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*
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* Originally based on example copyright (c) Ashish Shukla
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* Ported to use QSocketNotifier later instead of a thread loop
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "config.h"
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#include <sys/inotify.h>
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#include "inotify.h"
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#include "mirall/folder.h"
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#include <cerrno>
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#include <unistd.h>
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#include <QDebug>
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#include <QStringList>
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#include <QSocketNotifier>
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#include "inotify.h"
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// Buffer Size for read() buffer
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#define DEFAULT_READ_BUFFERSIZE 2048
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namespace Mirall {
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INotify::INotify(QObject *parent, int mask)
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: QObject(parent),
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_mask(mask)
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{
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_fd = inotify_init();
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if (_fd == -1)
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qDebug() << Q_FUNC_INFO << "notify_init() failed: " << strerror(errno);
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_notifier = new QSocketNotifier(_fd, QSocketNotifier::Read);
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connect(_notifier, SIGNAL(activated(int)), SLOT(slotActivated(int)));
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_buffer_size = DEFAULT_READ_BUFFERSIZE;
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_buffer = (char *) malloc(_buffer_size);
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}
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void INotify::slotActivated(int /*fd*/)
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{
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int len;
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struct inotify_event* event;
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int i;
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int error;
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do {
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len = read(_fd, _buffer, _buffer_size);
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error = errno;
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/**
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* From inotify documentation:
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*
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* The behavior when the buffer given to read(2) is too
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* small to return information about the next event
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* depends on the kernel version: in kernels before 2.6.21,
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* read(2) returns 0; since kernel 2.6.21, read(2) fails with
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* the error EINVAL.
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*/
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if (len < 0 && error == EINVAL)
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{
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// double the buffer size
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qWarning() << "buffer size too small";
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_buffer_size *= 2;
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_buffer = (char *) realloc(_buffer, _buffer_size);
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/* and try again ... */
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continue;
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}
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} while (false);
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/* TODO handle len == 0 */
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// reset counter
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i = 0;
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// while there are enough events in the buffer
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while(i + sizeof(struct inotify_event) < static_cast<unsigned int>(len)) {
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// cast an inotify_event
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event = (struct inotify_event*)&_buffer[i];
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// with the help of watch descriptor, retrieve, corresponding INotify
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if (event == NULL) {
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qDebug() << "NULL event";
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i += sizeof(struct inotify_event);
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continue;
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}
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// fire event
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if (event->len > 0) {
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QStringList paths(_wds.keys(event->wd));
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foreach (QString path, paths)
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emit notifyEvent(event->mask, event->cookie, path + "/" + QString::fromUtf8(event->name));
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}
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// increment counter
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i += sizeof(struct inotify_event) + event->len;
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}
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}
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INotify::~INotify()
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{
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// Remove all inotify watchs.
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QString key;
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foreach (key, _wds.keys())
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inotify_rm_watch(_fd, _wds.value(key));
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close(_fd);
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free(_buffer);
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delete _notifier;
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}
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bool INotify::addPath(const QString &path)
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{
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// Add an inotify watch.
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int wd = inotify_add_watch(_fd, path.toUtf8().constData(), _mask);
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if( wd > -1 ) {
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_wds[path] = wd;
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return true;
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} else {
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qDebug() << "WRN: Could not watch " << path << ':' << strerror(errno);
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return false;
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}
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}
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void INotify::removePath(const QString &path)
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{
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// Remove the inotify watch.
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inotify_rm_watch(_fd, _wds[path]);
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_wds.remove(path);
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}
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QStringList INotify::directories() const
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{
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return _wds.keys();
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}
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} // ns mirall
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