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0b0c09e647
DirectoryWatcher is a wrapper around watch_file, and can be used to watch for changes in directories.
98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "DirectoryWatcher.h"
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#include <AK/LexicalPath.h>
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#include <AK/Optional.h>
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#include <LibCore/DirIterator.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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namespace Core {
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// Only supported in serenity mode because we use `watch_file`
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#ifdef __serenity__
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DirectoryWatcher::DirectoryWatcher(const String& path)
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: m_path(path)
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{
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m_watcher_fd = watch_file(path.characters(), path.length());
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ASSERT(m_watcher_fd != -1);
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}
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DirectoryWatcher::~DirectoryWatcher()
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{
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close(m_watcher_fd);
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}
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Optional<DirectoryWatcher::Event> DirectoryWatcher::wait_for_event()
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{
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InodeWatcherEvent event {};
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int rc = read(m_watcher_fd, &event, sizeof(event));
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if (rc <= 0)
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return {};
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Event result;
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if (event.type == InodeWatcherEvent::Type::ChildAdded)
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result.type = Event::Type::ChildAdded;
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else if (event.type == InodeWatcherEvent::Type::ChildRemoved)
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result.type = Event::Type::ChildRemoved;
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else
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return {};
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auto child_path = get_child_with_inode_index(event.inode_index);
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if (!LexicalPath(child_path).is_valid())
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return {};
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result.child_path = child_path;
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return result;
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}
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String DirectoryWatcher::get_child_with_inode_index(unsigned child_inode_index) const
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{
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DirIterator iterator(m_path, Core::DirIterator::SkipDots);
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if (iterator.has_error()) {
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return {};
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}
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while (iterator.has_next()) {
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auto child_full_path = String::formatted("{}/{}", m_path, iterator.next_path());
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struct stat st;
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if (lstat(child_full_path.characters(), &st)) {
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return {};
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}
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if (st.st_ino == child_inode_index) {
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return child_full_path;
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}
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}
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return {};
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}
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#endif
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}
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