mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <AK/Memory.h>
|
|
#include <Kernel/FileSystem/Inode.h>
|
|
#include <Kernel/FileSystem/InodeWatcher.h>
|
|
|
|
namespace Kernel {
|
|
|
|
NonnullRefPtr<InodeWatcher> InodeWatcher::create(Inode& inode)
|
|
{
|
|
return adopt(*new InodeWatcher(inode));
|
|
}
|
|
|
|
InodeWatcher::InodeWatcher(Inode& inode)
|
|
: m_inode(inode)
|
|
{
|
|
inode.register_watcher({}, *this);
|
|
}
|
|
|
|
InodeWatcher::~InodeWatcher()
|
|
{
|
|
if (auto inode = m_inode.strong_ref())
|
|
inode->unregister_watcher({}, *this);
|
|
}
|
|
|
|
bool InodeWatcher::can_read(const FileDescription&, size_t) const
|
|
{
|
|
return !m_queue.is_empty() || !m_inode;
|
|
}
|
|
|
|
bool InodeWatcher::can_write(const FileDescription&, size_t) const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
KResultOr<size_t> InodeWatcher::read(FileDescription&, size_t, UserOrKernelBuffer& buffer, size_t buffer_size)
|
|
{
|
|
LOCKER(m_lock);
|
|
ASSERT(!m_queue.is_empty() || !m_inode);
|
|
|
|
if (!m_inode)
|
|
return 0;
|
|
|
|
auto event = m_queue.dequeue();
|
|
|
|
if (buffer_size < sizeof(InodeWatcherEvent))
|
|
return buffer_size;
|
|
|
|
size_t bytes_to_write = min(buffer_size, sizeof(event));
|
|
|
|
ssize_t nwritten = buffer.write_buffered<sizeof(event)>(bytes_to_write, [&](u8* data, size_t data_bytes) {
|
|
memcpy(data, &event, bytes_to_write);
|
|
return (ssize_t)data_bytes;
|
|
});
|
|
if (nwritten < 0)
|
|
return KResult((ErrnoCode)-nwritten);
|
|
evaluate_block_conditions();
|
|
return bytes_to_write;
|
|
}
|
|
|
|
KResultOr<size_t> InodeWatcher::write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t)
|
|
{
|
|
return EIO;
|
|
}
|
|
|
|
String InodeWatcher::absolute_path(const FileDescription&) const
|
|
{
|
|
if (auto inode = m_inode.strong_ref())
|
|
return String::formatted("InodeWatcher:{}", inode->identifier().to_string());
|
|
return "InodeWatcher:(gone)";
|
|
}
|
|
|
|
void InodeWatcher::notify_inode_event(Badge<Inode>, InodeWatcherEvent::Type event_type)
|
|
{
|
|
LOCKER(m_lock);
|
|
m_queue.enqueue({ event_type });
|
|
evaluate_block_conditions();
|
|
}
|
|
|
|
void InodeWatcher::notify_child_added(Badge<Inode>, const InodeIdentifier& child_id)
|
|
{
|
|
LOCKER(m_lock);
|
|
m_queue.enqueue({ InodeWatcherEvent::Type::ChildAdded, child_id.index().value() });
|
|
evaluate_block_conditions();
|
|
}
|
|
|
|
void InodeWatcher::notify_child_removed(Badge<Inode>, const InodeIdentifier& child_id)
|
|
{
|
|
LOCKER(m_lock);
|
|
m_queue.enqueue({ InodeWatcherEvent::Type::ChildRemoved, child_id.index().value() });
|
|
evaluate_block_conditions();
|
|
}
|
|
|
|
}
|