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92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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 <AK/Memory.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/InodeWatcher.h>
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namespace Kernel {
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NonnullRefPtr<InodeWatcher> InodeWatcher::create(Inode& inode)
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{
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return adopt(*new InodeWatcher(inode));
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}
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InodeWatcher::InodeWatcher(Inode& inode)
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: m_inode(inode.make_weak_ptr())
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{
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inode.register_watcher({}, *this);
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}
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InodeWatcher::~InodeWatcher()
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{
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if (RefPtr<Inode> safe_inode = m_inode.ptr())
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safe_inode->unregister_watcher({}, *this);
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}
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bool InodeWatcher::can_read(const FileDescription&, size_t) const
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{
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return !m_queue.is_empty() || !m_inode;
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}
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bool InodeWatcher::can_write(const FileDescription&, size_t) const
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{
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return true;
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}
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ssize_t InodeWatcher::read(FileDescription&, size_t, u8* buffer, ssize_t buffer_size)
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{
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ASSERT(!m_queue.is_empty() || !m_inode);
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if (!m_inode)
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return 0;
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// FIXME: What should we do if the output buffer is too small?
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ASSERT(buffer_size >= (int)sizeof(Event));
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auto event = m_queue.dequeue();
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memcpy(buffer, &event, sizeof(event));
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return sizeof(event);
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}
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ssize_t InodeWatcher::write(FileDescription&, size_t, const u8*, ssize_t)
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{
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return -EIO;
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}
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String InodeWatcher::absolute_path(const FileDescription&) const
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{
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if (!m_inode)
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return "InodeWatcher:(gone)";
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return String::format("InodeWatcher:%s", m_inode->identifier().to_string().characters());
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}
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void InodeWatcher::notify_inode_event(Badge<Inode>, Event::Type event_type)
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{
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m_queue.enqueue({ event_type });
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}
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}
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