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c8e2bb5605
The syscall is quite simple:
int watch_file(const char* path, int path_length);
It returns a file descriptor referring to a "InodeWatcher" object in the
kernel. It becomes readable whenever something changes about the inode.
Currently this is implemented by hooking the "metadata dirty bit" in
Inode which isn't perfect, but it's a start. :^)
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/InodeWatcher.h>
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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(FileDescription&) 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(FileDescription&) const
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{
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return true;
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}
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ssize_t InodeWatcher::read(FileDescription&, 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&, 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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