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This patch modifies InodeWatcher to switch to a one watcher, multiple
watches architecture. The following changes have been made:
- The watch_file syscall is removed, and in its place the
create_iwatcher, iwatcher_add_watch and iwatcher_remove_watch calls
have been added.
- InodeWatcher now holds multiple WatchDescriptions for each file that
is being watched.
- The InodeWatcher file descriptor can be read from to receive events on
all watched files.
Co-authored-by: Gunnar Beutner <gunnar@beutner.name>
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