linux-inotify alternatives and similar packages
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This is a binding for GHC 7 to the Linux Kernel's inotify interface, which provides notifications to applications regarding file system events, such as file creation, modification, deletion, etc.
In contrast to
hinotify, which provides similar functionality,
linux-inotify is a much thinner binding to the system calls and
message format. Some of the advantages are:
linux-inotifyprovides a plain
getEventoperator that blocks, instead of implementing a callback API.
linux-inotifyavoids most of GHC's standard IO handling code, relying on plain system calls with minimal overhead in Haskell-land. (However, it still does make good use of GHC's IO manager via nonblocking inotify sockets and
getEventis still efficient.)
linux-inotifydoes not call
forkIO, which means less context switching and scheduling overhead, especially in contexts where
hinotify's particular event router isn't a very good fit for your application; e.g. you are implementing a following log file processor.
Some of the downsides are:
Due to the use of
linux-inotifycurrently requires linux 2.6.27 or later, even though
inotifysupport debuted in linux 2.6.13. You can check which version of linux is on a machine via
uname -a. I would like to fix this at some point, but it isn't a personal priority.
linux-inotifyrequires GHC 7.0.2 or later, whereas
hinotifyworks with many versions of GHC 6. I have no plans to fix this.
linux-inotifyis currently just a quick proof of concept. Documentation is missing. The API is still in flux and needs expanding. I've only performed the most preliminary of smoke tests, and I haven't done any performance testing.