Cross platform library for file change notification. https://github.com/haskell-fswatch/hfsnotify

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LTS Haskell 11.0:
Stackage Nightly 2018-03-12:
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BSD3 licensed by Mark Dittmer
Maintained by Greg Weber, Roman Cheplyaka

Module documentation for


Unified Haskell interface for basic file system notifications.

This is a library. There are executables built on top of it.



compile with -fthreaded




Catch IO exceptions when initialising inotify on Linux

Version 0.2.1

Don't use system-filepath

Version 0.2

Use filepath instead of deprecated system-filepath


  • Fix the tests


  • Restore compatibility with GHC 7.4
  • Fix a bug in treeExtAny, which previously work identically to treeExtExists
  • Improve documentation


Include CHANGELOG.md and README.md in the source distribution.

Version 0.1

  • Allow to stop a listening job. Note this changes the return type of watching functions from () to IO ().
  • Previously, some care was taken to prevent multiple callbacks from running simultaneously. It is now the user's responsibility. See #43 for details.
  • Previously, paths returned to callbacks were relative on Windows. Now they are absolute, like on the other platforms.
  • The WatchConfig type has changed. Previously, it only specified debouncing parameters. Now it also contains polling parameters.
  • The isPollingManager function is added to determine, at runtime, whether the polling implementation is used.
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