forked from cerc-io/ipld-eth-server
80 lines
4.1 KiB
Markdown
80 lines
4.1 KiB
Markdown
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# File system notifications for Go
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[](https://godoc.org/github.com/fsnotify/fsnotify) [](https://goreportcard.com/report/github.com/fsnotify/fsnotify)
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fsnotify utilizes [golang.org/x/sys](https://godoc.org/golang.org/x/sys) rather than `syscall` from the standard library. Ensure you have the latest version installed by running:
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```console
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go get -u golang.org/x/sys/...
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```
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Cross platform: Windows, Linux, BSD and macOS.
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|Adapter |OS |Status |
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|----------|----------|----------|
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|inotify |Linux 2.6.27 or later, Android\*|Supported [](https://travis-ci.org/fsnotify/fsnotify)|
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|kqueue |BSD, macOS, iOS\*|Supported [](https://travis-ci.org/fsnotify/fsnotify)|
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|ReadDirectoryChangesW|Windows|Supported [](https://ci.appveyor.com/project/NathanYoungman/fsnotify/branch/master)|
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|FSEvents |macOS |[Planned](https://github.com/fsnotify/fsnotify/issues/11)|
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|FEN |Solaris 11 |[In Progress](https://github.com/fsnotify/fsnotify/issues/12)|
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|fanotify |Linux 2.6.37+ | |
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|USN Journals |Windows |[Maybe](https://github.com/fsnotify/fsnotify/issues/53)|
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|Polling |*All* |[Maybe](https://github.com/fsnotify/fsnotify/issues/9)|
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\* Android and iOS are untested.
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Please see [the documentation](https://godoc.org/github.com/fsnotify/fsnotify) and consult the [FAQ](#faq) for usage information.
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## API stability
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fsnotify is a fork of [howeyc/fsnotify](https://godoc.org/github.com/howeyc/fsnotify) with a new API as of v1.0. The API is based on [this design document](http://goo.gl/MrYxyA).
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All [releases](https://github.com/fsnotify/fsnotify/releases) are tagged based on [Semantic Versioning](http://semver.org/). Further API changes are [planned](https://github.com/fsnotify/fsnotify/milestones), and will be tagged with a new major revision number.
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Go 1.6 supports dependencies located in the `vendor/` folder. Unless you are creating a library, it is recommended that you copy fsnotify into `vendor/github.com/fsnotify/fsnotify` within your project, and likewise for `golang.org/x/sys`.
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## Contributing
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Please refer to [CONTRIBUTING][] before opening an issue or pull request.
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## Example
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See [example_test.go](https://github.com/fsnotify/fsnotify/blob/master/example_test.go).
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## FAQ
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**When a file is moved to another directory is it still being watched?**
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No (it shouldn't be, unless you are watching where it was moved to).
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**When I watch a directory, are all subdirectories watched as well?**
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No, you must add watches for any directory you want to watch (a recursive watcher is on the roadmap [#18][]).
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**Do I have to watch the Error and Event channels in a separate goroutine?**
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As of now, yes. Looking into making this single-thread friendly (see [howeyc #7][#7])
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**Why am I receiving multiple events for the same file on OS X?**
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Spotlight indexing on OS X can result in multiple events (see [howeyc #62][#62]). A temporary workaround is to add your folder(s) to the *Spotlight Privacy settings* until we have a native FSEvents implementation (see [#11][]).
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**How many files can be watched at once?**
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There are OS-specific limits as to how many watches can be created:
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* Linux: /proc/sys/fs/inotify/max_user_watches contains the limit, reaching this limit results in a "no space left on device" error.
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* BSD / OSX: sysctl variables "kern.maxfiles" and "kern.maxfilesperproc", reaching these limits results in a "too many open files" error.
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[#62]: https://github.com/howeyc/fsnotify/issues/62
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[#18]: https://github.com/fsnotify/fsnotify/issues/18
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[#11]: https://github.com/fsnotify/fsnotify/issues/11
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[#7]: https://github.com/howeyc/fsnotify/issues/7
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[contributing]: https://github.com/fsnotify/fsnotify/blob/master/CONTRIBUTING.md
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## Related Projects
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* [notify](https://github.com/rjeczalik/notify)
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* [fsevents](https://github.com/fsnotify/fsevents)
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