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Event notification library

The libevent API executes a callback function when a specific event occurs on a file descriptor or after a timeout has been reached. It also supports callbacks due to signals or regular timeouts. It is meant to replace the asynchronous event loop found in event-driven network servers. 'libevent' currently supports /dev/poll, kqueue(2), select(2), poll(2) and epoll(4). It also has experimental support for real-time signals. The internal event mechanism is independent of the exposed event API, so a simple update of libevent provides new functionality without having to redesign applications. As a result, Libevent allows for portable application development and provides the most scalable event notification mechanism available on an operating system.


Download version 2.1.8 (stable)
released on 22 January 2017


Related Projects


LicenseVerified byVerified onNotes
License:BSD 3ClauseJanet Casey8 October 2004

Leaders and contributors

Niels Provos Maintainer

Resources and communication

AudienceResource typeURI
Bug Tracking,Developer,

Software prerequisites

This entry (in part or in whole) was last reviewed on 16 February 2017.


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