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GNU C Library
The GNU C Library (glibc) is the standard system C library for the GNU system. It provides the system API for all programs written in C and C-compatible languages. And the runtime facilities of other programming languages use the C library to access the underlying operating system.

In GNU/Linux distributions, the C library works with the Linux kernel to implement the operating system behavior seen by user applications. In GNU/Hurd, it works with a microkernel and Hurd servers.

The GNU C Library implements much of the POSIX.1 functionality in the GNU system, using configurations i[4567]86-*-gnu. The current GNU/Hurd support requires out-of-tree patches that will eventually be incorporated into an official GNU C Library release.

It is one of the most important components of the GNU operating system and its variants GNU/Linux. It is used by almost all C programs and provides the most essential program interface.


C Library reference manual available online from and in printed form from or 1-617-542-5942

Heckert gnu.small.png This is a GNU package:libc


Download version 2.22 (stable)
released on 5 August 2015

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Related Projects


LicenseVerified byVerified onNotes
LGPLKelly Hopkins21 May 2010

Leaders and contributors

C Library Steering Committee Maintainer
Andreas Schwab Contributor
Miles Bader Contributor
Thomas Bushnell Contributor

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Wiki Homepage
Bug Tracking VCS Repository Webview
Bug Tracking,Support E-mail
Developer E-mail
Help E-mail

Software prerequisites

This entry (in part or in whole) was last reviewed on 5 September 2015.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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