Musl

Short description: Implementation of C standard library for Linux operating system

musl

Developer(s)| Rich Felker (dalias) and others
Initial release| February 11, 2011; 13 years ago (2011-02-11)[1]
Stable release|

1.2.4[2] / May 1, 2023; 9 months ago (2023-05-01)

Operating system| Linux 2.6 or later
Platform| x86, x86 64, ARM, MIPS, Microblaze, PowerPC, powerpc64, x32, riscv64, OpenRISC, s390x, SuperH
Type|

* C standard library
* Linux for embedded systems
* Linux for mobile devices

License| MIT License
Website| musl.libc.org

musl is a C standard library intended for operating systems based on the Linux kernel, released under the MIT License.[3] It was developed by Rich Felker with the goal to write a clean, efficient, and standards-conformant libc implementation.[4]

## Contents

* 1 Overview
* 2 Use
* 3 See also
* 4 References
* 5 External links

## Overview

musl was designed from scratch to allow efficient static linking and to have realtime-quality robustness by avoiding race conditions, internal failures on resource exhaustion and various other bad worst-case behaviors present in existing implementations.[4] The dynamic runtime is a single file with stable ABI allowing race-free updates and the static linking support allows an application to be deployed as a single portable binary without significant size overhead.

It claims compatibility with the POSIX 2008 specification and the C11 standard. It also implements most of the widely used non-standard Linux, BSD, and glibc functions.[5] There is partial ABI compatibility with the part of glibc required by Linux Standard Base.[6]

Version 1.2.0 has support for (no longer current) Unicode 12.1.0 (while still having full UTF-8 support,[7] more conformant/strict than glibc), and version 1.2.1 "features the new 'mallocng' malloc implementation, replacing musl's original dlmalloc-like allocator that suffered from fundamental design problems."[2]

## Use

Some Linux distributions that can use musl as the standard C library include Alpine Linux,[8] Dragora 3,[9] Gentoo Linux,[10] OpenWrt,[11] Sabotage,[12] Morpheus Linux,[13] Chimera Linux,[14] and Void Linux.[15] The seL4 microkernel[16] ships with musl. For binaries that have been linked against glibc, gcompat[17] can be used to execute them on musl-based distros.

## See also

* Bionic libc
* dietlibc
* EGLIBC
* glibc
* klibc
* Newlib
* uClibc

## References

1. ↑ "musl - obsolete versions". 2017-10-31. https://www.musl-libc.org/oldversions.html. >
2. ↑ 2.0 2.1 "musl libc Release History". https://musl.libc.org/releases.html.
3. ↑ Rich Felker (2016-04-29). "COPYRIGHT". https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT.
4. ↑ 4.0 4.1 "Introduction to musl". 2016-04-21. https://www.musl-libc.org/intro.html.
5. ↑ "Compatibility". 2014-05-27. http://wiki.musl-libc.org/wiki/Compatibility.
6. ↑ "Comparison of C/POSIX standard library implementations for Linux". http://www.etalabs.net/compare_libcs.html.
7. ↑ "musl libc - Functional differences from glibc". https://wiki.musl-libc.org/functional-differences-from-glibc.html.
8. ↑ "About". https://alpinelinux.org/about/.
9. ↑ Larabel, Michael (30 September 2018). "Dragora 3.0 Alpha 2 Released As One Of The Libre GNU/Linux Platforms". Phoronix Media. https://www.phoronix.com/scan.php?page=news_item&px=Dragora-3.0-Alpha-2.
10. ↑ "Additional stage downloads for amd64, ppc, x86, arm available". 20 July 2021. https://www.gentoo.org/news/2021/07/20/more-downloads.html.
11. ↑ Fietkau, Felix (16 Jun 2015). "OpenWrt switches to musl by default". http://permalink.gmane.org/gmane.comp.embedded.openwrt.devel/32651.
12. ↑ on GitHub
13. ↑ "morpheus". https://morpheus.2f30.org/.
14. ↑ "Chimera Linux - About" (in en). https://chimera-linux.org/about/#alternative-userland.
15. ↑ "Enter the void". https://voidlinux.org/.
16. ↑ seL4/musllibc, seL4 microkernel and related repositories, 2020-08-30, https://github.com/seL4/musllibc, retrieved 2020-09-05
17. ↑ "Adélie Linux / gcompat" (in en). https://code.foxkit.us/adelie/gcompat.

## External links

* Comparison of C/POSIX standard library implementations for Linux
* Matrix of C/POSIX standard libraries by architecture
* Project:Musl on Gentoo wiki
* Rich Felker held a talk at the Embedded Linux Conference (ELC) 2015: ELC 2015 - Transitioning From uclibc to musl for Embedded Development - Rich Felker, Openwall

* v
* t
* e

C programming language

* ANSI C
* C89 and C90
* C99
* C11
* C18
* C2x
* Embedded C
* MISRA C

Features|

* Functions
* Header files
* Libraries
* Operators
* String
* Syntax
* Preprocessor
* Data types

Standard library
functions|

* Char (ctype.h)
* File I/O (stdio.h)
* Math (math.h)
* Dynamic memory (stdlib.h)
* String (string.h)
* Time (time.h)
* Variadic (stdarg.h)
* POSIX

Standard
libraries|

* Bionic
* libhybris
* dietlibc
* EGLIBC
* glibc
* klibc
* Microsoft Run-time Library
* musl
* Newlib
* uClibc
* BSD libc

Compilers|

* Comparison of compilers
* ACK
* Borland Turbo C
* Clang
* GCC
* ICC
* LCC
* PCC
* SDCC
* TCC
* Microsoft Visual Studio / Express / C++
* Watcom C/C++

IDEs|

* Comparison of IDEs
* Anjuta
* Code
* CodeLite
* Eclipse
* Geany
* Microsoft Visual Studio
* NetBeans

Comparison with
other languages|

* Compatibility of C and C++
* Comparison with Embedded C
* Comparison with Pascal
* Comparison of programming languages

Descendant
languages|

* C++
* C#
* D
* Objective-C
* Alef
* Limbo
* Go
* Vala

* Category

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