[
    {
        "Name"                  : "musl",
        "License"               : "MIT License",
        "License File"          : "COPYRIGHT",
        "Version Number"        : "1.2.3",
        "Owner"                 : "jianghan2@huawei.com",
        "Upstream URL"          : "https://musl.libc.org",
        "Description"           : "musl is an MIT-licensed implementation of the standard C library"
    },
    {
        "Name"                  : "OpenBSD",
        "License"               : "BSD License",
        "License File"          : "LICENSE",
        "Version Number"        : "7.4",
        "Owner"                 : "fangting12@huawei.com",
        "Upstream URL"          : "https://cvsweb.openbsd.org/src/lib/libc/string/",
        "Description"           : "The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. We introduce some basic interface files to improve the interface performance of Musl"
    },
    {
        "Name"                  : "NetBSD",
        "License"               : "BSD License",
        "License File"          : "LICEMSE",
        "Version Number"        : "9.0",
        "Owner"                 : "fangting12@huawei.com",
        "Upstream URL"          : "https://github.com/NetBSD/src/tree/netbsd-9",
        "Description"           : "NetBSD is a free, fast, secure, and highly portable Unix-like Open Source operating system. We introduce some basic interface files to improve the interface performance of Musl"
    }
]

# musl libc

musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.

The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.

For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:http://www.musl-libc.org/

# Musl libc

musl，是MIT授权的针对Linux系统调用的API的标准C库实现，适用于广泛的部署环境。musl提供了高效的静态和动态链接支持， 为轻量级代码并且运行时开销低，在正确使用时具有强大的故障安全保证，以及标准一致性意义上的正确性和安全性。musl建立的原则是使用便于理解和维护的简单代码来实现目标。

musl的1.1版本系列涵盖了所有在ISO C99和POSIX 2008基础中定义的接口，以及一些非标准的为了与Linux、BSD和glibc功能兼容的接口。

## 目录结构

```
README_zh.md            #中文说明
include					#musl头文件
ldso					#动态链接器
libc-test				#关于musl的测试用例
ndk_musl_include		#生成ndk版本的头文件
ndk_script				#生成ndk版本的脚本
porting                 #linux liteos平台对musl适配文件
src						#musl文件源
scripts					#测试用脚本
```

## Openharmony对于musl的适配

musl编译框架时编译，使用BUILD.gn进行配置编译。

基于openharmony的需求，为musl新增的特性：

-  加载器地址随机化，RELRO共享机制
-  提供加载器namespace机制
-  OHOS容器中能够运行依赖bionic的库
-  musl全球化接口适配locale数据能力
-  mallocng堆内存分配器安全增强，默认开启meta指针混淆。地址随机化通过MALLOC_SECURE_ALL宏开关。可在编译命令中增加--gn-args="musl_secure_level=3"开启

等。在新增特性基础上，也进行了对于musl接口功能的完善与错误的修复。

## Musl使用文档

有关完整musl目标编译器工具链、系统的信息bootstrapping和基于musl构建的Linux发行版可以在官方网站上找到：http://www.musl-libc.org/

有关基本安装说明，请参阅附带的[INSTALL](https://gitee.com/openharmony/third_party_musl/blob/master/INSTALL)文件。

musl参考手册：https://musl.libc.org/doc/1.1.24/manual.html