mirror of
https://github.com/fluencelabs/musl
synced 2025-07-31 22:31:58 +00:00
c7f56b4d2f
It is possible for argv[0] to be a null pointer, but the __progname variable is used to implement functions in src/legacy/err.c that do not expect it to be null. It is also available to the user via the program_invocation_name alias as a GNU extension, and the implementation in Glibc initializes it to a pointer to empty string rather than NULL. Since argv[0] is usually non-null and it's preferable to keep those variables in BSS, implement the fallbacks in __init_libc, which also allows to have an intermediate fallback to AT_EXECFN.
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/