mirror of
git://git.musl-libc.org/musl
synced 2024-12-16 03:35:06 +00:00
musl - an implementation of the standard library for Linux-based systems
722a1ae335
major changes are made alongside adding time64 syscall support to account for issues found during research. select historically accepts non-normalized (tv_usec not restricted to less than 1000000) timeouts, and the kernel normalizes them, but the normalization code is buggy and subject to integer overflows. since normalization is needed anyway when using SYS_pselect6 or SYS_pselect6_time64 as the backend, simply do it up-front to eliminate both code path complexity and the possibility of kernel bugs. as a side effect, select no longer updates the caller's timeout timeval with the remaining time. previously, archs that used SYS_select updated it and archs that used SYS_pselect6 didn't. this change may turn out to be controversial and may need revisiting, but in any case the old behavior was not strictly conforming. POSIX allows modification of the timeout "upon successful completion", but the Linux syscall modifies it upon unsuccessful completion (EINTR) as well (and presumably each time the syscall stops and restarts before it's known whether completion will be successful). it's possible that this language does not reflect the actual intent of the standard, since other historical implementations probably behaved like Linux, but that should be clarified if there's a desire to bring the old behavior back. regardless, programs that are depending on this are not correct and are already broken on some archs we support. |
||
|---|---|---|
| arch | ||
| crt | ||
| dist | ||
| include | ||
| ldso | ||
| src | ||
| tools | ||
| .gitignore | ||
| configure | ||
| COPYRIGHT | ||
| dynamic.list | ||
| INSTALL | ||
| Makefile | ||
| README | ||
| VERSION | ||
| WHATSNEW | ||
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/