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musl - an implementation of the standard library for Linux-based systems
503bd39766
the files added come from the mallocng development repo, commit 2ed58817cca5bc055974e5a0e43c280d106e696b. they comprise a new malloc implementation, developed over the past 9 months, to replace the old allocator (since dubbed "oldmalloc") with one that retains low code size and minimal baseline memory overhead while avoiding fundamental flaws in oldmalloc and making significant enhancements. these include highly controlled fragmentation, fine-grained ability to return memory to the system when freed, and strong hardening against dynamic memory usage errors by the caller. internally, mallocng derives most of these properties from tightly structuring memory, creating space for allocations as uniform-sized slots within individually mmapped (and individually freeable) allocation groups. smaller-than-pagesize groups are created within slots of larger ones. minimal group size is very small, and larger sizes (in geometric progression) only come into play when usage is high. all data necessary for maintaining consistency of the allocator state is tracked in out-of-band metadata, reachable via a validated path from minimal in-band metadata. all pointers passed (to free, etc.) are validated before any stores to memory take place. early reuse of freed slots is avoided via approximate LRU order of freed slots. further hardening against use-after-free and double-free, even in the case where the freed slot has been reused, is made by cycling the offset within the slot at which the allocation is placed; this is possible whenever the slot size is larger than the requested allocation. |
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| arch | ||
| compat/time32 | ||
| crt | ||
| dist | ||
| include | ||
| ldso | ||
| src | ||
| tools | ||
| .gitignore | ||
| .mailmap | ||
| 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/