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musl - an implementation of the standard library for Linux-based systems
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Rich Felker 28f64fa6ca switch to a common calloc implementation 
abstractly, calloc is completely malloc-implementation-independent;
it's malloc followed by memset, or as we do it, a "conditional memset"
that avoids touching fresh zero pages.

previously, calloc was kept separate for the bump allocator, which can
always skip memset, and the version of calloc provided with the full
malloc conditionally skipped the clearing for large direct-mmapped
allocations. the latter is a moderately attractive optimization, and
can be added back if needed. however, further consideration to make it
correct under malloc replacement would be needed.

commit b4b1e10364 documented the
contract for malloc replacement as allowing omission of calloc, and
indeed that worked for dynamic linking, but for static linking it was
possible to get the non-clearing definition from the bump allocator;
if not for that, it would have been a link error trying to pull in
malloc.o.

the conditional-clearing code for the new common calloc is taken from
mal0_clear in oldmalloc, but drops the need to access actual page size
and just uses a fixed value of 4096. this avoids potentially needing
access to global data for the sake of an optimization that at best
marginally helps archs with offensively-large page sizes.
2020-06-10 20:34:34 -04:00
arch fix incorrect SIGSTKFLT on all mips archs 2020-05-21 16:25:12 -04:00
compat/time32 fix null pointer dereference in setitimer time32 compat shim 2019-12-08 10:35:04 -05:00
crt remove unnecessary and problematic _Noreturn from crt/ldso startup 2019-06-25 19:05:40 -04:00
dist add another example option to dist/config.mak 2012-04-24 16:49:11 -04:00
include remove duplicate definitions of INET[6]_ADDRSTRLEN 2020-03-04 12:33:35 -05:00
ldso move declaration of interfaces between malloc and ldso to dynlink.h 2020-06-02 21:38:25 -04:00
src switch to a common calloc implementation 2020-06-10 20:34:34 -04:00
tools fix incorrect escaping in add-cfi.*.awk scripts 2020-01-20 15:57:29 -05:00
.gitignore remove obsolete gitignore rules 2016-07-06 00:21:25 -04:00
.mailmap update contributor name 2019-12-07 12:21:35 -05:00
configure suppress unwanted warnings when configuring with clang 2020-06-01 20:59:53 -04:00
COPYRIGHT update COPYRIGHT year 2020-01-01 11:17:20 -05:00
dynamic.list fix regression in access to optopt object 2018-11-19 13:20:41 -05:00
INSTALL document mips r6 in INSTALL file 2019-09-27 00:22:48 -04:00
Makefile move oldmalloc to its own directory under src/malloc 2020-06-03 19:23:02 -04:00
README update version reference in the README file 2014-06-25 14:16:53 -04:00
VERSION release 1.2.0 2020-02-20 19:37:02 -05:00
WHATSNEW release 1.2.0 2020-02-20 19:37:02 -05:00

README 

    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/