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Rich Felker 384d103d94 fix failure to obtain EOWNERDEAD status for process-shared robust mutexes 
Linux's documentation (robust-futex-ABI.txt) claims that, when a
process dies with a futex on the robust list, bit 30 (0x40000000) is
set to indicate the status. however, what actually happens is that
bits 0-30 are replaced with the value 0x40000000, i.e. bits 0-29
(containing the old owner tid) are cleared at the same time bit 30 is
set.

our userspace-side code for robust mutexes was written based on that
documentation, assuming that kernel would never produce a futex value
of 0x40000000, since the low (owner) bits would always be non-zero.
commit d338b506e3 introduced this
assumption explicitly while fixing another bug in how non-recoverable
status for robust mutexes was tracked. presumably the tests conducted
at that time only checked non-process-shared robust mutexes, which are
handled in pthread_exit (which implemented the documented kernel
protocol, not the actual one) rather than by the kernel.

change pthread_exit robust list processing to match the kernel
behavior, clearing bits 0-29 while setting bit 30, and use the value
0x7fffffff instead of 0x40000000 to encode non-recoverable status. the
choice of value here is arbitrary; any value with at least one of bits
0-29 set should work just as well,
2016-06-27 15:18:13 -04:00
arch add preadv2 and pwritev2 syscall numbers for linux v4.6 2016-06-09 13:38:41 -04:00
crt add powerpc64 port 2016-05-08 22:57:40 -04:00
dist add another example option to dist/config.mak 2012-04-24 16:49:11 -04:00
include avoid padding gaps in struct sockaddr_storage 2016-06-09 13:42:06 -04:00
ldso generalize mips-specific reloc code not to hard-code sym/type encoding 2016-03-06 17:25:52 +00:00
src fix failure to obtain EOWNERDEAD status for process-shared robust mutexes 2016-06-27 15:18:13 -04:00
tools add CFI generation script for x86_64 2015-10-13 18:09:46 -04:00
.gitignore support out-of-tree build 2016-01-17 16:34:43 -05:00
configure add powerpc64 port 2016-05-08 22:57:40 -04:00
COPYRIGHT update COPYRIGHT file to clarify that permissions apply for all files 2016-04-28 20:41:45 -04:00
INSTALL update documentation files for mips64 port 2016-03-06 17:48:58 +00:00
Makefile deduplicate __NR_* and SYS_* syscall number definitions 2016-05-12 00:34:05 -05:00
README update version reference in the README file 2014-06-25 14:16:53 -04:00
VERSION release 1.1.14 2016-02-22 00:07:05 -05:00
WHATSNEW release 1.1.14 2016-02-22 00:07:05 -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/