Rich Felker
5cf1ac2443
the old logic here likely dates back, at least in inspiration, to before it was recognized that transient errors must not be allowed to reflect the contents of successful results and must be reported to the application. here, the dns backend for getaddrinfo, when performing a paired query for v4 and v6 addresses, accepted results for one address family even if the other timed out. (the __res_msend backend does not propagate error rcodes back to the caller, but continues to retry until timeout, so other error conditions were not actually possible.) this patch moves the checks to take place before answer parsing, and performs them for each answer rather than only the answer to the first query. if nxdomain is seen it's assumed to apply to both queries since that's how dns semantics work.
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/