Rich Felker
f381c118b2
despite not being documented to do so in the standard or Linux documentation, attempts to udp connect to 127.0.0.1 or ::1 generate EADDRNOTAVAIL when the loopback device is not configured and there is no default route for IPv6. this caused getaddrinfo with AI_ADDRCONFIG to fail with EAI_SYSTEM and EADDRNOTAVAIL on some no-IPv6 configurations, rather than the intended behavior of detecting IPv6 as unsuppported and producing IPv4-only results. previously, only EAFNOSUPPORT was treated as unavailability of the address family being probed. instead, treat all errors related to inability to get an address or route as conclusive that the family being probed is unsupported, and only fail with EAI_SYSTEM on other errors. further improvements may be desirable, such as reporting EAI_AGAIN instead of EAI_SYSTEM for errors which are expected to be transient, but this patch should suffice to fix the serious regression.
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/