Connect to the addresses from `getaddrinfo(3)`,
alternating between address family,
starting with ipv6 and wait `fetchConnDelay`
between each connection attempt.
If a connection is established within the attempts,
use this connection and close all others.
If `connect(3)` returns `ENETUNREACH`, don't attempt more
connections with the failing address family.
If there are no more addresses to attempt,
wait for `fetchConnTimeout` and return the first established
connection.
If no connection was established within the timeouts,
close all sockets and return -1 and set errno to
`ETIMEDOUT`.
libfetch from NetBSD's pkgsrc has been imported into lib/fetch, but
the objects are embedded into libxbps. Only a public function to fetch
files has been implemented: xbps_fetch_file().
The library now is built with -fvisibility=hidden by default, and
exported symbols are the ones that use the SYMEXPORT macro.
The code works well enough, but will need many more cleanups.
--HG--
extra : convert_revision : xtraeme%40gmail.com-20091027004600-0lq9aao67lisbzxv
