11604b5366
From the announcement[1]
- The GNU C Library will now detect when /etc/resolv.conf has been
modified and reload the changed configuration. The new resolver
option “no-reload” (RES_NORELOAD) disables this behavior.
Since glibc can do it, we don't have to call res_init before every
single getaddrinfo() call. And since we don't need to call res_init, we
don't need to load libresolv.so at all, until we need res_ninit.
We won't do it even if the user configured "no-reload" in
/etc/resolv.conf or RES_NORELOAD in the res variable -- let's assume
that it is the intent, like when /etc/resolv.conf is known to never
change.
[1] https://sourceware.org/ml/libc-alpha/2017-08/msg00010.html
Change-Id: I3868166e5efc45538544fffd14d738d40c375fd1
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
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