tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

resolved: set a description on all our event sources

resolved: don't set TCP_NODELAY twice for TCP sockets We previously set it once in the scope code and once in the stream code. Remove it from the latter, as all other socket options are set in the former.

util-lib: split out allocation calls into alloc-util.[ch]

io-util.h: move iovec stuff from macro.h to io-util.h

util-lib: split out fd-related operations into fd-util.[ch] There are more than enough to deserve their own .c file, hence move them over.

util: introduce CMSG_FOREACH() macro and make use of it everywhere It's only marginally shorter then the usual for() loop, but certainly more readable.

treewide: use log_*_errno whenever %m is in the format string If the format string contains %m, clearly errno must have a meaningful value, so we might as well use log_*_errno to have ERRNO= logged. Using: find . -name '*.[ch]' | xargs sed -r -i -e \ 's/log_(debug|info|notice|warning|error|emergency)\((".*%m.*")/log_\1_errno(errno, \2/' Plus some whitespace, linewrap, and indent adjustments.

resolved: simplify detection of packets from the loopback device We can simplify our code quite a bit if we explicitly check for the ifindex being 1 on Linux as a loopback check. Apparently, this is hardcoded on Linux on the kernel, and effectively exported to userspace via rtnl and such, hence we should be able to rely on it.

shared: add MAXSIZE() and use it in resolved The MAXSIZE() macro takes two types and returns the size of the larger one. It is much simpler to use than MAX(sizeof(A), sizeof(B)) and also avoids any compiler-extensions, unlike CONST_MAX() and MAX() (which are needed to avoid evaluating arguments more than once). This was suggested by Daniele Nicolodi <daniele@grinta.net>. Also make resolved use this macro instead of CONST_MAX(). This enhances readability quite a bit.

resolve: fix compilation on LLVM+clang LLVM+clang does not allow statement-expressions inside of type-declarations (file-scope). Use CONST_MAX() to avoid this.

resolved: IPV6_UNICAST_IF may fail if we already are bound to a device, like we are for link-local addresses

resolved: use CLOCK_BOOTTIME instead of CLOCK_MONOTONIC when aging caches and timeing out transactions That way the cache doens't get confused when the system is suspended.

resolved: when resolving an address PTR record via llmnr, make a tcp connection by default

resolve: add llmnr responder side for UDP and TCP Name defending is still missing.