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.

sd-netlink: fix assert nl->fd can be 0.

tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy GLIB has recently started to officially support the gcc cleanup attribute in its public API, hence let's do the same for our APIs. With this patch we'll define an xyz_unrefp() call for each public xyz_unref() call, to make it easy to use inside a __attribute__((cleanup())) expression. Then, all code is ported over to make use of this. The new calls are also documented in the man pages, with examples how to use them (well, I only added docs where the _unref() call itself already had docs, and the examples, only cover sd_bus_unrefp() and sd_event_unrefp()). This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we tend to call our destructors these days. Note that this defines no public macro that wraps gcc's attribute and makes it easier to use. While I think it's our duty in the library to make our stuff easy to use, I figure it's not our duty to make gcc's own features easy to use on its own. Most likely, client code which wants to make use of this should define its own: #define _cleanup_(function) __attribute__((cleanup(function))) Or similar, to make the gcc feature easier to use. Making this logic public has the benefit that we can remove three header files whose only purpose was to define these functions internally. See #2008.

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

util-lib: split our string related calls from util.[ch] into its own file string-util.[ch] There are more than enough calls doing string manipulations to deserve its own files, hence do something about it. This patch also sorts the #include blocks of all files that needed to be updated, according to the sorting suggestions from CODING_STYLE. Since pretty much every file needs our string manipulation functions this effectively means that most files have sorted #include blocks now. Also touches a few unrelated include files.

sd-netlink: refcount multicast groups Track the number of matches installed for a given multicast group, and leave the group once no matches depend on it. In order to handle passed-in sockets that are already members of multicast groups we initialize the refcount based on the membership once we take over the socket. This way we will leave the socket in the state we found it once we finish with it. On kernels that do not fully support reading out the multicast group membership we fall back to never leaving any groups (as before).

sd-netlink: don't treat NULL as root type-system Explicitly export the root type-system to the type-system callers. This avoids treating NULL as root, which for one really looks backwards (NULL is usually a leaf, not root), and secondly prevents us from properly debugging calling into non-nested types. Also rename the root to "type_system_root". Once we support more than rtnl, well will have to revisit that, anyway.

sd-netlink: make NLType internal If we extend NLType to support arrays and further extended types, we really want to avoid hard-coding the type-layout outside of netlink-types.c. We already avoid accessing nl_type->type_system outside of netlink-types.c, extend this to also avoid accessing any other fields. Provide accessor functions for nl_type->type and nl_type->size and then move NLType away from the type-system header. With this in place, follow-up patches can safely turn "type_system" and "type_system_union" into a real "union { }", and then add another type for arrays.

sd-netlink: socket - move some functions from main source file

sd-netlink: message - split up source file Split netlink-socket.c and rtnl-message.c from netlink-message.c.