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.

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 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.

bus-proxy: don't filter directed signals NameAcquired and NameLost are directed signals. Never ever filter them on dbus1. On dbus1, filters *exclusively* apply to broadcasts! Hence, we must always forward directed signals unconditionally!

bus-proxy: fix NameAcquired and NameLost to be directed The NameAcquired and NameLost signals are _directed_ signals. Make sure we properly set the destination correctly, and verify it in our proxy-test.

bus-proxy: never pass on unmatched broadcasts The lovely libvirtd goes into crazy mode if it receives broadcasts that it didn't subscribe to. With bus-proxyd, this might happen in 2 cases: 1) The kernel passes us an unmatched signal due to a false-positive bloom-match. 2) We generate NameOwnerChanged/NameAcquired/NameLost locally even though the peer didn't subscribe to it. dbus-daemon is reliable in what signals it passes on. So make sure we follow that style. Never ever send a signal to a local peer if it doesn't match an installed filter of that peer.

bus-proxy: add support for "GetConnectionCredentials" method GetConnectionCredentials method was added to dbus-1 specification more than one year ago. This method should return "[...] as many credentials as possible for the process connected to the server", but at this moment only "UnixUserID", "LinuxSecurityLabel" and "ProcessID" are defined by the specification. We should add support for next credentials after extending dbus-1 spec.

remove unused includes This patch removes includes that are not used. The removals were found with include-what-you-use which checks if any of the symbols from a header is in use.

bus-proxy: whenever we cannot forward a message, report this back to caller, but don't exit Errors like EPERM from the kernel should certainly not be reason to exit. Let's try to be defensive here, and try to continue on most send errors, but possibly tell the sender about it.

bus-proxy: rename synthetic_reply_return_strv() to synthetic_reply_method_return_strv() That way it matches more closely the nomenclature of our other success reply calls.

bus-proxyd: move synthesize_name_acquired() Move synthesize_name_acquired() to synthesize.c.

bus-proxy: factor out code for driver handling and message synthesis Move synthesize_*() into synthesize.c and bus_proxy_process_driver() into driver.c for better code separation.