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-daemon: fix potential LISTEN_FDS overflow in sd_listen_fds()

sd-daemon: explicitly filter out -1 when parsing watchdog timeout We already filter out 0, and as -1 is usually special (meaning infinity, as in USEC_INFINITY) we should better not accept it either. Better safe than sorry...

sd-daemon: verify NOTIFY_SOCKET path length Better generate a real error then simply connect to the wrong socket.

sd-daemon: increase sd_notify() socket buffer size Let's make sure we don't start blocking on sd_notify() earlier than necessary, let's bump the socket buffer sizes to 8M. We already do something similar for our logging socket buffers, hence apply a similar bump here.

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

util-lib: move a number of fs operations into fs-util.[ch]

util-lib: split string parsing related calls from util.[ch] into parse-util.[ch]

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-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-daemon: wipe out memory before using CMSG_NXTHDR() CMSG_NXTHDR() checks for cmsg->cmsg_len *after* it increased the pointer. While this makes sense for parsing received messages, that's a pitfall for code crafting messages with this macro. Wipe out the allocated memory to fix this.

sd-daemon: simply code simplification No change in behaviour, just make the code more obvious.

core: add support for naming file descriptors passed using socket activation This adds support for naming file descriptors passed using socket activation. The names are passed in a new $LISTEN_FDNAMES= environment variable, that matches the existign $LISTEN_FDS= one and contains a colon-separated list of names. This also adds support for naming fds submitted to the per-service fd store using FDNAME= in the sd_notify() message. This also adds a new FileDescriptorName= setting for socket unit files to set the name for fds created by socket units. This also adds a new call sd_listen_fds_with_names(), that is similar to sd_listen_fds(), but also returns the names of the fds. systemd-activate gained the new --fdname= switch to specify a name for testing socket activation. This is based on #1247 by Maciej Wereski. Fixes #1247.

sd-daemon: fix sd_is_mq for non-mq fds mq_getattr returns -1/EBADF for file descriptors which are not mq. But we should return 0 in this case. We first check that fd is a valid fd, so we can assume that if mq_getattr returns EBADF, it is simply a non-mq fd. There is a slight race, but there doesn't seem to be a nice way to fix it.

sd-daemon: Simplify sd_booted() check We can just use access() to check whether /run/system/system/ is a directory, no need to involve stat(). The trick is to suffix the path name with a dash.

sd_pid_notify_with_fds: fix computing msg_controllen CMSG_SPACE(0) may return value other than 0. This caused sendmsg to fail with EINVAL, when have_pid or n_fds was 0.

sd-daemon: return EBADF for invalid fd numbers This matches what open(2) and other system functions do.

sd-daemon: simplify sd_pid_notify_with_fds Coverity was complaining that CMSG_NXTHDR is used without checking the return value. In this case it cannot fail, but it is a good excuse to simplify the function a bit. CID #1261726.

sd-daemon: replace VLA with alloca(), to make llvm happy https://bugs.freedesktop.org/show_bug.cgi?id=89379

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.

core: add new logic for services to store file descriptors in PID 1 With this change it is possible to send file descriptors to PID 1, via sd_pid_notify_with_fds() which PID 1 will store individually for each service, and pass via the usual fd passing logic on next invocation. This is useful for enable daemon reload schemes where daemons serialize their state to /run, push their fds into PID 1 and terminate, restoring their state on next start from the data in /run and passed in from PID 1. The fds are kept by PID 1 as long as no POLLHUP or POLLERR is seen on them, and the service they belong to are either not dead or failed, or have a job queued.

sd-daemon,man: ignore missing $WATCHDOG_PID Systemd 209 started setting $WATCHDOG_PID, and sd-daemon watch was modified to check for this variable. This means that sd_watchdog_enabled() stopped working with previous versions of systemd. But sd-event is a public library and API and we must keep it working even when a program compiled with a newer version of the libary is used on a system running an older version of the manager. getenv() and unsetenv() are fairly expensive calls, so optimize sd_watchdog_enabled() by not calling them when unnecessary. man: centralize the description of $WATCHDOG_PID and $WATCHDOG_USEC in the sd_watchdog_enabled manpage. It is better not to repeat the same stuff in two places.

libsystemd: make use of our common sockaddr_union everywhere

sd-daemon: introduce sd_pid_notify() and sd_pid_notifyf() sd_pid_notify() operates like sd_notify(), however operates on a different PID (for example the parent PID of a process). Make use of this in systemd-notify, so that message are sent from the PID specified with --pid= rather than the usually shortlived PID of systemd-notify itself. This should increase the likelyhood that PID 1 can identify the cgroup that the notification message was sent from properly.

sd-daemon: fix incorrect variable access

build-sys: merge libsystemd-daemon into libsystemd