daemon: Add SdNotifyWithFiles and SdNotifyBarrier#520
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This function allows to send an array of additional file descriptors to the service manager. This is mostly used for FDSTORE=1 messages, and BARRIER=1 can be implemented on top of this as well. This corresponds to sd_pid_notify_with_fds in libsystemd, but without pid support. If sd_notify_with_fds existed, that would be the complete equivalent.
This function blocks until all notifications sent before it have been processed by the service manager. This is the equivalent of libsystemd's sd_notify_barrier.
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This PR implements
SdNotifyWithFilesandSdNotifyBarrieron top of the former (replaces abandoned #343).SdNotifyWithFilesmirrorssd_pid_notify_with_fdsfrom libsystemd, except it doesn't have pid support. Ifsd_notify_with_fdsexisted, that would be the complete equivalent. This function is useful forFDSTORE=1state messages.SdNotifyBarrieris implemented on top ofSdNotifyWithFiles. This is full equivalent ofsd_notify_barrier. For example, it's used for synchronization after sendingMAINPID=...message to guarantee that the service manager updates the main PID before the old one exits.sd_notifyman explains all these functions better than I do.