Option 1 is already provided. The sd_notify function is simply a convenience wrapper for sending messages on a socket specified by the NOTIFY_SOCKET environmen

Option 1 is already provided. The sd_notify function is simply a convenience wrapper for sending messages on a socket specified by the NOTIFY_SOCKET environment variable. See the notes in sd_notify(3) or https://lists.debian.org/debian-ctte/2013/12/msg00230.html https://lists.debian.org/debian-ctte/2013/12/msg00230.html for a simple alternative implementation. Admittedly could be better documented. edit: point to notes section