pub fn notify(state: &str) -> Result<bool>Expand description
Send a state message to systemd via $NOTIFY_SOCKET.
Supports both filesystem-path sockets (/run/systemd/notify) and
Linux-abstract sockets (the address starts with @ per
sd_notify(3); common in container images and namespace-gated
hosts). Abstract addresses are routed through libc::sendto with
AF_UNIX and a leading NUL byte — UnixDatagram::connect would
otherwise resolve the path verbatim and fail with ENOENT,
silently breaking the Type=notify readiness handshake.
Returns Ok(false) when $NOTIFY_SOCKET is unset (sozu is not
running under systemd notify supervision; the caller can ignore
this case). Returns Ok(true) when the datagram was sent.
Returns Err(...) for socket / permission failures so the caller
can decide whether to log + continue or fail-fast.
Multiple state lines can be packed into a single message by
joining them with \n (see STATE_READY / STATE_STOPPING).