need a systemd

[John Levine]

In article <20200816024739.GB23449 at admin.sibptus.ru> you write:
>-=-=-=-=-=-
>
>Dear Colleagues,
>
>I'm looking for a superdaemon to start, monitor and restart (e.g. in
>case of crash) other daemons like squid, syncthing and others. 
>
>At first I wanted to place them into /etc/ttys but then I realized that
>I need something more flexible like Linux' systemd or Solaris' SMF.
>
>What would you recommend for FreeBSD not as a total rc(8) replacement
>but as a tool to manage some daemons?

Try daemontools which is in ports.  It was written by Dan Bernstein so it
is in his quirky style but it works great.

http://cr.yp.to/daemontools.html

The "daemon" program someone else mentioned is fine for starting a
daemon but not for managing them,