See also 
http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/src/gen/libexec/rlogind/rlogind.8.REL=9.2-RELEASE.diff

*** rlogind/rlogind.8.orig	Tue Nov 14 15:48:59 2017
--- rlogind/rlogind.8	Tue Nov 14 15:50:00 2017
***************
*** 63,68 ****
--- 63,82 ----
  Disable keep-alive messages.
  .El
  .Pp
+ .Nm
+ can not be invoked direct (eg by a shell calling /usr/libexec/rlogind
+ .\" (unlike some other daemons eg ssh, to allow a faster response)
+ .\" (as getpeername() returns:
+ .\" rlogind: Can't get peer name of remote host: No such file or directory.
+ ), instead
+ .Nm
+ is started on demand from an
+ .Xr inetd.conf 8
+ line, eg
+ .in +2
+ login stream tcp nowait root /usr/libexec/rlogind rlogind -D
+ .in -2
+ .Pp
  The
  .Nm
  utility listens for service requests at the port indicated in