spawn(8) question

The man page says:

The spawn(8) daemon provides the Postfix equivalent of inetd. It lis-
tens on a port as specified in the Postfix master.cf file and spawns an
external command whenever a connection is established. The connection
can be made over local IPC (such as UNIX-domain sockets) or over non-
local IPC (such as TCP sockets). The command's standard input, output
and error streams are connected directly to the communication endpoint.

But where is the behaviour documented, that these communication endpoints
end up in $queue_directory/private/<servicename> ?

--
Ralf Hildebrandt (Ralf.Hildebrandt@charite.de) spamtrap@charite.de
http://www.postfix-book.com/ Tel. +49 (0)30-450 570-155
Why you can't find your system administrators:
they're busy rerouting their support telephone to the luser of the day