interpreted as the path to a UNIX domain socket. Otherwise the address or node
name are resolved using L<getaddrinfo>.
+For network sockets, a port may be specified by using the form
+I<address>:I<port>. The default port is 42217.
+
+These formats are accepted:
+
+ unix:</path/to/unix.sock>
+ </path/to/unix.sock>
+ <hostname-or-ip>
+ <hostname-or-ip>:<port>
+
If the B<-l> option is not specified the default address,
C<unix:/tmp/rrdcached.sock>, will be used.
the daemon before accessing the files, so they work with up-to-date data even
if the cache timeout is large.
+=head1 ERROR REPORTING
+
+The daemon reports errors in one of two ways: During startup, error messages
+are printed to C<STDERR>. One of the steps when starting up is to fork to the
+background and closing C<STDERR> - after this writing directly to the user is
+no longer possible. Once this has happened, the daemon will send log messages
+to the system logging daemon using L<syslog(3)>. The facility used it
+C<LOG_DAEMON>.
+
=head1 HOW IT WORKS
When receiving an update, B<rrdcached> does not write to disk but looks for an