diff --git a/program/examples/rrdcached/RRDCached.pm b/program/examples/rrdcached/RRDCached.pm
--- /dev/null
@@ -0,0 +1,90 @@
+
+use strict;
+use warnings;
+
+package RRDCached;
+
+=head1 RRDCached
+
+This module implements the B<RRDCached> client protocol for bulk updates.
+
+=head1 SYNOPSIS
+
+ my $cache = RRDCached->new('unix:/var/run/rrdcached.sock')
+ or die "Cannot connect to RRDCached";
+
+ $cache->update('file1.rrd', 'N:10:2:78');
+ $cache->update('file2.rrd', '1222973760:30:0:9', 'N:68:1:55');
+ ...
+
+ $cache->done();
+
+=cut
+
+use IO::Socket;
+
+#################################################################
+
+sub new {
+ my ($class, $daemon) = @_;
+ my $this = {};
+
+ $daemon ||= $ENV{RRDCACHED_ADDRESS};
+ defined $daemon or return undef;
+
+ my $sock_family = "INET";
+
+ if ($daemon =~ m{^unix: | ^/ }x)
+ {
+ $sock_family = "UNIX";
+ $daemon =~ s/^unix://;
+ }
+
+ my $sock = "IO::Socket::$sock_family"->new($daemon)
+ or die "Cannot connect to daemon";
+
+ $sock->printflush("BATCH\n");
+
+ my $go = $sock->getline;
+ warn "We didn't get go-ahead from rrdcached" unless $go =~ /^0/;
+
+ $sock->autoflush(0);
+
+ bless { sock => $sock,
+ daemon => $daemon,
+ }, $class;
+}
+
+sub update {
+ my $this = shift;
+ my $file = shift;
+ ## @updates = @_;
+
+ @_ or warn "No updates for $file!";
+
+ ## rrdcached doesn't handle N: timestamps
+ my $now = time();
+ s/^N(?=:)/$now/ for (@_);
+
+ $this->{sock}->print("update $file @_\n");
+}
+
+sub done {
+ my ($this) = @_;
+
+ my $sock = delete $this->{sock};
+
+ $sock->printflush(".\n");
+ my $errs = $sock->getline;
+
+ my ($num_err) = $errs =~ /^(\d+)/;
+ return unless $num_err;
+
+ $sock->getline for (1..$num_err);
+
+ $sock->close;
+}
+
+#################################################################
+
+1;