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$ sudo mkfifo /var/log/blackhole.pipe

$ cat /etc/syslog.conf 
...
# test logger script
local1.*      |/var/log/blackhole.pipe

$ logger -p local1.info "test test"
$ logger -p local1.info "test test"
$ logger -p local1.info "test test"
$ logger -p local1.info "test test2"

$ cat /var/log/blackhole.pipe
Oct  3 11:16:09 localhost plankton: test test
Oct  3 11:16:15 localhost last message repeated 2 times
Oct  3 11:16:19 localhost plankton: test test2

$ cat process_blackhole.pl 
#!/usr/bin/perl -w
...
# should never really come down here ...
close $fifo_fh;
exit(0);

$ sudo ./process_blackhole.pl 
read from pipe [Oct  3 11:22:45 localhost plankton: test test]
read from pipe [Oct  3 11:22:52 localhost plankton: test test2]