I have an application where I would like to read and process rlm_detail records in near-real-time (specifically to turn them into JSON and stuff them into a local database). I'm familiar with rlm_sql_log + radsqlrelay, and I know this is robust. So I was hoping to modify radsqlrelay to work with files being appended to by rlm_detail, but I turned up a wrinkle when checking the file locking in 2.2.x code. rlm_sql_log uses fcntl() locking only; but rlm_detail is different. It calls rad_lockfd_nonblock(), which uses lockf if available, else flock, and only uses fcntl if the other two are not available. It looks like fcntl and flock locks are independent of each other: http://www.mjmwired.net/kernel/Documentation/filesystems/locks.txt Question: what's the safe way to process detail files? Is there a Perl implementation of radrelay I can hack from? Looks like the original C implementation of radrelay was removed in 2005 (acd40e2e) I am aware of raddb/sites-available/buffered-sql, but that only shows how to get freeradius to read a detail file, not a standalone program. Thanks in advance, Brian.