/usr/share/postgresql/9.3/extension/pgrowlocks--1.1.sql is in postgresql-contrib-9.3 9.3.24-0ubuntu0.14.04.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | /* contrib/pgrowlocks/pgrowlocks--1.1.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pgrowlocks" to load this file. \quit
CREATE FUNCTION pgrowlocks(IN relname text,
OUT locked_row TID, -- row TID
OUT locker XID, -- locking XID
OUT multi bool, -- multi XID?
OUT xids xid[], -- multi XIDs
OUT modes text[], -- multi XID statuses
OUT pids INTEGER[]) -- locker's process id
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'pgrowlocks'
LANGUAGE C STRICT;
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