/usr/share/postgresql/9.4/extension/prioritize--1.0.sql is in postgresql-prioritize 1.0.4-1.1.
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 | CREATE OR REPLACE FUNCTION set_backend_priority(integer, integer)
RETURNS boolean
AS '$libdir/prioritize.so', 'set_backend_priority'
LANGUAGE C VOLATILE;
CREATE OR REPLACE FUNCTION get_backend_priority(integer)
RETURNS integer
AS '$libdir/prioritize.so', 'get_backend_priority'
LANGUAGE C VOLATILE;
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