/usr/share/postgresql/9.5/extension/pageinspect--1.3.sql is in postgresql-contrib-9.5 9.5.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pageinspect" to load this file. \quit
--
-- get_raw_page()
--
CREATE FUNCTION get_raw_page(text, int4)
RETURNS bytea
AS 'MODULE_PATHNAME', 'get_raw_page'
LANGUAGE C STRICT;
CREATE FUNCTION get_raw_page(text, text, int4)
RETURNS bytea
AS 'MODULE_PATHNAME', 'get_raw_page_fork'
LANGUAGE C STRICT;
--
-- page_header()
--
CREATE FUNCTION page_header(IN page bytea,
OUT lsn pg_lsn,
OUT checksum smallint,
OUT flags smallint,
OUT lower smallint,
OUT upper smallint,
OUT special smallint,
OUT pagesize smallint,
OUT version smallint,
OUT prune_xid xid)
AS 'MODULE_PATHNAME', 'page_header'
LANGUAGE C STRICT;
--
-- heap_page_items()
--
CREATE FUNCTION heap_page_items(IN page bytea,
OUT lp smallint,
OUT lp_off smallint,
OUT lp_flags smallint,
OUT lp_len smallint,
OUT t_xmin xid,
OUT t_xmax xid,
OUT t_field3 int4,
OUT t_ctid tid,
OUT t_infomask2 integer,
OUT t_infomask integer,
OUT t_hoff smallint,
OUT t_bits text,
OUT t_oid oid)
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'heap_page_items'
LANGUAGE C STRICT;
--
-- bt_metap()
--
CREATE FUNCTION bt_metap(IN relname text,
OUT magic int4,
OUT version int4,
OUT root int4,
OUT level int4,
OUT fastroot int4,
OUT fastlevel int4)
AS 'MODULE_PATHNAME', 'bt_metap'
LANGUAGE C STRICT;
--
-- bt_page_stats()
--
CREATE FUNCTION bt_page_stats(IN relname text, IN blkno int4,
OUT blkno int4,
OUT type "char",
OUT live_items int4,
OUT dead_items int4,
OUT avg_item_size int4,
OUT page_size int4,
OUT free_size int4,
OUT btpo_prev int4,
OUT btpo_next int4,
OUT btpo int4,
OUT btpo_flags int4)
AS 'MODULE_PATHNAME', 'bt_page_stats'
LANGUAGE C STRICT;
--
-- bt_page_items()
--
CREATE FUNCTION bt_page_items(IN relname text, IN blkno int4,
OUT itemoffset smallint,
OUT ctid tid,
OUT itemlen smallint,
OUT nulls bool,
OUT vars bool,
OUT data text)
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'bt_page_items'
LANGUAGE C STRICT;
--
-- brin_page_type()
--
CREATE FUNCTION brin_page_type(IN page bytea)
RETURNS text
AS 'MODULE_PATHNAME', 'brin_page_type'
LANGUAGE C STRICT;
--
-- brin_metapage_info()
--
CREATE FUNCTION brin_metapage_info(IN page bytea, OUT magic text,
OUT version integer, OUT pagesperrange integer, OUT lastrevmappage bigint)
AS 'MODULE_PATHNAME', 'brin_metapage_info'
LANGUAGE C STRICT;
--
-- brin_revmap_data()
--
CREATE FUNCTION brin_revmap_data(IN page bytea,
OUT pages tid)
RETURNS SETOF tid
AS 'MODULE_PATHNAME', 'brin_revmap_data'
LANGUAGE C STRICT;
--
-- brin_page_items()
--
CREATE FUNCTION brin_page_items(IN page bytea, IN index_oid regclass,
OUT itemoffset int,
OUT blknum int,
OUT attnum int,
OUT allnulls bool,
OUT hasnulls bool,
OUT placeholder bool,
OUT value text)
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'brin_page_items'
LANGUAGE C STRICT;
--
-- fsm_page_contents()
--
CREATE FUNCTION fsm_page_contents(IN page bytea)
RETURNS text
AS 'MODULE_PATHNAME', 'fsm_page_contents'
LANGUAGE C STRICT;
--
-- GIN functions
--
--
-- gin_metapage_info()
--
CREATE FUNCTION gin_metapage_info(IN page bytea,
OUT pending_head bigint,
OUT pending_tail bigint,
OUT tail_free_size int4,
OUT n_pending_pages bigint,
OUT n_pending_tuples bigint,
OUT n_total_pages bigint,
OUT n_entry_pages bigint,
OUT n_data_pages bigint,
OUT n_entries bigint,
OUT version int4)
AS 'MODULE_PATHNAME', 'gin_metapage_info'
LANGUAGE C STRICT;
--
-- gin_page_opaque_info()
--
CREATE FUNCTION gin_page_opaque_info(IN page bytea,
OUT rightlink bigint,
OUT maxoff int4,
OUT flags text[])
AS 'MODULE_PATHNAME', 'gin_page_opaque_info'
LANGUAGE C STRICT;
--
-- gin_leafpage_items()
--
CREATE FUNCTION gin_leafpage_items(IN page bytea,
OUT first_tid tid,
OUT nbytes int2,
OUT tids tid[])
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'gin_leafpage_items'
LANGUAGE C STRICT;
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