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Introduce PG_MODULE_MAGIC_EXT macro.

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This macro allows dynamically loaded shared libraries (modules) to
provide a wired-in module name and version, and possibly other
compile-time-constant fields in future.  This information can be
retrieved with the new pg_get_loaded_modules() function.

This feature is expected to be particularly useful for modules
that do not have any exposed SQL functionality and thus are
not associated with a SQL-level extension object.  But even for
modules that do belong to extensions, being able to verify the
actual code version can be useful.

Author: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Yurii Rashkovskii <yrashk@omnigres.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/dd4d1b59-d0fe-49d5-b28f-1e463b68fa32@gmail.com
This commit is contained in:
Tom Lane
2025-03-26 10:59:42 -04:00
parent e92c0632c1
commit 9324c8c580
10 changed files with 248 additions and 28 deletions
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13
contrib/auto_explain/t/001_auto_explain.pl
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@ -212,4 +212,17 @@ REVOKE SET ON PARAMETER auto_explain.log_format FROM regress_user1;
DROP USER regress_user1;
});
# Test pg_get_loaded_modules() function. This function is particularly
# useful for modules with no SQL presence, such as auto_explain.
my $res = $node->safe_psql(
"postgres", q{
SELECT module_name,
version = current_setting('server_version') as version_ok,
regexp_replace(file_name, '\..*', '') as file_name_stripped
FROM pg_get_loaded_modules()
WHERE module_name = 'auto_explain';
});
like($res, qr/^auto_explain\|t\|auto_explain$/, "pg_get_loaded_modules() ok");
done_testing();