Function SearchSysCache

src/backend/utils/cache/syscache.c:1342–1353

* SearchSysCache * * A layer on top of SearchCatCache that does the initialization and * key-setting for you. * * Returns the cache copy of the tuple if one is found, NULL if not. * The tuple is the 'cache' copy and must NOT be modified! * * When the caller is done using the tuple, call ReleaseSysCache() * to release the reference count grabbed by SearchSysCache(). If this * is not done

 *	CAUTION: The tuple that is returned must NOT be freed by the caller!
 */
HeapTuple
SearchSysCache(int cacheId,
			   Datum key1,
			   Datum key2,
			   Datum key3,
			   Datum key4)
{
	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
		   PointerIsValid(SysCache[cacheId]));

	return SearchCatCache(SysCache[cacheId], key1, key2, key3, key4);
}

HeapTuple
SearchSysCache1(int cacheId,