lfc_setfsize(3) on Linux
The text 81b74c356129, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
set filesize for a regular file; set also last modification time to the current time