Man pages matching name readdir in section 3:

readdir.3.de	debian 10 / manpages-de-dev
readdir.3.en	debian 10 / manpages-dev
readdir.3.es	debian 10 / manpages-es
readdir.3.ja	debian 10 / manpages-ja-dev
readdir.3.pt	debian 10 / manpages-pt-dev
readdir.3.de	debian 11 / manpages-de-dev
readdir.3.en	debian 11 / manpages-dev
readdir.3.ja	debian 11 / manpages-ja-dev
readdir.3.pt	debian 11 / manpages-pt-dev
readdir.3.de	debian 12 / manpages-de-dev
readdir.3.en	debian 12 / manpages-dev
readdir.3.fr	debian 12 / manpages-fr-dev
readdir.3.ja	debian 12 / manpages-ja-dev
readdir.3.ru	debian 12 / manpages-ru-dev
readdir.3.de	debian 13 / manpages-de-dev
readdir.3.en	debian 13 / manpages-dev
readdir.3.fr	debian 13 / manpages-fr-dev
readdir.3.ja	debian 13 / manpages-ja-dev
readdir.3.ro	debian 13 / manpages-ro-dev
readdir.3.ru	debian 13 / manpages-ru-dev