Man pages matching name dlmopen in section 3:

dlmopen.3.en	debian 10 / manpages-dev
dlmopen.3.pl	debian 10 / manpages-pl-dev
dlmopen.3.en	debian 11 / manpages-dev
dlmopen.3.en	debian 12 / manpages-dev
dlmopen.3.fr	debian 12 / manpages-fr-dev
dlmopen.3.ja	debian 12 / manpages-ja-dev
dlmopen.3.ru	debian 12 / manpages-ru-dev