Man pages matching name fileno in section 3:

fileno.3.de	debian 10 / manpages-de-dev
fileno.3.en	debian 10 / manpages-dev
fileno.3.es	debian 10 / manpages-es
fileno.3.ja	debian 10 / manpages-ja-dev
fileno.3.pl	debian 10 / manpages-pl-dev
fileno.3.zh_CN	debian 10 / manpages-zh
fileno.3.zh_TW	debian 10 / manpages-zh
fileno.3.de	debian 11 / manpages-de-dev
fileno.3.en	debian 11 / manpages-dev
fileno.3.es	debian 11 / manpages-es-dev
fileno.3.fr	debian 11 / manpages-fr-dev
fileno.3.ja	debian 11 / manpages-ja-dev
fileno.3.pl	debian 11 / manpages-pl-dev
fileno.3.zh_CN	debian 11 / manpages-zh
fileno.3.zh_TW	debian 11 / manpages-zh
fileno.3.de	debian 12 / manpages-de-dev
fileno.3.en	debian 12 / manpages-dev
fileno.3.ja	debian 12 / manpages-ja-dev
fileno.3.zh_CN	debian 12 / manpages-zh
fileno.3.zh_TW	debian 12 / manpages-zh