Man pages matching name strdup in section 3:

strdup.3.de	debian 10 / manpages-de-dev
strdup.3.en	debian 10 / manpages-dev
strdup.3.es	debian 10 / manpages-es
strdup.3.ja	debian 10 / manpages-ja-dev
strdup.3.pl	debian 10 / manpages-pl-dev
strdup.3.pt	debian 10 / manpages-pt-dev
strdup.3.de	debian 11 / manpages-de-dev
strdup.3.en	debian 11 / manpages-dev
strdup.3.es	debian 11 / manpages-es-dev
strdup.3.fr	debian 11 / manpages-fr-dev
strdup.3.ja	debian 11 / manpages-ja-dev
strdup.3.pl	debian 11 / manpages-pl-dev
strdup.3.pt	debian 11 / manpages-pt-dev
strdup.3.de	debian 12 / manpages-de-dev
strdup.3.en	debian 12 / manpages-dev
strdup.3.es	debian 12 / manpages-es-dev
strdup.3.fr	debian 12 / manpages-fr-dev
strdup.3.ja	debian 12 / manpages-ja-dev
strdup.3.pl	debian 12 / manpages-pl-dev