Certainly on other UNIXes getpwnam() can need a bunch of different files and sockets depending on what nsswitch.conf backend is in use. I guess OpenBSD doesn't

Certainly on other UNIXes getpwnam() can need a bunch of different files and sockets depending on what nsswitch.conf backend is in use. I guess OpenBSD doesn't support nsswitch at all (it looks like it just uses a pseudo-NIS damon "ypldap" if you want to use LDAP auth) but on most other UNIXes it doesn't work that way. Similar arguments apply to host resolution, but these days it's almost always just /etc/hosts and DNS so less of an issue.