fi_accept(3) on Linux
The text 7510a1c2dd93, as Debian 10 (Buster) shipped it.
Connection management operations fi_connect / fi_listen / fi_accept / fi_reject / fi_shutdown : Manage endpoint connection state. fi_setname / fi_getname / fi_getpeer : Set local, or return local or peer endpoint address. fi_join / fi_close / fi_mc_addr : Join, leave, or retrieve a multicast address.