fi_av_remove(3) on Linux
The text 4bd618de2271, as Debian 10 (Buster) shipped it.
Address vector operations fi_av_open / fi_close : Open or close an address vector fi_av_bind : Associate an address vector with an event queue. fi_av_insert / fi_av_insertsvc / fi_av_remove : Insert/remove an address into/from the address vector. fi_av_lookup : Retrieve an address stored in the address vector. fi_av_straddr : Convert an address into a printable string.