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For each supported `PF_*` protocol family, there is a file `/servers/socket/N`
where `N` is the numberic value fo the `PF_*` symbol.  Right now
[[`PF_LOCAL`|translator/pflocal]] (a.k.a. `PF_UNIX`) and
[[`PF_INET`|translator/pfinet]] are supported.

User programs open those files, and use the `socket_create` [[RPC]] to make a
new socket.  With that socket, they can use the other `socket_*` RPCs and also
the `io_*` RPCs.  The `socket_*` RPCs are essentially clones of the Unix
syscalls in question.

The only exception is `sockaddrs`, which are implemented as [[ports|libports]]
instead of the opaque data arrays they are in the syscalls.  You manipulate
`sockaddr` ports with the `socket_create_address`, `socket_fabricate_address`,
and `socket_whatis_address` calls.  The `sockaddr` port is then used in socket
calls like `socket_connect` and `socket_accept`.

`PF_INET` `sockaddr` ports are manipulated with `socket_create_address` from
the usual `struct sockaddr_in`.  `PF_LOCAL` `sockaddr` ports are stored by
`S_IFSOCK` filesystem nodes; you find the address associated with a node with
`ifsock_getsockaddr`.  The [[file_system_server|translator]] will get a
`sockaddr` to return with `socket_fabricate_address`.