This section describes the functions in the various networking libraries, including the OpenLDAP LDAP library (libldap), the network service library (libnsl), the resolver library (libresolv), the remote procedure call libraries (librpcsvc and librpcsoc), the sockets library (libsocket), the X/Open Federated Naming (XFN) library (libxfn), and the X/Open network service library (libxnet). Readers of this section should be familiar with C programming language constructs.