| accept | Accepts a connection on a socket to create a new socket. |
| bind | Binds a name to a socket. |
| connect | Connects two sockets. |
| getdomainname | Gets the name of the current domain. |
| gethostid | Gets the unique identifier of the current host. |
| gethostname | Gets the unique name of the current host. |
| getpeername | Gets the name of the peer socket. |
| getsockname | Gets the socket name. |
| getsockopt | Gets options on sockets. |
| listen | Listens for socket connections and limits the backlog of incoming connections. |
| recv | Receives messages from connected sockets. |
| recvfrom | Receives messages from sockets. |
| recvmsg | Receives a message from any socket. |
| send | Sends messages from a connected socket. |
| sendmsg | Sends a message from a socket by using a message structure. |
| sendto | Sends messages through a socket. |
| send_file | Sends the contents of a file through a socket. |
| setdomainname | Sets the name of the current domain. |
| sethostid | Sets the unique identifier of the current host. |
| sethostname | Sets the unique name of the current host. |
| setsockopt | Sets socket options. |
| shutdown | Shuts down all socket send and receive operations. |
| socket | Creates an end point for communication and returns a descriptor. |
| socketpair | Creates a pair of connected sockets. |
| dn_comp | Compresses a domain name. |
| dn_expand | Expands a compressed domain name. |
| endhostent | Ends retrieval of network host entries. |
| endnetent | Closes the networks file. |
| endprotoent | Closes the /etc/protocols file. |
| endservent | Closes the /etc/service file entry. |
| gethostbyaddr | Gets network host entry by address. |
| gethostbyname | Gets network host entry by name. |
| gethostent | Gets host entry from the /etc/hosts file. |
| getnetbyaddr | Gets network entry by address. |
| getnetbyname | Gets network entry by name. |
| getnetent | Gets network entry. |
| getprotobyname | Gets protocol entry from the /etc/protocols file by protocol name. |
| getprotobynumber | Gets a protocol entry from the /etc/protocols file by number. |
| getprotoent | Gets protocol entry from the /etc/protocols file. |
| _getlong | Retrieves long byte quantities. |
| _getshort | Retrieves short byte quantities. |
| getservbyname | Gets service entry by name. |
| getservbyport | Gets service entry by port. |
| getservent | Gets services file entry. |
| htonl | Converts an unsigned long integer from host byte order to Internet-network byte order. |
| htons | Converts an unsigned short integer from host byte order to Internet-network byte order. |
| inet_addr | Converts Internet addresses to Internet numbers. |
| inet_lnaof | Separates local Internet addresses into their network number and local network address. |
| inet_makeaddr | Makes an Internet address. |
| inet_netof | Separates network Internet addresses into their network number and local network address. |
| inet_network | Converts Internet network addresses in . (dot) notation to Internet numbers. |
| inet_ntoa | Converts an Internet address into an ASCII string. |
| ntohl | Converts an unsigned long integer from Internet-network standard byte order to host byte order. |
| ntohs | Converts an unsigned short integer from Internet-network byte order to host byte order. |
| _putlong | Places long byte quantities into the byte stream. |
| _putshort | Places short byte quantities into the byte stream. |
| rcmd | Allows execution of commands on a remote host. |
| res_init | Searches for a default domain name and Internet address. |
| res_mkquery | Makes query messages for name server. |
| res_query | Provides an interface to the server query mechanism. |
| res_search | Makes a query and awaits a response. |
| res_send | Sends a query to a name server and retrieves a response. |
| rexec | Allows command execution on a remote host. |
| rresvport | Retrieves a socket with a privileged address. |
| ruserok | Allows servers to authenticate clients. |
| sethostent | Opens network host file. |
| setnetent | Opens and rewinds the network file. |
| setprotoent | Opens and rewinds the /etc/protocols file. |
| setservent. | Opens and rewinds the service file. |
| socks5tcp_connect | Connect to a SOCKS version 5 server and request a connection to an external destination. |
| socks5tcp_bind | Connect to a SOCKS version 5 server and request a listening socket for incoming remote connections. |
| socks5tcp_accept | Awaits an incoming connection to a socket from a previous socks5tcp_bind call. |
| socks5udp_associate | Connects to a SOCKS version 5 server and requests a UDP association for subsequent UDP socket communications. |
| socks5udp_sendto | Send UDP packets through a SOCKS version 5 server. |
| socks5_getserv | Returns the address of the SOCKS version 5 server (if any) to use when connecting to a given destination. |
| PF_UNIX | Local communication |
| PF_INET | Internet (TCP/IP) |
| PF_NS | Xerox Network System (XNS) architecture |