Editing Berkeley sockets (section)

==Header files==
The Berkeley socket interface is defined in several header files. The names and content of these files differ slightly between implementations.  In general, they include:
{| class=wikitable
!File || Description
|-
|sys/socket.h || Core socket functions and data structures.
|-
|netinet/in.h || AF_INET and AF_INET6 address families and their corresponding protocol families, PF_INET and PF_INET6.  These include standard IP addresses and TCP and UDP port numbers.
|-
|sys/un.h || PF_UNIX and PF_LOCAL address family. Used for local communication between programs running on the same computer.
|-
|arpa/inet.h || Functions for manipulating numeric IP addresses.
|-
|netdb.h || Functions for translating protocol names and host names into numeric addresses.  Searches local data as well as name services.
|}