inet(6F)                        TCP/IP R4.11                        inet(6F)


NAME
       inet - Communications Protocol Internet protocol family

SYNOPSIS
       #include <netinet/in.h>

DESCRIPTION
       The Internet protocol family is a collection of protocols based on
       and including the Internet Protocol (IP), the Transmission Control
       Protocol (TCP), and the User Datagram Protocol (UDP).  Each of these
       protocols uses the Internet address format.

   Addressing
       Internet addresses are four-byte quantities, stored in network
       standard format.  The include file netinet/in.h defines this address
       as a discriminated union wrapped in a struct inaddr.

       Sockets bound to the Internet protocol family utilize the following
       addressing structure:

           struct sockaddrin {
            short      sinfamily;
            ushort    sinport;
            struct     inaddr   sinaddr;
            char  sinzero[8];
       };

       The sinfamily field is stored in host byte order and should be set
       to AF_INET.

       The sinport and sinaddr fields should be stored in network byte
       order.

       Sockets may be created with the address INADDR_ANY to affect
       "wildcard" matching on incoming messages.

   Protocols
       The Internet protocol family consists of the Internet Protocol (IP),
       Internet Control Message Protocol (ICMP), Transmission Control
       Protocol (TCP), and User Datagram Protocol (UDP).  TCP is used to
       support the SOCK_STREAM socket type, while UDP is used to support the
       SOCK_DGRAM socket type.  A raw interface to IP is available by
       creating an Internet socket of type SOCK_RAW.  The ICMP is not
       directly accessible.

SEE ALSO
       byteorder(3N), ip(6P), tcp(6P), udp(6P).


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