Copyright (c) 1983 Regents of the University of California.
All rights reserved. The Berkeley software License Agreement
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@(#)inet.4 5.1 (Berkeley) 05/15/85

C 5 inet - Internet protocol family #include <sys/types.h>

#include <netinet/in.h>

2.94 went to 2.6, 3.64 to 3.30
.. 3.5i went to 3.8i
.. The Internet protocol family is a collection of protocols layered atop the Internet Protocol (IP) transport layer, and utilizing the Internet address format. The Internet family provides protocol support for the SOCK_STREAM, SOCK_DGRAM, and SOCK_RAW socket types; the SOCK_RAW interface provides access to the IP protocol. Internet addresses are four byte quantities, stored in network standard format (on the VAX these are word and byte reversed). The include file < netinet/in.h > defines this address as a discriminated union.

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

._f
struct sockaddr_in {
 short sin_family;
 u_short sin_port;
 struct in_addr sin_addr;
 char sin_zero[8];
};

Sockets may be created with the address INADDR_ANY to effect \*(lqwildcard\*(rq matching on incoming messages. The Internet protocol family is comprised of the IP transport protocol, Internet Control Message Protocol (ICMP), Transmission Control Protocol (TCP), and User Datagram Protocol (UDP). TCP is used to support the SOCK_STREAM abstraction while UDP is used to support the SOCK_DGRAM abstraction. A raw interface to IP is available by creating an Internet socket of type SOCK_RAW. The ICMP message protocol is not directly accessible. tcp(4P), udp(4P), ip(4P) The Internet protocol support is subject to change as the Internet protocols develop. Users should not depend on details of the current implementation, but rather the services exported.