| INET(4) | Device Drivers Manual | INET(4) | 
inet —
#include <sys/types.h>
#include <netinet/in.h>
SOCK_STREAM, SOCK_DGRAM, and
  SOCK_RAW socket types; the
  SOCK_RAW interface provides access to the IP protocol.
<netinet/in.h> defines this
  address as a discriminated union.
Sockets bound to the Internet protocol family use the following addressing structure,
struct sockaddr_in {
	uint8_t		sin_len;
	sa_family_t	sin_family;
	in_port_t	sin_port;
	struct in_addr	sin_addr;
	int8_t		sin_zero[8];
};
Sockets may be created with the local address
    INADDR_ANY to effect “wildcard”
    matching on incoming messages. The address in a
    connect(2) or
    sendto(2) call may be given as
    INADDR_ANY to mean “this host”. The
    distinguished address INADDR_BROADCAST is allowed as
    a shorthand for the broadcast address on the primary network if the first
    network configured supports broadcast.
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 accessible from
  a raw socket.
The 32-bit Internet address contains both network and host parts.
    It is frequency-encoded; the most-significant bit is clear in Class A
    addresses, in which the high-order 8 bits are the network number. Class B
    addresses use the high-order 16 bits as the network field, and Class C
    addresses have a 24-bit network part. Sites with a cluster of local networks
    and a connection to the Internet may chose to use a single network number
    for the cluster; this is done by using subnet addressing. The local (host)
    portion of the address is further subdivided into subnet and host parts.
    Within a subnet, each subnet appears to be an individual network;
    externally, the entire cluster appears to be a single, uniform network
    requiring only a single routing entry. Subnet addressing is enabled and
    examined by the following
    ioctl(2) commands on a datagram
    socket in the Internet domain; they have the same form as the
    SIOCIFADDR command (see
    netintro(4)).
SIOCSIFNETMASKSIOCGIFNETMASKStuart Sechrest, An Introductory 4.4BSD Interprocess Communication Tutorial. (see /usr/share/doc/psd/20.ipctut)
Samuel J. Leffler, Robert S. Fabry, William N. Joy, Phil Lapsley, Steve Miller, and Chris Torek, Advanced 4.4BSD IPC Tutorial. (see /usr/share/doc/psd/21.ipc)
inet protocol interface appeared in
  4.2BSD.
| May 15, 2003 | NetBSD 9.4 |