IN.H(3HEAD) Headers IN.H(3HEAD)

NAME

in.h, in - Internet Protocol family

SYNOPSIS

#include <netinet/in.h>

DESCRIPTION

The <netinet/in.h> header defines the following types through typedef:

in_port_t
An unsigned integral type of exactly 16 bits.


in_addr_t
An unsigned integral type of exactly 32 bits. The
<netinet/in.h> header defines the in_addr structure that
includes the following member:


The <netinet/in.h> header defines the in_addr structure that includes the
following member:

in_addr_t s_addr


The <netinet/in.h> header defines the type sa_family_t as described in
socket.h(3HEAD).


The <netinet/in.h> header defines the following macros for use as values
of the level argument of getsockopt() and setsockopt():

IPPROTO_IP
Dummy for IP


IPPROTO_ICMP
Control message protocol


IPPROTO_TCP
TCP


IPPROTO_UDP
User datagram protocol The <netinet/in.h> header
defines the following macros for use as destination
addresses for connect(), sendmsg(), and sendto():


INADDR_ANY
Local host address


INADDR_BROADCAST
Broadcast address


The <netinet/in.h> header defines the sockaddr_in structure that is used
to store addresses for the Internet protocol family. Values of this type
must be cast to struct sockaddr for use with the socket interfaces.

Default

For applications that do not require standard-conforming behavior (those
that use the socket interfaces described in section (3SOCKET) of the
reference manual; see Intro(3) and standards(7)), the <netinet/in.h>
header defines the sockaddr_in structure that includes the following
members:

sa_family_t sin_family
in_port_t sin_port
struct in_addr sin_addr
char sin_zero[8]

Standard conforming

For applications that require standard-conforming behavior (those that
use the socket interfaces described in section (3XNET) of the reference
manual; see Intro(3) and standards(7)), the <netinet/in.h> header defines
the sockaddr_in structure that includes the following members:

sa_family_t sin_family
in_port_t sin_port
struct in_addr sin_addr
unsigned char sin_zero[8]

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+

SEE ALSO

Intro(3), socket.h(3HEAD), connect(3SOCKET), getsockopt(3SOCKET),
sendmsg(3SOCKET), sendto(3SOCKET), setsockopt(3SOCKET),
sockaddr(3SOCKET), connect(3XNET), getsockopt(3XNET), sendmsg(3XNET),
sendto(3XNET), setsockopt(3XNET), attributes(7), standards(7)

August 30, 2002 IN.H(3HEAD)