NAME

netinet/in.h - Internet Protocol family

SYNOPSIS

#include <netinet/in.h>

DESCRIPTION

When header file <netinet.h> is included, the following types are defined 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 at least the following member:

 

in_addr_t      s_addr

The <netinet/in.h> header defines the sockaddr_in structure that includes at least the following members:

 

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

The sockaddr_in structure 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 defined in this document.

The <netinet/in.h> header defines the type sa_family_t as described in <sys/socket.h>.

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

IPPROTO_IP

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

IPv4 local host address

INADDR_BROADCAST

IPv4 broadcast address

The <netinet/in.h> header defines the following macro to help applications declare buffers of the proper size to store IPv4 addresses in string form:

 

INET_ADDRSTRLEN    16

ntohl(), ntohs(), htonl() and htons() as defined in the description of <arpa/inet.h> are available. Inclusion of the <netinet/in.h> header may also make visible all symbols from <arpa/inet.h>.

SEE ALSO

getsockopt(), setsockopt(). <sys/socket.h>.

CHANGE HISTORY

First released in Issue 4.