inet(5)

NAME

inet − definitions for internet operations

SYNOPSIS

#include <arpa/inet.h>

DESCRIPTION

The <arpa/inet.h> header defines the type in_port_t, the type in_addr_t, and the in_addr structure, as described in in(5).

Inclusion of the <arpa/inet.h> header may also make visible all symbols from in(5).

The following are declared as functions, and may also be defined as macros:

in_addr_t	inet_addr(const char ∗cp);
in_addr_t	inet_lnaof(struct in_addr in);
struct in_addr	inet_makeaddr(in_addr_t net, in_addr_t lna);
in_addr_t	inet_netof(struct in_addr in);
in_addr_t	inet_network(const char ∗cp);
char	∗inet_ntoa(struct in_addr in);

Default

For applications that do not require standard-conforming behavior (those that use the socket interfaces described in section 3N of the reference manual; see Intro(3) and standards(5)), the following may be declared as functions, or defined as macros, or both:

uint32_t	htonl(uint32_t hostlong);
uint16_t	htons(uint16_t hostshort);
uint32_t	ntohl(uint32_t netlong);
uint16_t	ntohs(uint16_t netshort);

Standard-conforming

For applications that require standard-conforming behavior (those that use the socket interfaces described in section 3XN of the reference manual; see Intro(3) and standards(5)), the following may be declared as functions, or defined as macros, or both:

in_addr_t	htonl(in_addr_t hostlong);
in_port_t	htons(in_port_t hostshort);
in_addr_t	ntohl(in_addr_t netlong);
in_port_t	ntohs(in_port_t netshort);

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