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(structin_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);

SEE ALSO

Intro(3), htonl(3N), htonl(3XN), inet_addr(3N), inet_addr(3XN), in(5), standards(5)