NAME

arpa/inet.h — definitions for internet operations

SYNOPSIS

#include <arpa/inet.h>

DESCRIPTION

The in_port_t and in_addr_t types shall be defined as described in <netinet/in.h>.

The in_addr structure shall be defined as described in <netinet/in.h>.

The INET_ADDRSTRLEN [IP6] and INET6_ADDRSTRLEN macros shall be defined as described in <netinet/in.h>.

The following shall either be declared as functions, defined as macros, or both. If functions are declared, function prototypes shall be provided.

uint32_t htonl(uint32_t);
uint16_t htons(uint16_t);
uint32_t ntohl(uint32_t);
uint16_t ntohs(uint16_t);

The uint32_t and uint16_t types shall be defined as described in <inttypes.h>.

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

in_addr_t    inet_addr(const char *);
char        *inet_ntoa(struct in_addr);
const char  *inet_ntop(int, const void *restrict, char *restrict,
                 socklen_t);
int          inet_pton(int, const char *restrict, void *restrict);

Inclusion of the <arpa/inet.h> header may also make visible all symbols from <netinet/in.h> and <inttypes.h>.

The following sections are informative.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<netinet/in.h>, <inttypes.h>, the System Interfaces volume of IEEE Std 1003.1-2001 (“POSIX.1”), htonl(3), inet_addr(3)

CHANGE HISTORY

First released in Issue 6. Derived from the XNS, Issue 5.2 specification.

The restrict keyword is added to the prototypes for inet_ntop(3) and inet_pton(3).

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