The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> arpa/inet.h - definitions for internet operations

#### SYNOPSIS

> `#include <arpa/inet.h>`

#### DESCRIPTION

> The <arpa/inet.h> header shall define the in_port_t and in_addr_t types as described in <netinet/in.h>.

> The <arpa/inet.h> header shall define the in_addr structure as described in <netinet/in.h>.

> The <arpa/inet.h> header shall define the INET_ADDRSTRLEN [IP6] and INET6_ADDRSTRLEN macros as described in <netinet/in.h>.

> The following shall be declared as functions, or 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 <arpa/inet.h> header shall define the uint32_t and uint16_t types 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

> <inttypes.h>, <netinet/in.h>

> XSH htonl, inet_addr, inet_ntop

#### 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() and inet_pton().

#### Issue 7

> SD5-XBD-ERN-6 is applied.

End of informative text.

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