inet_ntop

Section: Linux Programmer's Manual (3)
Updated: 2000-12-18
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NAME

inet_ntop - Parse network address structures  

SYNOPSIS

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

const char *inet_ntop(int af, const void *src,
                      char *dst, socklen_t cnt);
 

DESCRIPTION

This function converts the network address structure src in the af address family into a character string, which is copied to a character buffer dst, which is cnt bytes long.

inet_ntop(3) extends the inet_ntoa(3) function to support multiple address families, inet_ntoa(3) is now considered to be deprecated in favor of inet_ntop(3). The following address families are currently supported:

AF_INET
src points to a struct in_addr (network byte order format) which is converted to an IPv4 network address in the dotted-quad format, "ddd.ddd.ddd.ddd". The buffer dst must be at least INET_ADDRSTRLEN bytes long.
AF_INET6
src points to a struct in6_addr (network byte order format) which is converted to a representation of this address in the most appropriate IPv6 network address format for this address. The buffer dst must be at least INET6_ADDRSTRLEN bytes long.
 

RETURN VALUE

inet_ntop() returns a non-null pointer to dst. NULL is returned if there was an error, with errno set to EAFNOSUPPORT if af was not set to a valid address family, or to ENOSPC if the converted address string would exceed the size of dst given by the cnt argument.  

CONFORMING TO

POSIX.1-2001. Note that RFC 2553 defines a prototype where the last parameter cnt is of type size_t. Many systems follow RFC 2553. Glibc 2.0 and 2.1 have size_t, but 2.2 has socklen_t.  

SEE ALSO

inet_pton(3)  

BUGS

AF_INET6 converts IPv6-mapped IPv4 addresses into an IPv6 format.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
SEE ALSO
BUGS

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