INET_NTOP(3)

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() 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(). 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.

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

SEE ALSO
inet_pton(3)

COLOPHON
This page is part of release 2.70 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.