ultrix man page for inet_ntop

INET_NTOP(3)						     Linux Programmer's Manual						      INET_NTOP(3)

NAME
       inet_ntop - convert IPv4 and IPv6 addresses from binary to text form

SYNOPSIS
       #include <arpa/inet.h>

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

DESCRIPTION
       This  function converts the network address structure src in the af address family into a character string.  The resulting string is copied
       to the buffer pointed to by dst, which must be a non-null pointer.  The caller specifies the number of bytes available in  this	buffer	in
       the argument size.

       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 (in network byte order) which is converted to an IPv4 network address in the  dotted-decimal  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 (in network byte order) which is converted to a representation of this address in the most appropri-
	      ate IPv6 network address format for this address.  The buffer dst must be at least INET6_ADDRSTRLEN bytes long.

RETURN VALUE
       On success, inet_ntop() returns a non-null pointer to dst.  NULL is returned if there was an error, with errno set to indicate the error.

ERRORS
       EAFNOSUPPORT
	      af was not a valid address family.

       ENOSPC The converted address string would exceed the size given by size.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +------------+---------------+----------------+
       |Interface   | Attribute     | Value	     |
       +------------+---------------+----------------+
       |inet_ntop() | Thread safety | MT-Safe locale |
       +------------+---------------+----------------+

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.  Note that RFC 2553 defines a prototype where the last argument size is of type size_t.   Many  systems  follow
       RFC 2553.  Glibc 2.0 and 2.1 have size_t, but 2.2 and later have socklen_t.

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

EXAMPLE
       See inet_pton(3).

SEE ALSO
       getnameinfo(3), inet(3), inet_pton(3)

COLOPHON
       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							      INET_NTOP(3)