inet_ntop - phpMan

inet_ntop(3)               Linux Programmer’s Manual              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(3)  extends  the  inet_ntoa(3) function to support multiple address fami-
       lies, 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 con-
              verted  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  con-
              verted to a representation of this address in the most appropriate IPv6 net-
              work 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 1003.1-2001.  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.



Linux Man Page                    2000-12-18                      inet_ntop(3)

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