inet_ntop(3) - phpMan

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 fol-
       lowing 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 appropriate 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.

CONFORMING TO
       POSIX.1-2001.  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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-11-11                      INET_NTOP(3)

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