unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (Debian-5.0)
Page:
Section:
Apropos / Subsearch:
optional field

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 <&lt;arpa/inet.h>&gt;

       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 (in network byte order) which  is
              converted  to an IPv4 network address in the dotted-decimal for-
              mat,  "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 appro-
              priate 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.

EXAMPLE
       See inet_pton(3).

ERRORS
       EAFNOSUPPORT
              af was not a valid address family.

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

CONFORMING TO
       POSIX.1-2001.   Note  that  RFC 2553 defines a prototype where the last
       argument cnt 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.

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

COLOPHON
       This  page  is  part of release 3.05 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/.



Linux                             2008-06-18                      INET_NTOP(3)