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
              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.

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 5.02 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)