inet_ntop - convert IPv4 and IPv6 addresses from binary to text form
#include <arpa/inet.h>
const char *inet_ntop(int af, const void *src,
char *dst, socklen_t size);
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.
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.
- EAFNOSUPPORT
- af was not a valid address family.
- ENOSPC
- The converted address string would exceed the size given by
size.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| inet_ntop () |
Thread safety |
MT-Safe locale |
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.
AF_INET6 converts IPv4-mapped IPv6 addresses into an IPv6 format.
See
inet_pton(3).
getnameinfo(3),
inet(3),
inet_pton(3)