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_INETsrc 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_INET6src 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.
af was not a
valid address family.
The converted address string would exceed the size
given by size.
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.