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INET_NTOP(3) Linux Programmer's Manual INET_NTOP(3)

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)

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2017-09-15 Linux