Man page - inet_ntop(3)

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Manual

inet_ntop

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
BUGS
EXAMPLES
SEE ALSO

NAME

inet_ntop - convert IPv4 and IPv6 addresses from binary to text form

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <arpa/inet.h>

const char *inet_ntop(int af , const void *restrict src ,
char dst [restrict . size ], 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).

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STANDARDS

POSIX.1-2008.

HISTORY

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 .

BUGS

AF_INET6 converts IPv4-mapped IPv6 addresses into an IPv6 format.

EXAMPLES

See inet_pton (3).

SEE ALSO

getnameinfo (3), inet (3), inet_pton (3)