Manpages - inet_ntop.3
Table of Contents
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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 *restrict src, char *restrict 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.
EXAMPLES
See *inet_pton*(3).
SEE ALSO
*getnameinfo*(3), *inet*(3), *inet_pton*(3)
COLOPHON
This page is part of release 5.13 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/.