IPV6_ADDRFORM2const
Turn an af_inet6 socket into a socket of a different address family
Usage
#include <netinet/in.h> /* Definition of IP* constants */ #include <sys/socket.h>
int setsockopt(int sockfd, IPPROTO_IPV6, IPV6_ADDRFORM, &(const int){AF_INET}, sizeof(int));
Library
Standard C library (libc, -lc)
Overview
Turn an AF_INET6 socket into a socket of a different address family.
Only AF_INET is currently supported for that.
It is allowed only for IPv6 sockets that are connected and bound to a v4-mapped-on-v6 address.
This is useful to pass v4-mapped sockets as file descriptors to programs that don't know how to deal with the IPv6 API.
Errors
See setsockopt(2). See ipv6(7).