socket_mcloop6(3) - Linux man page
Name
socket_mcloop6 - set multicast loopbackSyntax
#include <socket.h>int socket_mcloop6(int s,char loop);
Description
socket_mcloop6 activates multicast loopback for the socket s if loop is non-zero, and deactivates it otherwise. If loopback is activated, packets sent on this socket will be received on the same host.If something goes wrong, socket_mcloop6 returns -1, setting errno appropriately.