---
name: "socket_mcloop4"
section: "3diet"
platform: "linux"
package: "libowfat-dev"
version: "0.28-2"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/socket_mcloop4/3diet"
---

# socket\_mcloop4(3diet)

set multicast loopback

## NAME

socket\_mcloop4 - set multicast loopback

## SYNTAX

**#include \<socket.h\>**

int **socket\_mcloop4**(int *s*,char *loop*);

## DESCRIPTION

socket\_mcloop4 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\_mcloop4 returns -1, setting errno appropriately.

## SEE ALSO

[socket\_mcloop6(3)](/socket_mcloop6/3.md), [socket\_mcjoin4(3)](/socket_mcjoin4/3.md), [socket\_mcleave4(3)](/socket_mcleave4/3.md)