---
name: "socket_mcjoin4"
section: "3"
platform: "linux"
package: "libowfat-dev"
version: "0.32-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/socket_mcjoin4"
---

# socket\_mcjoin4(3)

join a multicast group

## NAME

socket\_mcjoin4 - join a multicast group

## SYNTAX

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

int **socket\_mcjoin4**(int *s*,const char *groupip*\[4\],const char *interface*\[4\]);

## DESCRIPTION

socket\_mcjoin4 joins the IPv4 multicast group *groupip* on *interface*.

If something goes wrong, socket\_mcjoin4 returns -1, setting errno appropriately.

## SEE ALSO

[socket\_mcleave4(3)](/socket_mcleave4/3.md), [socket\_mcjoin6(3)](/socket_mcjoin6/3.md), [socket\_getifidx(3)](/socket_getifidx/3.md)