---
title: "sock_leave_multicast_v4()"
description: "Leaves a particular multicast IPv4 group."
url: "https://wasix.org/docs/api-reference/wasix/sock_leave_multicast_v4/"
markdown: "https://wasix.org/docs/api-reference/wasix/sock_leave_multicast_v4.md"
---

# `sock_leave_multicast_v4()`

Leaves a particular multicast IPv4 group.

## Description

The `sock_leave_multicast_v4()` function allows a socket to leave a specified multicast IPv4 group on a specific interface.

## Syntax

```ebnf
  ;;; Leaves a particular multicast IPv4 group
  (@interface func (export "sock_leave_multicast_v4")
    ;;; Socket descriptor
    (param $fd $fd)
    ;;; Multicast group to leave
    (param $multiaddr (@witx const_pointer $addr_ip4))
    ;;; Interface that will left
    (param $interface (@witx const_pointer $addr_ip4))
    (result $error (expected (error $errno)))
  )
```

## Parameters

- `ctx`: A mutable reference to the function environment.
- `sock`: The socket descriptor.
- `multiaddr`: A WebAssembly pointer to the IPv4 multicast group to be left.
- `iface`: A WebAssembly pointer to the IPv4 interface to leave the multicast group.

## Return Value

The function returns an `Errno` value indicating the outcome of the operation. If the operation is successful, `Errno::Success` is returned. If an error occurs, an appropriate `Errno` value is returned.

## Notes

- The `sock_leave_multicast_v4()` function allows a socket to leave a specified multicast IPv4 group on a specific interface.
- The `multiaddr` parameter specifies the IPv4 multicast group to leave.
- The `iface` parameter specifies the IPv4 interface from which to leave the multicast group.
- The behavior and limitations of the `sock_leave_multicast_v4()` function may vary depending on the specific runtime environment and underlying networking implementation. It is important to consult the documentation or specifications of the specific environment to understand its behavior in that context.

---

[Documentation index](https://wasix.org/llms.txt) · [HTML version](https://wasix.org/docs/api-reference/wasix/sock_leave_multicast_v4/)