---
title: sf_bind_func
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.4+]
path: kernel/sf_bind_func
---

# sf_bind_func

## Declaration

```occ
typedef errno_t (*sf_bind_func)(void *cookie, socket_t so, const struct sockaddr *to);
```

## Parameters

- `cookie`: Cookie value specified when the filter attach was called.
- `so`: The socket the filter is attached to.
- `to`: The local address of the socket will be bound to.

## Return Value

Return Value Return: 0 - The caller will continue with normal processing of the bind. EJUSTRETURN - The caller will return with a value of 0 (no error) from that point without further processing the bind command. The protocol layer will not see the call. Anything Else - The caller will rejecting the bind.

## Discussion

Discussion sf_bind_func is called before performing a bind operation on a socket.