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

# sf_connect_out_func

## Declaration

```occ
typedef errno_t (*sf_connect_out_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 remote address of the outbound connection.

## Return Value

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

## Discussion

Discussion sf_connect_out_func is called to filter outbound connections. A protocol will call this before initiating an outbound connection.