---
title: proto_register_plumber
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.4+]
path: kernel/1532491-proto_register_plumber
---

# proto_register_plumber

## Declaration

```occ
errno_t proto_register_plumber(protocol_family_t proto_fam, ifnet_family_t if_fam, proto_plumb_handler plumb, proto_unplumb_handler unplumb);
```

## Parameters

- `proto_fam`: The protocol family these plumbing functions will handle.
- `if_fam`: The interface family these plumbing functions will handle.
- `plumb`: The function to call to attach the protocol to an interface.
- `unplumb`: The function to call to detach the protocol to an interface, may be NULL in which case ifnet_detach_protocol will be used to detach the protocol.

## Return Value

Return Value A non-zero value of the attach failed.

## Discussion

Discussion Allows the caller to specify the functions called when a protocol is attached to an interface belonging to the specified family and when that protocol is detached.