---
title: mbuf_tag_find
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.4+]
path: kernel/1535711-mbuf_tag_find
---

# mbuf_tag_find

## Declaration

```occ
errno_t mbuf_tag_find(mbuf_t mbuf, mbuf_tag_id_t module_id, mbuf_tag_type_t type, size_t *length, void **data_p);
```

## Parameters

- `mbuf`: The mbuf the tag is attached to.
- `module_id`: A module identifier returned by mbuf_tag_id_find.
- `type`: The 16 bit type of the tag to find.
- `length`: Upon success, the length of data will be store in *length.
- `data_p`: Upon successful return, *data_p will point to the buffer allocated for the mtag.

## Return Value

Return Value 0 upon success otherwise the errno error.

## Discussion

Discussion Find the data associated with an mbuf tag.