---
title: pre_output
framework: kernel
role: symbol
role_heading: Instance Property
path: kernel/ifnet_attach_proto_param/1524845-pre_output
---

# pre_output

The function to be called for outbound packets.

## Declaration

```occ
proto_media_preout pre_output;
```

## See Also

### Fields

- [demux_array](kernel/ifnet_attach_proto_param/1525038-demux_array.md)
- [demux_count](kernel/ifnet_attach_proto_param/1525033-demux_count.md)
- [input](kernel/ifnet_attach_proto_param/1524849-input.md)
- [event](kernel/ifnet_attach_proto_param/1524843-event.md)
- [ioctl](kernel/ifnet_attach_proto_param/1525050-ioctl.md)
- [detached](kernel/ifnet_attach_proto_param/1524863-detached.md)