---
name: "pci_bus_find_capability"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/pci_bus_find_capability"
---

# pci\_bus\_find\_capability(9)

query for devices' capabilities

## NAME

pci\_bus\_find\_capability - query for devices' capabilities

## SYNOPSIS

**int pci\_bus\_find\_capability(struct pci\_bus \*** *bus***, unsigned int** *devfn***, int** *cap***);**

## ARGUMENTS

*bus*

the PCI bus to query

*devfn*

PCI device to query

*cap*

capability code

## DESCRIPTION

Like **pci\_find\_capability** but works for pci devices that do not have a pci\_dev structure set up yet.

Returns the address of the requested capability structure within the device's PCI configuration space or 0 in case the device does not support it.

## COPYRIGHT