---
name: "__dev_get_by_index"
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/__dev_get_by_index"
---

# \_\_dev\_get\_by\_index(9)

find a device by its ifindex

## NAME

\_\_dev\_get\_by\_index - find a device by its ifindex

## SYNOPSIS

**struct net\_device \* \_\_dev\_get\_by\_index(struct net \*** *net***, int** *ifindex***);**

## ARGUMENTS

*net*

the applicable net namespace

*ifindex*

index of device

## DESCRIPTION

Search for an interface by index. Returns **NULL** if the device is not found or a pointer to the device. The device has not had its reference counter increased so the caller must be careful about locking. The caller must hold either the RTNL semaphore or *dev\_base\_lock*.

## COPYRIGHT