---
name: "bus_generic_write_ivar"
section: "9"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/bus_generic_read_ivar"
---

# bus\_generic\_write\_ivar(9)

generic implementation of BUS\_READ\_IVAR and BUS\_WRITE\_IVAR for buses

Part of [bus\_generic\_read\_ivar(9)](/bus_generic_read_ivar/9.md).

## NAME

**bus\_generic\_read\_ivar**, **bus\_generic\_write\_ivar** – generic implementation of BUS\_READ\_IVAR and BUS\_WRITE\_IVAR for buses

## SYNOPSIS

**#include \<sys/param.h\>**

**#include \<sys/bus.h\>**

*int*\

**bus\_generic\_read\_ivar**(*device\_t dev*, *device\_t child*, *int index*, *uintptr\_t \*result*);

*int*\

**bus\_generic\_write\_ivar**(*device\_t dev*, *device\_t child*, *int index*, *uintptr\_t value*);

## DESCRIPTION

These functions simply return ENOENT.

## SEE ALSO

[device(9)](/device/9.md), [driver(9)](/driver/9.md)

## AUTHORS

This manual page was written by Doug Rabson.