---
name: "oss_userdev"
section: "7"
platform: "linux"
package: "oss4-base"
version: "4.2-build2010-2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/oss_userdev"
---

# oss\_userdev(7)

OSS client/server audio pseudo device.

## NAME

**oss\_userdev** - OSS client/server audio pseudo device.

## NOTICE

**This audio device is not designed to be used as-is by the users. It requires** **a specially designed server application that implements the actual service** **(please see the OSS programming documentation for more info). The server**  **application will then create the audio devices that can be used to record** **and/or play audio.**

## DESCRIPTION

**The oss\_userdev driver is a special purpose loop back audio device that can be** **used when implementing OSS audio devices based on a server running in the** **background.**

## OPTIONS

- •

  **userdev\_visible\_clientnodes=0\|1** **By default (0) common client device node (/dev/oss/oss\_userdev0/client) will** **be created for all server instances. The clients will then get directed to the** **right instance based on some search criteria (for example UID). This**  **alternative is best when using single server application that can serve large** **number of different sesions.**

**If this option** **is set to 1 then OSS will create separate client device nodes for each**  **instance. Applications will have to open the right device nodes. This**  **alternative is best when oss\_userdev is used to create different kind of** **services in one system. In this way for example a VoIP link can be accessed** **by opening a different device node than when opening some other service.**

## FILES

- **/etc/oss4/conf/oss\_userdev.conf**

  **Device configuration file.**

## AUTHOR

**4Front Technologies**