snd_pcm_lib_ioctl
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## Name

snd_pcm_lib_ioctl — a generic PCM ioctl callback

## Synopsis

`int snd_pcm_lib_ioctl (` | struct snd_pcm_substream * substream,
| unsigned int cmd,
| void * arg`)`;

## Arguments

`substream`

  the pcm substream instance

`cmd`

  ioctl command

`arg`

  ioctl argument

## Description

Processes the generic ioctl commands for PCM. Can be passed as the ioctl callback for PCM ops.

## Return

Zero if successful, or a negative error code on failure.

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