linux-2.6.33/snd_pcm_playback_ioctl1()

参照元†

• linux-2.6.33/snd_pcm_kernel_ioctl()
• linux-2.6.33/snd_pcm_playback_ioctl()

説明†

• パス: linux-2.6.33/sound/core/pcm_native.c

• FIXME: これは何？
  • 説明

引数†

• struct file *file
  • linux-2.6.33/file
• struct snd_pcm_substream *substream
  • linux-2.6.33/snd_pcm_substream
• unsigned int cmd
• void __user *arg

返り値†

• int

参考†

実装†

static int snd_pcm_playback_ioctl1(struct file *file,
				   struct snd_pcm_substream *substream,
				   unsigned int cmd, void __user *arg)
{
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
		return -EINVAL;

• • linux-2.6.33/snd_BUG_ON()

• linux-2.6.33/SNDRV_PCM_STREAM_PLAYBACK

	switch (cmd) {
	case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
	{
		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
		snd_pcm_sframes_t result;

• • linux-2.6.33/SNDRV_PCM_IOCTL_WRITEI_FRAMES

• linux-2.6.33/snd_xferi

• • linux-2.6.33/snd_pcm_runtime

• linux-2.6.33/snd_pcm_sframes_t

		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;

• • runtime->status は snd_pcm_mmap_status 型のメンバ
  • linux-2.6.33/snd_pcm_mmap_status

• linux-2.6.33/SNDRV_PCM_STATE_OPEN

		if (put_user(0, &_xferi->result))
			return -EFAULT;
		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
			return -EFAULT;

• • linux-2.6.33/put_user()

• linux-2.6.33/copy_from_user()

		result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
		__put_user(result, &_xferi->result);

• • linux-2.6.33/snd_pcm_lib_write()

• linux-2.6.33/__put_user()

		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
	{
		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
		void __user **bufs;
		snd_pcm_sframes_t result;

• • linux-2.6.33/SNDRV_PCM_IOCTL_WRITEN_FRAMES

• linux-2.6.33/snd_xfern

		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (runtime->channels > 128)
			return -EINVAL;
		if (put_user(0, &_xfern->result))
			return -EFAULT;
		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
			return -EFAULT;

		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);

• • linux-2.6.33/memdup_user()

• linux-2.6.33/IS_ERR()

• • linux-2.6.33/PTR_ERR()

		result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
		kfree(bufs);
		__put_user(result, &_xfern->result);

• • linux-2.6.33/snd_pcm_lib_writev()

• linux-2.6.33/kfree()

		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_REWIND:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;

• • linux-2.6.33/SNDRV_PCM_IOCTL_REWIND

• linux-2.6.33/snd_pcm_uframes_t

		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_playback_rewind(substream, frames);
		__put_user(result, _frames);

• • linux-2.6.33/snd_pcm_playback_rewind()

		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_FORWARD:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;

• • linux-2.6.33/SNDRV_PCM_IOCTL_FORWARD

		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_playback_forward(substream, frames);
		__put_user(result, _frames);

• • linux-2.6.33/snd_pcm_playback_forward()

		return result < 0 ? result : 0;
	}
	}
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);

• • linux-2.6.33/snd_pcm_common_ioctl1()

}

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