audio_buf_info
#define SNDCTL_DSP_GETOSPACE _SIOR ('P',12, audio_buf_info)
#define SNDCTL_DSP_GETISPACE _SIOR ('P',13, audio_buf_info)
static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
struct audio_buf_info info;
(struct audio_buf_info __user *) arg);
audio_buf_info info;