audio_buf_info
audio_buf_info info;
sndctl_dsp_getospace(audio_client_t *c, audio_buf_info *bi)
sndctl_dsp_getispace(audio_client_t *c, audio_buf_info *bi)
rv = sndctl_dsp_getospace(c, (audio_buf_info *)data);
rv = sndctl_dsp_getispace(c, (audio_buf_info *)data);
#define SNDCTL_DSP_GETOSPACE __OSSIOR('P', 12, audio_buf_info)
#define SNDCTL_DSP_GETISPACE __OSSIOR('P', 13, audio_buf_info)