snd_pcm_sync_ptr 424 include/sound/asound.h struct snd_pcm_sync_ptr { snd_pcm_sync_ptr 466 include/sound/asound.h SNDRV_PCM_IOCTL_SYNC_PTR = _IOWR('A', 0x23, struct snd_pcm_sync_ptr), snd_pcm_sync_ptr 2442 sound/core/pcm_native.c static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,