SNDRV_PCM_IOCTL_READN_FRAMES 603 include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_READN_FRAMES _IOR('A', 0x53, struct snd_xfern) SNDRV_PCM_IOCTL_READN_FRAMES 603 tools/include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_READN_FRAMES _IOR('A', 0x53, struct snd_xfern)