snd_seq_queue_client
#define SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT _IOWR('S', 0x49, struct snd_seq_queue_client)
#define SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT _IOW ('S', 0x4a, struct snd_seq_queue_client)
struct snd_seq_queue_client *info = arg;
struct snd_seq_queue_client *info = arg;
struct snd_seq_queue_client queue_client;