snd_seq_system_info 638 include/sound/asequencer.h #define SNDRV_SEQ_IOCTL_SYSTEM_INFO _IOWR('S', 0x02, struct snd_seq_system_info) snd_seq_system_info 1112 sound/core/seq/seq_clientmgr.c struct snd_seq_system_info info;