SNDCTL_DSP_MAPOUTBUF  690 include/uapi/linux/soundcard.h #define SOUND_PCM_MAPOUTBUF		SNDCTL_DSP_MAPOUTBUF
SNDCTL_DSP_MAPOUTBUF 2687 sound/core/oss/pcm_oss.c 	case SNDCTL_DSP_MAPOUTBUF: