SOUND_MIXER_MONITOR 2240 fs/compat_ioctl.c COMPATIBLE_IOCTL(MIXER_READ(SOUND_MIXER_MONITOR)) SOUND_MIXER_MONITOR 2273 fs/compat_ioctl.c COMPATIBLE_IOCTL(MIXER_WRITE(SOUND_MIXER_MONITOR)) SOUND_MIXER_MONITOR 851 include/linux/soundcard.h #define SOUND_MASK_MONITOR (1 << SOUND_MIXER_MONITOR) SOUND_MIXER_MONITOR 1269 sound/core/oss/mixer_oss.c { SOUND_MIXER_MONITOR, "Monitor", 0 }