SNDCTL_DSP_NONBLOCK 694 fs/compat_ioctl.c COMPATIBLE_IOCTL(SNDCTL_DSP_NONBLOCK) SNDCTL_DSP_NONBLOCK 682 include/uapi/linux/soundcard.h #define SOUND_PCM_NONBLOCK SNDCTL_DSP_NONBLOCK SNDCTL_DSP_NONBLOCK 2664 sound/core/oss/pcm_oss.c case SNDCTL_DSP_NONBLOCK: