- ioctl AUDIO_GETFD/SETFD, AUDIO_GETCHAN/SETCHAN are obsoleted. ossaudio is still using this, although I don't know if it's critical. compat/ossaudio/ossaudio.c:779 case OSS_SNDCTL_DSP_SETDUPLEX: idat = 1; error = ioctlf(fp, AUDIO_SETFD, &idat);