AUDIO_SETFD
retval = ioctl(fd, AUDIO_SETFD, &idat);
error = ioctlf(fp, AUDIO_SETFD, &idat);
case AUDIO_SETFD:
r = IOCTL(fd, AUDIO_SETFD, &n, "on");
r = IOCTL(fd, AUDIO_SETFD, &n, "off");
r = IOCTL(fd, AUDIO_SETFD, &n, "on");
r = IOCTL(fd, AUDIO_SETFD, &n, "off");
if (ioctl(fd, AUDIO_SETFD,