_OSS_IOWR
#define OSS_MIXER_WRITE_R(dev) _OSS_IOWR('M', dev, int)
#define OSS_SYNTH_INFO _OSS_IOWR('Q', 2, struct oss_synth_info)
#define OSS_SEQ_CTRLRATE _OSS_IOWR('Q', 3, int)
#define OSS_MIDI_INFO _OSS_IOWR('Q',12, struct oss_midi_info)
#define OSS_MEMAVL _OSS_IOWR('Q',14, int)
#define OSS_ID _OSS_IOWR('Q',20, struct oss_synth_info)
#define OSS_CONTROL _OSS_IOWR('Q',21, struct oss_synth_control)
#define OSS_REMOVESAMPLE _OSS_IOWR('Q',22, struct oss_remove_sample)
#define OSS_TMR_TIMEBASE _OSS_IOWR('T', 1, int)
#define OSS_TMR_TEMPO _OSS_IOWR('T', 5, int)
#define OSS_TMR_SOURCE _OSS_IOWR('T', 6, int)
#define OSS_SNDCTL_DSP_SPEED _OSS_IOWR('P', 2, int)
#define OSS_SNDCTL_DSP_STEREO _OSS_IOWR('P', 3, int)
#define OSS_SNDCTL_DSP_GETBLKSIZE _OSS_IOWR('P', 4, int)
#define OSS_SNDCTL_DSP_SETFMT _OSS_IOWR('P', 5, int)
#define OSS_SNDCTL_DSP_CHANNELS _OSS_IOWR('P', 6, int)
#define OSS_SOUND_PCM_WRITE_FILTER _OSS_IOWR('P', 7, int)
#define OSS_SNDCTL_DSP_SUBDIVIDE _OSS_IOWR('P', 9, int)
#define OSS_SNDCTL_DSP_SETFRAGMENT _OSS_IOWR('P', 10, int)