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typedef struct

{

  u32_t      handle;

  u32_t      io_code;

  void       *input;

  int        inp_size;

  void       *output;

  int        out_size;

}ioctl_t;

typedef struct

{

    u32_t code;

    union

    {

        struct                          /* window event    */

        {

            u32_t   win;                /* window handle   */

            u32_t   val1;

            u32_t   val2;

            u16_t   x;                  /* cursor x        */

            u16_t   y;                  /* cursor y        */

            u32_t   unused;

        }__attribute__ ((packed));

        struct                          /* realtime io     */

        {

            u32_t   sender;             /* service handler */

            u32_t   stream;             /* io stream id, if present  */

            addr_t  offset;

            size_t  size;

        };

        struct                          /* ipc event       */

        {

            u32_t   sender;

            u32_t   io_code;

            addr_t *input;

            size_t  inp_size;

            addr_t *output;

            size_t  out_size;

        };

    };

}event_t;