System Trap - Read a sequence of bytes from a device object into the caller's
kern_return_t device_read_overwrite_async
(mach_port_t device,
mach_port_t queue,
mach_port_t request_id,
dev_mode_t mode,
recnum_t recnum,
io_buf_len_t bytes_wanted,
io_buf_ptr_t buffer);
The device_read_overwrite system trap enqueues a read operation for a sequence of bytes from a device object to be placed directly into the caller's address space. The meaning of recnum as well as the specific operation performed is device dependent.
device_read_overwrite_async returns only invalid parameter errors.
Functions: device_read_async, device_read_async_inband, device_write_async, device_write_async_inband, io_done_queue_create.