comedi_get_buffer_write_offset — streaming buffer write offset
|comedi_t * device,|
|unsigned int subdevice|
comedi_get_buffer_write_offset is used on
a subdevice that has a Comedi command in progress to get the current write
position in the streaming buffer as an offset in bytes from the start of
the buffer. The position will wrap around to 0 when it reaches the buffer
size. This offset is only useful for memory mapped buffers.