comedi_get_buffer_contents — streaming buffer status
|comedi_t * device,|
|unsigned int subdevice|
comedi_get_buffer_contents is used on a subdevice
that has a Comedi command in progress to get the number of unread bytes. For
a streaming input command, this is the number of bytes that can be read. For
a streaming output command, subtracting this from the buffer size gives the
space available to be written.