comedi_mark_buffer_read — streaming buffer control
#include <comedilib.h>
int comedi_mark_buffer_read( | comedi_t * device, |
| unsigned int subdevice, | |
unsigned int num_bytes); |
The function comedi_mark_buffer_read is used on a subdevice
that has a Comedi input command in progress. It should only be used
if you are using a mmap mapping to read data from Comedi's buffer
(as opposed to calling read on the device file
descriptor),
since Comedi will automatically keep track of how many bytes have been
transferred via read calls. This function is
used to indicate that the next num_bytes
bytes in the buffer
are no longer needed and may be discarded.