comedi_get_buffer_contents man page

comedi_get_buffer_contents — streaming buffer status

Synopsis

#include <comedilib.h>

int comedi_get_buffer_contents(comedi_t * device, unsigned int subdevice);

Description

The function 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.

Return Value

On success, comedi_get_buffer_contents returns the number of unread bytes in the buffer. On failure, -1 is returned.

Authors

David Schleef <ds@schleef.org>

Author.

Frank Mori Hess <fmhess@users.sourceforge.net>

Author.

Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>

Author.

Bernd Porr <tech@linux-usb-daq.co.uk>

Author.

Ian Abbott <abbotti@mev.co.uk>

Author.

Éric Piel <piel@delmic.com>

Author.

Info

05/11/2017 Comedi reference