comedi_command — start streaming input/output
#include <comedilib.h>
| int comedi_command( | comedi_t * device, | 
| comedi_cmd * command ); | 
The function comedi_command starts a streaming input
or output.  The
command structure pointed to by command specifies
settings for the
acquisition.  The command must be able to pass
comedi_command_test
with a return value of 0, or
comedi_command will fail.
For input subdevices, sample values are read using the
function read on the device file descriptor.
For output subdevices,
sample values are written using the function write.