Once you have the comedi library installed, the command to compile comedi programs using gcc/linux is
$gcc -Wall -O2 <program_name>.c -lcomedi -lm
Sample program :
#include <stdio.h> /* for printf() */
#include <comedilib.h>
int subdev = 0; /* change this to your input subdevice */
int chan = 0; /* change this to your channel */
int range = 0; /* more on this later */
int aref = AREF_GROUND; /* more on this later */
int main(int argc,char *argv[])
{
comedi_t *it;
lsampl_t data;
it=comedi_open("/dev/comedi0");
comedi_data_read(it,subdev,chan,range,aref, & data);
printf("%d\n",data);
return 0;
}