Running a py file from a button

component positions;

pin in float xposition              "Receives current position from Xpos";
pin in float yposition              "Receives current position from Ypos";
pin in float zposition              "Receives current position from Zpos";
pin in float uposition              "Receives current position from Upos";
pin in float vposition              "Receives current position from Vpos";
pin in float wposition              "Receives current position from Wpos";
pin in float aposition              "Receives current position from Apos";
pin in float bposition              "Receives current position from Bpos";
pin in float cposition              "Receives current position from Cpos";

pin in bit trigger = 0                "connected to the button";

option singleton yes;               
option userspace yes;

author "ArcEye";
license "GPL";
;;

#include <stdio.h>    /* Standard input/output definitions */
#include <stdlib.h> 
#include <stdint.h>   /* Standard types */
#include <string.h>   /* String function definitions */
#include <unistd.h>   /* UNIX standard function definitions */
#include <fcntl.h>    /* File control definitions */
#include <errno.h>    /* Error number definitions */
#include <signal.h>
int done = 0;


void adios(int sig)
{
    done = 1;
}


void user_mainloop(void)
{
char buff[256];
int triggered = 0;

    signal(SIGINT, adios);
    signal(SIGTERM, adios);
    bzero(buff,256);
    while(!done)
        {
        usleep(250000);
        
        FOR_ALL_INSTS()  
            { 
            if(trigger && !triggered)
                {
                sprintf(buff, "mypyprogram X%08.03f Y%08.03f Z%08.03f U%08.03f V%08.03f W%08.03f A%08.03f B%08.03f C%08.03f", 
                        xposition, yposition, zposition , uposition, vposition, wposition , aposition, bposition, cposition);
                system(buff);
                bzero(buff,256);
                triggered = 1;  // prevent further activations until button released
                }
            else if(!trigger && triggered)
                {
                triggered = 0;
                }
            }           
        }

    exit(0);
}