/*
Gary Russell (ISSW)
ghrussell@yahoo.com
https://russellman128.angelfire.com/
Date:
This is timeout function. Use a file (Timer.lock)
as test.
*/
#include <iostream>
#include <ctime>        ///Time functions.
#include <sys/stat.h>   ///stat struct.

using namespace std;

///Timmer.
void timmer() {

   ///trigger; The bigger the number the slower.
   int msec = 0, trigger = 10000; //ms.
   ///The clock() function returns the
   /// processor time since the program started.
   ///clock_t == clock tick counts. Stored in before.
   clock_t before = clock();

   ///loop.
   do {
      ///Get current ticks - before ticks.
      clock_t difference = clock() - before;
      ///msec, in this case, is about a second.
      msec = difference * 10000 / CLOCKS_PER_SEC;
   ///When the msec (1 second) == trigger. exit loop.
   }while(msec < trigger);
}
/// /////////////////////////
///Does the filelock file exist? 0.134s
inline int fileexist(char *name) {
///stat is a struct that hold file info.
struct stat buffer;

///Return 0 if exist.
///The stat() function obtain
/// information about the named file.
return(stat(name,&buffer));
}
/// /////////////////////////

int main(int argc, char *argv[]) {
int exist = 0; ///Does exist.

   ///Loop 4 times.
   for(int x=0;x<4;x++) {
      ///If not 0 file does not exist. break;
      if(fileexist((char *)"Timer.lock")!=0) {
         exist = 1; break;
      }
      timmer();
   }

   ///If file stell exist, exit main() (presses).
   if(exist == 0) {
      cout << "\nTimeout: File exist!\n"; return 1;
   }

   cout << "\nFile does not exist!\n";

return 0;
}