main.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>

int main( int argc, char* argv[] ) {
  int a;
  struct timeval starttv, endtv;
  time_t totalsec, totalusec, startsec, startusec;
  double pps, totaltime;

  if (argc < 2) {
    a = 0;
  }
  else {
    a = (long)strtol(argv[1], (char **)NULL, 10);
  }

  if (argc >= 4) {
    startsec = (long)strtol(argv[2], (char **)NULL, 10);
    startusec = (long)strtol(argv[3], (char **)NULL, 10);
  }
  else {
    gettimeofday(&starttv, NULL);
    startsec = starttv.tv_sec;
    startusec = starttv.tv_usec;
  }

  a++;

  gettimeofday(&endtv, NULL);
  totalsec = endtv.tv_sec - startsec;
  totalusec = endtv.tv_usec - startusec;
  totaltime = (double)(totalsec)+((double)totalusec/1000000.0);
  if (totaltime > 0) {
    pps = (double)a/totaltime;
  }
  printf("%f\n", pps);

  char* astr = (char*)malloc(sizeof(char)*256);
  sprintf(astr, "%d", a);
  char* tstr = (char*)malloc(sizeof(char)*256);
  sprintf(tstr, "%ld", startsec);
  char* tustr = (char*)malloc(sizeof(char)*256);
  sprintf(tustr, "%ld", startusec);

  //setsid();
  int id = fork();

  if (id == 0) {
    execlp("unixfun", "unixfun", astr, tstr, tustr, NULL);
  }

  return 0;
}