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Sourcecode: zaptel version File versions

zttest.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <math.h>

#define SIZE 8000

static int pass = 0;
static float best = 0.0;
static float worst = 100.0;

void hup_handler(int sig)
{
      printf("\n--- Results after %d passes ---\n", pass);
      printf("Best: %f -- Worst: %f\n", best, worst);
      exit(0);
}

int main(int argc, char *argv[])
{
      int fd;
      int res;
      int count=0;
      int ms;
      int curarg = 1;
      int verbose=0;
      char buf[8192];
      float score;
      struct timeval start, now;
      fd = open("/dev/zap/pseudo", O_RDWR);
      if (fd < 0) {
            fprintf(stderr, "Unable to open zap interface: %s\n", strerror(errno));
            exit(1);
      }
      while(curarg < argc) {
            if (!strcasecmp(argv[curarg], "-v"))
                  verbose++;
            curarg++;
      }
      printf("Opened pseudo zap interface, measuring accuracy...\n");
      signal(SIGHUP, hup_handler);
      signal(SIGINT, hup_handler);
      /* Flush input buffer */
      for (count = 0;count < 4; count++)
            res = read(fd, buf, sizeof(buf));
      count = 0;
      gettimeofday(&start, NULL);
      for(;;) {
            res = read(fd, buf, sizeof(buf));
            if (res < 0) {
                  fprintf(stderr, "Failed to read from pseudo interface: %s\n", strerror(errno));
                  exit(1);
            }
            count += res;
            if (count >= SIZE) {
                  gettimeofday(&now, NULL);
                  ms = (now.tv_sec - start.tv_sec) * 8000;
                  ms += (now.tv_usec - start.tv_usec) / 125;
                  start = now;
                  if (verbose)
                        printf("\n%d samples in %d sample intervals ", count, ms);
                  else if ((pass % 8) == 7) printf("\n");
                  score = 100.0 - 100.0 * fabs((float)count - (float)ms) / (float)count;
                  if (score > best)
                        best = score;
                  if (score < worst)
                        worst = score;
                  printf("%f%% ", score);
                  fflush(stdout);
                  count = 0;
                  pass++;
            }
      }
}

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