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/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*/
#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>
#include <getopt.h>
#define SIZE 8000
static int pass = 0;
static float best = 0.0;
static float worst = 100.0;
static double total = 0.0;
static double delay_total = 0.0;
void hup_handler(int sig)
{
printf("\n--- Results after %d passes ---\n", pass);
printf("Best: %.3f -- Worst: %.3f -- Average: %f, Difference: %f\n",
best, worst, pass ? total/pass : 100.00, pass ? delay_total/pass : 100);
exit(0);
}
static void usage(char *argv0)
{
char *c;
c = strrchr(argv0, '/');
if (!c)
c = argv0;
else
c++;
fprintf(stderr,
"Usage: %s [-c COUNT] [-v]\n"
" Valid options are:\n"
" -c COUNT Run just COUNT cycles (otherwise: forever).\n"
" -v More verbose output.\n"
" -h This help text.\n"
,c);
}
int main(int argc, char *argv[])
{
int fd;
int res;
int c;
int count=0;
int seconds = 0;
int curarg = 1;
int verbose=0;
char buf[8192];
float score;
float ms;
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((c = getopt(argc, argv, "c:hv")) != -1) {
switch(c) {
case 'c':
seconds = atoi(optarg);
break;
case 'h':
usage(argv[0]);
exit(0);
break;
case '?':
usage(argv[0]);
exit(1);
break;
case 'v':
verbose++;
break;
}
}
while(curarg < argc) {
if (!strcasecmp(argv[curarg], "-v"))
verbose++;
if (!strcasecmp(argv[curarg], "-c") && argc > curarg)
seconds = atoi(argv[curarg + 1]);
curarg++;
}
printf("Opened pseudo zap interface, measuring accuracy...\n");
signal(SIGHUP, hup_handler);
signal(SIGINT, hup_handler);
signal(SIGALRM, hup_handler);
/* Flush input buffer */
for (count = 0;count < 4; count++)
res = read(fd, buf, sizeof(buf));
count = 0;
ms = 0; /* Makes the compiler happy */
if (seconds > 0)
alarm(seconds + 1); /* This will give 'seconds' cycles */
for(;;) {
if (count == 0)
ms = 0;
gettimeofday(&start, NULL);
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;
gettimeofday(&now, NULL);
ms += (now.tv_sec - start.tv_sec) * 8000;
ms += (now.tv_usec - start.tv_usec) / 125.0;
if (count >= SIZE) {
double percent;
percent = 100.0 * (count - ms) / count;
if (verbose)
printf("\n%d zaptel samples in %0.3f system clock sample intervals (%.3f%%)",
count, ms, 100 - percent);
else if ((pass % 8) == 7) printf("\n");
score = 100.0 - fabs(percent);
if (score > best)
best = score;
if (score < worst)
worst = score;
if (!verbose)
printf("%f%% ", score);
total += score;
delay_total += 100 - percent;
fflush(stdout);
count = 0;
pass++;
}
}
}
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