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/*
* Written by Mark Spencer <markster@digium.com>
* Based on previous works, designs, and architectures conceived and
* written by Jim Dixon <jim@lambdatel.com>.
*
* Copyright (C) 2001 Jim Dixon / Zapata Telephony.
* Copyright (C) 2001-2008 Digium, Inc.
*
* All rights reserved.
*
* Primary Author: Mark Spencer <markster@digium.com>
* Radio Support by Jim Dixon <jim@lambdatel.com>
*/
/*
* 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>
#include "dahdi_tools_version.h"
#define SIZE 8000
static int verbose;
static int pass = 0;
static float best = 0.0;
static float worst = 100.0;
static double total = 0.0;
static double total_time = 0.0;
static double total_count = 0.0;
static inline float _fmin(float a, float b)
{
return (a < b) ? a : b;
}
static double calculate_accuracy(double count, double ms)
{
return ((count - _fmin(count, fabs(count - ms))) / count) * 100.0;
}
void hup_handler(int sig)
{
double accuracy = calculate_accuracy(total_count, total_time);
printf("\n--- Results after %d passes ---\n", pass);
printf("Best: %.3f%% -- Worst: %.3f%% -- Average: %f%%\n",
best, worst, pass ? total/pass : 100.00);
printf("Cummulative Accuracy (not per pass): %0.3f\n",
pass ? accuracy : 0.0);
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;
char buf[8192];
float ms;
struct timeval start, now;
fd = open("/dev/dahdi/pseudo", O_RDWR);
if (fd < 0) {
fprintf(stderr, "Unable to open dahdi 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 dahdi 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) {
const double percent = calculate_accuracy(count, ms);
if (verbose) {
printf("\n%d samples in %0.3f system clock sample intervals (%.3f%%)",
count, ms, percent);
} else if (pass > 0 && (pass % 8) == 0) {
printf("\n");
}
if (percent > best)
best = percent;
if (percent < worst)
worst = percent;
if (!verbose)
printf("%.3f%% ", percent);
total += percent;
fflush(stdout);
total_count += count;
total_time += ms;
count = 0;
pass++;
}
}
}
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