1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
#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++;
}
}
}
|
