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#include <camellia.h>
#include <camellia/syscalls.h>
#include <err.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
uint64_t
gettime_ascii(hid_t h)
{
char buf[32];
_sys_read(h, buf, 32, 0);
return strtol(buf, NULL, 10);
}
uint64_t
gettime_binary(hid_t h)
{
uint64_t t;
_sys_read(h, &t, 8, 0);
return t;
}
uint64_t
gettime_syscall(hid_t)
{
return _sys_time(0);
}
void
usage(int ret)
{
fprintf(stderr,
"usage: timebench [-a file | -b file | -s]\n"
" e.g. timebench -a /dev/ntp\n"
" timebench -b /dev/bintime\n"
" timebench -s\n"
);
exit(ret);
}
int
main(int argc, char *argv[])
{
uint64_t (*fn)(hid_t) = NULL;
hid_t h = -1;
int opt;
while ((opt = getopt(argc, argv, "abs")) != -1) {
switch (opt) {
case 'a':
if (fn) usage(1);
fn = gettime_ascii;
break;
case 'b':
if (fn) usage(1);
fn = gettime_binary;
break;
case 's':
if (fn) usage(1);
fn = gettime_syscall;
break;
default:
usage(1);
}
}
if (fn == NULL) {
usage(1);
} else if (fn == gettime_syscall) {
if (optind < argc) {
usage(1);
}
} else {
if (optind + 1 != argc) {
usage(1);
}
h = camellia_open(argv[optind], OPEN_READ);
if (h < 0) {
err(1, "open %s", argv[optind]);
}
}
uint64_t target = 5000l * 1000000l;
uint64_t start;
uint64_t count = 0;
uint64_t last;
start = fn(h);
target += start;
for (;;) {
last = fn(h);
count++;
if (last >= target) break;
}
printf("%lu calls in %lums\n", count, (last-start) / 1000000);
printf("%luμs per call\n", (last-start) / count);
printf("last %lu\n", last);
}
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