static void check_timespec_diff(void)
{
unsigned long long diff;
struct timespec start, end;
timespec_set(start, 1, 30000);
timespec_set(end, start.tv_sec, start.tv_nsec + 10000);
timespec_diff(start, end, &diff);
printf("Checking 10000 == %llu\n", diff);
if (diff != 10000) {
printf("Failure!\n");
exit(FAIL);
}
timespec_set(end, start.tv_sec + 5, start.tv_nsec - 5000);
timespec_diff(start, end, &diff);
printf("Checking 4999995000 == %llu\n", diff);
if (diff != 4999995000llu) {
printf("Failure!\n");
exit(FAIL);
}
}
header make_header()
{
//you can customize header here
header rs;
//timestamp
timespec dr,now;
timespec_set(&dr,duration_);
clock_gettime(CLOCK_REALTIME,&now);
timer_add(&now,&dr,&rs.timestamp);
//quantum
rs.quantum = 1;
//make ehternet header
static uint32_t dst = 0;
static uint32_t src = UINT32_MAX-1;
rs.eth = new sniff_ethernet;
sniff_ethernet *eth = rs.eth;
uint32_t *mac_dst = (uint32_t *)(eth->ether_dhost + 2);
uint32_t *mac_src = (uint32_t *)(eth->ether_shost + 2);
*mac_dst = htonl(dst);
*mac_src = htonl(src);
eth->ether_dhost[2] = 0x0c;
eth->ether_shost[0] = 0x00;
eth->ether_shost[1] = 0x02;
eth->ether_shost[2] = 0xb3;
//make ip header
rs.ip = new sniff_ip;
rs.ip->ip_src.s_addr = htonl(src);
rs.ip->ip_dst.s_addr = htonl(dst/2);
//make tcp header
rs.tcp = new sniff_tcp;
rs.tcp->th_dport = htons(10071);
rs.tcp->th_sport = htons(10087);
--src;
++dst;
return rs;
}
int timeout_set(const double seconds)
{
struct timespec now, then;
struct itimerspec when;
double next;
int timeout, i;
/* Timeout must be in the future. */
if (seconds <= 0.0)
return -1;
/* Get current time, */
if (clock_gettime(CLOCK_REALTIME, &now))
return -1;
/* and calculate when the timeout should fire. */
then = now;
timespec_add(&then, seconds);
/* Find an unused timeout. */
for (timeout = 0; timeout < TIMEOUTS; timeout++)
if (!(__sync_fetch_and_or(&timeout_state[timeout], TIMEOUT_USED) & TIMEOUT_USED))
break;
/* No unused timeouts? */
if (timeout >= TIMEOUTS)
return -1;
/* Clear all but TIMEOUT_USED from the state, */
__sync_and_and_fetch(&timeout_state[timeout], TIMEOUT_USED);
/* update the timeout details, */
timeout_time[timeout] = then;
/* and mark the timeout armable. */
__sync_or_and_fetch(&timeout_state[timeout], TIMEOUT_ARMED);
/* How long till the next timeout? */
next = seconds;
for (i = 0; i < TIMEOUTS; i++)
if ((__sync_fetch_and_or(&timeout_state[i], 0) & (TIMEOUT_USED | TIMEOUT_ARMED | TIMEOUT_PASSED)) == (TIMEOUT_USED | TIMEOUT_ARMED)) {
const double secs = timespec_diff(timeout_time[i], now);
if (secs >= 0.0 && secs < next)
next = secs;
}
/* Calculate duration when to fire the timeout next, */
timespec_set(&when.it_value, next);
when.it_interval.tv_sec = 0;
when.it_interval.tv_nsec = 0L;
/* and arm the timer. */
if (timer_settime(timeout_timer, 0, &when, NULL)) {
/* Failed. */
__sync_and_and_fetch(&timeout_state[timeout], 0);
return -1;
}
/* Return the timeout number. */
return timeout;
}
