/* Like poll(), except:
*
* - On error, returns a negative error code (instead of setting errno).
*
* - If interrupted by a signal, retries automatically until the original
* 'timeout' expires. (Because of this property, this function will
* never return -EINTR.)
*
* - As a side effect, refreshes the current time (like time_refresh()).
*/
int
time_poll(struct pollfd *pollfds, int n_pollfds, long long int timeout_when, int * elapsed)
{
long long int start;
sigset_t oldsigs;
bool blocked;
int retval;
time_refresh();
start = time_msec();
blocked = false;
for (;;) {
long long int now = time_msec();
int time_left;
if (now >= timeout_when) {
time_left = 0;
printf("time_left: 0\n");
} else if ((unsigned long long int) timeout_when - now > INT_MAX) {
time_left = INT_MAX;
printf("time_left: INT_MAX\n");
} else {
time_left = timeout_when - now;
printf("time_left: %d\n", time_left);
}
retval = poll(pollfds, n_pollfds, time_left);
printf("time_poll -> return from poll: %d\n", retval);
if (retval < 0) {
retval = -errno;
perror("time_poll");
}
if (retval != -EINTR) {
break;
}
if (!blocked && deadline == TIME_MIN) {
// block_sigalrm(&oldsigs);
blocked = true;
}
time_refresh();
}
if (blocked) {
// unblock_sigalrm(&oldsigs);
}
return retval;
}
static void
refresh_if_ticked(void)
{
assert(inited);
if (tick) {
time_refresh();
}
}
/* Like poll(), except:
*
* - On error, returns a negative error code (instead of setting errno).
*
* - If interrupted by a signal, retries automatically until the original
* 'timeout' expires. (Because of this property, this function will
* never return -EINTR.)
*
* - As a side effect, refreshes the current time (like time_refresh()).
*/
int
time_poll(struct pollfd *pollfds, int n_pollfds, int timeout)
{
long long int start;
sigset_t oldsigs;
bool blocked;
int retval;
time_refresh();
start = time_msec();
blocked = false;
for (;;) {
int time_left;
if (timeout > 0) {
long long int elapsed = time_msec() - start;
time_left = timeout >= elapsed ? timeout - elapsed : 0;
} else {
time_left = timeout;
}
retval = poll(pollfds, n_pollfds, time_left);
if (retval < 0) {
retval = -errno;
}
if (retval != -EINTR) {
break;
}
if (!blocked && deadline == TIME_MIN) {
block_sigalrm(&oldsigs);
blocked = true;
}
time_refresh();
}
if (blocked) {
unblock_sigalrm(&oldsigs);
}
return retval;
}
