void process_iod_events(struct npool *nsp, struct niod *nsi, int ev) {
int i = 0;
/* store addresses of the pointers to the first elements of each kind instead
* of storing the values, as a connect can add a read for instance */
gh_lnode_t **start_elems[] = {
&nsi->first_connect,
&nsi->first_read,
&nsi->first_write,
#if HAVE_PCAP
&nsi->first_pcap_read,
#endif
NULL
};
gh_list_t *evlists[] = {
&nsp->connect_events,
&nsp->read_events,
&nsp->write_events,
#if HAVE_PCAP
&nsp->pcap_read_events,
#endif
NULL
};
assert(nsp == nsi->nsp);
nsock_log_debug_all("Processing events on IOD %lu (ev=%d)", nsi->id, ev);
/* We keep the events separate because we want to handle them in the
* order: connect => read => write => timer for several reasons:
*
* 1) Makes sure we have gone through all the net i/o events before
* a timer expires (would be a shame to timeout after the data was
* available but before we delivered the events
*
* 2) The connect() results often lead to a read or write that can be
* processed in the same cycle. In the same way, read() often
* leads to write().
*/
for (i = 0; evlists[i] != NULL; i++) {
gh_lnode_t *current, *next, *last;
/* for each list, get the last event and don't look past it as an event
* could add another event in the same list and so on... */
last = gh_list_last_elem(evlists[i]);
for (current = *start_elems[i];
current != NULL && gh_lnode_prev(current) != last;
current = next) {
struct nevent *nse;
#if HAVE_PCAP
if (evlists[i] == &nsi->nsp->pcap_read_events)
nse = lnode_nevent2(current);
else
#endif
nse = lnode_nevent(current);
/* events are grouped by IOD. Break if we're done with the events for the
* current IOD */
if (nse->iod != nsi)
break;
process_event(nsp, evlists[i], nse, ev);
next = gh_lnode_next(current);
if (nse->event_done) {
/* event is done, remove it from the event list and update IOD pointers
* to the first events of each kind */
update_first_events(nse);
gh_list_remove(evlists[i], current);
gh_list_append(&nsp->free_events, &nse->nodeq_io);
if (nse->timeout.tv_sec)
gh_heap_remove(&nsp->expirables, &nse->expire);
}
}
}
}
/* An internal function for cancelling an event when you already have a pointer
* to the msevent (use nsock_event_cancel if you just have an ID). The
* event_list passed in should correspond to the type of the event. For example,
* with NSE_TYPE_READ, you would pass in &nsp->read_events;. elem is the list
* element in event_list which holds the event. Pass a nonzero for notify if
* you want the program owning the event to be notified that it has been
* cancelled */
int msevent_cancel(mspool *nsp, msevent *nse, gh_list_t *event_list,
gh_lnode_t *elem, int notify) {
if (nse->event_done) {
/* This event has already been marked for death somewhere else -- it will be
* gone soon (and if we try to kill it now all hell will break loose due to
* reentrancy. */
return 0;
}
nsock_log_info(nsp, "msevent_cancel on event #%li (type %s)",
nse->id, nse_type2str(nse->type));
/* Now that we found the event... we go through the motions of cleanly
* cancelling it */
switch (nse->type) {
case NSE_TYPE_CONNECT:
case NSE_TYPE_CONNECT_SSL:
handle_connect_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
case NSE_TYPE_READ:
handle_read_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
case NSE_TYPE_WRITE:
handle_write_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
case NSE_TYPE_TIMER:
handle_timer_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
#if HAVE_PCAP
case NSE_TYPE_PCAP_READ:
handle_pcap_read_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
#endif
default:
fatal("Invalid nsock event type (%d)", nse->type);
}
assert(nse->event_done);
if (nse->timeout.tv_sec)
gh_heap_remove(&nsp->expirables, &nse->expire);
if (event_list) {
update_first_events(nse);
gh_list_remove(event_list, elem);
}
gh_list_append(&nsp->free_events, &nse->nodeq_io);
nsock_log_debug_all(nsp, "NSE #%lu: Removing event from list", nse->id);
#if HAVE_PCAP
#if PCAP_BSD_SELECT_HACK
if (nse->type == NSE_TYPE_PCAP_READ) {
nsock_log_debug_all(nsp, "PCAP NSE #%lu: CANCEL TEST pcap=%p read=%p curr=%p sd=%i",
nse->id, &nsp->pcap_read_events, &nsp->read_events,
event_list,((mspcap *)nse->iod->pcap)->pcap_desc);
/* If event occurred, and we're in BSD_HACK mode, then this event was added to
* two queues. read_event and pcap_read_event Of course we should
* destroy it only once. I assume we're now in read_event, so just unlink
* this event from pcap_read_event */
if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0 && event_list == &nsp->read_events) {
/* event is done, list is read_events and we're in BSD_HACK mode. So unlink
* event from pcap_read_events */
gh_list_remove(&nsp->pcap_read_events, &nse->nodeq_pcap);
nsock_log_debug_all(nsp, "PCAP NSE #%lu: Removing event from PCAP_READ_EVENTS", nse->id);
}
if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0 && event_list == &nsp->pcap_read_events) {
/* event is done, list is read_events and we're in BSD_HACK mode.
* So unlink event from read_events */
gh_list_remove(&nsp->read_events, &nse->nodeq_io);
nsock_log_debug_all(nsp, "PCAP NSE #%lu: Removing event from READ_EVENTS", nse->id);
}
}
#endif
#endif
msevent_dispatch_and_delete(nsp, nse, notify);
return 1;
}
