- WSANETWORKEVENTS network_events;
- if (WSAEnumNetworkEvents(io->fd, io->event, &network_events) != 0)
- return false;
- if (network_events.lNetworkEvents & WRITE_EVENTS)
- io->cb(io->data, IO_WRITE);
- if (network_events.lNetworkEvents & READ_EVENTS)
- io->cb(io->data, IO_READ);
+ if(io->fd == -1) {
+ io->cb(io->data, 0);
+ } else {
+ WSANETWORKEVENTS network_events;
+
+ if(WSAEnumNetworkEvents(io->fd, io->event, &network_events) != 0) {
+ return false;
+ }
+
+ if(network_events.lNetworkEvents & READ_EVENTS) {
+ io->cb(io->data, IO_READ);
+ }
+
+ /*
+ The fd might be available for write too. However, if we already fired the read callback, that
+ callback might have deleted the io (e.g. through terminate_connection()), so we can't fire the
+ write callback here. Instead, we loop back and let the writable io loop above handle it.
+ */
+ }