+static void handle_meta_io(void *data, int flags) {
+ connection_t *c = data;
+
+ if(c->status.connecting) {
+ /*
+ The event loop does not protect against spurious events. Verify that we are actually connected
+ by issuing an empty send() call.
+
+ Note that the behavior of send() on potentially unconnected sockets differ between platforms:
+ +------------+-----------+-------------+-----------+
+ | Event | POSIX | Linux | Windows |
+ +------------+-----------+-------------+-----------+
+ | Spurious | ENOTCONN | EWOULDBLOCK | ENOTCONN |
+ | Failed | ENOTCONN | (cause) | ENOTCONN |
+ | Successful | (success) | (success) | (success) |
+ +------------+-----------+-------------+-----------+
+ */
+ if(send(c->socket, NULL, 0, 0) != 0) {
+ if(sockwouldblock(sockerrno)) {
+ return;
+ }
+
+ int socket_error;
+
+ if(!socknotconn(sockerrno)) {
+ socket_error = sockerrno;
+ } else {
+ socklen_t len = sizeof(socket_error);
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&socket_error, &len);
+ }
+
+ if(socket_error) {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(socket_error));
+ terminate_connection(c, false);
+ }
+
+ return;
+ }
+
+ c->status.connecting = false;
+ finish_connecting(c);