+int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
+ struct reply_callback *c;
+
+ if (!bus)
+ return -EINVAL;
+ if (!timeout_usec)
+ return -EINVAL;
+ if (bus->fd < 0)
+ return -ENOTCONN;
+
+ if (bus->state == BUS_AUTHENTICATING) {
+ *timeout_usec = bus->auth_timeout;
+ return 1;
+ }
+
+ if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO)
+ return 0;
+
+ c = prioq_peek(bus->reply_callbacks_prioq);
+ if (!c)
+ return 0;
+
+ *timeout_usec = c->timeout;
+ return 1;
+}
+
+static int process_timeout(sd_bus *bus) {
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ struct reply_callback *c;
+ usec_t n;
+ int r;
+
+ assert(bus);
+
+ c = prioq_peek(bus->reply_callbacks_prioq);
+ if (!c)
+ return 0;
+
+ n = now(CLOCK_MONOTONIC);
+ if (c->timeout > n)
+ return 0;
+
+ assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
+ hashmap_remove(bus->reply_callbacks, &c->serial);
+
+ r = c->callback(bus, ETIMEDOUT, NULL, c->userdata);
+ free(c);
+
+ return r < 0 ? r : 1;
+}
+
+static int process_builtin(sd_bus *bus, sd_bus_message *m) {
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ int r;
+
+ assert(bus);
+ assert(m);
+
+ if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+ return 0;
+
+ if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
+ return 0;
+
+ if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 1;
+
+ if (streq_ptr(m->member, "Ping"))
+ r = sd_bus_message_new_method_return(bus, m, &reply);
+ else if (streq_ptr(m->member, "GetMachineId")) {
+ sd_id128_t id;
+ char sid[33];
+
+ r = sd_id128_get_machine(&id);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_new_method_return(bus, m, &reply);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
+ } else {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_INIT;
+
+ sd_bus_error_set(&error,
+ "org.freedesktop.DBus.Error.UnknownMethod",
+ "Unknown method '%s' on interface '%s'.", m->member, m->interface);
+
+ r = sd_bus_message_new_method_error(bus, m, &error, &reply);
+ }
+
+ if (r < 0)
+ return r;
+
+ r = sd_bus_send(bus, reply, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int process_message(sd_bus *bus, sd_bus_message *m) {
+ struct filter_callback *l;
+ int r;
+
+ assert(bus);
+ assert(m);
+
+ if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN || m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) {
+ struct reply_callback *c;
+
+ c = hashmap_remove(bus->reply_callbacks, &m->reply_serial);
+ if (c) {
+ if (c->timeout != 0)
+ prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
+
+ r = c->callback(bus, 0, m, c->userdata);
+ free(c);
+
+ if (r != 0)
+ return r;
+ }
+ }
+
+ LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
+ r = l->callback(bus, 0, m, l->userdata);
+ if (r != 0)
+ return r;
+ }
+
+ return process_builtin(bus, m);
+}
+