arm: Add has-mpu property
[qemu.git] / qdev-monitor.c
blob7dd62dd094be352ddce7b16f60235690b5a52053
1 /*
2 * Dynamic device configuration and creation.
4 * Copyright (c) 2009 CodeSourcery
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 #include "hw/qdev.h"
21 #include "hw/sysbus.h"
22 #include "monitor/monitor.h"
23 #include "monitor/qdev.h"
24 #include "qmp-commands.h"
25 #include "sysemu/arch_init.h"
26 #include "qemu/config-file.h"
29 * Aliases were a bad idea from the start. Let's keep them
30 * from spreading further.
32 typedef struct QDevAlias
34 const char *typename;
35 const char *alias;
36 uint32_t arch_mask;
37 } QDevAlias;
39 static const QDevAlias qdev_alias_table[] = {
40 { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
41 { "virtio-net-pci", "virtio-net", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
42 { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
43 { "virtio-balloon-pci", "virtio-balloon",
44 QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
45 { "virtio-blk-s390", "virtio-blk", QEMU_ARCH_S390X },
46 { "virtio-net-s390", "virtio-net", QEMU_ARCH_S390X },
47 { "virtio-serial-s390", "virtio-serial", QEMU_ARCH_S390X },
48 { "lsi53c895a", "lsi" },
49 { "ich9-ahci", "ahci" },
50 { "kvm-pci-assign", "pci-assign" },
51 { }
54 static const char *qdev_class_get_alias(DeviceClass *dc)
56 const char *typename = object_class_get_name(OBJECT_CLASS(dc));
57 int i;
59 for (i = 0; qdev_alias_table[i].typename; i++) {
60 if (qdev_alias_table[i].arch_mask &&
61 !(qdev_alias_table[i].arch_mask & arch_type)) {
62 continue;
65 if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
66 return qdev_alias_table[i].alias;
70 return NULL;
73 static bool qdev_class_has_alias(DeviceClass *dc)
75 return (qdev_class_get_alias(dc) != NULL);
78 static void qdev_print_devinfo(DeviceClass *dc)
80 error_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
81 if (dc->bus_type) {
82 error_printf(", bus %s", dc->bus_type);
84 if (qdev_class_has_alias(dc)) {
85 error_printf(", alias \"%s\"", qdev_class_get_alias(dc));
87 if (dc->desc) {
88 error_printf(", desc \"%s\"", dc->desc);
90 if (dc->cannot_instantiate_with_device_add_yet) {
91 error_printf(", no-user");
93 error_printf("\n");
96 static gint devinfo_cmp(gconstpointer a, gconstpointer b)
98 return strcasecmp(object_class_get_name((ObjectClass *)a),
99 object_class_get_name((ObjectClass *)b));
102 static void qdev_print_devinfos(bool show_no_user)
104 static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
105 [DEVICE_CATEGORY_BRIDGE] = "Controller/Bridge/Hub",
106 [DEVICE_CATEGORY_USB] = "USB",
107 [DEVICE_CATEGORY_STORAGE] = "Storage",
108 [DEVICE_CATEGORY_NETWORK] = "Network",
109 [DEVICE_CATEGORY_INPUT] = "Input",
110 [DEVICE_CATEGORY_DISPLAY] = "Display",
111 [DEVICE_CATEGORY_SOUND] = "Sound",
112 [DEVICE_CATEGORY_MISC] = "Misc",
113 [DEVICE_CATEGORY_MAX] = "Uncategorized",
115 GSList *list, *elt;
116 int i;
117 bool cat_printed;
119 list = g_slist_sort(object_class_get_list(TYPE_DEVICE, false),
120 devinfo_cmp);
122 for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
123 cat_printed = false;
124 for (elt = list; elt; elt = elt->next) {
125 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
126 TYPE_DEVICE);
127 if ((i < DEVICE_CATEGORY_MAX
128 ? !test_bit(i, dc->categories)
129 : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
130 || (!show_no_user
131 && dc->cannot_instantiate_with_device_add_yet)) {
132 continue;
134 if (!cat_printed) {
135 error_printf("%s%s devices:\n", i ? "\n" : "",
136 cat_name[i]);
137 cat_printed = true;
139 qdev_print_devinfo(dc);
143 g_slist_free(list);
146 static int set_property(void *opaque, const char *name, const char *value,
147 Error **errp)
149 Object *obj = opaque;
150 Error *err = NULL;
152 if (strcmp(name, "driver") == 0)
153 return 0;
154 if (strcmp(name, "bus") == 0)
155 return 0;
157 object_property_parse(obj, value, name, &err);
158 if (err != NULL) {
159 qerror_report_err(err);
160 error_free(err);
161 return -1;
163 return 0;
166 static const char *find_typename_by_alias(const char *alias)
168 int i;
170 for (i = 0; qdev_alias_table[i].alias; i++) {
171 if (qdev_alias_table[i].arch_mask &&
172 !(qdev_alias_table[i].arch_mask & arch_type)) {
173 continue;
176 if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
177 return qdev_alias_table[i].typename;
181 return NULL;
184 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
186 ObjectClass *oc;
187 DeviceClass *dc;
189 oc = object_class_by_name(*driver);
190 if (!oc) {
191 const char *typename = find_typename_by_alias(*driver);
193 if (typename) {
194 *driver = typename;
195 oc = object_class_by_name(*driver);
199 if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
200 error_setg(errp, "'%s' is not a valid device model name", *driver);
201 return NULL;
204 if (object_class_is_abstract(oc)) {
205 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
206 "non-abstract device type");
207 return NULL;
210 dc = DEVICE_CLASS(oc);
211 if (dc->cannot_instantiate_with_device_add_yet ||
212 (qdev_hotplug && !dc->hotpluggable)) {
213 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
214 "pluggable device type");
215 return NULL;
218 return dc;
222 int qdev_device_help(QemuOpts *opts)
224 Error *local_err = NULL;
225 const char *driver;
226 DevicePropertyInfoList *prop_list;
227 DevicePropertyInfoList *prop;
229 driver = qemu_opt_get(opts, "driver");
230 if (driver && is_help_option(driver)) {
231 qdev_print_devinfos(false);
232 return 1;
235 if (!driver || !qemu_opt_has_help_opt(opts)) {
236 return 0;
239 qdev_get_device_class(&driver, &local_err);
240 if (local_err) {
241 goto error;
244 prop_list = qmp_device_list_properties(driver, &local_err);
245 if (local_err) {
246 goto error;
249 for (prop = prop_list; prop; prop = prop->next) {
250 error_printf("%s.%s=%s", driver,
251 prop->value->name,
252 prop->value->type);
253 if (prop->value->has_description) {
254 error_printf(" (%s)\n", prop->value->description);
255 } else {
256 error_printf("\n");
260 qapi_free_DevicePropertyInfoList(prop_list);
261 return 1;
263 error:
264 error_printf("%s\n", error_get_pretty(local_err));
265 error_free(local_err);
266 return 1;
269 static Object *qdev_get_peripheral(void)
271 static Object *dev;
273 if (dev == NULL) {
274 dev = container_get(qdev_get_machine(), "/peripheral");
277 return dev;
280 static Object *qdev_get_peripheral_anon(void)
282 static Object *dev;
284 if (dev == NULL) {
285 dev = container_get(qdev_get_machine(), "/peripheral-anon");
288 return dev;
291 static void qbus_list_bus(DeviceState *dev)
293 BusState *child;
294 const char *sep = " ";
296 error_printf("child busses at \"%s\":",
297 dev->id ? dev->id : object_get_typename(OBJECT(dev)));
298 QLIST_FOREACH(child, &dev->child_bus, sibling) {
299 error_printf("%s\"%s\"", sep, child->name);
300 sep = ", ";
302 error_printf("\n");
305 static void qbus_list_dev(BusState *bus)
307 BusChild *kid;
308 const char *sep = " ";
310 error_printf("devices at \"%s\":", bus->name);
311 QTAILQ_FOREACH(kid, &bus->children, sibling) {
312 DeviceState *dev = kid->child;
313 error_printf("%s\"%s\"", sep, object_get_typename(OBJECT(dev)));
314 if (dev->id)
315 error_printf("/\"%s\"", dev->id);
316 sep = ", ";
318 error_printf("\n");
321 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
323 BusState *child;
325 QLIST_FOREACH(child, &dev->child_bus, sibling) {
326 if (strcmp(child->name, elem) == 0) {
327 return child;
330 return NULL;
333 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
335 BusChild *kid;
338 * try to match in order:
339 * (1) instance id, if present
340 * (2) driver name
341 * (3) driver alias, if present
343 QTAILQ_FOREACH(kid, &bus->children, sibling) {
344 DeviceState *dev = kid->child;
345 if (dev->id && strcmp(dev->id, elem) == 0) {
346 return dev;
349 QTAILQ_FOREACH(kid, &bus->children, sibling) {
350 DeviceState *dev = kid->child;
351 if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
352 return dev;
355 QTAILQ_FOREACH(kid, &bus->children, sibling) {
356 DeviceState *dev = kid->child;
357 DeviceClass *dc = DEVICE_GET_CLASS(dev);
359 if (qdev_class_has_alias(dc) &&
360 strcmp(qdev_class_get_alias(dc), elem) == 0) {
361 return dev;
364 return NULL;
367 static BusState *qbus_find_recursive(BusState *bus, const char *name,
368 const char *bus_typename)
370 BusClass *bus_class = BUS_GET_CLASS(bus);
371 BusChild *kid;
372 BusState *child, *ret;
373 int match = 1;
375 if (name && (strcmp(bus->name, name) != 0)) {
376 match = 0;
377 } else if (bus_typename && !object_dynamic_cast(OBJECT(bus), bus_typename)) {
378 match = 0;
379 } else if ((bus_class->max_dev != 0) && (bus_class->max_dev <= bus->max_index)) {
380 if (name != NULL) {
381 /* bus was explicitly specified: return an error. */
382 qerror_report(ERROR_CLASS_GENERIC_ERROR, "Bus '%s' is full",
383 bus->name);
384 return NULL;
385 } else {
386 /* bus was not specified: try to find another one. */
387 match = 0;
390 if (match) {
391 return bus;
394 QTAILQ_FOREACH(kid, &bus->children, sibling) {
395 DeviceState *dev = kid->child;
396 QLIST_FOREACH(child, &dev->child_bus, sibling) {
397 ret = qbus_find_recursive(child, name, bus_typename);
398 if (ret) {
399 return ret;
403 return NULL;
406 static BusState *qbus_find(const char *path)
408 DeviceState *dev;
409 BusState *bus;
410 char elem[128];
411 int pos, len;
413 /* find start element */
414 if (path[0] == '/') {
415 bus = sysbus_get_default();
416 pos = 0;
417 } else {
418 if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
419 assert(!path[0]);
420 elem[0] = len = 0;
422 bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
423 if (!bus) {
424 qerror_report(QERR_BUS_NOT_FOUND, elem);
425 return NULL;
427 pos = len;
430 for (;;) {
431 assert(path[pos] == '/' || !path[pos]);
432 while (path[pos] == '/') {
433 pos++;
435 if (path[pos] == '\0') {
436 return bus;
439 /* find device */
440 if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
441 g_assert_not_reached();
442 elem[0] = len = 0;
444 pos += len;
445 dev = qbus_find_dev(bus, elem);
446 if (!dev) {
447 qerror_report(QERR_DEVICE_NOT_FOUND, elem);
448 if (!monitor_cur_is_qmp()) {
449 qbus_list_dev(bus);
451 return NULL;
454 assert(path[pos] == '/' || !path[pos]);
455 while (path[pos] == '/') {
456 pos++;
458 if (path[pos] == '\0') {
459 /* last specified element is a device. If it has exactly
460 * one child bus accept it nevertheless */
461 switch (dev->num_child_bus) {
462 case 0:
463 qerror_report(ERROR_CLASS_GENERIC_ERROR,
464 "Device '%s' has no child bus", elem);
465 return NULL;
466 case 1:
467 return QLIST_FIRST(&dev->child_bus);
468 default:
469 qerror_report(ERROR_CLASS_GENERIC_ERROR,
470 "Device '%s' has multiple child busses", elem);
471 if (!monitor_cur_is_qmp()) {
472 qbus_list_bus(dev);
474 return NULL;
478 /* find bus */
479 if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
480 g_assert_not_reached();
481 elem[0] = len = 0;
483 pos += len;
484 bus = qbus_find_bus(dev, elem);
485 if (!bus) {
486 qerror_report(QERR_BUS_NOT_FOUND, elem);
487 if (!monitor_cur_is_qmp()) {
488 qbus_list_bus(dev);
490 return NULL;
495 DeviceState *qdev_device_add(QemuOpts *opts)
497 DeviceClass *dc;
498 const char *driver, *path, *id;
499 DeviceState *dev;
500 BusState *bus = NULL;
501 Error *err = NULL;
503 driver = qemu_opt_get(opts, "driver");
504 if (!driver) {
505 qerror_report(QERR_MISSING_PARAMETER, "driver");
506 return NULL;
509 /* find driver */
510 dc = qdev_get_device_class(&driver, &err);
511 if (err) {
512 qerror_report_err(err);
513 error_free(err);
514 return NULL;
517 /* find bus */
518 path = qemu_opt_get(opts, "bus");
519 if (path != NULL) {
520 bus = qbus_find(path);
521 if (!bus) {
522 return NULL;
524 if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
525 qerror_report(ERROR_CLASS_GENERIC_ERROR,
526 "Device '%s' can't go on a %s bus",
527 driver, object_get_typename(OBJECT(bus)));
528 return NULL;
530 } else if (dc->bus_type != NULL) {
531 bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
532 if (!bus) {
533 qerror_report(ERROR_CLASS_GENERIC_ERROR,
534 "No '%s' bus found for device '%s'",
535 dc->bus_type, driver);
536 return NULL;
539 if (qdev_hotplug && bus && !qbus_is_hotpluggable(bus)) {
540 qerror_report(QERR_BUS_NO_HOTPLUG, bus->name);
541 return NULL;
544 /* create device */
545 dev = DEVICE(object_new(driver));
547 if (bus) {
548 qdev_set_parent_bus(dev, bus);
551 id = qemu_opts_id(opts);
552 if (id) {
553 dev->id = id;
556 if (dev->id) {
557 object_property_add_child(qdev_get_peripheral(), dev->id,
558 OBJECT(dev), NULL);
559 } else {
560 static int anon_count;
561 gchar *name = g_strdup_printf("device[%d]", anon_count++);
562 object_property_add_child(qdev_get_peripheral_anon(), name,
563 OBJECT(dev), NULL);
564 g_free(name);
567 /* set properties */
568 if (qemu_opt_foreach(opts, set_property, dev, NULL)) {
569 object_unparent(OBJECT(dev));
570 object_unref(OBJECT(dev));
571 return NULL;
574 dev->opts = opts;
575 object_property_set_bool(OBJECT(dev), true, "realized", &err);
576 if (err != NULL) {
577 qerror_report_err(err);
578 error_free(err);
579 dev->opts = NULL;
580 object_unparent(OBJECT(dev));
581 object_unref(OBJECT(dev));
582 qerror_report(QERR_DEVICE_INIT_FAILED, driver);
583 return NULL;
585 return dev;
589 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
590 static void qbus_print(Monitor *mon, BusState *bus, int indent);
592 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
593 int indent)
595 if (!props)
596 return;
597 for (; props->name; props++) {
598 Error *err = NULL;
599 char *value;
600 char *legacy_name = g_strdup_printf("legacy-%s", props->name);
601 if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
602 value = object_property_get_str(OBJECT(dev), legacy_name, &err);
603 } else {
604 value = object_property_print(OBJECT(dev), props->name, true, &err);
606 g_free(legacy_name);
608 if (err) {
609 error_free(err);
610 continue;
612 qdev_printf("%s = %s\n", props->name,
613 value && *value ? value : "<null>");
614 g_free(value);
618 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
620 BusClass *bc = BUS_GET_CLASS(bus);
622 if (bc->print_dev) {
623 bc->print_dev(mon, dev, indent);
627 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
629 ObjectClass *class;
630 BusState *child;
631 NamedGPIOList *ngl;
633 qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
634 dev->id ? dev->id : "");
635 indent += 2;
636 QLIST_FOREACH(ngl, &dev->gpios, node) {
637 if (ngl->num_in) {
638 qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
639 ngl->num_in);
641 if (ngl->num_out) {
642 qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
643 ngl->num_out);
646 class = object_get_class(OBJECT(dev));
647 do {
648 qdev_print_props(mon, dev, DEVICE_CLASS(class)->props, indent);
649 class = object_class_get_parent(class);
650 } while (class != object_class_by_name(TYPE_DEVICE));
651 bus_print_dev(dev->parent_bus, mon, dev, indent);
652 QLIST_FOREACH(child, &dev->child_bus, sibling) {
653 qbus_print(mon, child, indent);
657 static void qbus_print(Monitor *mon, BusState *bus, int indent)
659 BusChild *kid;
661 qdev_printf("bus: %s\n", bus->name);
662 indent += 2;
663 qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
664 QTAILQ_FOREACH(kid, &bus->children, sibling) {
665 DeviceState *dev = kid->child;
666 qdev_print(mon, dev, indent);
669 #undef qdev_printf
671 void hmp_info_qtree(Monitor *mon, const QDict *qdict)
673 if (sysbus_get_default())
674 qbus_print(mon, sysbus_get_default(), 0);
677 void hmp_info_qdm(Monitor *mon, const QDict *qdict)
679 qdev_print_devinfos(true);
682 typedef struct QOMCompositionState {
683 Monitor *mon;
684 int indent;
685 } QOMCompositionState;
687 static void print_qom_composition(Monitor *mon, Object *obj, int indent);
689 static int print_qom_composition_child(Object *obj, void *opaque)
691 QOMCompositionState *s = opaque;
693 print_qom_composition(s->mon, obj, s->indent);
695 return 0;
698 static void print_qom_composition(Monitor *mon, Object *obj, int indent)
700 QOMCompositionState s = {
701 .mon = mon,
702 .indent = indent + 2,
704 char *name;
706 if (obj == object_get_root()) {
707 name = g_strdup("");
708 } else {
709 name = object_get_canonical_path_component(obj);
711 monitor_printf(mon, "%*s/%s (%s)\n", indent, "", name,
712 object_get_typename(obj));
713 g_free(name);
714 object_child_foreach(obj, print_qom_composition_child, &s);
717 void hmp_info_qom_tree(Monitor *mon, const QDict *dict)
719 const char *path = qdict_get_try_str(dict, "path");
720 Object *obj;
721 bool ambiguous = false;
723 if (path) {
724 obj = object_resolve_path(path, &ambiguous);
725 if (!obj) {
726 monitor_printf(mon, "Path '%s' could not be resolved.\n", path);
727 return;
729 if (ambiguous) {
730 monitor_printf(mon, "Warning: Path '%s' is ambiguous.\n", path);
731 return;
733 } else {
734 obj = qdev_get_machine();
736 print_qom_composition(mon, obj, 0);
739 int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
741 Error *local_err = NULL;
742 QemuOpts *opts;
743 DeviceState *dev;
745 opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
746 if (local_err) {
747 qerror_report_err(local_err);
748 error_free(local_err);
749 return -1;
751 if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
752 qemu_opts_del(opts);
753 return 0;
755 dev = qdev_device_add(opts);
756 if (!dev) {
757 qemu_opts_del(opts);
758 return -1;
760 object_unref(OBJECT(dev));
761 return 0;
764 void qmp_device_del(const char *id, Error **errp)
766 Object *obj;
767 char *root_path = object_get_canonical_path(qdev_get_peripheral());
768 char *path = g_strdup_printf("%s/%s", root_path, id);
770 g_free(root_path);
771 obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
772 g_free(path);
774 if (!obj) {
775 error_set(errp, QERR_DEVICE_NOT_FOUND, id);
776 return;
779 qdev_unplug(DEVICE(obj), errp);
782 void qdev_machine_init(void)
784 qdev_get_peripheral_anon();
785 qdev_get_peripheral();
788 QemuOptsList qemu_device_opts = {
789 .name = "device",
790 .implied_opt_name = "driver",
791 .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
792 .desc = {
794 * no elements => accept any
795 * sanity checking will happen later
796 * when setting device properties
798 { /* end of list */ }
802 QemuOptsList qemu_global_opts = {
803 .name = "global",
804 .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
805 .desc = {
807 .name = "driver",
808 .type = QEMU_OPT_STRING,
810 .name = "property",
811 .type = QEMU_OPT_STRING,
813 .name = "value",
814 .type = QEMU_OPT_STRING,
816 { /* end of list */ }
820 int qemu_global_option(const char *str)
822 char driver[64], property[64];
823 QemuOpts *opts;
824 int rc, offset;
826 rc = sscanf(str, "%63[^.=].%63[^=]%n", driver, property, &offset);
827 if (rc == 2 && str[offset] == '=') {
828 opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
829 qemu_opt_set(opts, "driver", driver, &error_abort);
830 qemu_opt_set(opts, "property", property, &error_abort);
831 qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
832 return 0;
835 opts = qemu_opts_parse(&qemu_global_opts, str, false);
836 if (!opts) {
837 return -1;
840 return 0;