qemu

qmp-cmds-control.c (6438B)

---

 /*
  * QMP commands related to the monitor (common to sysemu and tools)
  *
  * Copyright (c) 2003-2004 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 
 #include "qemu/osdep.h"
 
 #include "monitor-internal.h"
 #include "qemu-version.h"
 #include "qapi/compat-policy.h"
 #include "qapi/error.h"
 #include "qapi/qapi-commands-control.h"
 #include "qapi/qapi-commands-introspect.h"
 #include "qapi/qapi-emit-events.h"
 #include "qapi/qapi-introspect.h"
 #include "qapi/qapi-visit-introspect.h"
 #include "qapi/qobject-input-visitor.h"
 
 /*
  * Accept QMP capabilities in @list for @mon.
  * On success, set mon->qmp.capab[], and return true.
  * On error, set @errp, and return false.
  */
 static bool qmp_caps_accept(MonitorQMP *mon, QMPCapabilityList *list,
                             Error **errp)
 {
     GString *unavailable = NULL;
     bool capab[QMP_CAPABILITY__MAX];
 
     memset(capab, 0, sizeof(capab));
 
     for (; list; list = list->next) {
         if (!mon->capab_offered[list->value]) {
             if (!unavailable) {
                 unavailable = g_string_new(QMPCapability_str(list->value));
             } else {
                 g_string_append_printf(unavailable, ", %s",
                                       QMPCapability_str(list->value));
             }
         }
         capab[list->value] = true;
     }
 
     if (unavailable) {
         error_setg(errp, "Capability %s not available", unavailable->str);
         g_string_free(unavailable, true);
         return false;
     }
 
     memcpy(mon->capab, capab, sizeof(capab));
     return true;
 }
 
 void qmp_qmp_capabilities(bool has_enable, QMPCapabilityList *enable,
                           Error **errp)
 {
     Monitor *cur_mon = monitor_cur();
     MonitorQMP *mon;
 
     assert(monitor_is_qmp(cur_mon));
     mon = container_of(cur_mon, MonitorQMP, common);
 
     if (mon->commands == &qmp_commands) {
         error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
                   "Capabilities negotiation is already complete, command "
                   "ignored");
         return;
     }
 
     if (!qmp_caps_accept(mon, enable, errp)) {
         return;
     }
 
     mon->commands = &qmp_commands;
 }
 
 VersionInfo *qmp_query_version(Error **errp)
 {
     VersionInfo *info = g_new0(VersionInfo, 1);
 
     info->qemu = g_new0(VersionTriple, 1);
     info->qemu->major = QEMU_VERSION_MAJOR;
     info->qemu->minor = QEMU_VERSION_MINOR;
     info->qemu->micro = QEMU_VERSION_MICRO;
     info->package = g_strdup(QEMU_PKGVERSION);
 
     return info;
 }
 
 static void query_commands_cb(const QmpCommand *cmd, void *opaque)
 {
     CommandInfo *info;
     CommandInfoList **list = opaque;
 
     if (!cmd->enabled) {
         return;
     }
 
     info = g_malloc0(sizeof(*info));
     info->name = g_strdup(cmd->name);
     QAPI_LIST_PREPEND(*list, info);
 }
 
 CommandInfoList *qmp_query_commands(Error **errp)
 {
     CommandInfoList *list = NULL;
     Monitor *cur_mon = monitor_cur();
     MonitorQMP *mon;
 
     assert(monitor_is_qmp(cur_mon));
     mon = container_of(cur_mon, MonitorQMP, common);
 
     qmp_for_each_command(mon->commands, query_commands_cb, &list);
 
     return list;
 }
 
 static void *split_off_generic_list(void *list,
                                     bool (*splitp)(void *elt),
                                     void **part)
 {
     GenericList *keep = NULL, **keep_tailp = &keep;
     GenericList *split = NULL, **split_tailp = &split;
     GenericList *tail;
 
     for (tail = list; tail; tail = tail->next) {
         if (splitp(tail)) {
             *split_tailp = tail;
             split_tailp = &tail->next;
         } else {
             *keep_tailp = tail;
             keep_tailp = &tail->next;
         }
     }
 
     *keep_tailp = *split_tailp = NULL;
     *part = split;
     return keep;
 }
 
 static bool is_in(const char *s, strList *list)
 {
     strList *tail;
 
     for (tail = list; tail; tail = tail->next) {
         if (!strcmp(tail->value, s)) {
             return true;
         }
     }
     return false;
 }
 
 static bool is_entity_deprecated(void *link)
 {
     return is_in("deprecated", ((SchemaInfoList *)link)->value->features);
 }
 
 static bool is_member_deprecated(void *link)
 {
     return is_in("deprecated",
                  ((SchemaInfoObjectMemberList *)link)->value->features);
 }
 
 static SchemaInfoList *zap_deprecated(SchemaInfoList *schema)
 {
     void *to_zap;
     SchemaInfoList *tail;
     SchemaInfo *ent;
 
     schema = split_off_generic_list(schema, is_entity_deprecated, &to_zap);
     qapi_free_SchemaInfoList(to_zap);
 
     for (tail = schema; tail; tail = tail->next) {
         ent = tail->value;
         if (ent->meta_type == SCHEMA_META_TYPE_OBJECT) {
             ent->u.object.members
                 = split_off_generic_list(ent->u.object.members,
                                          is_member_deprecated, &to_zap);
             qapi_free_SchemaInfoObjectMemberList(to_zap);
         }
     }
 
     return schema;
 }
 
 SchemaInfoList *qmp_query_qmp_schema(Error **errp)
 {
     QObject *obj = qobject_from_qlit(&qmp_schema_qlit);
     Visitor *v = qobject_input_visitor_new(obj);
     SchemaInfoList *schema = NULL;
 
     /* test_visitor_in_qmp_introspect() ensures this can't fail */
     visit_type_SchemaInfoList(v, NULL, &schema, &error_abort);
     g_assert(schema);
 
     qobject_unref(obj);
     visit_free(v);
 
     if (compat_policy.deprecated_output == COMPAT_POLICY_OUTPUT_HIDE) {
         return zap_deprecated(schema);
     }
     return schema;
 }