util/dbus.c

   1 /*
   2  * Helpers for using D-Bus
   3  *
   4  * Copyright (C) 2019 Red Hat, Inc.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qemu/dbus.h"
  12 #include "qemu/error-report.h"
  13 #include "qapi/error.h"
  14
  15 /*
  16  * qemu_dbus_get_queued_owners() - return the list of queued unique names
  17  * @connection: A GDBusConnection
  18  * @name: a service name
  19  *
  20  * Return: a GStrv of unique names, or NULL on failure.
  21  */
  22 GStrv
  23 qemu_dbus_get_queued_owners(GDBusConnection *connection, const char *name,
  24                             Error **errp)
  25 {
  26     g_autoptr(GDBusProxy) proxy = NULL;
  27     g_autoptr(GVariant) result = NULL;
  28     g_autoptr(GVariant) child = NULL;
  29     g_autoptr(GError) err = NULL;
  30
  31     proxy = g_dbus_proxy_new_sync(connection, G_DBUS_PROXY_FLAGS_NONE, NULL,
  32                                   "org.freedesktop.DBus",
  33                                   "/org/freedesktop/DBus",
  34                                   "org.freedesktop.DBus",
  35                                   NULL, &err);
  36     if (!proxy) {
  37         error_setg(errp, "Failed to create DBus proxy: %s", err->message);
  38         return NULL;
  39     }
  40
  41     result = g_dbus_proxy_call_sync(proxy, "ListQueuedOwners",
  42                                     g_variant_new("(s)", name),
  43                                     G_DBUS_CALL_FLAGS_NO_AUTO_START,
  44                                     -1, NULL, &err);
  45     if (!result) {
  46         if (g_error_matches(err,
  47                             G_DBUS_ERROR,
  48                             G_DBUS_ERROR_NAME_HAS_NO_OWNER)) {
  49             return g_new0(char *, 1);
  50         }
  51         error_setg(errp, "Failed to call ListQueuedOwners: %s", err->message);
  52         return NULL;
  53     }
  54
  55     child = g_variant_get_child_value(result, 0);
  56     return g_variant_dup_strv(child, NULL);
  57 }