core: expose bus client names currently reffing a unit as property
This is useful for debugging client-side ref counting of units: for each ref taken on a unit the client's sender name is listed. If a client has multiple refs on the same unit it is listed multiple times.
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@ -561,6 +561,44 @@ int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error
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return sd_bus_reply_method_return(message, NULL);
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}
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static int property_get_refs(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *property,
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sd_bus_message *reply,
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void *userdata,
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sd_bus_error *error) {
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Unit *u = userdata;
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const char *i;
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int r;
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assert(bus);
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assert(reply);
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r = sd_bus_message_open_container(reply, 'a', "s");
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if (r < 0)
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return r;
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for (i = sd_bus_track_first(u->bus_track); i; i = sd_bus_track_next(u->bus_track)) {
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int c, k;
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c = sd_bus_track_count_name(u->bus_track, i);
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if (c < 0)
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return c;
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/* Add the item multiple times if the ref count for each is above 1 */
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for (k = 0; k < c; k++) {
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r = sd_bus_message_append(reply, "s", i);
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if (r < 0)
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return r;
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}
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}
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return sd_bus_message_close_container(reply);
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}
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const sd_bus_vtable bus_unit_vtable[] = {
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SD_BUS_VTABLE_START(0),
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@ -637,6 +675,7 @@ const sd_bus_vtable bus_unit_vtable[] = {
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SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), 0),
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SD_BUS_PROPERTY("CollectMode", "s", property_get_collect_mode, offsetof(Unit, collect_mode), 0),
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SD_BUS_PROPERTY("Refs", "as", property_get_refs, 0, 0),
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SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
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SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
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