sd_bus_add_object_manager − Add a D−Bus object manager for a D−Bus object sub−tree
#include <elogind/sd−bus.h>
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int sd_bus_add_object_manager(sd_bus *bus, sd_bus_slot **slot, const char *path); |
sd_bus_add_object_manager() installs a handler for the given path that implements the GetManagedObjects() method of the org.freedesktop.DBus.ObjectManager interface. See org.freedesktop.DBus.ObjectManager [1] for more information.
To implement the InterfacesAdded and InterfacesRemoved signals of the org.freedesktop.DBus.ObjectManager interface, call sd_bus_emit_interfaces_added(3) and sd_bus_emit_interfaces_removed(3) whenever interfaces are added or removed from the sub−tree, respectively.
When sd_bus_add_object_manager() succeeds, a slot is created internally. If the output parameter slot is NULL, a "floating" slot object is created, see sd_bus_slot_set_floating(3). Otherwise, a pointer to the slot object is returned. In that case, the reference to the slot object should be dropped when the object manager is not needed anymore, see sd_bus_slot_unref(3).
On success, sd_bus_add_object_manager() returns a non−negative integer. On failure, it returns a negative errno−style error code.
Returned errors may indicate the following problems:
−EINVAL
One of the required parameters is NULL or path is not a valid object path.
−ENOPKG
The bus cannot be resolved.
−ECHILD
The bus was created in a different process.
−ENOMEM
Memory allocation failed.
These APIs are implemented as a shared library, which can be compiled and linked to with the libelogind pkg-config(1) file.
sd-bus(3), busctl(1), sd_bus_add_object_vtable(3), sd_bus_emit_interfaces_added(3), sd_bus_slot_unref(3)
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1. |
org.freedesktop.DBus.ObjectManager |
https://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager