---
name: "sd_bus_add_object_manager"
section: "3"
platform: "linux"
package: "systemd-libs"
version: "262.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/sd_bus_add_object_manager"
---

# sd\_bus\_add\_object\_manager(3)

Add a D-Bus object manager for a D-Bus object sub-tree

## NAME

sd\_bus\_add\_object\_manager - Add a D-Bus object manager for a D-Bus object sub-tree

## SYNOPSIS

```
#include <systemd/sd-bus.h>
```

**int sd\_bus\_add\_object\_manager(sd\_bus \****bus***, sd\_bus\_slot \*\****slot***, const char \****path***);**

## DESCRIPTION

**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)](/sd_bus_emit_interfaces_added/3.md) and [**sd\_bus\_emit\_interfaces\_removed**(3)](/sd_bus_emit_interfaces_removed/3.md) 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)](/sd_bus_slot_set_floating/3.md). 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)](/sd_bus_slot_unref/3.md).

## RETURN VALUE

On success, **sd\_bus\_add\_object\_manager()** returns a non-negative integer. On failure, it returns a negative errno-style error code.

### Errors

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, library or module instance.

**-ENOMEM**

Memory allocation failed.

## NOTES

Functions described here are available as a shared library, which can be compiled against and linked to with the **libsystemd** [**pkg-config**(1)](/pkg-config/1.md) file.

All functions listed here are thread-agnostic and only a single thread may operate on a given object at any given time. Different threads may access the same object at different times. Multiple independent objects may be used from different threads in parallel.

The code described here uses [**getenv**(3)](/getenv/3.md), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call [**setenv**(3)](/setenv/3.md) from a parallel thread. It is recommended to only do calls to **setenv()** from an early phase of the program when no other threads have been started.

## HISTORY

**sd\_bus\_add\_object\_manager()** was added in version 221.

## SEE ALSO

[**sd-bus**(3)](/sd-bus/3.md), [**busctl**(1)](/busctl/1.md), [**sd\_bus\_add\_object\_vtable**(3)](/sd_bus_add_object_vtable/3.md), [**sd\_bus\_emit\_interfaces\_added**(3)](/sd_bus_emit_interfaces_added/3.md), [**sd\_bus\_slot\_unref**(3)](/sd_bus_slot_unref/3.md)

## NOTES

- 1\.

  org.freedesktop.DBus.ObjectManager

  https://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager