---
name: "sd_bus_get_name_machine_id"
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_get_name_machine_id"
---

# sd\_bus\_get\_name\_machine\_id(3)

Retrieve a bus client's machine identity

## NAME

sd\_bus\_get\_name\_machine\_id - Retrieve a bus client's machine identity

## SYNOPSIS

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

**int sd\_bus\_get\_name\_machine\_id(sd\_bus \****bus***, const char \****name***, sd\_id128\_t \****machine***);**

## DESCRIPTION

**sd\_bus\_get\_name\_machine\_id()** retrieves the D-Bus machine identity of the machine that the bus client identified by *name* is running on. Internally, it calls the **GetMachineId** method of the **org.freedesktop.DBus.Peer** interface. The D-Bus machine identity is a 128-bit UUID. On Linux systems running systemd, this corresponds to the contents of /etc/machine-id. On success, the machine identity is stored in *machine*.

## RETURN VALUE

On success, this function returns a non-negative integer. On failure, it returns a negative errno-style error code.

### Errors

Returned errors may indicate the following problems:

**-EINVAL**

An argument is invalid.

**-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\_get\_name\_machine\_id()** was added in version 221.

## SEE ALSO

[**systemd**(1)](/systemd/1.md), [**sd-bus**(3)](/sd-bus/3.md)