---
name: "sd_bus_slot_get_description"
section: "3"
platform: "linux"
package: "libsystemd-dev"
version: "257.13-1~deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/sd_bus_slot_set_description"
---

# sd\_bus\_slot\_get\_description(3)

Set or query the description of bus slot objects

Part of [sd\_bus\_slot\_set\_description(3)](/sd_bus_slot_set_description/3.md).

## NAME

sd\_bus\_slot\_set\_description, sd\_bus\_slot\_get\_description - Set or query the description of bus slot objects

## SYNOPSIS

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

**int sd\_bus\_slot\_set\_description(sd\_bus\_slot\*** *slot***, const char \****description***);**

**int sd\_bus\_slot\_get\_description(sd\_bus\_slot\*** *bus***, const char \*\****description***);**

## DESCRIPTION

**sd\_bus\_slot\_set\_description()** sets the description string that is used in logging to the specified string. The string is copied internally and freed when the bus slot object is deallocated. The *description* argument may be **NULL**, in which case the description is unset.

**sd\_bus\_slot\_get\_description()** returns a description string in *description*. If the string is not set, e.g. with **sd\_bus\_slot\_set\_description()**, and the slot is a bus match callback slot, the match string will be returned. Otherwise, **-ENXIO** is returned.

## RETURN VALUE

On success, these functions return 0 or a positive integer. On failure, they return a negative errno-style error code.

### Errors

Returned errors may indicate the following problems:

**-EINVAL**

An required argument is **NULL**.

**-ENXIO**

The bus slot object has no description.

**-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.

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\_slot\_set\_description()** and **sd\_bus\_slot\_get\_description()** were added in version 240.

## SEE ALSO

[**systemd**(1)](/systemd/1.md), [**sd-bus**(3)](/sd-bus/3.md), [**sd\_bus\_slot\_ref**(3)](/sd_bus_slot_ref/3.md), [**sd\_bus\_slot\_set\_userdata**(3)](/sd_bus_slot_set_userdata/3.md)