---
name: "sd_bus_message_at_end"
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_message_at_end"
---

# sd\_bus\_message\_at\_end(3)

Check if a message has been fully read

## NAME

sd\_bus\_message\_at\_end - Check if a message has been fully read

## SYNOPSIS

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

**int sd\_bus\_message\_at\_end(sd\_bus\_message \****m***, int** *complete***);**

## DESCRIPTION

**sd\_bus\_message\_at\_end()** returns whether all data from the currently opened container in *m* or all data from all containers in *m* has been read. If *complete* is zero, this function returns whether all data from the currently opened container has been read. If *complete* is non-zero, this function returns whether all data from all containers in *m* has been read.

## RETURN VALUE

If all data from all containers or the current container (depending on the value of *complete*) has been read, **sd\_bus\_message\_at\_end()** returns a positive integer. If there is still data left to be read, it returns zero. On failure, it returns a negative errno-style error code.

### Errors

Returned errors may indicate the following problems:

**-EINVAL**

The *m* parameter is **NULL**.

Added in version 246.

**-EPERM**

The message is not sealed.

Added in version 246.

## 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\_message\_at\_end()** was added in version 246.

## SEE ALSO

[**systemd**(1)](/systemd/1.md), [**sd-bus**(3)](/sd-bus/3.md), [**sd\_bus\_message\_read**(3)](/sd_bus_message_read/3.md)