---
name: "sd_bus_message_get_allow_interactive_authorization"
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_message_set_expect_reply"
---

# sd\_bus\_message\_get\_allow\_interactive\_authorization(3)

Set and query bus message metadata

Part of [sd\_bus\_message\_set\_expect\_reply(3)](/sd_bus_message_set_expect_reply/3.md).

## NAME

sd\_bus\_message\_set\_expect\_reply, sd\_bus\_message\_get\_expect\_reply, sd\_bus\_message\_set\_auto\_start, sd\_bus\_message\_get\_auto\_start, sd\_bus\_message\_set\_allow\_interactive\_authorization, sd\_bus\_message\_get\_allow\_interactive\_authorization - Set and query bus message metadata

## SYNOPSIS

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

**int sd\_bus\_message\_set\_expect\_reply(sd\_bus\_message \****message***, int** *b***);**

**int sd\_bus\_message\_get\_expect\_reply(sd\_bus\_message \****message***);**

**int sd\_bus\_message\_set\_auto\_start(sd\_bus\_message \****message***, int** *b***);**

**int sd\_bus\_message\_get\_auto\_start(sd\_bus\_message \****message***);**

**int sd\_bus\_message\_set\_allow\_interactive\_authorization(sd\_bus\_message \****message***, int** *b***);**

**int sd\_bus\_message\_get\_allow\_interactive\_authorization(sd\_bus\_message \****message***);**

## DESCRIPTION

**sd\_bus\_message\_set\_expect\_reply()** sets or clears the **NO\_REPLY\_EXPECTED** flag on the message *m*. This flag matters only for method call messages and is used to specify that no method return or error reply is expected. It is ignored for other types. Thus, for a method call message, calling

```
sd_bus_message_set_expect_reply(..., 0)
```

sets the flag and suppresses the reply.

**sd\_bus\_message\_get\_expect\_reply()** checks if the **NO\_REPLY\_EXPECTED** flag is set on the message *m*. It will return positive if it is not set, and zero if it is.

**sd\_bus\_message\_set\_auto\_start()** sets or clears the **NO\_AUTO\_START** flag on the message *m*. When the flag is set, the bus must not launch an owner for the destination name in response to this message. Calling

```
sd_bus_message_set_auto_start(..., 0)
```

sets the flag.

**sd\_bus\_message\_get\_auto\_start()** checks if the **NO\_AUTO\_START** flag is set on the message *m*. It will return positive if it is not set, and zero if it is.

**sd\_bus\_message\_set\_allow\_interactive\_authorization()** sets or clears the **ALLOW\_INTERACTIVE\_AUTHORIZATION** flag on the message *m*. Setting this flag informs the receiver that the caller is prepared to wait for interactive authorization via polkit or a similar framework. Note that setting this flag does not guarantee that the receiver will actually perform interactive authorization. Also, make sure to set a suitable message timeout when using this flag since interactive authorization could potentially take a long time as it depends on user input. If *b* is non-zero, the flag is set.

**sd\_bus\_message\_get\_allow\_interactive\_authorization()** checks if the **ALLOW\_INTERACTIVE\_AUTHORIZATION** flag is set on the message *m*. It will return a positive integer if the flag is set. Otherwise, it returns zero.

## RETURN VALUE

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

### Errors

Returned errors may indicate the following problems:

**-EINVAL**

The *message* parameter is **NULL**.

**-EPERM**

The message *message* is sealed when trying to set a flag.

The message *message* has wrong type.

## 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\_message\_set\_expect\_reply()**, **sd\_bus\_message\_get\_expect\_reply()**, **sd\_bus\_message\_set\_auto\_start()**, and **sd\_bus\_message\_get\_auto\_start()** were added in version 240.

**sd\_bus\_message\_set\_allow\_interactive\_authorization()** and **sd\_bus\_message\_get\_allow\_interactive\_authorization()** were added in version 246.

## SEE ALSO

[**systemd**(1)](/systemd/1.md), [**sd-bus**(3)](/sd-bus/3.md), [**sd\_bus\_set\_description**(3)](/sd_bus_set_description/3.md)