---
name: "sd_bus_reply_method_errorf"
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_reply_method_error"
---

# sd\_bus\_reply\_method\_errorf(3)

Reply with an error to a D-Bus method call

Part of [sd\_bus\_reply\_method\_error(3)](/sd_bus_reply_method_error/3.md).

## NAME

sd\_bus\_reply\_method\_error, sd\_bus\_reply\_method\_errorf, sd\_bus\_reply\_method\_errorfv, sd\_bus\_reply\_method\_errno, sd\_bus\_reply\_method\_errnof, sd\_bus\_reply\_method\_errnofv - Reply with an error to a D-Bus method call

## SYNOPSIS

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

**int sd\_bus\_reply\_method\_error(sd\_bus\_message \****call***, const sd\_bus\_error \****e***);**

**int sd\_bus\_reply\_method\_errorf(sd\_bus\_message \****call***, const char \****name***, const char \****format***, ...);**

**int sd\_bus\_reply\_method\_errorfv(sd\_bus\_message \****call***, const char \****name***, const char \****format***, va\_list** *ap***);**

**int sd\_bus\_reply\_method\_errno(sd\_bus\_message \****call***, int** *error***, const sd\_bus\_error \****p***);**

**int sd\_bus\_reply\_method\_errnof(sd\_bus\_message \****call***, int** *error***, const char \****format***, ...);**

**int sd\_bus\_reply\_method\_errnofv(sd\_bus\_message \****call***, int** *error***, const char \****format***, va\_list** *ap***);**

## DESCRIPTION

The **sd\_bus\_reply\_method\_error()** function sends an error reply to the *call* message. The error structure *e* specifies the error to send, and is used as described in [**sd\_bus\_message\_new\_method\_error**(3)](/sd_bus_message_new_method_error/3.md). If no reply is expected to *call*, this function succeeds without sending a reply.

The **sd\_bus\_reply\_method\_errorf()** is to **sd\_bus\_reply\_method\_error()** what **sd\_bus\_message\_new\_method\_errorf()** is to **sd\_bus\_message\_new\_method\_error()**.

The **sd\_bus\_reply\_method\_errno()** is to **sd\_bus\_reply\_method\_error()** what **sd\_bus\_message\_new\_method\_errno()** is to **sd\_bus\_message\_new\_method\_error()**.

The **sd\_bus\_reply\_method\_errnof()** is to **sd\_bus\_reply\_method\_error()** what **sd\_bus\_message\_new\_method\_errnof()** is to **sd\_bus\_message\_new\_method\_error()**.

## RETURN VALUE

This function returns a non-negative integer if the error reply was successfully sent or if *call* does not expect a reply. On failure, it returns a negative errno-style error code.

### Errors

Returned errors may indicate the following problems:

**-EINVAL**

The input parameter *call* is **NULL**.

Message *call* is not a method call message.

Message *call* is not attached to a bus.

The error parameter *e* to **sd\_bus\_reply\_method\_error()** is not set, see [**sd\_bus\_error\_is\_set**(3)](/sd_bus_error_is_set/3.md).

**-EPERM**

Message *call* has been sealed.

**-ENOTCONN**

The bus to which message *call* is attached is not connected.

**-ENOMEM**

Memory allocation failed.

In addition, any error returned by [**sd\_bus\_send**(3)](/sd_bus_send/3.md) may be returned.

## 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.

## SEE ALSO

[**systemd**(1)](/systemd/1.md), [**sd-bus**(3)](/sd-bus/3.md), [**sd\_bus\_message\_new\_method\_error**(3)](/sd_bus_message_new_method_error/3.md)