---
name: "PR_GET_TAGGED_ADDR_CTRL"
section: "2const"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/PR_GET_TAGGED_ADDR_CTRL"
---

# PR\_GET\_TAGGED\_ADDR\_CTRL(2const)

get the tagged address mode for the calling thread

## NAME

PR\_GET\_TAGGED\_ADDR\_CTRL - get the tagged address mode for the calling thread

## LIBRARY

Standard C library (*libc*, *-lc*)

## SYNOPSIS

```
#include <linux/prctl.h>  /* Definition of PR_* constants */
#include <sys/prctl.h>
```

**int prctl(PR\_GET\_TAGGED\_ADDR\_CTRL, 0L, 0L, 0L, 0L);**

## DESCRIPTION

Returns the current tagged address mode for the calling thread.

The call returns a nonnegative value describing the current tagged address mode, encoded in the same way as the *mode* argument of [**PR\_SET\_TAGGED\_ADDR\_CTRL**(2const)](/PR_SET_TAGGED_ADDR_CTRL/2const.md).

## RETURN VALUE

On success, this call returns the nonnegative value described above. On error, -1 is returned, and *errno* is set to indicate the error.

## ERRORS

This feature is disabled or unsupported by the kernel, or disabled via */proc/sys/abi/tagged\_addr\_disabled*.

## FILES

- */proc/sys/abi/tagged\_addr\_disabled*

  ## STANDARDS

Linux. arm64 only.

## HISTORY

Linux 5.4 (arm64).

## SEE ALSO

[**prctl**(2)](/prctl/2.md), [**PR\_SET\_TAGGED\_ADDR\_CTRL**(2const)](/PR_SET_TAGGED_ADDR_CTRL/2const.md)

For more information, see the kernel source file *Documentation/arm64/tagged-address-abi.rst*.