---
name: "_U_dyn_register"
section: "3"
platform: "linux"
package: "libunwind"
version: "1.8.3-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/_U_dyn_register"
---

# \_U\_dyn\_register(3)

## NAME

\_U\_dyn\_register -- register unwind info for dynamically generated code

## SYNOPSIS

\#include \<libunwind.h\>\

void \_U\_dyn\_register(unw\_dyn\_info\_t \*di);\

## DESCRIPTION

The \_U\_dyn\_register() routine registers unwind info for a  dynamically generated procedure. The procedure's unwind info is  described by a structure of type unw\_dyn\_info\_t (see  libunwind-dynamic(3libunwind)). A pointer to this structure is  passed in argument di.

The \_U\_dyn\_register() routine is guaranteed to execute in  constant time (in the absence of contention from concurrent calls to  \_U\_dyn\_register() or \_U\_dyn\_cancel()).

## THREAD AND SIGNAL SAFETY

\_U\_dyn\_register() is thread safe but *not* safe to use  from a signal handler.

## SEE ALSO

libunwind-dynamic(3libunwind), \_U\_dyn\_cancel(3libunwind)

## AUTHOR

David Mosberger-Tang\
 Email: **dmosberger@gmail.com**\
 WWW: **http://www.nongnu.org/libunwind/**.