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

# unw\_get\_elf\_filename\_by\_ip(3)

## NAME

unw\_get\_elf\_filename\_by\_ip -- get backing elf filename by instruction pointer

## SYNOPSIS

\#include \<libunwind.h\>\

int unw\_get\_elf\_filename\_by\_ip(unw\_addr\_space\_t as, unw\_word\_t ip, char \*bufp, size\_t len, unw\_word\_t \*offp, void \*arg);\

## DESCRIPTION

The unw\_get\_elf\_filename\_by\_ip() routine returns the backing  elf filename of a instruction pointer just like unw\_get\_elf\_filename(), except that the name is looked up by instruction pointer (IP) instead  of a cursor.

The routine expects the following arguments: as is the  address-space in which the instruction pointer should be looked up.  For a look-up in the local address-space,  unw\_local\_addr\_space can be passed for this argument.  Argument ip is the instruction-pointer for which the elf filename  should be looked up. The bufp argument is a pointer to  a character buffer that is at least len bytes long. This buffer  is used to return the elf filename. The offp argument  is a pointer to a word that is used to return the byte offset of the  instruction-pointer relative to the start of the elf filename.  Lastly, arg is the address space argument that should be used  when accessing the address space. It has the same purpose as the  argument of the same name for unw\_init\_remote(). When  accessing the local address space (first argument is  unw\_local\_addr\_space), NULL must be passed for this  argument.

## RETURN VALUE

On successful completion, unw\_get\_elf\_filename\_by\_ip() returns 0. Otherwise the negative value of one of the error codes  below is returned.

## THREAD AND SIGNAL SAFETY

unw\_get\_elf\_filename\_by\_ip() is thread safe. If the local  address-space is passed in argument as, this routine is also  safe to use from a signal handler.

## ERRORS

- UNW\_EUNSPEC

   An unspecified error occurred.

- UNW\_ENOINFO

   Libunwind was unable to determine  the elf filename of the instruction pointer.

- UNW\_ENOMEM

   The elf filename is too long to fit  in the buffer provided. A truncated version of the name has been  returned.

## SEE ALSO

libunwind(3libunwind), unw\_get\_elf\_filename(3libunwind), unw\_create\_addr\_space(3libunwind), unw\_init\_remote(3libunwind)

## AUTHOR

Xiang Lin\
 Email: **myd.xia@gmail.com**\