---
name: "dwarf_vendor_ext"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/dwarf_vendor_ext"
---

# dwarf\_vendor\_ext(3)

add vendor-specific macro information to a DWARF producer instance

## NAME

**dwarf\_vendor\_ext** – add vendor-specific macro information to a DWARF producer instance

## LIBRARY

library “libdwarf”

## SYNOPSIS

**#include \<libdwarf.h\>**

*int*\

**dwarf\_vendor\_ext**(*Dwarf\_P\_Debug dbg*, *Dwarf\_Unsigned constant*, *char \*string*, *Dwarf\_Error \*err*);

## DESCRIPTION

Function **dwarf\_vendor\_ext**() adds a vendor-specific macro information entry to a DWARF producer instance.

Argument *dbg* should reference a DWARF producer instance allocated using [dwarf\_producer\_init(3)](/dwarf_producer_init/3.md) or [dwarf\_producer\_init\_b(3)](/dwarf_producer_init_b/3.md).

Argument *constant* specifies a constant value for the macro information entry.

Argument *string* point to a NUL-terminated string containing the string value for the macro information entry.

If argument *err* is not NULL, it will be used to store error information in case of an error.

The meaning of the arguments *constant* and *string* are not defined by the DWARF specification, but are instead governed by application and vendor conventions.

## RETURN VALUES

On success, function **dwarf\_vendor\_ext**() returns DW\_DLV\_OK. In case of an error, function **dwarf\_vendor\_ext**() returns DW\_DLV\_ERROR and sets the argument *err*.

## ERRORS

Function **dwarf\_vendor\_ext**() can fail with:

- \[DW\_DLE\_ARGUMENT\]

  Either arguments *dbg* or *string* was NULL.

- \[DW\_DLE\_MEMORY\]

  An out of memory condition was encountered during the execution of the function.

## SEE ALSO

[dwarf(3)](/dwarf/3.md), [dwarf\_def\_macro(3)](/dwarf_def_macro/3.md), [dwarf\_end\_macro\_file(3)](/dwarf_end_macro_file/3.md), [dwarf\_producer\_init(3)](/dwarf_producer_init/3.md), [dwarf\_producer\_init\_b(3)](/dwarf_producer_init_b/3.md), [dwarf\_start\_macro\_file(3)](/dwarf_start_macro_file/3.md), [dwarf\_undef\_macro(3)](/dwarf_undef_macro/3.md)