---
name: "dwarf_get_aranges"
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_get_aranges"
---

# dwarf\_get\_aranges(3)

retrieve program address space mappings

## NAME

**dwarf\_get\_aranges** – retrieve program address space mappings

## LIBRARY

library “libdwarf”

## SYNOPSIS

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

*int*\

**dwarf\_get\_aranges**(*Dwarf\_Debug dbg*, *Dwarf\_Arange \*\*ar\_list*, *Dwarf\_Signed \*ar\_cnt*, *Dwarf\_Error \*err*);

## DESCRIPTION

The function **dwarf\_get\_aranges**() retrieves address range information from the “.debug\_aranges” DWARF section. Information about address ranges is returned using opaque descriptors of type *Dwarf\_Arange*,

Argument *dbg* should reference a DWARF debug context allocated using [dwarf\_init(3)](/dwarf_init/3.md).

Argument *ar\_list* should point to a location which will be set to a pointer to an array of *Dwarf\_Arange* descriptors.

Argument *ar\_cnt* should point to a location which will be set to the number of descriptors returned.

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

### Memory Management

The memory area used for the array returned in argument *ar\_list* is owned by library “libdwarf”. Application code should not attempt to directly free this area. Portable applications should instead use [dwarf\_dealloc(3)](/dwarf_dealloc/3.md) to indicate that the memory area may be freed.

## RETURN VALUES

Function **dwarf\_get\_aranges**() returns DW\_DLV\_OK when it succeeds. It returns DW\_DLV\_NO\_ENTRY if there is no “.debug\_aranges” section associated with the specified debugging context. In case of an error, it returns DW\_DLV\_ERROR and sets the argument *err*.

## EXAMPLES

To loop through all the address lookup table entries, use:

```
Dwarf_Debug dbg;
Dwarf_Addr start;
Dwarf_Arange *aranges;
Dwarf_Off die_off;
Dwarf_Signed i, cnt;
Dwarf_Unsigned length;
Dwarf_Error de;
if (dwarf_get_aranges(dbg, &aranges, &cnt, &de) != DW_DLV_OK)
	errx(EXIT_FAILURE, "dwarf_get_aranges: %s",
	    dwarf_errmsg(de));
for (i = 0; i < cnt; i++) {
	if (dwarf_get_arange_info(aranges[i], &start, &length,
	    &die_off, &de) != DW_DLV_OK) {
		warnx("dwarf_get_arange_info: %s",
		    dwarf_errmsg(de));
		continue;
	}
	/* Do something with the returned information. */
}
```

## ERRORS

Function **dwarf\_get\_aranges**() can fail with:

- \[DW\_DLE\_ARGUMENT\]

  One of the arguments *dbg*, *ar\_list* or *ar\_cnt* was NULL.

- \[DW\_DLE\_NO\_ENTRY\]

  The debugging context *dbg* did not contain a “.debug\_aranges” string section.

## SEE ALSO

[dwarf(3)](/dwarf/3.md), [dwarf\_get\_arange(3)](/dwarf_get_arange/3.md), [dwarf\_get\_arange\_cu\_header\_offset(3)](/dwarf_get_arange_cu_header_offset/3.md), [dwarf\_get\_arange\_info(3)](/dwarf_get_arange_info/3.md), [dwarf\_get\_cu\_die\_offset(3)](/dwarf_get_cu_die_offset/3.md)