DWARF_GET_ELF(3)

💅 DWARF_GET_ELF(3) 💅

okay so bestie, welcome to the DWARF_GET_ELF page — it's from the Library Functions Manual (that's the manual name, iykyk) and honestly it's a short little icon. let's get into it ✨

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🌸 NAME 🌸

dwarf_get_elf — retrieve the Elf descriptor associated with a Dwarf_Debug instance

like, you have a dwarf thing, you want the elf thing that goes with it? that's the whole vibe. 🧚

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🎀 LIBRARY 🎀

DWARF Access Library (libdwarf, -ldwarf)

link it with -ldwarf, no cap. 🔥

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✨ SYNOPSIS ✨

#include <libdwarf.h>

int
dwarf_get_elf(Dwarf_Debug dbg, Elf **elf, Dwarf_Error *err);

there she is. three args, returns an int, header is libdwarf.h. copy it exactly, bestie, don't freestyle it 💖

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🦋 DESCRIPTION 🦋

So function dwarf_get_elf() returns the Elf descriptor associated with a Dwarf_Debug instance. literally it's the "get me the elf that matches my dwarf" function. lowkey iconic. 👑

Argument dbg should be a handle to a valid Dwarf_Debug instance returned by a prior call to dwarf_init(3) or dwarf_elf_init(3). so like — you gotta have a real dbg first, don't just make one up 🙈

Argument elf points a location into which a handle to an Elf descriptor will be written. it's an out-param, so you pass &elf, not elf. classic. ⭐

Argument err is used to record error information in case of failure. if things go sideways, this is where the tea gets spilled 😭

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💀 RETURN VALUES 💀

On success, function dwarf_get_elf() returns DW_DLV_OK. slay. 🎀

In case of an error, it returns DW_DLV_ERROR and sets argument err. so check that return value fr fr — DW_DLV_OK or bust 💅

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🌈 EXAMPLES 🌈

To retrieve the Elf instance associated with a Dwarf_Debug instance use:

Dwarf_Debug dbg;
Dwarf_Error de;
Elf *elf;

... allocate dbg using dwarf_init() etc ...

if (dwarf_get_elf(dbg, &elf, &de) != DW_DLV_OK)
        errx(EXIT_FAILURE, "dwarf_get_elf: %s", dwarf_errmsg(de));

see how it's &elf and &de? pointers to your out-params, bestie. the errx + dwarf_errmsg(de) combo is chef's kiss — that's how you actually find out what went wrong instead of just vibing in the dark 😭🔥

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🫶 SEE ALSO 🫶

• dwarf(3)
• dwarf_errmsg(3)
• dwarf_finish(3)
• dwarf_init(3)
• elf(3)

go read dwarf_init(3) next if you haven't — like, you literally need it to even get a dbg. main character energy. 👑

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quick vibe check 🍓: none of this works unless dbg came from a real dwarf_init(3) or dwarf_elf_init(3) call first. no fake handles, no shortcuts.

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and that's the page!! 💖✨🎀 this little gem is from Debian, dated November 9, 2011, and the page itself is DWARF_GET_ELF(3) — mwah, go get that elf descriptor bestie 🦋💜