DWARF_VENDOR_EXT(3)

💅 DWARF_VENDOR_EXT(3) — like, the libdwarf manual, bestie

okay so real talk, this is a page from the Library Functions Manual for DWARF_VENDOR_EXT(3) and it's genuinely so niche and so cute. sit down, grab a strawberry 🍓, and let me tell you about adding vendor-specific macro info to your DWARF producer. no cap, it's giving "small function, big responsibility."

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🎀 LIBRARY

DWARF Access Library — that's libdwarf, and you link it with -ldwarf. slay.

✨ SYNOPSIS

#include <libdwarf.h>

int
dwarf_vendor_ext(Dwarf_P_Debug dbg, Dwarf_Unsigned constant,
    char *string, Dwarf_Error *err);

like, that's the whole signature. look at it. iconic. 👑

🦋 DESCRIPTION

Function dwarf_vendor_ext() adds a vendor-specific macro information entry to a DWARF producer instance. that's the whole vibe. it's literally the entire job of this function and honestly good for it.

Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3). so like, don't just pass it a random pointer, bestie, that's not the move 🙈. it needs to come from one of those two init functions.

Argument constant specifies a constant value for the macro information entry. yes queen, give us that number.

Argument string point to a NUL-terminated string containing the string value for the macro information entry. NUL-terminated. as in, ends with a \0. as in, the string knows when to stop talking (unlike me). 🫶

If argument err is not NULL, it will be used to store error information in case of an error. and if you pass NULL there? then no error info for you, and you'll just be sitting there like 😭 wondering what went wrong.

ok this part is important so pay attention: the meaning of the arguments constant and string are not defined by the DWARF specification, but are instead governed by application and vendor conventions. so like, the spec literally said "not my problem, figure it out with your vendor." the vibes are extremely "iykyk." 🔥

💖 RETURN VALUES

On success, function dwarf_vendor_ext() returns DW_DLV_OK. that's the good ending. ✨

In case of an error, function dwarf_vendor_ext() returns DW_DLV_ERROR and sets the argument err. that's the bad ending, but at least err tells you why (assuming you didn't pass NULL, which, again, 😭).

💀 ERRORS

Function dwarf_vendor_ext() can fail with:

• [DW_DLE_ARGUMENT] — Either arguments dbg or string was NULL. like bestie, you have to actually give it a producer instance and a string. the bare minimum.
• [DW_DLE_MEMORY] — An out of memory condition was encountered during the execution of the function. it ran out of RAM mid-glow-up, devastating, no notes 🌸.

🌈 SEE ALSO

• dwarf(3)
• dwarf_def_macro(3)
• dwarf_end_macro_file(3)
• dwarf_producer_init(3)
• dwarf_producer_init_b(3)
• dwarf_start_macro_file(3)
• dwarf_undef_macro(3)

like the whole macro-file friend group honestly. go read them, they're all so valid 💜

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and that's the page, bestie!! this little icon was brought to you by Debian, dated September 25, 2011 — yes she's been serving this exact same energy since 2011, main character longevity fr fr. mwah 💅✨