seq_buf_hex_dump(9)

📦 version 7.3.1, in nixpkgs unstable

✨ seq_buf_hex_dump ✨

okay bestie, so this page is from the Kernel API Manual — it's seq_buf_hex_dump(9), and no cap, it's literally just a glow-up machine that prints a formatted hex dump straight into your sequence buffer 🎀

🌸 NAME 🌸

seq_buf_hex_dump — print formatted hex dump into the sequence buffer 💅

🦋 SYNOPSIS 🦋

int seq_buf_hex_dump (struct seq_buf *s , const char *prefix_str , int
prefix_type , int rowsize , int groupsize , const void *buf , size_t len
, bool ascii );

🎀 ARGUMENTS 🎀

  • s — the seq_buf descriptor. this is your main character, the buffer everything's getting dumped into 🫶
  • prefix_str — the string you want prefixed onto every single line. and bestie, you're the one responsible for adding trailing spaces if you want the lines to line up all pretty — it does not do that for you, periodt ✨
  • prefix_type — this one controls whether a prefix of an offset, an address, or literally nothing gets printed. your options are DUMP_PREFIX_OFFSET, DUMP_PREFIX_ADDRESS, or DUMP_PREFIX_NONE 🔥
  • rowsize — how many bytes get printed per line. heads up: must be 16 or 32, no in-between vibes 🙈
  • groupsize — how many bytes get printed at a time. the valid ones are 1, 2, 4, 8, and the default is 1 ⭐
  • buf — the data blob you're dumping. the moment itself 💖
  • len — how many bytes are in buf (like, the actual count, not vibes) 🌸
  • ascii — whether to include the ASCII after the hex output. set it and you get the cute little ASCII column too 👑

💜 DESCRIPTION 💜

So this function is basically an analogue of print_hex_dump, which means it's got a similar interface — same energy, different buffer. iykyk 😭

now for the math part, stay with me:

  • linebuf size is the maximal length for one line 💀
  • 32 * 3 — maximum bytes per line, each printed into 2 chars + 1 for separating space
  • 2 — spaces separating hex dump and ASCII representation
  • 32 — ASCII representation
  • 1 — terminating ' '

it's giving very "trust the process" but it does add up, fr fr 🧚

🌈 RETURN 🌈

  • zero on success 💅
  • -1 on overflow 😭
fr fr, check that return value — an overflow means your dump did not fully make it in, and that's not the slay you want 🫶

⭐ SEE ALSO ⭐

Kernel file ./lib/seq_buf.c plus the whole seq_buf friend group — go say hi:

and that's the whole page, bestie 🎀 this one lives in ./lib, it's dated October 2026, and the source/version line says seq_buf_hex_dump(9) — so like, screenshot it, cite it, love it, mwah 💖✨🦋

📦 where this page comes from