io_uring_buf_ring_advance(3)

✨ io_uring_buf_ring_advance ✨

okay bestie, so this one lives in the liburing Manual and it's giving short but mighty 🎀 like it's literally three lines of actual behavior but the whole buffer ring economy depends on it, no cap.

💖 NAME 💖

io_uring_buf_ring_advance — advance index of provided buffer in buffer ring

like... you're moving the lil pointer forward so the kernel can finally see the snacks you put on the plate 🍓

🌸 SYNOPSIS 🌸

#include <liburing.h>

void io_uring_buf_ring_advance(struct io_uring_buf_ring *br,
                               int count);

🦋 DESCRIPTION 🦋

so the tea is: io_uring_buf_ring_advance(3) commits count previously added buffers to the shared buffer ring br.

committing = you're making them visible to the kernel, and that's the whole point, because once the kernel can see them they're consumable. 👑

and the part that matters most, bestie, is that this passes ownership of the buffer to the ring. so like. those buffers are not yours anymore. they're the ring's now. it's giving ✨ custody transfer ✨.

think of it like: io_uring_buf_ring_add is you loading the dishwasher 🫧 and io_uring_buf_ring_advance is you pressing start and walking away. you don't get to keep reaching in there after that. 💅

⭐ RETURN VALUE ⭐

None

like. nothing. zero. void. it just does the thing and leaves, main character energy, no receipts. 🙈

🌈 SEE ALSO 🌈

• io_uring_register_buf_ring(3)
• io_uring_buf_ring_add(3)
• io_uring_buf_ring_cq_advance(3)

(these three are the friend group. you don't do advance without knowing add, and cq_advance is the cousin that does the same vibe on the completion side. iykyk 🧚)

lowkey important reminder: count is the number of buffers you're committing, and br is the shared ring you're committing them to. don't mix those up, bestie, the vibes will be off and the kernel will simply not see your buffers 😭

and that's the whole page!! brought to you by liburing-2.2, dated May 18, 2022 💜 mwah, go commit those buffers, you're doing amazing sweetie 🌸✨🦋💖