QB_RB_OPEN(3)

✨ QB_RB_OPEN ✨ — the libqb manual page, bestie edition 🎀

okay so you want to make a ring buffer?? in shared memory?? say less, this is the function for you. it lives in the libqb programmer's manual, section 3 (library calls, iykyk) 💅

---

🌸 NAME 🌸

qb_rb_open — create the ring buffer with the given type. periodt. 💖

---

🦋 SYNOPSIS 🦋

#include <qb/qbrb.h>

qb_ringbuffer_t * qb_rb_open(
    const char   *name,                   /* the unique name of this ringbuffer. */
    size_t        size,                   /* the requested size. */
    uint32_t      flags,                  /* or'ed flags */
    size_t        shared_user_data_size   /* size for a shared data area. */
);

like... look at her. four args. iconic. 👑

---

💜 PARAMS 💜

• name — the unique name of this ringbuffer. yes it has to be unique, no you can't just name it whatever twice, bestie 😭
• size — the requested size. "requested" is doing a LOT of work in that sentence, we'll get to that 👀
• flags — or'ed flags. as in, bitwise-OR them together. stack 'em. 🔥
• shared_user_data_size — size for a shared data area. a lil extra scratch space you can share, cute 🫶

---

🌈 DESCRIPTION 🌈

so basically this creates — and allocates — a ring buffer, and it does it in shared memory. that's the whole vibe. it's giving "several processes, one buffer, chaos but make it efficient" ✨

---

⭐ RETURN VALUE ⭐

you get back a shiny new ring buffer 🎉 ... OR NULL if there was a problem 💀

(if you got NULL, that's your sign. go check stuff. do not pass go.)

---

🙈 NOTE 🙈

the actual size will be rounded up to the next page size. so if you asked for a weird size, you're getting a page-aligned size instead. it's not lying to you, it's just... rounding up. main character energy fr fr 💅

---

🧚 SEE ALSO 🧚

the whole girl gang, go read these too:

• qb_rb_close(3)
• qb_rb_refcount_get(3)
• qb_rb_chmod(3)
• qb_rb_chown(3)
• qb_rb_write_to_file(3)
• qb_rb_create_from_file(3)
• qb_rb_chunks_used(3)
• qb_rb_chunk_reclaim(3)
• qb_rb_space_used(3)
• qb_rb_chunk_write(3)
• qb_rb_shared_user_data_get(3)
• qb_rb_chunk_commit(3)
• qb_rb_chunk_peek(3)
• qb_rb_space_free(3)
• qb_rb_name_get(3)
• qb_rb_chunk_alloc(3)
• qb_rb_chunk_read(3)

---

👑 COPYRIGHT 👑

Copyright (C) 2010-2020 Red Hat, Inc.

---

okay bestie that's the whole page, slay 💖 this was the libqb manual, version dated 2025-09-16, brought to you by the libqb girlies at Red Hat 🎀 go forth and ring-buffer responsibly. mwah 💋 bye!!