QB_RB_CHUNK_ALLOC(3)

💖 QB_RB_CHUNK_ALLOC — the "gimme some space bestie" page 💖

okay so this is libqb's programmer's manual, section 3 (library functions, iykyk), and today's main character is qb_rb_chunk_alloc. she's the one you call when you need a chunk of a ringbuffer and you need it now. 💅

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✨ NAME ✨

qb_rb_chunk_alloc — allocate space for a chunk of the given size. that's it, that's the whole job, and she does it flawlessly. 🎀

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🌸 SYNOPSIS 🌸

#include <qb/qbrb.h>

void * qb_rb_chunk_alloc(
    qb_ringbuffer_t   *rb,   /* ringbuffer instance */
    size_t             len   /* (in) the size to allocate. */
);

so you pull in <qb/qbrb.h> and boom, you got the whole ringbuffer situation. 🦋

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🫶 PARAMS 🫶

• rb — the ringbuffer instance. your girl. your ride or die. the actual buffer you're working with. ✨
• len (in) — the size to allocate. how much room you're asking for, in bytes. no cap. 💜

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💀 DESCRIPTION 💀

okay bestie, listen close because this part actually matters and it's giving caution:

if type == QB_RB_FLAG_OVERWRITE and NULL gets returned, then memory corruption of the memory file has occurred. like, the file is cooked. 😭 and what do you do about it? the ringbuffer should be destroyed. that's it, that's the move, no saving her. 🪦

if type == QB_RB_NORMAL then when there's not enough space, it'll just return NULL. chill. no drama. just a polite "nope, no room". 🙈

ngl the overwrite one is the scary one. treat that NULL like a fire alarm, not a typo. 🔥

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⭐ RETURN VALUE ⭐

a pointer to the chunk you get to write to. 👑 or NULL if there's no space. that's the vibe check, and sometimes she fails it. 💀

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🌈 SEE ALSO 🌈

the whole squad, fr fr:

• qb_rb_close(3)
• qb_rb_refcount_get(3)
• qb_rb_chmod(3)
• qb_rb_chown(3)
• qb_rb_open(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_read(3)

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💖 COPYRIGHT 💖

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

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and that's the whole page, bestie ✨ this little icon of a manpage comes to you from the libqb programmer's manual (section 3, library girlies only), dated 2025-09-16 — shoutout to the LIBQB source for keeping it real all these years. go allocate something cute. 🎀💅🦋