kfifo_len(9)

💅 kfifo_len — Kernel API Manual (9) ✨

okay bestie, welcome to kfifo_len(9) — a manual page from the Kernel API Manual, and honestly? it's a short one but it serves. 🎀

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✨ NAME ✨

kfifo_len — literally returns the number of used elements in the fifo. that's it. that's the whole job. no cap. 💖

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🦋 SYNOPSIS 🦋

kfifo_len (fifo );

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🌸 ARGUMENTS 🌸

• fifo — the address of the fifo to be used. like, hand her the fifo and she'll tell you how much of it is currently occupied. 💅

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🫶 SEE ALSO 🫶

the kernel file ./include/linux/kfifo.h — and bestie, the whole kfifo friend group is here, it's giving family reunion 😭:

• DECLARE_KFIFO_PTR(9)
• DECLARE_KFIFO(9)
• INIT_KFIFO(9)
• DEFINE_KFIFO(9)
• kfifo_initialized(9)
• kfifo_esize(9)
• kfifo_recsize(9)
• kfifo_size(9)
• kfifo_reset(9)
• kfifo_reset_out(9)
• kfifo_is_empty(9)
• kfifo_is_empty_spinlocked(9)
• kfifo_is_empty_spinlocked_noirqsave(9)
• kfifo_is_full(9)
• kfifo_avail(9)
• kfifo_skip_count(9)
• kfifo_skip(9)
• kfifo_peek_len(9)
• kfifo_alloc(9)
• kfifo_alloc_node(9)
• kfifo_free(9)
• kfifo_init(9)
• kfifo_put(9)
• kfifo_get(9)
• kfifo_peek(9)
• kfifo_in(9)
• kfifo_in_spinlocked(9)
• kfifo_in_spinlocked_noirqsave(9)
• kfifo_out(9)
• kfifo_out_spinlocked(9)
• kfifo_out_spinlocked_noirqsave(9)
• kfifo_from_user(9)
• kfifo_to_user(9)
• kfifo_dma_in_prepare_mapped(9)
• kfifo_dma_in_finish(9)
• kfifo_dma_out_prepare_mapped(9)
• kfifo_dma_out_finish(9)
• kfifo_out_peek(9)
• kfifo_out_linear(9)
• kfifo_out_linear_ptr(9)

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💀 reminder bestie: every one of those is a real page, spelled exactly like that. don't be out here typoing kfifo_is_empty_spinlocked_noirqsave in front of company 🙈

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🌈 and that's the whole page, periodt. this one came from ./include/linux, dated October 2026 — mwah, slay, see you in the next manpage 💜👑