llc_circular_between(9)

💅 llc_circular_between — a Kernel API Manual moment

okay bestie, welcome to the Kernel API Manual, section 9, where we talk about one (1) tiny function that does circular math and honestly ate 💖

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✨ NAME ✨

llc_circular_between — the little guy that decides whether b is sitting between a and c, or not. that's it. that's the whole job. 🎀

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🌸 SYNOPSIS 🌸

u8 llc_circular_between (u8 a , u8 b , u8 c );

three u8s in, one u8 out. no cap. 🦋

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🧚 ARGUMENTS 🧚

• a — the lower bound, aka the start of the vibe zone 💜
• b — the element we're checking to see if it's between a and b (yes, fr fr, that's literally what the page says — b is the one under investigation 🔍)
• c — the upper bound, the end of the zone, the finish line ⭐

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🔥 DESCRIPTION 🔥

so the whole point: this function designates whether b is between a and c or not. and because it's circular, the wrap-around case counts too — the page's own example is that 0 is between 127 and 1. iconic, honestly. the number line just looped around and said "i contain multitudes" 🌈

it returns 1 if b is between a and c, and 0 otherwise. binary queen. periodt. 👑

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🫶 SEE ALSO 🫶

the page points you at Kernel file ./net/llc/llc_c_ac.c, plus this whole friend group of 9-section besties:

• llc_conn_ac_send_ack_if_needed(9)
• llc_conn_ac_rst_sendack_flag(9)
• llc_conn_ac_send_i_rsp_f_set_ackpf(9)
• llc_conn_ac_send_i_as_ack(9)
• llc_conn_ac_send_rr_rsp_f_set_ackpf(9)
• llc_conn_ac_inc_npta_value(9)
• llc_conn_ac_adjust_npta_by_rr(9)
• llc_conn_ac_adjust_npta_by_rnr(9)
• llc_conn_ac_dec_tx_win_size(9)
• llc_conn_ac_inc_tx_win_size(9)
• llc_conn_disc(9)
• llc_conn_reset(9)
• llc_process_tmr_ev(9)

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that's the tea 💅 this one came out of ./net/llc back in October 2026, and yeah — that's the version and the date, so you know exactly which era of kernel lore you're reading. go be between some bounds, bestie 💖✨