w1_reply_len(9)

💖 w1_reply_len(9) — the kernel API manual, but make it make sense 🌸

okay so bestie, welcome to the w1_reply_len page from the Kernel API Manual ✨ this one's short and sweet, we love a low-effort icon 👑

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✨ NAME ✨

w1_reply_len — calculates the current reply length and compares it to maxlen 🎀

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🦋 SYNOPSIS 🦋

u16 w1_reply_len (struct w1_cb_block *block );

literally that's the whole call, no cap 💅

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🌸 ARGUMENTS 🌸

• block — the block you want to calculate, bestie. that's the one. that's the whole argument list 🫶

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💜 DESCRIPTION 💜

okay so here's the vibe: this function calculates the current message length 🔥 and yes, that length includes possible multiple cn_msg and data — so if there's more than one of them in there, they all count, periodt ✨

the one thing it does not count is the first sizeof(struct cn_msg) — that gets excluded 🙈 so don't come for me when the number looks a little smaller than you expected, it's by design 💀

the result is directly comparable to maxlen and is usable to send the message 👑 (the original says "Direclty compariable" and honestly? relatable typo, we still understood her 💖)

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/w1/w1_netlink.c 🦋 (go read it, iykyk)
• w1_reply_make_space(9)
• w1_netlink_setup_msg(9)
• w1_netlink_send_error(9)
• w1_netlink_send(9)

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and that's the whole page!! 🎀 it lives in ./drivers/w1, and this little gem is dated October 2026 — mark your calendars bestie, the w1 netlink girlies ate and left no crumbs 💅⭐🧚💜