libnvmf_add_ctrl(9)

💅 libnvmf_add_ctrl(9) — like, the libnvme API manual, but make it make sense 🎀

okay bestie, gather round, because this one is genuinely a little glow-up function and i need you to understand it. it lives in the libnvme API manual, it's called libnvmf_add_ctrl, and it does exactly one iconic thing: connects a controller and updates the topology. that's the whole vibe. no cap.

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✨ NAME ✨

libnvmf_add_ctrl — connect a controller and update topology 🦋

like... that's it. that's the job. connect the thing, then make the topology aware that the thing exists. lowkey elegant.

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🌸 SYNOPSIS 🌸

int libnvmf_add_ctrl (struct libnvme_host *h , struct libnvme_ctrl *c );

two parameters, one int coming back at you. she's compact. she's tidy. she knows what she wants. 💅

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🫶 ARGUMENTS 🫶

• h — the host 🏠 and yes, this is the one the controller should be attached to. think of it as the parent, the home base, the main character of the topology tree. the controller moves in with h.
• c — the controller 🔌 that's getting connected. this is the one doing the whole "hi i'd like to join the network" moment.

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🔥 DESCRIPTION 🔥

okay so here's the actual tea ☕: this function issues a 'connect' command to the NVMe-oF controller, and then it inserts c into the topology using h as parent.

read that again. two things. one function. she ate. 💀

so c gets connected and gets placed into the topology tree under h, which is honestly the polite thing to do — you don't just show up to the group chat, you show up and introduce yourself.

⚠️ but listen, bestie, there are rules: c must be initialized and it must not be connected to the topology already. that's not a suggestion, that's a requirement. don't be sending me an uninitialized controller, and don't be sending me one that's already linked up. the function is not here to fix your situationship with the topology. 🙈

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⭐ RETURN ⭐

• 0 on success 🎉 — she slayed, she connected, she's in the topology.
• a negative error code otherwise 😭 — something went sideways, and the number coming back will be negative about it.

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and that's the whole page, bestie. no forty-option wall of flags, no secret environment variables, no signals, no bug caveats hiding at the bottom — just two args, one connect command, one topology insert, and one very clear "don't pre-connect it" warning. we love a short manpage. 👑

💖 that's the libnvmf_add_ctrl experience, brought to you by the libnvme API manual, dated October 2026 — catch you in the next page, mwah 💖