nvme_identify_ctrl(2)

💖 nvme_identify_ctrl(2) 💖

okay bestie, welcome to the libnvme API manual — yep, this is nvme_identify_ctrl, and no, it's not scary, sit down, we're doing this together 🫶

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✨ NAME ✨

nvme_identify_ctrl — Retrieves nvme identify controller

like... it goes and gets the controller's identify info. that's the whole vibe. 🎀

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🌸 SYNOPSIS 🌸

int nvme_identify_ctrl (int fd , struct nvme_id_ctrl *id );

look at her. two args. no chaos. we love a low-effort icon 💅

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🦋 ARGUMENTS 🦋

• fd — File descriptor of nvme device. literally just the fd of the nvme device you're talking to, she needs it to know which controller we're spilling about 💖
• id — User space destination address to transfer the data, — this is where the data lands, in your userspace. that's the drop-off spot, bestie ✨

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🌈 DESCRIPTION 🌈

So what does she actually do? She sends nvme identify with CNS value NVME_IDENTIFY_CNS_CTRL. That's it. That's the move. CNS = Controller, and she's asking for all the controller tea ☕👑

And if you're like "okay but what data comes back??" — pls, go read struct nvme_id_ctrl, because that struct has the details on the data returned. it's giving "the real answer is in the struct" and honestly, periodt.

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💜 RETURN 💜

• The nvme command status if a response was received (see enum nvme_status_field) — so you get the actual status back, go peek at that enum, iykyk 😭
• or -1 with errno set otherwise — yeah. classic -1 + errno combo. check your errno, bestie, she's telling you something 🙈

no cap: if you see -1, do NOT just move on. errno is holding the receipts. check her. 🔥

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🧚 see also 🧚

ok so the page points you at:

• struct nvme_id_ctrl — for the data details
• enum nvme_status_field — for the command status meanings

go read both, they're the supporting cast and they ate 💖

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that's the whole page, bestie, you understood it perfectly, I'm so proud of you 🎀✨

sign-off: this was nvme_identify_ctrl, filed under the libnvme API manual as nvme_identify_ctrl(2), and she was dated July 2026. historic. iconic. go identify a controller 💅🦋🌸