libnvme(9)

💅 libnvme(9) — API Manual, but make it make sense

okay bestie, welcome to the libnvme API manual, page 9, and today's main character is a little enum that's way more important than it looks. it lives in section 9 of the manual, and it's about Key Per I/O Capabilities — yes, that's the NAME, and yes, it ate. 🔑

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✨ NAME ✨

enum nvme_id_ctrl_kpioc — Key Per I/O Capabilities

like, it's an enum. it holds the capabilities. for keys. per I/O. the name really said "no notes" and left it at that. 🎀

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🌸 SYNOPSIS 🌸

here's the whole vibe, verbatim, don't touch the formatting or she'll get mad:

enum nvme_id_ctrl_kpioc {
    NVME_CTRL_KPIOC_KPIOS_SHIFT ,
    NVME_CTRL_KPIOC_KPIOSC_SHIFT ,
    NVME_CTRL_KPIOC_KPIOS_MASK ,
    NVME_CTRL_KPIOC_KPIOSC_MASK

};

four constants. that's the whole enum. small but mighty fr fr 💪

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🦋 Constants 🦋

okay so these are the four icons of the group chat, and every single one of them wants to help you pull something out of the struct nvme_id_ctrl.kpioc field. that field is the source of truth, and these constants are the little crowbars. 🧚

• NVME_CTRL_KPIOC_KPIOS_SHIFT — the shift amount you use to get the Key Per I/O Supported value out of the struct nvme_id_ctrl.kpioc field. shift it, slay it, done. ✨
• NVME_CTRL_KPIOC_KPIOSC_SHIFT — the shift amount you use to get the Key Per I/O Scope out of the struct nvme_id_ctrl.kpioc field. it's the scope one, not the supported one — do not mix them up, i'm begging 🫶
• NVME_CTRL_KPIOC_KPIOS_MASK — the mask you use to get the Key Per I/O Supported value out of the struct nvme_id_ctrl.kpioc field. mask on, extract, serve. 💅
• NVME_CTRL_KPIOC_KPIOSC_MASK — the mask you use to get the Key Per I/O Scope out of the struct nvme_id_ctrl.kpioc field. that's the scope mask, bestie. the scope one. 😭

quick little recap because i love you: KPIOS = Key Per I/O Supported, KPIOSC = Key Per I/O Scope, SHIFT = shift amount, MASK = mask, and all four are read out of the struct nvme_id_ctrl.kpioc field. that's it, that's the whole lore. no cap. 🔥

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💜 and that's the tea

that's genuinely the whole page — four constants, one struct field, zero drama. ngl this is one of those quiet little enums that's just out here doing its job with main character energy and no credit. 👑

anyway, mwah, this page came from libnvme, API Manual, section 9, dated October 2026, and its official manpage name is enum nvme_id_ctrl_kpioc — so if you ever need to cite her, that's what you call her. 🍓 bye bestie, go shift some bits 💖🌈