nvme_get_ctrl_telemetry(2)

💖 nvme_get_ctrl_telemetry — bestie, we're getting the controller telemetry log 💖

okay so like. this is a page from the libnvme API manual and it's genuinely so useful, i'm obsessed. sit down, grab a strawberry 🍓, and let's get into it.

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✨ NAME ✨

nvme_get_ctrl_telemetry — get controller telemetry log 🦋

like. it gets the controller telemetry log. that's the whole vibe. no cap.

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🎀 SYNOPSIS 🎀

int nvme_get_ctrl_telemetry (int fd , bool rae , struct
nvme_telemetry_log **log , enum nvme_telemetry_da da , size_t *size );

look at her. five args. main character energy honestly. 👑

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🌸 ARGUMENTS 🌸

• fd — file descriptor of the nvme device. your little handle on the hardware, the way into the whole situation 💅
• rae — retain asynchronous events. exactly that, don't overthink it ✨
• log — on success, this gets set to the value of the allocated and retrieved log. so it's an output, bestie, she gives you the log 🫶
• da — the log page data area. valid values live in enum nvme_telemetry_da — pls use those and not vibes 🌈
• size — pointer to the telemetry log size, so it can be returned. she needs somewhere to hand the size back to you, okay 😭

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💜 DESCRIPTION 💜

so here's the math, and honestly it's not even that scary. the total size allocated can be calculated as:

(nvme_telemetry_log da size + 1) * NVME_LOG_TELEM_BLOCK_SIZE

that's it. that's the formula. keep every character of it, periodt. ⭐

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🔥 RETURN 🔥

she returns the nvme command status if a response was received — see enum nvme_status_field for the whole lore on that one. and if not? she returns -1 with errno set. so like, check your errno, bestie, she's telling you something 💀

lowkey important: -1 + errno means no response came back at all, so don't go looking for a status field that isn't there. 🙈

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okay that's the whole page! from the libnvme API manual, nvme_get_ctrl_telemetry section, dated July 2026 — ty for reading, you ate that, slay, bye 💖✨🎀