nvme_get_log_cmd_effects(2)

✨ nvme_get_log_cmd_effects ✨

okay bestie, so this is a page from the libnvme API manual — section 2, the syscall/library-function zone 💅 — and it's about the function nvme_get_log_cmd_effects, which 🥁 retrieves the nvme command effects log. Yes queen, we're going log-diving.

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🌸 SYNOPSIS 🌸

int nvme_get_log_cmd_effects (int fd , enum nvme_csi csi , struct
nvme_cmd_effects_log *effects_log );

like. look at her. three little arguments and she returns an int. icon behavior.

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🎀 ARGUMENTS 🎀

• fd — the file descriptor of your nvme device 🫶 the lil handle that says "yes this one, this drive right here"
• csi — the Command Set Identifier 👑 it tells the function which command set you're asking about
• effects_log — the user address where the effects log gets stored 💾 you bring the bucket, she fills the bucket

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🦋 DESCRIPTION 🦋

so the way that this works is: this log page describes the commands that the controller supports, AND the effects of those commands on the state of the NVM subsystem. ✨

like, it's not just "here's what I can do" — it's "here's what I can do and here's what happens to the whole NVM subsystem when I do it". main character energy fr fr. no cap, that's the entire vibe of this log page.

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⭐ RETURN ⭐

she gives you back the nvme command status if a response was received — check enum nvme_status_field for what those mean, iykyk 🌈

and if not? -1 with errno set. 😭 the classic "something went wrong and we're telling you via errno" move. periodt.

lowkey important: a -1 return is not an nvme command status, it's the "no response happened / other error" path, and errno is where the actual tea is ☕

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💖 SEE ALSO 💖

• enum nvme_status_field — go read it, bestie, that's where the status codes live 🔥

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that's the whole page, bestie 🧚 it's giving "small function, big responsibility". go log some effects. slay 💅

— with love, from the libnvme API manual, nvme_get_log_cmd_effects(2), dated July 2026 🎀