nvme_ctrl_get_fd(2)

💅 nvme_ctrl_get_fd — libnvme API manual, bestie edition 💅

okay so real talk, this is the nvme_ctrl_get_fd(2) page from the libnvme API manual, and it's honestly short and sweet and I'm kind of obsessed. let's get into it 🎀

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✨ NAME ✨

nvme_ctrl_get_fd — get the associated file descriptor 👑

🦋 SYNOPSIS 🦋

int nvme_ctrl_get_fd (nvme_ctrl_t c );

like yes, that's the whole vibe. one argument, one int coming back at you. slay.

🌸 ARGUMENTS 🌸

• c — the controller instance. that's your girl right there, the controller object we're grabbing the fd from 💖

💫 DESCRIPTION 💫

okay so here's the tea, bestie. libnvme will open the file — but only if it's not already opened, no cap — and it keeps an internal copy of the file descriptor for you. it's giving "I already handled that, don't worry about it" energy ✨

so like, all the following calls to this API? they don't reopen anything. they just retrieve that internal cached copy of the file descriptor. it's literally just handing you back the same fd every time. iconic behavior, honestly.

and the file? it remains opened. the fd? it remains cached. it stays that way until one of two things happens:

1. the controller object gets deleted 🪦
2. nvme_ctrl_release_fd gets called 💀

that's it, that's the whole lifecycle. no surprise closes, no sneaky cleanup. periodt.

🫶 friendly reminder: nothing here closes the file for you behind your back — it just chills there until the controller dies or you explicitly release it. so if you were expecting the fd to pack up and leave on its own... bestie, it will not. 🙈

🔥 RETURN 🔥

• the file descriptor associated with c — yay, you got it 💖
• -1 — aka the sad path 😭

that's literally it. -1 or a real fd, no in-between, no grey area. very main character of it.

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and that's the page, bestie!! this little gem lives in the libnvme API manual and the whole thing is dated July 2026, filed under nvme_ctrl_get_fd and nvme_ctrl_get_fd(2) — so if you ever need to cite your sources in the group chat, that's the receipt 🧚💜