eventfd_fget(9)

💅 eventfd_fget — the Kernel API Manual, but make it make sense 🎀

okay so bestie, quick vibe check: this is a page from the Kernel API Manual, and we're talking about eventfd_fget. yes it sounds scary. no it is not. come sit with me, I gotchu 🫶

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✨ NAME ✨

eventfd_fget — Acquire a reference of an eventfd file descriptor.

like literally, it grabs you a reference. that's the whole job. iconic behavior honestly 👑

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🌸 SYNOPSIS 🌸

struct file * eventfd_fget (int fd );

there she is. returns a struct file *, takes one lonely int fd. no cap, that's it 🦋

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🎀 ARGUMENTS 🎀

• fd — [in] Eventfd file descriptor. that's your input, your little handle, the thing you're handing over so the function knows what to look at. give it a real one though, or see below 👀

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💖 DESCRIPTION 💖

so here's the tea: eventfd_fget returns a pointer to the eventfd file structure in case of success ✨. that's the good ending. main character energy.

but sometimes it doesn't slay, and instead of a file pointer you get one of these error pointers back:

• -EBADF — Invalid fd file descriptor. like the fd you passed? not valid. not it. 💀
• -EINVAL — The fd file descriptor is not an eventfd file. so it's a real fd, it's just not the right kind of fd. wrong vibe entirely 🙈

no third option, no secret mystery error. those are the two. check them, bestie, fr fr. an error pointer is still a pointer and dereferencing it would be a whole tragedy 😭

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🔥 SEE ALSO 🔥

• Kernel file ./fs/eventfd.c
• eventfd_signal_mask(9)
• eventfd_ctx_put(9)
• eventfd_ctx_remove_wait_queue(9)
• eventfd_ctx_fdget(9)
• eventfd_ctx_fileget(9)

the whole eventfd friend group, truly a squad 🌈

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and that's the page, bestie 💜 this gem comes from ./fs, dated October 2026, and it's filed under eventfd_fget(9) — go forth, acquire those references responsibly, and remember: valid fd or it's giving -EBADF 🍓✨