eventfd_ctx_fileget(9)

✨ eventfd_ctx_fileget ✨

okay bestie, welcome to the Kernel API Manual page for eventfd_ctx_fileget(9) — yes, it's giving kernel-internals realness 💅

💖 NAME 💖

eventfd_ctx_fileget — acquires a reference to the internal eventfd context. that's literally the whole vibe ✨

🌸 SYNOPSIS 🌸

struct eventfd_ctx * eventfd_ctx_fileget (struct file *file );

🦋 ARGUMENTS 🦋

• file — [in] Eventfd file pointer. lowkey the file pointer you're bringing to the function 🫶

🎀 DESCRIPTION 🎀

okay so here's the tea: eventfd_ctx_fileget returns a pointer to the internal eventfd context, and it acquires a reference while doing it. if it can't do that, you get the error pointer instead 😭

the specific error situation listed here is:

• -EINVAL — The fd file descriptor is not an eventfd file.

so yeah — if file is not an eventfd file, that's a -EINVAL moment, no cap 💀

👑 SEE ALSO 👑

Kernel file ./fs/eventfd.c — and the whole friend group:

• eventfd_signal_mask(9)
• eventfd_ctx_put(9)
• eventfd_ctx_remove_wait_queue(9)
• eventfd_fget(9)
• eventfd_ctx_fdget(9)

mwah 💋 this cutie's footer says source ./fs, date October 2026, and title eventfd_ctx_fileget(9) — byeee, slay 🫶✨