sync_file_get_fence(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sync_file_get_fence(9) — like, the Kernel API Manual page, but make it make sense

Okay bestie, gather round, because this is a page from the Kernel API Manual and it's honestly short and sweet — we're talking about sync_file_get_fence, which is the little function whose whole job is grabbing the fence that lives inside a sync_file fd. Iconic behavior, no notes. 🎀

✨ NAME ✨

sync_file_get_fence — get the fence related to the sync_file fd 🦋

✨ SYNOPSIS ✨

struct dma_fence * sync_file_get_fence (int fd );

Like, look at her. Returns a struct dma_fence *, takes one int fd, and the whole thing is basically a drive-thru window for fences. 🍓

✨ ARGUMENTS ✨

  • fd — the sync_file fd you wanna pull the fence out of, bestie. That's it, that's the argument. 🫶

✨ DESCRIPTION ✨

So here's the vibe: this function makes sure that fd actually references a valid sync_file — yes, it does a whole little security check at the door, we love a queen who verifies — and then it returns a fence that represents all fence in the sync_file. Not some of the fence. All of them. Main character fence energy. 👑

And on error? NULL gets returned. That's the whole deal. So bestie, please check for NULL, because that's how she tells you it didn't work out. 😭

fr fr — no error code, no fancy struct, just NULL. Keep that in mind or you're gonna have a bad time.

✨ SEE ALSO ✨

Go touch some grass in the kernel source, specifically this file:

  • Kernel file ./drivers/dma-buf/sync_file.c — the home base for all of this 🌸

And these related stars of the show, who are also absolutely worth your time:

That's the whole page, babes. Short, iconic, zero filler — the way that a manpage should be. Anyway, it lives under ./drivers/dma-buf and this edition is dated October 2026, so, like, mark your calendar or whatever. Mwah 💋💖

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