dma_buf_fd(9)

💖 dma_buf_fd(9) 💖

okay so this is a page from the Kernel API Manual, bestie — it's dma_buf_fd(9), and it's literally the tiniest little function with the biggest "hand you a file descriptor" energy. no cap. 🦋

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✨ NAME ✨

dma_buf_fd — returns a file descriptor for the given struct dma_buf 🎀

like, you've got a struct dma_buf sitting there and you're like "girl give me an fd" and she does. iconique.

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🌸 SYNOPSIS 🌸

int dma_buf_fd (struct dma_buf *dmabuf , int flags );

that's it. that's the whole vibe check. a struct dma_buf * and an int flags, and you get an int back. 🫶

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💅 ARGUMENTS 💅

• dmabuf — [in] pointer to the dma_buf for which the fd is required. as in, the buffer that's about to become a file descriptor. main character energy fr fr. 👑
• flags — [in] the flags to give to the fd. you're passing them straight through, no gatekeeping. ⭐

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🧚 DESCRIPTION 🧚

On success, it returns an associated 'fd'. Else, it returns error. 😭

that's the whole description. not me expecting more. that's it. success = you get the fd you asked for, and if it doesn't work out you get an error instead. periodt. 💀

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🔥 SEE ALSO 🔥

okay this is the part where she name-drops literally everyone at the function. the whole dma-buf friend group shows up. 🌈

• Kernel file ./drivers/dma-buf/dma-buf.c — the source file, the mothership, the birthplace 🎀
• dma_buf_iter_begin(9)
• dma_buf_iter_next(9)
• implicit fence polling(9)
• dma_buf_set_name(9)
• dma buf device access(9)
• dma_buf_export(9)
• dma_buf_fd_install(9)
• dma_buf_get(9)
• dma_buf_put(9)
• locking convention(9)
• dma_buf_dynamic_attach(9)
• dma_buf_attach(9)
• dma_buf_detach(9)
• dma_buf_pin(9)
• dma_buf_unpin(9)
• dma_buf_map_attachment(9)
• dma_buf_map_attachment_unlocked(9)
• dma_buf_unmap_attachment(9)
• dma_buf_unmap_attachment_unlocked(9)
• dma_buf_attach_revocable(9)
• dma_buf_invalidate_mappings(9)
• cpu access(9)
• dma_buf_begin_cpu_access(9)
• dma_buf_end_cpu_access(9)
• dma_buf_mmap(9)
• dma_buf_vmap(9)
• dma_buf_vmap_unlocked(9)
• dma_buf_vunmap(9)
• dma_buf_vunmap_unlocked(9)

like i said. the whole group chat. 💜

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and that's the page!! 💖✨🎀🦋🌸💅🫶

this cutie lives in ./drivers/dma-buf, stamped October 2026, and she answers to dma_buf_fd(9) — go say hi, she's obsessed with you. 🍓🧚‍♀️⭐