tee_client_open_context(9)

💅 tee_client_open_context(9) — like, the kernel API manual, but make it make sense 🎀

okay bestie so you found yourself in the Kernel API Manual section, specifically the page for tee_client_open_context — and honestly? This one's a little cutie. Not scary at all. Let's get into it 🫶

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✨ NAME ✨

tee_client_open_context — open a TEE context. that's it. that's the whole vibe. 💖

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🌸 SYNOPSIS 🌸

struct tee_context * tee_client_open_context (struct tee_context *start
, int (*match)(struct tee_ioctl_version_data *, const void *) , const
void *data , struct tee_ioctl_version_data *vers );

copy it exactly like that, no cap — those are the real argument types, don't be out here improvising 😭

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🦋 ARGUMENTS 🦋

• start — if this isn't NULL, you're basically telling it "keep looking, bestie, start your search after this context." like scrolling past the ones you already matched with 💅
• match — your callback function, the little vibe check that decides whether a TEE device is the one. it gets called to check the device.
• data — whatever data your match function needs. you hand it over, it gets passed along. simple ✨
• vers — if this isn't NULL, it gets filled in with the version data of the TEE device that the returned context belongs to. free info, we love to see it 🎀

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🌈 DESCRIPTION 🌈

So what does it actually do? It's doing an operation similar to open("/dev/teeX") in user space — yeah, the same energy, just from inside the kernel, iykyk. 🔥

⚠️ important bestie: a returned context must be released with tee_client_close_context. no leaking, no leaving it on read. close your contexts, periodt. 💀

It returns a TEE context of the first TEE device matched by the match callback — or an ERR_PTR. that's it, that's the whole return story. if nothing matches, you're getting an ERR_PTR, so check it, don't just assume it slayed 🙈

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👑 SEE ALSO 👑

the whole friend group, in the original order, because we don't gatekeep:

Kernel file ./include/linux/tee_drv.h struct tee_context(9), struct tee_shm(9), tee_shm_alloc_kernel_buf(9), tee_shm_register_kernel_buf(9), tee_shm_register_fd(9), tee_shm_free(9), tee_shm_get_va(9), tee_shm_get_pa(9), tee_shm_get_size(9), tee_shm_get_pages(9), tee_shm_get_page_offset(9), tee_client_close_context(9), tee_client_get_version(9), tee_client_open_session(9), tee_client_close_session(9), tee_client_system_session(9), tee_client_invoke_func(9), tee_client_cancel_req(9), struct tee_client_device(9), struct tee_client_driver(9)

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anyway, that's the page! ✨ this one came out of ./include/linux, October 2026, and it's officially tee_client_open_context(9) — go forth and open those contexts responsibly, bestie 💜🧚