STRUCT TEE_IOCTL_INVOKE_ARG(9)

💜 struct tee_ioctl_invoke_arg(9) — Kernel API Manual 💜

okay bestie, so this is a page from the Kernel API Manual, and it's literally the struct you use to invoke a function in a Trusted Application ✨ like, that's the whole NAME section, no notes, it ate.

🎀 SYNOPSIS 🎀

here's the shape of it, character for character, don't touch:

struct tee_ioctl_invoke_arg {
    __u32 func;
    __u32 session;
    __u32 cancel_id;
    __u32 ret;
    __u32 ret_origin;
    __u32 num_params;
    struct tee_ioctl_param params[];
 };

🫶 MEMBERS 🫶

okay so every field, one by one, i'm not skipping a single one, that's the rule 💅

• func — [in] a Trusted Application function, and it's specific to the TA — so like, it only means something to the TA you're talking to, don't come for me about it 🌸
• session — [in] the session id 🎫
• cancel_id — [in] the cancellation id, a unique value that identifies this request, so when you cancel you know exactly which one you mean fr fr
• ret — [out] the return value comes back here 💫
• ret_origin — [out] the origin of the return value, like where it came from, receipts basically 🧾
• num_params — [in] the number of parameters that follow this struct, count them correctly bestie i'm begging 😭
• params — the array of ioctl parameters, it's the flexible-array member at the end, no cap 🦋

reminder: [in] means you feed it in, [out] means it comes back to you. don't flip them, that's giving chaos 💀

🦋 SEE ALSO 🦋

the whole friend group, all of them, linked and iconic 👑

• Kernel file ./include/uapi/linux/tee.h
• struct tee_ioctl_version_data(9)
• TEE_IOC_VERSION(9)
• struct tee_ioctl_shm_alloc_data(9)
• TEE_IOC_SHM_ALLOC(9)
• struct tee_ioctl_buf_data(9)
• struct tee_ioctl_param(9)
• struct tee_ioctl_open_session_arg(9)
• TEE_IOC_OPEN_SESSION(9)
• TEE_IOC_INVOKE(9)
• struct tee_ioctl_cancel_arg(9)
• TEE_IOC_CANCEL(9)
• struct tee_ioctl_close_session_arg(9)
• TEE_IOC_CLOSE_SESSION(9)
• struct tee_iocl_supp_recv_arg(9)
• TEE_IOC_SUPPL_RECV(9)
• struct tee_iocl_supp_send_arg(9)
• TEE_IOC_SUPPL_SEND(9)
• struct tee_ioctl_shm_register_data(9)
• struct tee_ioctl_shm_register_fd_data(9)
• TEE_IOC_SHM_REGISTER_FD(9)
• TEE_IOC_SHM_REGISTER(9)
• struct tee_ioctl_object_invoke_arg(9)

✨ and that's the page, mwah ✨ this one lives over in ./include/uapi/linux, dated October 2026, and the whole thing is filed under struct tee_ioctl_invoke_arg(9) — go invoke something iconic bestie, ily, bye 🫶💖🌷