STRUCT TEE_IOCL_SUPP_RECV_ARG(9)

✨ struct tee_iocl_supp_recv_arg(9) ✨

okay so bestie, we're in the Kernel API Manual, section 9, and today's main character is struct tee_iocl_supp_recv_arg — literally the thing that catches an incoming request for a supplicant function 🫶 ngl it's a glow-up of a struct, let's get into it.

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🌸 NAME 🌸

struct tee_iocl_supp_recv_arg — Receive a request for a supplicant function 💌

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🦋 SYNOPSIS 🦋

struct tee_iocl_supp_recv_arg {
    __u32 func;
    __u32 num_params;
    struct tee_ioctl_param params[];
 };

that's the whole fit, no cap ✨

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💅 Members 💅

• func — [in] supplicant function. this is the input girlie telling you which function we're talking about 💖
• num_params — [in/out] number of struct tee_ioctl_param entries in params. she works both directions, we love a versatile icon 👑
• params — array of ioctl parameters. the whole squad of them 🌈

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🎀 Description 🎀

okay this is the part you actually need to remember, so listen up 🔥

num_params is the number of params that tee-supplicant has room to receive when input, and num_params is the number of actual params tee-supplicant receives when output.

so like — same field, two completely different vibes depending on which way the data's flowing. input: how much room she has 🫶 output: how much actually showed up 😭 don't mix them up, i'm begging.

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⭐ SEE ALSO ⭐

Kernel file ./include/uapi/linux/tee.h — and the whole extended friend group:

• 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)
• struct tee_ioctl_invoke_arg(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)
• 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)

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💀 reminder that num_params changes meaning between input and output — that's not a bug, that's just her being an icon. read the Description again if you're confused, i got you 🧚

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okay bye bestie, that's the page!! this one lives in ./include/uapi/linux, dated October 2026, and it's filed under struct tee_...upp_recv_arg(9) — slay, go read the source, periodt 💜🎀