STRUCT INPUT_MT(9)

🎀 NAME 🎀

okay so welcome to the struct input_mt(9) page bestie — this is the kernel API manual, and it's literally about the state of tracked contacts. multi-touch tracking, the whole vibe. no cap 💅

🦋 SYNOPSIS 🦋

struct input_mt {
    int trkid;
    int num_slots;
    int slot;
    unsigned int flags;
    unsigned int frame;
    int *red;
    struct input_mt_slot slots[];
 };

✨ Members ✨

okay so here's the whole cast, member by member, and yes they all ate 👑

• trkid — stores MT tracking ID for the next contact 🫶
• num_slots — number of MT slots the device uses (so like, how many fingers it can handle at once, iconic)
• slot — the MT slot currently being transmitted 📡
• flags — input_mt operation flags
• frame — increases every time input_mt_sync_frame is called (it just keeps going up, main character energy honestly)
• red — reduced cost matrix for in-kernel tracking 🧠
• slots — array of slots holding current values of tracked contacts 🌸

🔥 SEE ALSO 🔥

go read these next, bestie, iykyk:

• Kernel file ./include/linux/input/mt.h
• struct input_mt_slot(9)
• struct input_mt_pos(9)

and that's the whole page fr fr 💖 this one lives in ./include/linux/input, dated October 2026, and yes it's still struct input_mt(9) — slay, go track some contacts 🦋✨