STRUCT LINEEVENT_STATE(9)

💖 struct lineevent_state(9) 💖

okay bestie, so this is from the Kernel API Manual and it's literally the whole personality of a userspace event, like the state that holds the entire vibe of one. sit down, hydrate, let's go 🫶

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✨ NAME ✨

struct lineevent_state — contains the state of a userspace event 💅

like yes that's the whole name and it ate, no notes

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🌸 SYNOPSIS 🌸

struct lineevent_state {
    struct gpio_device *gdev;
    const char *label;
    struct gpio_desc *desc;
    u32 eflags;
    int irq;
    wait_queue_head_t wait;
    struct notifier_block device_unregistered_nb;
    struct gpioevent_data *events;
    u64 timestamp;
 };

that's the whole struct, every field, exactly as it lives in the kernel, not me editing anything, i would NEVER 😤

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🎀 Members 🎀

• gdev — the GPIO device this event is about, like the main character it's attached to 👑
• label — the consumer label, used to tag descriptors, so you know who this event belongs to 🏷️
• desc — the GPIO descriptor that this event is literally holding onto 💖
• eflags — the event flags this line was requested with, so it remembers its own settings fr fr
• irq — the interrupt that triggers in response to events on this GPIO ⚡
• wait — the wait queue that handles blocking reads of events, aka where your read goes to nap 😴
• device_unregistered_nb — the notifier block for receiving gdev unregister events, so we hear about the breakup 📵
• events — the KFIFO for the GPIO events, a little first-in-first-out cutie lineup 🧚
• timestamp — a cache for the timestamp, storing it between the hardirq and the IRQ thread, used to bring the timestamp close to the actual event — like it's right there when the thing happens, not fashionably late ⏰

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpio/gpiolib-cdev.c
• struct linehandle_state(9)
• struct line(9)
• struct linereq(9)
• gpio_chrdev_open(9)
• gpio_chrdev_release(9)

all the linked besties, go read them, iykyk 💜

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lowkey a reminder that this is kernel API territory — respect the struct, don't go inventing fields, the compiler will absolutely humble you 💀

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so yeah that's the page 🌈 and for the sign-off: this one comes from the source path ./drivers/gpio, dated October 2026, and it's filed under struct lineevent_state(9) — iconic, no cap 💅✨🍓