STRUCT V4L2_SUBSCRIBED_EVENT_OPS(9)

💅 struct v4l2_subscribed_event_ops(9) 💅

okay so this is the Kernel API Manual page for struct v4l2_subscribed_event_ops, and honestly bestie, it's a little cutie. no cap.

---

🌸 NAME 🌸

struct v4l2_subscribed_event_ops — the operations struct for subscribed events. literally what it says on the tin 🎀

---

✨ SYNOPSIS ✨

here's the whole struct, bestie, every line of it, exactly as it lives:

struct v4l2_subscribed_event_ops {
    int (*add)(struct v4l2_subscribed_event *sev, unsigned int elems);
    void (*del)(struct v4l2_subscribed_event *sev);
    void (*replace)(struct v4l2_event *old, const struct v4l2_event
*new);
    void (*merge)(const struct v4l2_event *old, struct v4l2_event *new);
 };

look at her. four function pointers. main character energy 🔥 (and yes, the replace line wraps weird in the synopsis — that's just how she is, we don't judge 💅)

---

🦋 Members 🦋

breaking down the members one by one, because you deserve to know every single one:

• add — an optional callback, and it gets called when a brand new listener is added. 🫶
• del — also optional, and it fires when a listener stops listening. bye bestie 😭
• replace — optional callback that can replace event old with event new.
• merge — optional callback that can merge event old into event new.

note the vibe: they're all optional. nobody's forcing you to implement any of these, it's giving "do it if it sparks joy" 💖

---

🔍 SEE ALSO 🔍

go look at the kernel file ./include/media/v4l2-event.h, and then go be nosy about all of these:

• struct v4l2_kevent(9)
• struct v4l2_subscribed_event(9)
• v4l2_event_dequeue(9)
• v4l2_event_queue(9)
• v4l2_event_queue_fh(9)
• v4l2_event_wake_all(9)
• v4l2_event_pending(9)
• v4l2_event_subscribe(9)
• v4l2_event_unsubscribe(9)
• v4l2_event_unsubscribe_all(9)
• v4l2_event_subdev_unsubscribe(9)
• v4l2_src_change_event_subscribe(9)
• v4l2_src_change_event_subdev_subscribe(9)

like, read them all. iykyk 🧚‍♀️

---

⭐ the cute sign-off ⭐

okay that's the whole page, you ate it up. source lives at ./include/media, dated October 2026, and it's filed under struct v4l2_...ed_event_ops(9) in case you need to find her again. mwah 💜💜💜