STRUCT SYNC_MERGE_DATA(9)

💅 struct sync_merge_data(9) — Kernel API Manual energy 💅

okay so welcome to the Kernel API Manual page for struct sync_merge_data(9) — we're doing fence merging and it's lowkey iconic. 🦋

✨ NAME ✨

struct sync_merge_data — SYNC_IOC_MERGE: merge two fences. That's the whole assignment, bestie. 💖

📜 SYNOPSIS 📜

struct sync_merge_data {
    char name[32];
    __s32 fd2;
    __s32 fence;
    __u32 flags;
    __u32 pad;
};

🫶 Members 🫶

• name — name of new fence. Naming rights: secured. 🎀
• fd2 — file descriptor of second fence. The other half of the merge. 💅
• fence — returns the fd of the new fence to userspace. Yes, it hands the new fence fd back to userspace. 🫴
• flags — merge_data flags. FLAGS. We love a flag field. ✨
• pad — padding for 64-bit alignment, should always be zero. Keep it zero, okay? That's the rule. 🚨

🌸 Description 🌸

Creates a new fence containing copies of the sync_pts in both the calling fd and sync_merge_data.fd2. Returns the new fence's fd in sync_merge_data.fence. So it's literally making a new fence from both sides and giving you the fd back through the struct. No cap. 🔥

👀 SEE ALSO 👀

• Kernel file ./include/uapi/linux/sync_file.h
• struct sync_fence_info(9)
• struct sync_file_info(9)
• struct sync_set_deadline(9)

This struct sync_merge_data(9) page comes from ./include/uapi/linux and is dated October 2026 — mwah, bye bestie, go merge those fences responsibly! 💋🎀