STRUCT NS_ID_REQ(9)

💅 struct ns_id_req(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the struct ns_id_req(9) page of the Kernel API Manual, and it's literally just a lil struct with big main character energy. let's get into it ✨

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🌸 NAME 🌸

struct ns_id_req — the namespace ID request structure. that's it, that's the vibe. no cap. 💖

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✨ SYNOPSIS ✨

copy it exactly, do not touch, the compiler is watching 👀

struct ns_id_req {
    __u32 size;
    __u32 spare;
    __u64 ns_id;
    struct {
      __u32 ns_type;
      __u32 spare2;
      __u64 user_ns_id;
    };
 };

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🫶 Members 🫶

the whole squad, one by one 💅

• size — size of this structure. yes queen, know ur own size 👑
• spare — reserved for future use. it's literally just sitting there holding a seat for future-us, we love a planner 🎀
• ns_id — last namespace id. the most recent one, the it-girl of IDs 🔥
• {unnamed_struct} — anonymous. no name, all mystery, very mysterious-girl-of-the-group energy 🦋 (the page doesn't spell out ns_type and spare2 individually, they're just vibing inside there, iykyk)
• user_ns_id — owning user namespace ID. the one who owns the place, the landlord, the main character 🏠💜

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💀 Description 💀

so this whole structure is for passing a namespace ID plus some miscellaneous parameters to statns(2) and listns(2). literally a little care package of namespace info, hand-delivered 🤲✨

for statns(2), param represents the request mask. for listns(2), param represents the last listed mount id (or zero). yes, zero counts, zero is valid, don't come for zero 🙈

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🌈 SEE ALSO 🌈

• Kernel file ./tools/include/uapi/linux/nsfs.h — go read it, it's giving source of truth 📖💖

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reminder bestie: this page is short and sweet but every field matters — copy the struct character for character or the vibe check WILL fail 😭

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and that's the whole page, you ate that 🍓💅 — this one's from ./tools/include/uapi/linux, dated October 2026, so it's recent, it's fresh, it's iconic. periodt. ⭐🧚