STRUCT USB_OS_DESC(9)

👑 struct usb_os_desc(9) — the Kernel API Manual glow-up ✨

okay so bestie, welcome to the Kernel API Manual page for struct usb_os_desc. this lil cutie is the struct that describes OS descriptors associated with one interface — one interface, one struct, that's the whole vibe 🎀

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🌸 NAME 🌸

struct usb_os_desc — literally describes OS descriptors associated with one interface. that's it, that's the girl 💅

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✨ SYNOPSIS ✨

here's the whole fit, no cap, copy it exactly:

struct usb_os_desc {
    char *ext_compat_id;
    struct list_head        ext_prop;
    int ext_prop_len;
    int ext_prop_count;
    struct mutex            *opts_mutex;
    struct config_group     group;
    struct module           *owner;
 };

look at her. iconic. every field is doing its own thing and honestly? main character energy all around 🦋

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💖 Members 💖

let's meet the cast, one by one, because they all ate:

• ext_compat_id — 16 bytes of "Compatible ID" and "Subcompatible ID". yes, exactly 16 bytes, she's very specific about her measurements 🎀
• ext_prop — the Extended Properties list. a whole struct list_head, keeping her extended-property besties linked together 🫶
• ext_prop_len — Total length of Extended Properties blobs. all the blobs, counted up 💅
• ext_prop_count — Number of Extended Properties. the headcount, no cap 🔢
• opts_mutex — an Optional mutex protecting config data of a usb_function_instance. note the "optional" bestie — she's not always on duty 🙈
• group — a struct config_group that Represents OS descriptors associated with an interface in configfs. this is where the configfs girlies hang out ✨
• owner — the Module associated with this OS descriptor. she's got a sponsor, periodt 👑

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🔥 SEE ALSO 🔥

go read these next, i'm obsessed, iykyk:

• Kernel file ./include/linux/usb/composite.h
• struct usb_os_desc_ext_prop(9)
• struct usb_os_desc_table(9)
• struct usb_function(9)
• struct usb_configuration(9)
• struct usb_composite_driver(9)
• module_usb_composite_driver(9)
• struct usb_composite_dev(9)

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💀 real talk: those (9) numbers mean they're all manpage sections, so man 9 struct usb_function if you're curious. stealing that tip from... the page itself, basically. okay byeee 🌈

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and that's the whole page, bestie 💜 this came from the Kernel API Manual, source ./include/linux/usb, dated October 2026, and the struct is struct usb_os_desc(9) — go forth and slay your descriptors 🧚‍♀️🌸