usb_urb_dir_in(9)

✨ usb_urb_dir_in(9) ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — this one's a tiny little legend and it's lowkey iconic for how much mileage it gets out of a single int. Let's get into it 💅

🌸 NAME 🌸

usb_urb_dir_in — the vibe check that tells you whether an URB is describing an IN transfer 💖

🦋 SYNOPSIS 🦋

int usb_urb_dir_in (struct urb *urb );

💜 ARGUMENTS 💜

• urb — the URB we're checking, bestie. that's the one, that's the whole input 🙈

🔥 RETURN 🔥

1 if urb describes an IN transfer (device-to-host), otherwise 0. that's it. that's the whole answer — no cap, no edge cases, just a clean little 1 or 0 ✨

👑 SEE ALSO 👑

so this function rolls deep — it lives in the kernel file ./include/linux/usb.h and here's the whole friend group, every single one of them, no skips 🫶

• struct usb_host_endpoint(9)
• struct usb_interface(9)
• usb_set_intfdata(9)
• struct usb_interface_cache(9)
• struct usb_host_config(9)
• struct usb_device(9)
• usb_hub_for_each_child(9)
• usb_interface_claimed(9)
• usb_make_path(9)
• USB_DEVICE(9)
• USB_DEVICE_VER(9)
• USB_DEVICE_INTERFACE_CLASS(9)
• USB_DEVICE_INTERFACE_PROTOCOL(9)
• USB_DEVICE_INTERFACE_NUMBER(9)
• USB_DEVICE_INFO(9)
• USB_INTERFACE_INFO(9)
• USB_DEVICE_AND_INTERFACE_INFO(9)
• USB_VENDOR_AND_INTERFACE_INFO(9)
• struct usb_driver(9)
• struct usb_device_driver(9)
• struct usb_class_driver(9)
• module_usb_driver(9)
• struct urb(9)
• usb_fill_control_urb(9)
• usb_fill_bulk_urb(9)
• usb_fill_int_urb(9)
• usb_urb_dir_out(9)
• struct usb_sg_request(9)

and that's the whole page, bestie 💀 short, sweet, and serving exactly one boolean ✨

file this one under ./include/linux — it's the October 2026 girlies' edition of usb_urb_dir_in(9) and honestly? she ate 🌈🍓 mwah, go check your URBs 💖🧚⭐