usb_urb_dir_out(9)

✨ usb_urb_dir_out(9) — the vibe check for URBs ✨

okay so bestie, picture this: you're deep in Kernel API Manual territory, surrounded by USB structs, and you just need to know one thing — is this URB going out or not? That's literally it. That's the whole function. And it slays at it. 💅

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🌸 NAME 🌸

usb_urb_dir_out — check if an URB describes an OUT transfer

🎀 SYNOPSIS 🎀

int usb_urb_dir_out (struct urb *urb );

🦋 ARGUMENTS 🦋

• urb — the URB to be checked. yes bestie, this URB. the one you're holding. give it a look 👀

⭐ RETURN ⭐

1 if urb describes an OUT transfer (host-to-device), otherwise 0.

like, that's it. one or zero. no cap, no in-between, no ✨mystery✨ third value. it's giving binary icon behavior. 🔥

heads up: the 0 is "otherwise" — so literally anything that isn't an OUT transfer (host-to-device) lands there. don't go reading extra meaning into it, fr fr. 🙈

👑 SEE ALSO 👑

ok so this is the part where the manpage just. keeps going. and going. and honestly? we love a thorough queen. 🫶 everything below lives in the Kernel file ./include/linux/usb.h:

• 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_in(9)
• struct usb_sg_request(9)

and yeah — usb_urb_dir_in(9) is right there at the end, the sibling, the counterpart, the other direction. iykyk. 💖

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that's the whole page bestie, you ate it up, no crumbs 🌈

this little love letter to USB lives under ./include/linux, dated October 2026, in the Kernel API Manual — mwah, go check your URBs, ily, bye! 💜🍓🧚