usb_endpoint_is_bulk_out(9)

✨ usb_endpoint_is_bulk_out — Kernel API Manual ✨

okay so bestie, welcome to usb_endpoint_is_bulk_out(9) 💖 this one's a little baby function that lives in the Kernel API Manual, and honestly? it's giving "one job and it does it flawlessly." no cap.

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🌸 NAME 🌸

usb_endpoint_is_bulk_out — check if the endpoint is bulk OUT 🫶

like... that's it. that's the whole gig. she checks, she answers, she leaves. main character energy fr.

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🎀 SYNOPSIS 🎀

int usb_endpoint_is_bulk_out (const struct usb_endpoint_descriptor *epd
);

look at her 💅 tiny little signature, const-correct, takes a pointer, returns an int. we love a low-maintenance icon.

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🦋 ARGUMENTS 🦋

• epd — the endpoint to be checked 🔍 that's the const struct usb_endpoint_descriptor * from up top, and yes she's const because we're not touching her, we're just looking. respect the boundaries bestie.

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⭐ DESCRIPTION ⭐

so here's the tea ☕: this function returns true if the endpoint has bulk transfer type AND OUT direction. both. at the same time. it's an AND situation, not an OR situation, iykyk.

and if it doesn't have both of those? it returns false. simple as that. no drama, no side quests, no hidden behaviour. she ate and left no crumbs 💀

ngl this is the kind of function you call when you've already got an epd in hand and you just need a vibe check on it — "are you bulk? are you out?" — and she answers in one boolean. periodt.

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🌈 SEE ALSO 🌈

okay this list is LONG and honestly kind of iconic, so let's give it the respect it deserves 👑

• Kernel file ./include/uapi/linux/usb/ch9.h — the header where the descriptor lore lives 📜
• struct usb_ctrlrequest(9)
• usb_endpoint_num(9)
• usb_endpoint_type(9)
• usb_endpoint_dir_in(9)
• usb_endpoint_dir_out(9)
• usb_endpoint_xfer_bulk(9)
• usb_endpoint_xfer_control(9)
• usb_endpoint_xfer_int(9)
• usb_endpoint_xfer_isoc(9)
• usb_endpoint_is_bulk_in(9)
• usb_endpoint_is_int_in(9)
• usb_endpoint_is_int_out(9)
• usb_endpoint_is_isoc_in(9)
• usb_endpoint_is_isoc_out(9)
• usb_endpoint_maxp(9)
• usb_endpoint_maxp_mult(9)

literally the whole endpoint friend group 🫶 go read them all, they're all slaying in their own way.

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🧚 sign-off 🧚

this little page comes from ./include/uapi/linux/usb, dated October 2026, and it's part of the Kernel API Manual — the usb_endpoint_is_bulk_out(9) era 💜

okay bye bestie, go check some endpoints, stay hydrated, and remember: bulk OUT or it didn't happen 💅✨🎀