ib_respond_empty_udata(9)

💅 ib_respond_empty_udata(9) 💅

okay bestie, so this is a page straight out of the Kernel API Manual (section 9, kernel vibes only, no cap) — and it's the lil function that zero-fills the response buffer back to userspace. it's giving "polite but empty," and honestly? iconic. 🫶

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✨ NAME ✨

ib_respond_empty_udata — zero fill the response buffer to userspace 🌸

like, it literally fills the buffer with zeros. that's the whole personality. and it ate. 💅

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🎀 SYNOPSIS 🎀

int ib_respond_empty_udata (struct ib_udata *udata );

that's the whole signature, bestie — takes one pointer to a struct ib_udata and hands you back an int. short king. 👑

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🦋 ARGUMENTS 🦋

• udata — ngl, the original docs say -- undescribed -- and honestly? they left it blank 😭 so that's what you get. the parameter exists, it's there, it's just... unbothered. 💀 (we still list it, because we respect it)

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💖 DESCRIPTION 💖

okay so here's the vibe check: you use this one when there is no driver response data to return. like, nothing to say, nothing to send — but you still gotta answer userspace. so this function steps in and zeroes any buffer the user may have provided. 🧚

and the reason is forward compatability (their spelling, not mine, I'm just the messenger 💜) — by zeroing out whatever buffer the user handed over, you keep things chill for future versions. no surprises, no garbage data, just clean lil zeros. slay. ✨

bestie note: "no driver response data" means no response data — so don't be out here expecting it to return actual content. it's empty on purpose. that's the point. 🎯

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🌈 SEE ALSO 🌈

peep these if you wanna go down the rabbit hole, iykyk 🐇✨

• the kernel file ./include/rdma/uverbs_ioctl.h (yes, the whole file, it said what it said)
• uverbs_attr_get_uobjs_arr(9)
• ib_copy_validate_udata_in(9)
• ib_copy_validate_udata_in_cm(9)
• ib_is_udata_in_empty(9) — vibe check: is it empty? 💀
• ib_respond_udata(9) — the one that actually says something
• ib_no_udata_io(9)

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and that's the whole page, bestie — no more, no less. hope it made sense! 🍓

sign-off time 🎀✨ this lil legend lives in ./include/rdma, and the timestamp on it says October 2026 — so mark your calendar, girlies. until then, stay zeroed and stay iconic. 💜🔥👑