itcw_add_tidaw(9)

💅 itcw_add_tidaw 💅

okay so bestie, welcome to the itcw_add_tidaw(9) page — it's from the Kernel API Manual, and it's literally the little function that tucks a brand-new tidaw into your itcw. no cap, it's a whole vibe. let's get into it 🫶

---

✨ NAME ✨

itcw_add_tidaw — add a tidaw to the itcw 🎀

---

🌸 SYNOPSIS 🌸

struct tidaw * itcw_add_tidaw (struct itcw *itcw , u8 flags , void *addr
, u32 count );

---

💖 ARGUMENTS 💖

• itcw — the address of the itcw, like, the actual thing you're adding to. main character energy 🎀
• flags — the flags for the new tidaw, so it knows what kind of girlypop it's gonna be ✨
• addr — the address value for the new tidaw 📍
• count — the count value for the new tidaw 🔢

---

🦋 DESCRIPTION 🦋

so what it does is add a new tidaw to the input/output data tidaw-list of the itcw you passed in — and which list it lands in depends on the value of the r-flag and the w-flag. iykyk 💅

on success it returns a pointer to the new tidaw 🎉 but if the new tidaw would exceed the available space? nope, not today — you get -ENOSPC back instead 😭

---

⭐ NOTE ⭐

listen up bestie, this one's important 👑

TTIC tidaws are automatically added when needed, so explicitly calling this interface with the TTIC flag is not supported — don't do it, fr fr 🙈

also: the last-tidaw flag for the last tidaw in the list gets set by itcw_finalize. so that's not your job, it's hers 💅

---

👑 SEE ALSO 👑

• Kernel file ./drivers/s390/cio/itcw.c
• itcw_get_tcw(9)
• itcw_calc_size(9)
• itcw_init(9)
• itcw_add_dcw(9)
• itcw_set_data(9)
• itcw_finalize(9)

go read those too, they're all iconic in their own way 🌈

---

that's the whole page, bestie! this little gem lives under ./drivers/s390/cio and it's stamped October 2026 — so yeah, future girlie vibes 💜 stay hydrated, read your manpages, periodt 💅✨🦋