KCOPY(9)

💫 KCOPY(9) 💫

okay bestie, welcome to the Kernel Developer's Manual entry for kcopy — it's giving "copy bytes but make it fault-safe" and honestly? iconic. 🫶

✨ NAME ✨

• kcopy — copy data with abort on page fault 💅

🌸 SYNOPSIS 🌸

#include <sys/systm.h>

int
kcopy(const void *src, void *dst, size_t len);

🦋 DESCRIPTION 🦋

So kcopy() copies len bytes from src to dst, and it aborts if a fatal page fault is encountered. no cap, that's the whole vibe check. 💀

And listen — kcopy() must save and restore the old fault handler. Why? Because it gets called by uiomove(9), which may be in the path of servicing a non-fatal page fault. like, do not skip that part, bestie, it's literally in the description. 🎀

⭐ RETURN VALUES ⭐

• 0 — success, slay ✨
• an error number — failure, and that's the documented outcome 😭

🌈 SEE ALSO 🌈

• errno(2)
• memcpy(9)
• uiomove(9)

and that's the page, bestie! source/version cutie: Debian, dated April 6, 2017 — KCOPY(9) said periodt. 💖🎀🦋