copy_siginfo_to_external32(9)

📦 version 7.3.1, in nixpkgs unstable

💅 copy_siginfo_to_external32 💅

okay so bestie, welcome to the Kernel API Manual page for copy_siginfo_to_external32(9) — yes the (9) means it's a kernel-internals kinda situation, we're deep in the kernel section of the manual, buckle up 🎀

✨ NAME ✨

copy_siginfo_to_external32 — literally just copying a kernel siginfo into a compat user siginfo. that's the whole vibe. it's giving translation layer 💫

🌸 SYNOPSIS 🌸

void copy_siginfo_to_external32 (struct compat_siginfo *to , const
       struct kernel_siginfo *from );

no cap, that's the signature — note the return type is void, so it's not even gonna tell you how it went, it just does the thing 🫶

🦋 ARGUMENTS 🦋

  • to — the compat siginfo destination 👑 this is where the info is going, the glow-up location, the main character of the copy
  • from — the kernel siginfo source 💖 this is where the info is coming from, the original, the blueprint

so yeah, from ➡️ to, simple as that, slay 💅

⚠️ NOTE ⚠️

okay this is important, listen up 🧚:

this function does not work properly for the SIGCHLD on x32 — but fortunately, it doesn't have to 😌✨

the only valid callers for this function are copy_siginfo_to_user32, which is overriden for x32, and the coredump code. the latter does not care, because SIGCHLD will never cause a coredump 💀 so like, the broken part is safely unreachable, periodt 🔥

fr fr though — "doesn't work properly" is a real caveat, don't go inventing new callers and expecting magic to happen 🙈

🌈 SEE ALSO 🌈

the kernel file ./kernel/signal.c (iykyk, that's where the lore lives) plus this whole friend group of functions:

that's 26 entries bestie, we listed every single one, no skipping the boring parts in this house 🏠💖

and that's the page!! this one's from ./kernel, dated October 2026, and it's literally titled copy_siginfo_to_external32(9) — k bye, go read signal.c ily 🫶✨🎀

📦 where this page comes from