PROBE::SIGNAL.HAND(3stap)

💖 PROBE::SIGNAL.HAND 💖

okay bestie, so this is a page from the SystemTap Tapset Reference — it's manual section 3stap, and it's literally all about the moment a signal handler gets called. the way that a probe point can just show up right when the kernel is about to hand off to a signal handler? iconic. 👑

---

✨ NAME ✨

probe::signal.handle — Signal handler being invoked

like… that's it. that's the whole vibe. we're catching the handler in the act. 🎀

---

✨ SYNOPSIS ✨

probe signal.handle {}

no arguments, no fuss, just vibes. she takes nothing and gives you everything. 💅

---

✨ VALUES ✨

these are all the lil' goodies you can peek at inside this probe. every single one, no skips, we don't do that here. 🫶

• regs — the address of the kernel-mode stack area. ⚠️ heads up bestie, this one is deprecated in SystemTap 2.1 — she's giving retired queen, still here but no longer the moment. 💀
• sig — the signal number that invoked the signal handler. this is the "who called" of the whole situation. 📞
• sig_code — the si_code value of the siginfo signal. lil' detail, big lore. 🔍
• sig_mode — tells you whether the signal was a user-mode or kernel-mode signal. vibe check: which realm are we in? 🌈
• sig_name — a string representation of the signal. so like, the name of it but readable. we love a string. ✨
• name — the name of the probe point. yes queen, identify yourself. 👑
• oldset_addr — the address of the bitmask array of blocked signals. ⚠️ also deprecated in SystemTap 2.1. same energy as regs, fr fr. 💀
• sinfo — the address of the siginfo table. the receipts table, basically. 🧾
• ka_addr — the address of the k_sigaction table associated with the signal. the full-on admin of this whole operation. 🗂️

no cap: regs and oldset_addr are both marked deprecated in SystemTap 2.1, so if you're out here building something new on them, that's on you bestie. 😭

---

✨ SEE ALSO ✨

• tapset::signal(3stap) — go read this one too, it's the sister page and she also ate. 🔥

---

🌸 okay that's the whole page!! mwah 💖

this was the SystemTap Tapset Reference, version Ver, from September 2026 — and this specific page is PROBE::SIGNAL.HAND(3stap). thanks for coming to my ted talk, now go probe some signals. 🦋✨