PROBE::SIGNAL.CHEC(3stap)

💖 probe::signal.checkperm 💖

okay bestie, so this is a page straight out of the Signal Tapset — that's the manual it lives in, 3stap section and all — and it's literally just about one lil probe point. no big deal. except it IS a big deal because it's giving signal-vibe-check energy ✨

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🌸 NAME 🌸

probe::signal.checkperm — the probe that fires when a permission check is being performed on a signal that somebody's trying to send 👀

like, before the signal actually gets delivered, the kernel is like "hold up, are you allowed to send this?" and this probe is right there for it. main character behavior honestly.

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🎀 SYNOPSIS 🎀

probe signal.checkperm {}

that's it. that's the whole thing. no args, no fuss, just a probe point sitting there looking cute 🫶

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✨ VALUES ✨

okay so when this probe fires, here's all the stuff you get to peek at. every single one, no skipping, i know you'd never 💅

• sig — the number of the signal. just the raw digit, like 9 or 15. the actual number, no makeup on.
• sig_name — the string version of that same signal, so like the cute human-readable name instead of the number. same signal, different fit ✨
• name — the name of the probe point. yep, it's the probe's own name. it knows who it is, love that for it 💖
• si_code — tells you the signal type. this is the code that explains why / what kind of signal situation we're in.
• pid_name — the name of the process that's receiving the signal. the recipient, the one getting the notification 🎀
• task — a task handle pointing at the signal recipient. like a little reference to the task that's about to get this signal.
• sinfo — the address of the siginfo structure. that's where all the juicy signal details live, and this hands you the address of it 📍
• sig_pid — the PID of the process receiving the signal. same recipient as pid_name, but as a number this time 🔢

quick note bestie: pid_name and sig_pid are both about the receiving process, and task is a handle to that same recipient. the sender isn't the star of this show, the receiver is 💅

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🌈 SEE ALSO 🌈

• tapset::signal(3stap) — go read the whole signal tapset page if you wanna see the full squad 🦋

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that's the page, bestie. go forth and check those perms 💜

kisses, this was the SystemTap Tapset Reference, September 2026 edition 🎀✨