PROBE::SIGNAL.DO_A(3stap)

💖 PROBE::SIGNAL.DO_A 💖

okay bestie, welcome to probe::signal.do_action from the Signal Tapset — this is page 3stap of the SystemTap tapset reference, and she is lowkey iconic ✨

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🎀 NAME 🎀

probe::signal.do_action — the probe that's literally there while a signal action is getting examined or changed 👀

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🦋 SYNOPSIS 🦋

probe signal.do_action {}

that's it. that's the whole vibe. no args, no drama, she just shows up 💅

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🌸 VALUES 🌸

bestie these are the local variables you get handed when this probe fires, and every single one of them matters:

• sig — the signal that's being examined or changed 🫶
• oldsigact_addr — the address of the old sigaction struct that's associated with the signal (the before pic 😭)
• sa_mask — the new mask of the signal
• sa_handler — the new handler of the signal
• sig_name — a string representation of the signal, so you don't gotta decode numbers in your head, slay
• name — the name of the probe point itself
• sigact_addr — the address of the new sigaction struct that's associated with the signal (the after pic ✨)

ngl the way oldsigact_addr and sigact_addr are both right there is giving glow-up montage — you literally get to see before AND after 🦋

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👑 SEE ALSO 👑

• tapset::signal(3stap)

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SystemTap Tapset Reference, Ver — September 2026 🍓

and that's the whole page, bestie. go probe some signals, you got this fr fr 💜🧚✨