task_clear_jobctl_trapping(9)

💅 task_clear_jobctl_trapping(9) — from the Kernel API Manual ✨

okay so bestie, buckle up, because today we're gonna learn how to gently release a ptracer that's been sitting there waiting on us 🫶

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🌸 NAME 🌸

task_clear_jobctl_trapping — clears the jobctl trapping bit, no cap 💯

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✨ SYNOPSIS ✨

void task_clear_jobctl_trapping (struct task_struct *task );

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🎀 ARGUMENTS 🎀

• task — the target task, aka the main character of this whole operation 👑

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💖 DESCRIPTION 💖

okay so here's the vibe: if JOBCTL_TRAPPING is set, that means a ptracer is literally sitting there waiting for us to enter TRACED 🥺

So what do we do? We clear it, and we wake up the ptracer. That's it. That's the whole job. Iconic behavior, honestly ✨

And before you ask — nope, we don't need any further locking, so don't come for us about it 🙈 task->siglock guarantees that task->parent points to the ptracer, and that's all the reassurance we need. Slay 💅

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🦋 CONTEXT 🦋

must be called with task->sighand->siglock held 🔒 like, this is not optional, bestie, it's the whole rule of the game

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🌈 SEE ALSO 🌈

Kernel file ./kernel/signal.c plus this whole friend group of related calls, fr fr:

• task_set_jobctl_pending(9)
• task_clear_jobctl_pending(9)
• task_participate_group_stop(9)
• ptrace_trap_notify(9)
• force_sig_seccomp(9)
• do_notify_parent_cldstop(9)
• do_signal_stop(9)
• do_jobctl_trap(9)
• do_freezer_trap(9)
• signal_delivered(9)
• sys_restart_syscall(9)
• set_current_blocked(9)
• sys_rt_sigprocmask(9)
• sys_rt_sigpending(9)
• copy_siginfo_to_external32(9)
• do_sigtimedwait(9)
• sys_rt_sigtimedwait(9)
• sys_kill(9)
• sys_pidfd_send_signal(9)
• sys_tgkill(9)
• sys_tkill(9)
• sys_rt_sigqueueinfo(9)
• sys_sigpending(9)
• sys_sigprocmask(9)
• sys_rt_sigaction(9)
• sys_rt_sigsuspend(9)

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and that's the whole reading bestie, mwah 🫶 this lil drop lives in ./kernel, it's the October 2026 edition of task_clear_jobctl_trapping(9), and honestly? she ate. go forth and clear that bit 💜🎀