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Kernel: Detach the traced process on process exit

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Currently, when a process which has a tracee exits, nothing will happen,
leaving the tracee unable to be attached again. This will call the
stop_tracing function on any process which is traced by the exiting
process and sending the SIGSTOP signal making the traced process wait
for a SIGCONT (just as Linux does)
This commit is contained in:
cbsirb 2021-02-25 17:19:31 +02:00 committed by Andreas Kling
parent 780e84f2e1
commit 8456dc87d8
Notes: sideshowbarker 2024-07-19 17:29:22 +09:00 
Author: https://github.com/cbsirb 🔰
Commit: https://github.com/SerenityOS/serenity/commit/8456dc87d8e
Pull-request: https://github.com/SerenityOS/serenity/pull/5521
Reviewed-by: https://github.com/itamar8910 ✅
1 changed files with 16 additions and 0 deletions
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16
Kernel/Process.cpp
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@ -543,6 +543,22 @@ void Process::die()
return IterationDecision::Continue;
});
{
ScopedSpinLock lock(g_processes_lock);
for (auto* process = g_processes->head(); process;) {
auto* next_process = process->next();
if (process->has_tracee_thread(m_pid)) {
dbgln_if(PROCESS_DEBUG, "Process {} ({}) is attached by {} ({}) which will exit", process->name(), process->pid(), name(), pid());
process->stop_tracing();
auto err = process->send_signal(SIGSTOP, this);
if (err.is_error())
dbgln("Failed to send the SIGSTOP signal to {} ({})", process->name(), process->pid());
}
process = next_process;
}
}
kill_all_threads();
}