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Kernel: Change wait blocking to Process-only blocking

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This prevents zombies created by multi-threaded applications and brings
our model back to closer to what other OSs do.

This also means that SIGSTOP needs to halt all threads, and SIGCONT needs
to resume those threads.
This commit is contained in:
Tom 2020-12-08 21:18:45 -07:00 • committed by Andreas Kling
parent 47ede74326
commit c455fc2030
11 changed files with 284 additions and 203 deletions
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15
Kernel/Syscalls/ptrace.cpp
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@ -48,18 +48,11 @@ int Process::sys$ptrace(Userspace<const Syscall::SC_ptrace_params*> user_params)
/**
* "Does this process have a thread that is currently being traced by the provided process?"
*/
bool Process::has_tracee_thread(ProcessID tracer_pid) const
bool Process::has_tracee_thread(ProcessID tracer_pid)
{
bool has_tracee = false;
for_each_thread([&](Thread& t) {
if (t.tracer() && t.tracer()->tracer_pid() == tracer_pid) {
has_tracee = true;
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
return has_tracee;
if (auto tracer = this->tracer())
return tracer->tracer_pid() == tracer_pid;
return false;
}
KResultOr<u32> Process::peek_user_data(Userspace<const u32*> address)