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Let reap() communicate the dead process's exit status to the caller.

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This way the scheduler doesn't need to plumb the exit status into the waiter.
We still plumb the waitee pid though, I don't love it but it can be fixed.
This commit is contained in:
Andreas Kling
2018-11-28 22:01:24 +01:00
parent 938d1b8bfb
commit d90104f9e0
4 changed files with 18 additions and 14 deletions
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18
Kernel/Process.cpp
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@@ -1411,13 +1411,15 @@ mode_t Process::sys$umask(mode_t mask)
return old_mask;
}
void Process::reap(Process& process)
int Process::reap(Process& process)
{
InterruptDisabler disabler;
int exit_status = (process.m_termination_status << 8) | process.m_termination_signal;
dbgprintf("reap: %s(%u) {%s}\n", process.name().characters(), process.pid(), toString(process.state()));
ASSERT(process.state() == Dead);
g_processes->remove(&process);
delete &process;
return exit_status;
}
pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
@@ -1429,6 +1431,9 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
if (!validate_write_typed(wstatus))
return -EFAULT;
int dummy_wstatus;
int& exit_status = wstatus ? *wstatus : dummy_wstatus;
{
InterruptDisabler disabler;
if (waitee != -1 && !Process::from_pid(waitee))
@@ -1439,10 +1444,10 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
if (waitee == -1) {
pid_t reaped_pid = 0;
InterruptDisabler disabler;
for_each_child([&reaped_pid] (Process& process) {
for_each_child([&reaped_pid, &exit_status] (Process& process) {
if (process.state() == Dead) {
reaped_pid = process.pid();
reap(process);
exit_status = reap(process);
}
return true;
});
@@ -1452,7 +1457,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
if (!waitee_process)
return -ECHILD;
if (waitee_process->state() == Dead) {
reap(*waitee_process);
exit_status = reap(*waitee_process);
return waitee;
}
return 0;
@@ -1460,7 +1465,6 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
}
m_waitee = waitee;
m_waitee_status = 0;
block(BlockedWait);
sched_yield();
if (m_was_interrupted_while_blocked)
@@ -1473,9 +1477,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
waitee_process = Process::from_pid(m_waitee);
}
ASSERT(waitee_process);
reap(*waitee_process);
if (wstatus)
*wstatus = m_waitee_status;
exit_status = reap(*waitee_process);
return m_waitee;
}