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Kernel + LibC: Handle running processes in do_waitid()

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AnotherTest 2020-05-16 03:02:14 +04:30 committed by Andreas Kling
parent 9d54f21859
commit 8582a06899
3 changed files with 28 additions and 34 deletions
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56
Kernel/Process.cpp
View file

@ -34,6 +34,7 @@
#include <AK/Types.h>
#include <Kernel/ACPI/Parser.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Console.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Devices/KeyboardDevice.h>
#include <Kernel/Devices/NullDevice.h>
@ -49,6 +50,7 @@
#include <Kernel/FileSystem/TmpFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/IO.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/KSyms.h>
#include <Kernel/Module.h>
@ -62,6 +64,7 @@
#include <Kernel/Random.h>
#include <Kernel/Scheduler.h>
#include <Kernel/SharedBuffer.h>
#include <Kernel/StdLib.h>
#include <Kernel/Syscall.h>
#include <Kernel/TTY/MasterPTY.h>
#include <Kernel/TTY/TTY.h>
@ -73,9 +76,6 @@
#include <Kernel/VM/ProcessPagingScope.h>
#include <Kernel/VM/PurgeableVMObject.h>
#include <Kernel/VM/SharedInodeVMObject.h>
#include <Kernel/IO.h>
#include <Kernel/Console.h>
#include <Kernel/StdLib.h>
#include <LibC/errno_numbers.h>
#include <LibC/limits.h>
#include <LibC/signal_numbers.h>
@ -2429,31 +2429,6 @@ KResultOr<siginfo_t> Process::do_waitid(idtype_t idtype, int id, int options)
return KResult(-ECHILD);
}
if (options & WNOHANG) {
// FIXME: Figure out what WNOHANG should do with stopped children.
if (idtype == P_ALL) {
InterruptDisabler disabler;
siginfo_t siginfo;
memset(&siginfo, 0, sizeof(siginfo));
for_each_child([&siginfo](Process& process) {
if (process.is_dead())
siginfo = reap(process);
return IterationDecision::Continue;
});
return siginfo;
} else if (idtype == P_PID) {
InterruptDisabler disabler;
auto* waitee_process = Process::from_pid(id);
if (!waitee_process)
return KResult(-ECHILD);
if (waitee_process->is_dead())
return reap(*waitee_process);
} else {
// FIXME: Implement other PID specs.
return KResult(-EINVAL);
}
}
pid_t waitee_pid;
// FIXME: WaitBlocker should support idtype/id specs directly.
@ -2466,9 +2441,8 @@ KResultOr<siginfo_t> Process::do_waitid(idtype_t idtype, int id, int options)
return KResult(-EINVAL);
}
if (!(options & WNOHANG))
if (Thread::current->block<Thread::WaitBlocker>(options, waitee_pid) != Thread::BlockResult::WokeNormally)
return KResult(-EINTR);
if (Thread::current->block<Thread::WaitBlocker>(options, waitee_pid) != Thread::BlockResult::WokeNormally)
return KResult(-EINTR);
InterruptDisabler disabler;
@ -2484,13 +2458,29 @@ KResultOr<siginfo_t> Process::do_waitid(idtype_t idtype, int id, int options)
auto* waitee_thread = Thread::from_tid(waitee_pid);
if (!waitee_thread)
return KResult(-ECHILD);
ASSERT(waitee_thread->state() == Thread::State::Stopped);
ASSERT((options & WNOHANG) || waitee_thread->state() == Thread::State::Stopped);
siginfo_t siginfo;
memset(&siginfo, 0, sizeof(siginfo));
siginfo.si_signo = SIGCHLD;
siginfo.si_pid = waitee_process->pid();
siginfo.si_uid = waitee_process->uid();
siginfo.si_code = CLD_STOPPED;
switch (waitee_thread->state()) {
case Thread::State::Stopped:
siginfo.si_code = CLD_STOPPED;
break;
case Thread::State::Running:
case Thread::State::Runnable:
case Thread::State::Blocked:
case Thread::State::Dying:
case Thread::State::Queued:
siginfo.si_code = CLD_CONTINUED;
break;
default:
ASSERT_NOT_REACHED();
break;
}
siginfo.si_status = waitee_thread->m_stop_signal;
return siginfo;
}

3
Kernel/Scheduler.cpp
View file

@ -274,7 +274,8 @@ bool Thread::WaitBlocker::should_unblock(Thread& thread, time_t, long)
}
bool wait_finished = ((m_wait_options & WEXITED) && child_exited)
|| ((m_wait_options & WSTOPPED) && child_stopped);
|| ((m_wait_options & WSTOPPED) && child_stopped)
|| (m_wait_options & WNOHANG);
if (!wait_finished)
return IterationDecision::Continue;

3
Libraries/LibC/sys/wait.cpp
View file

@ -72,6 +72,9 @@ pid_t waitpid(pid_t waitee, int* wstatus, int options)
case CLD_STOPPED:
*wstatus = siginfo.si_status << 8 | 0x7f;
break;
case CLD_CONTINUED:
*wstatus = 0;
return 0; // return 0 if running
default:
ASSERT_NOT_REACHED();
}