Luna/kernel/src/sys/exit.cpp

#include "sys/Syscall.h"
#include "thread/Scheduler.h"

Result<u64> sys_exit(Registers*, SyscallArgs args)
{
    u8 status = (u8)args[0];

    Thread* current = Scheduler::current();

    Scheduler::for_each_child(current, [](Thread* child) {
        child->parent = Scheduler::init_thread();
        return true;
    });

    auto* parent = current->parent;
    if (parent && parent->state == ThreadState::Waiting)
    {
        auto child = *parent->child_being_waited_for;
        if (child == -1 || child == (pid_t)current->id)
        {
            parent->child_being_waited_for = (pid_t)current->id;
            parent->state = ThreadState::Runnable;
        }
    }

    current->status = status;
    current->state = ThreadState::Exited;

    kernel_yield();
    unreachable();
}