Function sys_fork

src/syscall.cpp:147–174

}

[[nodiscard]] auto sys_fork() -> int {
  auto& task_manager = TaskManagerSingleton::instance();
  auto current = task_manager.GetCurrentTask();

  if (!current || !current->trap_context_ptr) {
    klog::Err("[Syscall] sys_fork: Invalid current task or trap context");
    return -1;
  }

  // fork = clone with flags=0 (完全复制，不共享任何资源)
  auto result = task_manager.Clone(0, nullptr, nullptr, nullptr, nullptr,
                                   *current->trap_context_ptr);

  if (!result.has_value()) {
    // 失败返回 -1
    klog::Err("[Syscall] sys_fork failed: {}", result.error().message());
    return -1;
  }

  Pid child_pid = result.value();
  if (child_pid == 0) {
    // 子进程返回 0
    return 0;
  } else {
    // 父进程返回子进程 PID
    return static_cast<int>(child_pid);
  }
}

[[nodiscard]] auto sys_gettid() -> int {
  auto current = TaskManagerSingleton::instance().GetCurrentTask();