get_dir_entries.cpp 854 B

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  1. /*
  2. * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
  3. *
  4. * SPDX-License-Identifier: BSD-2-Clause
  5. */
  6. #include <Kernel/FileSystem/FileDescription.h>
  7. #include <Kernel/Process.h>
  8. namespace Kernel {
  9. KResultOr<FlatPtr> Process::sys$get_dir_entries(int fd, Userspace<void*> user_buffer, size_t user_size)
  10. {
  11. REQUIRE_PROMISE(stdio);
  12. if (user_size > NumericLimits<ssize_t>::max())
  13. return EINVAL;
  14. auto description = fds().file_description(fd);
  15. if (!description)
  16. return EBADF;
  17. auto buffer = UserOrKernelBuffer::for_user_buffer(user_buffer, static_cast<size_t>(user_size));
  18. if (!buffer.has_value())
  19. return EFAULT;
  20. auto result = description->get_dir_entries(buffer.value(), user_size);
  21. if (result.is_error())
  22. return result.error();
  23. else
  24. return result.release_value();
  25. }
  26. }