ladybird/Kernel/Syscalls/realpath.cpp
Andreas Kling cda2b9e71c Kernel: Improvements to Custody absolute path serialization
- Renamed try_create_absolute_path() => try_serialize_absolute_path()
- Use KResultOr and TRY() to propagate errors
- Don't call this when it's only for debug logging
2021-09-06 13:06:05 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringView.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<FlatPtr> Process::sys$realpath(Userspace<const Syscall::SC_realpath_params*> user_params)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(rpath);
auto params = TRY(copy_typed_from_user(user_params));
auto path = TRY(get_syscall_path_argument(params.path));
auto custody = TRY(VirtualFileSystem::the().resolve_path(path->view(), current_directory()));
auto absolute_path = TRY(custody->try_serialize_absolute_path());
size_t ideal_size = absolute_path->length() + 1;
auto size_to_copy = min(ideal_size, params.buffer.size);
TRY(copy_to_user(params.buffer.data, absolute_path->characters(), size_to_copy));
// Note: we return the whole size here, not the copied size.
return ideal_size;
};
}