mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/StringView.h>
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/FileSystem/VirtualFileSystem.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
KResultOr<FlatPtr> Process::sys$readlink(Userspace<const Syscall::SC_readlink_params*> user_params)
|
|
{
|
|
REQUIRE_PROMISE(rpath);
|
|
|
|
Syscall::SC_readlink_params params;
|
|
if (!copy_from_user(¶ms, user_params))
|
|
return EFAULT;
|
|
|
|
auto path = get_syscall_path_argument(params.path);
|
|
if (path.is_error())
|
|
return path.error();
|
|
|
|
auto result = VirtualFileSystem::the().open(path.value()->view(), O_RDONLY | O_NOFOLLOW_NOERROR, 0, current_directory());
|
|
if (result.is_error())
|
|
return result.error();
|
|
auto description = result.value();
|
|
|
|
if (!description->metadata().is_symlink())
|
|
return EINVAL;
|
|
|
|
auto contents = description->read_entire_file();
|
|
if (contents.is_error())
|
|
return contents.error();
|
|
|
|
auto& link_target = *contents.value();
|
|
auto size_to_copy = min(link_target.size(), params.buffer.size);
|
|
if (!copy_to_user(params.buffer.data, link_target.data(), size_to_copy))
|
|
return EFAULT;
|
|
// Note: we return the whole size here, not the copied size.
|
|
return link_target.size();
|
|
}
|
|
|
|
}
|