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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
33 lines
1.0 KiB
C++
33 lines
1.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$readlink(Userspace<const Syscall::SC_readlink_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(rpath);
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auto params = TRY(copy_typed_from_user(user_params));
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auto path = TRY(get_syscall_path_argument(params.path));
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auto description = TRY(VirtualFileSystem::the().open(path->view(), O_RDONLY | O_NOFOLLOW_NOERROR, 0, current_directory()));
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if (!description->metadata().is_symlink())
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return EINVAL;
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auto link_target = TRY(description->read_entire_file());
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auto size_to_copy = min(link_target->size(), params.buffer.size);
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TRY(copy_to_user(params.buffer.data, link_target->data(), size_to_copy));
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// Note: we return the whole size here, not the copied size.
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return link_target->size();
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}
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}
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