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https://github.com/RGBCube/serenity
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2a78bf8596
The Process::Handler type has KResultOr<FlatPtr> as its return type. Using a different return type with an equally-sized template parameter sort of works but breaks once that condition is no longer true, e.g. for KResultOr<int> on x86_64. Ideally the syscall handlers would also take FlatPtrs as their args so we can get rid of the reinterpret_cast for the function pointer but I didn't quite feel like cleaning that up as well.
46 lines
1.3 KiB
C++
46 lines
1.3 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/FileDescription.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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KResultOr<FlatPtr> Process::sys$readlink(Userspace<const Syscall::SC_readlink_params*> user_params)
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{
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REQUIRE_PROMISE(rpath);
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Syscall::SC_readlink_params params;
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if (!copy_from_user(¶ms, user_params))
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return EFAULT;
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auto path = get_syscall_path_argument(params.path);
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if (path.is_error())
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return path.error();
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auto result = VFS::the().open(path.value()->view(), O_RDONLY | O_NOFOLLOW_NOERROR, 0, current_directory());
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if (result.is_error())
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return result.error();
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auto description = result.value();
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if (!description->metadata().is_symlink())
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return EINVAL;
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auto contents = description->read_entire_file();
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if (contents.is_error())
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return contents.error();
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auto& link_target = *contents.value();
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auto size_to_copy = min(link_target.size(), params.buffer.size);
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if (!copy_to_user(params.buffer.data, link_target.data(), size_to_copy))
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return EFAULT;
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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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