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https://github.com/RGBCube/serenity
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39 lines
1.2 KiB
C++
39 lines
1.2 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/Custody.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$realpath(Userspace<const Syscall::SC_realpath_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 = 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 custody_or_error = VirtualFileSystem::the().resolve_path(path.value()->view(), current_directory());
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& custody = custody_or_error.value();
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auto absolute_path = custody->try_create_absolute_path();
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if (!absolute_path)
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return ENOMEM;
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size_t ideal_size = absolute_path->length() + 1;
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auto size_to_copy = min(ideal_size, params.buffer.size);
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TRY(copy_to_user(params.buffer.data, absolute_path->characters(), size_to_copy));
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// Note: we return the whole size here, not the copied size.
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return ideal_size;
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};
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}
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