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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
44 lines
1.3 KiB
C++
44 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/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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Syscall::SC_realpath_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 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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if (!copy_to_user(params.buffer.data, absolute_path->characters(), 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 ideal_size;
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};
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}
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