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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
31 lines
1 KiB
C++
31 lines
1 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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ErrorOr<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(Pledge::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 custody = TRY(VirtualFileSystem::the().resolve_path(path->view(), current_directory()));
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auto absolute_path = TRY(custody->try_serialize_absolute_path());
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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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