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50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2021, 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/ScopeGuard.h>
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#include <AK/String.h>
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#include <LibCore/MappedFile.h>
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#include <LibCore/System.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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namespace Core {
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ErrorOr<NonnullRefPtr<MappedFile>> MappedFile::map(String const& path)
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{
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auto fd = TRY(Core::System::open(path, O_RDONLY | O_CLOEXEC, 0));
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return map_from_fd_and_close(fd, path);
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}
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ErrorOr<NonnullRefPtr<MappedFile>> MappedFile::map_from_fd_and_close(int fd, [[maybe_unused]] String const& path)
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{
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TRY(Core::System::fcntl(fd, F_SETFD, FD_CLOEXEC));
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ScopeGuard fd_close_guard = [fd] {
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close(fd);
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};
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auto stat = TRY(Core::System::fstat(fd));
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auto size = stat.st_size;
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auto* ptr = TRY(Core::System::mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0, 0, path));
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return adopt_ref(*new MappedFile(ptr, size));
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}
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MappedFile::MappedFile(void* ptr, size_t size)
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: m_data(ptr)
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, m_size(size)
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{
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}
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MappedFile::~MappedFile()
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{
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MUST(Core::System::munmap(m_data, m_size));
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}
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}
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