2020-01-18 08:38:21 +00:00
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/*
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2021-01-10 14:55:54 +00:00
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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2020-01-18 08:38:21 +00:00
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*
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2021-04-22 08:24:48 +00:00
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* SPDX-License-Identifier: BSD-2-Clause
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2020-01-18 08:38:21 +00:00
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*/
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2022-12-04 18:02:33 +00:00
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#include <AK/DeprecatedString.h>
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2021-01-10 14:55:54 +00:00
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#include <AK/ScopeGuard.h>
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2021-11-23 10:32:25 +00:00
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#include <LibCore/MappedFile.h>
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2021-11-23 10:36:00 +00:00
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#include <LibCore/System.h>
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2019-05-28 09:53:16 +00:00
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#include <fcntl.h>
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2018-10-10 09:53:07 +00:00
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#include <sys/mman.h>
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2019-04-03 11:51:49 +00:00
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#include <unistd.h>
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2018-10-10 09:53:07 +00:00
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2021-11-23 10:32:25 +00:00
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namespace Core {
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2018-10-10 09:53:07 +00:00
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2022-06-13 15:08:18 +00:00
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ErrorOr<NonnullRefPtr<MappedFile>> MappedFile::map(StringView path)
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2018-10-10 09:53:07 +00:00
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{
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2021-11-23 10:59:54 +00:00
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auto fd = TRY(Core::System::open(path, O_RDONLY | O_CLOEXEC, 0));
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2021-08-06 01:47:55 +00:00
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return map_from_fd_and_close(fd, path);
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}
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2022-06-13 15:08:18 +00:00
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ErrorOr<NonnullRefPtr<MappedFile>> MappedFile::map_from_fd_and_close(int fd, [[maybe_unused]] StringView path)
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2021-08-06 01:47:55 +00:00
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{
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2021-11-23 10:36:00 +00:00
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TRY(Core::System::fcntl(fd, F_SETFD, FD_CLOEXEC));
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2021-08-06 01:47:55 +00:00
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2021-01-10 14:55:54 +00:00
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ScopeGuard fd_close_guard = [fd] {
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close(fd);
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};
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2018-10-10 09:53:07 +00:00
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2021-11-23 10:36:00 +00:00
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auto stat = TRY(Core::System::fstat(fd));
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auto size = stat.st_size;
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2019-08-05 12:26:56 +00:00
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2021-11-23 10:51:46 +00:00
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auto* ptr = TRY(Core::System::mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0, 0, path));
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2021-07-29 13:00:26 +00:00
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2021-04-23 14:46:57 +00:00
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return adopt_ref(*new MappedFile(ptr, size));
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2018-10-10 09:53:07 +00:00
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}
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2021-01-10 14:55:54 +00:00
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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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2018-10-10 09:53:07 +00:00
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{
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}
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2021-01-10 14:55:54 +00:00
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MappedFile::~MappedFile()
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2019-04-03 11:51:49 +00:00
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{
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2022-11-20 03:23:14 +00:00
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auto res = Core::System::munmap(m_data, m_size);
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if (res.is_error())
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dbgln("Failed to unmap MappedFile (@ {:p}): {}", m_data, res.error());
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2019-04-03 11:51:49 +00:00
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}
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2018-10-10 09:53:07 +00:00
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}
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