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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2019-04-03 11:51:49 +00:00
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#include <AK/MappedFile.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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2020-07-30 22:13:15 +00:00
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#include <AK/String.h>
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2021-03-12 16:29:37 +00:00
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#include <errno.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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#include <sys/stat.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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namespace AK {
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2021-11-06 23:37:07 +00:00
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ErrorOr<NonnullRefPtr<MappedFile>> MappedFile::map(String const& path)
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2018-10-10 09:53:07 +00:00
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{
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2021-01-12 18:21:59 +00:00
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int fd = open(path.characters(), O_RDONLY | O_CLOEXEC, 0);
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2021-01-10 14:55:54 +00:00
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if (fd < 0)
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2021-11-06 23:37:07 +00:00
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return Error::from_errno(errno);
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2019-05-28 09:53:16 +00:00
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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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2021-11-06 23:37:07 +00:00
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ErrorOr<NonnullRefPtr<MappedFile>> MappedFile::map_from_fd_and_close(int fd, [[maybe_unused]] String const& path)
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2021-08-06 01:47:55 +00:00
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{
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2021-11-06 23:37:07 +00:00
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
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return Error::from_errno(errno);
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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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2019-08-05 12:26:56 +00:00
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struct stat st;
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2021-11-06 23:37:07 +00:00
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if (fstat(fd, &st) < 0)
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return Error::from_errno(errno);
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2019-08-05 12:26:56 +00:00
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2021-01-10 14:55:54 +00:00
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auto size = st.st_size;
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auto* ptr = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0);
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2019-08-05 12:26:56 +00:00
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2021-01-10 14:55:54 +00:00
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if (ptr == MAP_FAILED)
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2021-11-06 23:37:07 +00:00
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return Error::from_errno(errno);
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2019-04-03 11:51:49 +00:00
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2021-07-29 13:00:26 +00:00
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#ifdef __serenity__
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if (set_mmap_name(ptr, size, path.characters()) < 0) {
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perror("set_mmap_name");
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}
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#endif
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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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2021-01-10 14:55:54 +00:00
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auto rc = munmap(m_data, m_size);
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2021-02-23 19:42:32 +00:00
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VERIFY(rc == 0);
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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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