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2f3b901f7f
Let's adapt this class a bit better to how it's actually being used. Instead of having valid/invalid states and storing an error in case it's invalid, a MappedFile is now always valid, and the factory function that creates it will return an OSError if mapping fails.
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/MappedFile.h>
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#include <AK/ScopeGuard.h>
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#include <AK/String.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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namespace AK {
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Result<NonnullRefPtr<MappedFile>, OSError> MappedFile::map(const StringView& path)
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{
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int fd = open_with_path_length(path.characters_without_null_termination(), path.length(), O_RDONLY | O_CLOEXEC, 0);
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if (fd < 0)
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return OSError(errno);
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ScopeGuard fd_close_guard = [fd] {
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close(fd);
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};
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struct stat st;
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if (fstat(fd, &st) < 0) {
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auto saved_errno = errno;
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return OSError(saved_errno);
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}
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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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if (ptr == MAP_FAILED)
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return OSError(errno);
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return adopt(*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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auto rc = munmap(m_data, m_size);
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ASSERT(rc == 0);
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}
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}
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