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99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/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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//#define DEBUG_MAPPED_FILE
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namespace AK {
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MappedFile::MappedFile(const StringView& file_name)
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{
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int fd = open_with_path_length(file_name.characters_without_null_termination(), file_name.length(), O_RDONLY | O_CLOEXEC, 0);
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if (fd == -1) {
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m_errno = errno;
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perror("open");
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return;
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}
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struct stat st;
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fstat(fd, &st);
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m_size = st.st_size;
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m_map = mmap(nullptr, m_size, PROT_READ, MAP_SHARED, fd, 0);
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if (m_map == MAP_FAILED) {
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m_errno = errno;
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perror("mmap");
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}
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#ifdef DEBUG_MAPPED_FILE
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dbgprintf("MappedFile{%s} := { fd=%d, m_size=%u, m_map=%p }\n", file_name.characters(), fd, m_size, m_map);
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#endif
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close(fd);
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}
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MappedFile::~MappedFile()
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{
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unmap();
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}
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void MappedFile::unmap()
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{
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if (!is_valid())
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return;
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int rc = munmap(m_map, m_size);
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ASSERT(rc == 0);
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m_size = 0;
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m_map = (void*)-1;
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}
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MappedFile::MappedFile(MappedFile&& other)
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: m_size(other.m_size)
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, m_map(other.m_map)
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{
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other.m_size = 0;
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other.m_map = (void*)-1;
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}
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MappedFile& MappedFile::operator=(MappedFile&& other)
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{
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if (this == &other)
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return *this;
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unmap();
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swap(m_size, other.m_size);
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swap(m_map, other.m_map);
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return *this;
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}
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}
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