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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/MappedFile.h>
#include <AK/ScopeGuard.h>
#include <AK/String.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
namespace AK {
Result<NonnullRefPtr<MappedFile>, OSError> MappedFile::map(const String& path)
{
int fd = open(path.characters(), O_RDONLY | O_CLOEXEC, 0);
if (fd < 0)
return OSError(errno);
ScopeGuard fd_close_guard = [fd] {
close(fd);
};
struct stat st;
if (fstat(fd, &st) < 0) {
auto saved_errno = errno;
return OSError(saved_errno);
}
auto size = st.st_size;
auto* ptr = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED)
return OSError(errno);
return adopt(*new MappedFile(ptr, size));
}
MappedFile::MappedFile(void* ptr, size_t size)
: m_data(ptr)
, m_size(size)
{
}
MappedFile::~MappedFile()
{
auto rc = munmap(m_data, m_size);
VERIFY(rc == 0);
}
}
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