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b91c49364d
This makes it more symmetrical with adopt_own() (which is used to create a NonnullOwnPtr from the result of a naked new.)
56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 <errno.h>
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#include <fcntl.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 String& path)
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{
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int fd = open(path.characters(), 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_ref(*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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VERIFY(rc == 0);
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}
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}
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