mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 03:02:45 +00:00
86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/*
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* Copyright (c) 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/Try.h>
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#include <LibCore/AnonymousBuffer.h>
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#include <LibIPC/File.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#if defined(__serenity__)
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# include <serenity.h>
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#endif
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#if defined(__linux__) && !defined(MFD_CLOEXEC)
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# include <linux/memfd.h>
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# include <sys/syscall.h>
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static int memfd_create(const char* name, unsigned int flags)
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{
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return syscall(SYS_memfd_create, name, flags);
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}
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#endif
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namespace Core {
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ErrorOr<AnonymousBuffer> AnonymousBuffer::create_with_size(size_t size)
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{
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int fd = -1;
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#if defined(__serenity__)
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fd = anon_create(round_up_to_power_of_two(size, PAGE_SIZE), O_CLOEXEC);
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if (fd < 0)
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return Error::from_errno(errno);
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#elif defined(__linux__)
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fd = memfd_create("", MFD_CLOEXEC);
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if (fd < 0)
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return Error::from_errno(errno);
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if (ftruncate(fd, size) < 0) {
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close(fd);
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return Error::from_errno(errno);
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}
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#endif
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if (fd < 0)
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return Error::from_errno(errno);
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return create_from_anon_fd(fd, size);
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}
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ErrorOr<NonnullRefPtr<AnonymousBufferImpl>> AnonymousBufferImpl::create(int fd, size_t size)
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{
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auto* data = mmap(nullptr, round_up_to_power_of_two(size, PAGE_SIZE), PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
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if (data == MAP_FAILED)
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return Error::from_errno(errno);
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return AK::adopt_nonnull_ref_or_enomem(new (nothrow) AnonymousBufferImpl(fd, size, data));
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}
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AnonymousBufferImpl::~AnonymousBufferImpl()
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{
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if (m_fd != -1) {
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auto rc = close(m_fd);
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VERIFY(rc == 0);
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}
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auto rc = munmap(m_data, round_up_to_power_of_two(m_size, PAGE_SIZE));
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VERIFY(rc == 0);
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}
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ErrorOr<AnonymousBuffer> AnonymousBuffer::create_from_anon_fd(int fd, size_t size)
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{
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auto impl = TRY(AnonymousBufferImpl::create(fd, size));
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return AnonymousBuffer(move(impl));
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}
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AnonymousBuffer::AnonymousBuffer(NonnullRefPtr<AnonymousBufferImpl> impl)
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: m_impl(move(impl))
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{
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}
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AnonymousBufferImpl::AnonymousBufferImpl(int fd, size_t size, void* data)
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: m_fd(fd)
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, m_size(size)
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, m_data(data)
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{
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}
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}
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