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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/*
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* Copyright (c) 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 <LibCore/AnonymousBuffer.h>
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#include <LibIPC/Decoder.h>
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#include <LibIPC/Encoder.h>
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#include <LibIPC/File.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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#if defined(__serenity__)
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# include <Kernel/API/Syscall.h>
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# include <serenity.h>
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#endif
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namespace Core {
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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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perror("anon_create");
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return {};
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}
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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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perror("memfd_create");
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return {};
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}
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if (ftruncate(fd, size) < 0) {
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perror("ftruncate");
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return {};
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}
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#endif
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if (fd < 0)
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return {};
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return create_from_anon_fd(fd, size);
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}
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RefPtr<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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perror("mmap");
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return {};
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}
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return adopt(*new 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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ASSERT(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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ASSERT(rc == 0);
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}
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AnonymousBuffer AnonymousBuffer::create_from_anon_fd(int fd, size_t size)
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{
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auto impl = AnonymousBufferImpl::create(fd, size);
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if (!impl)
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return {};
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return AnonymousBuffer(impl.release_nonnull());
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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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AnonymousBuffer::~AnonymousBuffer()
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{
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}
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}
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