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- /*
- * Copyright (c) 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 <LibCore/AnonymousBuffer.h>
- #include <LibIPC/Decoder.h>
- #include <LibIPC/Encoder.h>
- #include <LibIPC/File.h>
- #include <fcntl.h>
- #include <stdio.h>
- #include <sys/mman.h>
- #if defined(__serenity__)
- # include <serenity.h>
- #endif
- #if defined(__linux__) && !defined(MFD_CLOEXEC)
- # include <linux/memfd.h>
- # include <sys/syscall.h>
- static int memfd_create(const char* name, unsigned int flags)
- {
- return syscall(SYS_memfd_create, name, flags);
- }
- #endif
- namespace Core {
- AnonymousBuffer AnonymousBuffer::create_with_size(size_t size)
- {
- int fd = -1;
- #if defined(__serenity__)
- fd = anon_create(round_up_to_power_of_two(size, PAGE_SIZE), O_CLOEXEC);
- if (fd < 0) {
- perror("anon_create");
- return {};
- }
- #elif defined(__linux__)
- fd = memfd_create("", MFD_CLOEXEC);
- if (fd < 0) {
- perror("memfd_create");
- return {};
- }
- if (ftruncate(fd, size) < 0) {
- close(fd);
- perror("ftruncate");
- return {};
- }
- #endif
- if (fd < 0)
- return {};
- return create_from_anon_fd(fd, size);
- }
- RefPtr<AnonymousBufferImpl> AnonymousBufferImpl::create(int fd, size_t size)
- {
- auto* data = mmap(nullptr, round_up_to_power_of_two(size, PAGE_SIZE), PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
- if (data == MAP_FAILED) {
- perror("mmap");
- return {};
- }
- return adopt(*new AnonymousBufferImpl(fd, size, data));
- }
- AnonymousBufferImpl::~AnonymousBufferImpl()
- {
- if (m_fd != -1) {
- auto rc = close(m_fd);
- VERIFY(rc == 0);
- }
- auto rc = munmap(m_data, round_up_to_power_of_two(m_size, PAGE_SIZE));
- VERIFY(rc == 0);
- }
- AnonymousBuffer AnonymousBuffer::create_from_anon_fd(int fd, size_t size)
- {
- auto impl = AnonymousBufferImpl::create(fd, size);
- if (!impl)
- return {};
- return AnonymousBuffer(impl.release_nonnull());
- }
- AnonymousBuffer::AnonymousBuffer(NonnullRefPtr<AnonymousBufferImpl> impl)
- : m_impl(move(impl))
- {
- }
- AnonymousBufferImpl::AnonymousBufferImpl(int fd, size_t size, void* data)
- : m_fd(fd)
- , m_size(size)
- , m_data(data)
- {
- }
- AnonymousBuffer::~AnonymousBuffer()
- {
- }
- }
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