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- // Copyright 2022 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/memory/platform_shared_memory_mapper.h"
- #include "base/logging.h"
- #include <mach/vm_map.h>
- #include "base/mac/mach_logging.h"
- namespace base {
- absl::optional<span<uint8_t>> PlatformSharedMemoryMapper::Map(
- subtle::PlatformSharedMemoryHandle handle,
- bool write_allowed,
- uint64_t offset,
- size_t size) {
- vm_prot_t vm_prot_write = write_allowed ? VM_PROT_WRITE : 0;
- vm_address_t address = 0;
- kern_return_t kr = vm_map(mach_task_self(),
- &address, // Output parameter
- size,
- 0, // Alignment mask
- VM_FLAGS_ANYWHERE, handle, offset,
- FALSE, // Copy
- VM_PROT_READ | vm_prot_write, // Current protection
- VM_PROT_READ | vm_prot_write, // Maximum protection
- VM_INHERIT_NONE);
- if (kr != KERN_SUCCESS) {
- MACH_DLOG(ERROR, kr) << "vm_map";
- return absl::nullopt;
- }
- return make_span(reinterpret_cast<uint8_t*>(address), size);
- }
- void PlatformSharedMemoryMapper::Unmap(span<uint8_t> mapping) {
- kern_return_t kr = vm_deallocate(
- mach_task_self(), reinterpret_cast<vm_address_t>(mapping.data()),
- mapping.size());
- MACH_DLOG_IF(ERROR, kr != KERN_SUCCESS, kr) << "vm_deallocate";
- }
- } // namespace base
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