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// Copyright 2014 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 "third_party/mojo/src/mojo/edk/embedder/simple_platform_shared_buffer.h"
#include <stdint.h>
#include <sys/mman.h> // For |PROT_...|.
#include <sys/types.h> // For |off_t|.
#include <limits>
#include <utility>
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "third_party/ashmem/ashmem.h"
#include "third_party/mojo/src/mojo/edk/embedder/platform_handle.h"
namespace mojo {
namespace embedder {
// SimplePlatformSharedBuffer --------------------------------------------------
bool SimplePlatformSharedBuffer::Init() {
DCHECK(!handle_.is_valid());
if (static_cast<uint64_t>(num_bytes_) >
static_cast<uint64_t>(std::numeric_limits<off_t>::max())) {
return false;
}
base::ScopedFD fd(ashmem_create_region(nullptr, num_bytes_));
if (!fd.is_valid()) {
DPLOG(ERROR) << "ashmem_create_region()";
return false;
}
if (ashmem_set_prot_region(fd.get(), PROT_READ | PROT_WRITE) < 0) {
DPLOG(ERROR) << "ashmem_set_prot_region()";
return false;
}
handle_.reset(PlatformHandle(fd.release()));
return true;
}
bool SimplePlatformSharedBuffer::InitFromPlatformHandle(
ScopedPlatformHandle platform_handle) {
DCHECK(!handle_.is_valid());
if (static_cast<uint64_t>(num_bytes_) >
static_cast<uint64_t>(std::numeric_limits<off_t>::max())) {
return false;
}
int size = ashmem_get_size_region(platform_handle.get().fd);
if (size < 0) {
DPLOG(ERROR) << "ashmem_get_size_region()";
return false;
}
if (static_cast<size_t>(size) != num_bytes_) {
LOG(ERROR) << "Shared memory region has the wrong size";
return false;
}
handle_ = std::move(platform_handle);
return true;
}
} // namespace embedder
} // namespace mojo
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