mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-11 16:32:59 +00:00
133 lines
3.1 KiB
C++
133 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include <android/log.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "base/process_util.h"
|
|
|
|
#include "SharedMemoryBasic.h"
|
|
|
|
#include "mozilla/Ashmem.h"
|
|
|
|
namespace mozilla {
|
|
namespace ipc {
|
|
|
|
static void LogError(const char* what) {
|
|
__android_log_print(ANDROID_LOG_ERROR, "Gecko", "%s: %s (%d)", what,
|
|
strerror(errno), errno);
|
|
}
|
|
|
|
SharedMemoryBasic::SharedMemoryBasic()
|
|
: mShmFd(-1), mMemory(nullptr), mOpenRights(RightsReadWrite) {}
|
|
|
|
SharedMemoryBasic::~SharedMemoryBasic() {
|
|
Unmap();
|
|
CloseHandle();
|
|
}
|
|
|
|
bool SharedMemoryBasic::SetHandle(Handle aHandle, OpenRights aRights) {
|
|
MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
|
|
mShmFd = aHandle.release();
|
|
mOpenRights = aRights;
|
|
return true;
|
|
}
|
|
|
|
bool SharedMemoryBasic::Create(size_t aNbytes) {
|
|
MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
|
|
|
|
// Carve a new instance off of /dev/ashmem
|
|
int shmfd = mozilla::android::ashmem_create(nullptr, aNbytes);
|
|
if (-1 == shmfd) {
|
|
LogError("ShmemAndroid::Create():open");
|
|
return false;
|
|
}
|
|
|
|
mShmFd = shmfd;
|
|
Created(aNbytes);
|
|
return true;
|
|
}
|
|
|
|
bool SharedMemoryBasic::Map(size_t nBytes, void* fixed_address) {
|
|
MOZ_ASSERT(nullptr == mMemory, "Already Map()d");
|
|
|
|
int prot = PROT_READ;
|
|
if (mOpenRights == RightsReadWrite) {
|
|
prot |= PROT_WRITE;
|
|
}
|
|
|
|
// Don't use MAP_FIXED when a fixed_address was specified, since that can
|
|
// replace pages that are alread mapped at that address.
|
|
mMemory = mmap(fixed_address, nBytes, prot, MAP_SHARED, mShmFd, 0);
|
|
|
|
if (MAP_FAILED == mMemory) {
|
|
if (!fixed_address) {
|
|
LogError("ShmemAndroid::Map()");
|
|
}
|
|
mMemory = nullptr;
|
|
return false;
|
|
}
|
|
|
|
if (fixed_address && mMemory != fixed_address) {
|
|
if (munmap(mMemory, nBytes)) {
|
|
LogError("ShmemAndroid::Map():unmap");
|
|
mMemory = nullptr;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
Mapped(nBytes);
|
|
return true;
|
|
}
|
|
|
|
void* SharedMemoryBasic::FindFreeAddressSpace(size_t size) {
|
|
void* memory =
|
|
mmap(NULL, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|
munmap(memory, size);
|
|
return memory != (void*)-1 ? memory : NULL;
|
|
}
|
|
|
|
auto SharedMemoryBasic::CloneHandle() -> Handle {
|
|
MOZ_ASSERT(mShmFd >= 0, "Should have been Create()d by now");
|
|
|
|
int shmfdDup = dup(mShmFd);
|
|
if (-1 == shmfdDup) {
|
|
LogError("ShmemAndroid::CloneHandle()");
|
|
return nullptr;
|
|
}
|
|
|
|
return mozilla::UniqueFileHandle(shmfdDup);
|
|
}
|
|
|
|
void SharedMemoryBasic::Unmap() {
|
|
if (!mMemory) {
|
|
return;
|
|
}
|
|
|
|
if (munmap(mMemory, Size())) {
|
|
LogError("ShmemAndroid::Unmap()");
|
|
}
|
|
mMemory = nullptr;
|
|
}
|
|
|
|
void SharedMemoryBasic::CloseHandle() {
|
|
if (mShmFd != -1) {
|
|
close(mShmFd);
|
|
mShmFd = -1;
|
|
mOpenRights = RightsReadWrite;
|
|
}
|
|
}
|
|
|
|
} // namespace ipc
|
|
} // namespace mozilla
|