зеркало из https://github.com/mozilla/gecko-dev.git
126 строки
2.9 KiB
C++
126 строки
2.9 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"
|
|
|
|
//
|
|
// Temporarily go directly to the kernel interface until we can
|
|
// interact better with libcutils.
|
|
//
|
|
#include <linux/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(const Handle& aHandle, OpenRights aRights) {
|
|
MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
|
|
mShmFd = aHandle.fd;
|
|
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 = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
|
|
if (-1 == shmfd) {
|
|
LogError("ShmemAndroid::Create():open");
|
|
return false;
|
|
}
|
|
|
|
if (ioctl(shmfd, ASHMEM_SET_SIZE, aNbytes)) {
|
|
LogError("ShmemAndroid::Unmap():ioctl(SET_SIZE)");
|
|
close(shmfd);
|
|
return false;
|
|
}
|
|
|
|
mShmFd = shmfd;
|
|
Created(aNbytes);
|
|
return true;
|
|
}
|
|
|
|
bool SharedMemoryBasic::Map(size_t nBytes) {
|
|
MOZ_ASSERT(nullptr == mMemory, "Already Map()d");
|
|
|
|
int prot = PROT_READ;
|
|
if (mOpenRights == RightsReadWrite) {
|
|
prot |= PROT_WRITE;
|
|
}
|
|
|
|
mMemory = mmap(nullptr, nBytes, prot, MAP_SHARED, mShmFd, 0);
|
|
if (MAP_FAILED == mMemory) {
|
|
LogError("ShmemAndroid::Map()");
|
|
mMemory = nullptr;
|
|
return false;
|
|
}
|
|
|
|
Mapped(nBytes);
|
|
return true;
|
|
}
|
|
|
|
bool SharedMemoryBasic::ShareToProcess(base::ProcessId /*unused*/,
|
|
Handle* aNewHandle) {
|
|
MOZ_ASSERT(mShmFd >= 0, "Should have been Create()d by now");
|
|
|
|
int shmfdDup = dup(mShmFd);
|
|
if (-1 == shmfdDup) {
|
|
LogError("ShmemAndroid::ShareToProcess()");
|
|
return false;
|
|
}
|
|
|
|
aNewHandle->fd = shmfdDup;
|
|
aNewHandle->auto_close = true;
|
|
return true;
|
|
}
|
|
|
|
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
|