137 lines
2.7 KiB
C++
137 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <android/log.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "base/process_util.h"
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#include "SharedMemoryBasic.h"
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//
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// Temporarily go directly to the kernel interface until we can
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// interact better with libcutils.
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//
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#include <linux/ashmem.h>
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namespace mozilla {
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namespace ipc {
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static void
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LogError(const char* what)
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{
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__android_log_print(ANDROID_LOG_ERROR, "Gecko",
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"%s: %s (%d)", what, strerror(errno), errno);
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}
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SharedMemoryBasic::SharedMemoryBasic()
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: mShmFd(-1)
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, mMemory(nullptr)
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{ }
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SharedMemoryBasic::SharedMemoryBasic(const Handle& aHandle)
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: mShmFd(aHandle.fd)
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, mMemory(nullptr)
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{ }
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SharedMemoryBasic::~SharedMemoryBasic()
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{
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Unmap();
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Destroy();
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}
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bool
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SharedMemoryBasic::Create(size_t aNbytes)
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{
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MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
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// Carve a new instance off of /dev/ashmem
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int shmfd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
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if (-1 == shmfd) {
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LogError("ShmemAndroid::Create():open");
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return false;
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}
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if (ioctl(shmfd, ASHMEM_SET_SIZE, aNbytes)) {
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LogError("ShmemAndroid::Unmap():ioctl(SET_SIZE)");
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close(shmfd);
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return false;
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}
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mShmFd = shmfd;
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Created(aNbytes);
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return true;
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}
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bool
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SharedMemoryBasic::Map(size_t nBytes)
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{
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MOZ_ASSERT(nullptr == mMemory, "Already Map()d");
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mMemory = mmap(nullptr, nBytes,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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mShmFd,
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0);
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if (MAP_FAILED == mMemory) {
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LogError("ShmemAndroid::Map()");
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mMemory = nullptr;
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return false;
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}
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Mapped(nBytes);
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return true;
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}
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bool
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SharedMemoryBasic::ShareToProcess(base::ProcessId/*unused*/,
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Handle* aNewHandle)
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{
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MOZ_ASSERT(mShmFd >= 0, "Should have been Create()d by now");
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int shmfdDup = dup(mShmFd);
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if (-1 == shmfdDup) {
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LogError("ShmemAndroid::ShareToProcess()");
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return false;
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}
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aNewHandle->fd = shmfdDup;
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aNewHandle->auto_close = true;
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return true;
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}
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void
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SharedMemoryBasic::Unmap()
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{
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if (!mMemory) {
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return;
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}
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if (munmap(mMemory, Size())) {
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LogError("ShmemAndroid::Unmap()");
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}
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mMemory = nullptr;
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}
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void
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SharedMemoryBasic::Destroy()
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{
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if (mShmFd > 0) {
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close(mShmFd);
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}
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}
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} // namespace ipc
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} // namespace mozilla
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