pjs/ipc/glue/SharedMemoryBasic_android.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#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)
, mAllocSize(0)
, mSize(0)
, mMemory(nsnull)
{ }
SharedMemoryBasic::SharedMemoryBasic(const Handle& aHandle)
: mShmFd(aHandle.fd)
, mAllocSize(0)
, mSize(0)
, mMemory(nsnull)
{ }
SharedMemoryBasic::~SharedMemoryBasic()
{
Unmap();
Destroy();
}
bool
SharedMemoryBasic::Create(size_t aNbytes)
{
NS_ABORT_IF_FALSE(-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;
mAllocSize = aNbytes;
return true;
}
bool
SharedMemoryBasic::Map(size_t nBytes)
{
NS_ABORT_IF_FALSE(nsnull == mMemory, "Already Map()d");
mMemory = mmap(nsnull, nBytes,
PROT_READ | PROT_WRITE,
MAP_SHARED,
mShmFd,
0);
if (MAP_FAILED == mMemory) {
LogError("ShmemAndroid::Map()");
mMemory = nsnull;
return false;
}
mSize = nBytes;
return true;
}
bool
SharedMemoryBasic::ShareToProcess(base::ProcessHandle/*unused*/,
Handle* aNewHandle)
{
NS_ABORT_IF_FALSE(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, mSize)) {
LogError("ShmemAndroid::Unmap()");
}
mMemory = nsnull;
mSize = 0;
}
void
SharedMemoryBasic::Destroy()
{
if (mShmFd > 0) {
close(mShmFd);
}
}
} // namespace ipc
} // namespace mozilla