2010-09-11 01:45:59 +04:00
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/* -*- 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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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Jones <jones.chris.g@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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2010-10-29 23:22:28 +04:00
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#include <linux/ashmem.h>
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2010-09-11 01:45:59 +04:00
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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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2010-11-05 10:17:07 +03:00
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, mAllocSize(0)
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2010-09-11 01:45:59 +04:00
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, mSize(0)
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, mMemory(nsnull)
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{ }
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SharedMemoryBasic::SharedMemoryBasic(const Handle& aHandle)
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: mShmFd(aHandle.fd)
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2010-11-05 10:17:07 +03:00
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, mAllocSize(0)
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2010-09-11 01:45:59 +04:00
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, mSize(0)
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, mMemory(nsnull)
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{ }
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SharedMemoryBasic::~SharedMemoryBasic()
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{
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Unmap();
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2010-11-05 10:17:07 +03:00
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Destroy();
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2010-09-11 01:45:59 +04:00
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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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NS_ABORT_IF_FALSE(-1 == mShmFd, "Already Create()d");
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// Carve a new instance off of /dev/ashmem
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2010-10-29 23:22:28 +04:00
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int shmfd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
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2010-09-11 01:45:59 +04:00
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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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2010-11-05 10:17:07 +03:00
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mAllocSize = aNbytes;
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2010-09-11 01:45:59 +04:00
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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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NS_ABORT_IF_FALSE(nsnull == mMemory, "Already Map()d");
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mMemory = mmap(nsnull, 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 = nsnull;
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return false;
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}
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mSize = nBytes;
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return true;
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}
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bool
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SharedMemoryBasic::ShareToProcess(base::ProcessHandle/*unused*/,
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Handle* aNewHandle)
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{
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NS_ABORT_IF_FALSE(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, mSize)) {
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LogError("ShmemAndroid::Unmap()");
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}
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mMemory = nsnull;
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mSize = 0;
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}
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2010-11-05 10:17:07 +03:00
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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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2010-09-11 01:45:59 +04:00
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} // namespace ipc
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} // namespace mozilla
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