gecko-dev/ipc/glue/SharedMemory_posix.cpp

71 lines
2.3 KiB
C++

/* -*- 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,
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* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla IPC.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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
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* ***** END LICENSE BLOCK ***** */
#include <sys/mman.h> // mprotect
#include <unistd.h> // sysconf
#include "mozilla/ipc/SharedMemory.h"
namespace mozilla {
namespace ipc {
void
SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights)
{
int flags = 0;
if (aRights & RightsRead)
flags |= PROT_READ;
if (aRights & RightsWrite)
flags |= PROT_WRITE;
if (RightsNone == aRights)
flags = PROT_NONE;
if (0 < mprotect(aAddr, aSize, flags))
NS_RUNTIMEABORT("can't mprotect()");
}
size_t
SharedMemory::SystemPageSize()
{
return sysconf(_SC_PAGESIZE);
}
} // namespace ipc
} // namespace mozilla