зеркало из https://github.com/mozilla/pjs.git
198 строки
4.4 KiB
C++
198 строки
4.4 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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/* ***** 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 IPC.
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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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*
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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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#ifndef mozilla_ipc_SharedMemorySysV_h
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#define mozilla_ipc_SharedMemorySysV_h
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#ifdef OS_LINUX
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// SysV shared memory isn't available on Windows, but we define the
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// following macro so that #ifdefs are clearer (compared to #ifdef
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// OS_LINUX).
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#define MOZ_HAVE_SHAREDMEMORYSYSV
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#include "SharedMemory.h"
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#include "nsDebug.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/ipc.h>
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#include <sys/shm.h>
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//
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// This is a low-level wrapper around platform shared memory. Don't
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// use it directly; use Shmem allocated through IPDL interfaces.
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//
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namespace mozilla {
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namespace ipc {
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class SharedMemorySysV : public SharedMemory
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{
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public:
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typedef int Handle;
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SharedMemorySysV() :
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mHandle(-1),
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mData(nsnull),
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mSize(0)
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{
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}
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SharedMemorySysV(Handle aHandle) :
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mHandle(aHandle),
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mData(nsnull),
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mSize(0)
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{
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}
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virtual ~SharedMemorySysV()
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{
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shmdt(mData);
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mHandle = -1;
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mData = nsnull;
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mSize = 0;
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}
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NS_OVERRIDE
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virtual bool Create(size_t aNbytes)
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{
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int id = shmget(IPC_PRIVATE, aNbytes, IPC_CREAT | 0600);
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if (id == -1)
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return false;
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mHandle = id;
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if (!Map(aNbytes))
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return false;
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return true;
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}
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NS_OVERRIDE
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virtual bool Map(size_t nBytes)
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{
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// already mapped
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if (mData)
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return true;
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if (!IsHandleValid(mHandle))
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return false;
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void* mem = shmat(mHandle, nsnull, 0);
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if (mem == (void*) -1) {
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char warning[256];
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snprintf(warning, sizeof(warning)-1,
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"shmat(): %s (%d)\n", strerror(errno), errno);
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NS_WARNING(warning);
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return false;
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}
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// Mark the handle as deleted so that, should this process go away, the
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// segment is cleaned up.
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shmctl(mHandle, IPC_RMID, 0);
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mData = mem;
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mSize = nBytes;
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#ifdef NS_DEBUG
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struct shmid_ds info;
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if (shmctl(mHandle, IPC_STAT, &info) < 0)
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return false;
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NS_ABORT_IF_FALSE(nBytes <= info.shm_segsz,
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"Segment doesn't have enough space!");
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#endif
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return true;
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}
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NS_OVERRIDE
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virtual size_t Size() const
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{
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return mSize;
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}
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NS_OVERRIDE
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virtual void* memory() const
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{
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return mData;
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}
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NS_OVERRIDE
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virtual SharedMemoryType Type() const
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{
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return TYPE_SYSV;
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}
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Handle GetHandle() const
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{
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NS_ABORT_IF_FALSE(IsHandleValid(mHandle), "invalid handle");
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return mHandle;
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}
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static Handle NULLHandle()
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{
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return -1;
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}
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static bool IsHandleValid(Handle aHandle)
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{
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return aHandle != -1;
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}
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private:
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Handle mHandle;
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void* mData;
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size_t mSize;
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // OS_LINUX
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#endif // ifndef mozilla_ipc_SharedMemorySysV_h
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