author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 19 Aug 2010 11:33:45 +0300 | |
branch | RCL_3 |
changeset 54 | 4332f0f7be53 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Implementation of CMmapMemoryNode |
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* |
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*/ |
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|
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// INCLUDES |
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#include <sys/shm.h> |
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#include <sys/ipc.h> |
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#include <sys/types.h> |
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#include <sys/mman.h> |
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#include <sys/errno.h> |
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#include <fcntl.h> |
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#include <liblogger.h> |
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#include "mmapmemorynode.h" |
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#include "sysreent.h" |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::CMmapMemoryNode |
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// C++ default constructor. |
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// ----------------------------------------------------------------------------- |
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// |
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CMmapMemoryNode::CMmapMemoryNode() |
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{ |
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iMapMem.fd = -1; |
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iMapMem.offset = 0; |
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iMapMem.len = 0; |
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iMapMem.flags = 0; |
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iMapMem.memid = 0; |
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iMapMem.addr = (NULL); |
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iMapMem.fdescaddr = (NULL) ; |
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iMapMem.maplen = 0; |
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} |
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::~CMmapMemoryNode |
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// C++ default destructor. |
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// ----------------------------------------------------------------------------- |
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// |
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CMmapMemoryNode::~CMmapMemoryNode() |
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{ |
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shmid_ds buf = |
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{ |
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{ 0,0,0,0,0,0,0 }, |
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0,0,0,0,0,0,0,0 |
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}; |
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// call shmdt and shmctl |
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int aErrno = 0; |
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if(!_shmdt_r(&aErrno, iMapMem.addr)) |
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{ |
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if(!_shmctl_r(&aErrno,iMapMem.memid, IPC_RMID, &buf)) |
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{ |
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/*done*/ |
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} |
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} |
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} |
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::NewL |
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// 1st phase Constructor |
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// ----------------------------------------------------------------------------- |
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// |
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CMmapMemoryNode* CMmapMemoryNode::NewL(size_t len, int flag, int shmflg, \ |
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int fildes, off_t offset, int& anErrno, size_t maplen) |
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{ |
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CMmapMemoryNode* self = new (ELeave) CMmapMemoryNode; |
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CleanupStack::PushL(self); |
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if(-1 == self->ConstructL(len, flag, shmflg, fildes, offset, anErrno, maplen)) |
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{ |
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CleanupStack::Pop(self); |
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self->iMapMem.addr = ((void *)-1); |
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return self; |
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} |
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CleanupStack::Pop(self); |
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return self; |
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} |
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::NewL |
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// 2nd phase constructor |
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// ----------------------------------------------------------------------------- |
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// |
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int CMmapMemoryNode::ConstructL(size_t len, int flag, int shmflg, int fildes, \ |
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off_t offset, int& anErrno, size_t maplen) |
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{ |
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int lshmid; |
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void* lmapaddr; |
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int readlen; |
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int retval = -1; |
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off_t cache; |
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108 |
|
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TInt aErrno = 0; |
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/* Using shared memory to allocate memory for required length */ |
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if((lshmid = _shmget_r(&aErrno,IPC_PRIVATE, len, shmflg)) > 0) |
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112 |
{ |
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lmapaddr = _shmat_r(&aErrno,lshmid, (void*)NULL, shmflg); |
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if((KErrNone == aErrno) && (-1 != (int)lmapaddr)) |
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115 |
{ |
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/*cache the current file position before seeking to new position*/ |
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cache = _lseek_r(&aErrno, fildes, 0, SEEK_CUR); |
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/*Seek in the file to required offset */ |
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if(offset == _lseek_r(&aErrno,fildes, offset, SEEK_SET)) |
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120 |
{ |
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//Zero fill the memory |
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memset(lmapaddr, 0, len); |
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/*Read the contents of the file to memory */ |
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readlen = _read_r(&aErrno,fildes, (char*)lmapaddr, maplen); |
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//TODO: To take care if EOF is hit while reading, i.e readlen == 0 |
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if(readlen <= len) |
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{ |
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iMapMem.fd = fildes; |
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iMapMem.offset = offset; |
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iMapMem.len = len; |
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iMapMem.flags = flag; |
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iMapMem.memid = lshmid; |
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iMapMem.addr = lmapaddr; |
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iMapMem.maplen = maplen; |
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retval = 0; |
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} |
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else if(-1 == readlen) |
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{ |
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anErrno = ENXIO; |
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retval = -1; |
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} |
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/*Now seek back to the original position*/ |
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_lseek_r(&aErrno, fildes, cache, SEEK_SET); |
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} |
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else |
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146 |
{ |
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anErrno = ENXIO; |
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retval = -1; |
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} |
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} |
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else |
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152 |
{ |
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anErrno = EMFILE; |
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retval = -1; |
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} |
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if(-1 == retval) |
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157 |
{ |
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/*Remove the newly created shared memory*/ |
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Backend()->iIpcS.shmctl(lshmid, IPC_RMID, NULL,aErrno); |
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} |
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} |
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else |
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163 |
{ |
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anErrno = EMFILE; |
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retval = -1; |
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} |
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|
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return retval; |
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} |
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|
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#ifdef __SYMBIAN_COMPILE_UNUSED__ |
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::MapLength |
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// Observer for length |
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// ----------------------------------------------------------------------------- |
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// |
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size_t CMmapMemoryNode::MapLength() |
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{ |
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return iMapMem.len; |
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} |
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181 |
|
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::MapFileOffset |
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// Observer for file offset |
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// ----------------------------------------------------------------------------- |
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// |
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off_t CMmapMemoryNode::MapFileOffset() |
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{ |
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return iMapMem.offset; |
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} |
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#endif |
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192 |
|
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::LinkOffset |
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// Determine message data member link offset for single queue |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CMmapMemoryNode::LinkOffset() |
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{ |
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return _FOFF(CMmapMemoryNode, iLink); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::MappedAddress |
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// return pointer to mapped memory. |
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// ----------------------------------------------------------------------------- |
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// |
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TAny* CMmapMemoryNode::MappedAddress() |
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{ |
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return iMapMem.addr; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::GetMemInfo |
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// return mapped memory info i.e struct MappedMemory. |
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// ----------------------------------------------------------------------------- |
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// |
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struct MappedMemory CMmapMemoryNode::GetMemInfo() |
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{ |
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return iMapMem; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::SetFdescAddress |
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// store fdescbase address. |
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// ----------------------------------------------------------------------------- |
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// |
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void CMmapMemoryNode::SetFdescAddress(void* aAddr) |
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{ |
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iMapMem.fdescaddr = aAddr; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CMmapMemoryNode::SyncMemory |
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// Sync the mapped memory into the underlying file. |
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// ----------------------------------------------------------------------------- |
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// |
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|
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int CMmapMemoryNode::SyncMemory(int len, int syncflag, int& anErrno) |
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{ |
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int retval = -1; |
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int flags; |
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off_t cache; |
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int aErrno = 0; |
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long anArg = 0L; |
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flags = _fcntl_r(&aErrno, iMapMem.fd, F_GETFL, anArg); |
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if(MS_INVALIDATE == syncflag) |
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{ |
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/* Make sure the file is open atleast in read-only mode */ |
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if(-1 != flags && (O_RDWR == (flags & O_ACCMODE) || O_RDONLY == (flags & O_ACCMODE))) |
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{ |
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/*cache the current location before we seek to a new position*/ |
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cache = _lseek_r(&aErrno, iMapMem.fd, 0, SEEK_CUR); |
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if(iMapMem.offset == _lseek_r(&aErrno,iMapMem.fd, iMapMem.offset, SEEK_SET)) |
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{ |
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int readlen = _read_r(&aErrno,iMapMem.fd, (char*)iMapMem.addr, len); |
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if(-1 == readlen) |
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{ |
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anErrno = aErrno; |
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} |
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else if(len >= readlen) |
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{ |
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retval = 0; |
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} |
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/*Now seek back to the original position*/ |
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_lseek_r(&aErrno, iMapMem.fd, cache, SEEK_SET); |
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} |
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else |
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{ |
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anErrno = ENOMEM; |
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} |
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|
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} |
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} |
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else if(-1 != flags && (O_RDWR == (flags & O_ACCMODE) || O_WRONLY == (flags & O_ACCMODE))) |
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{ |
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/*cache the current location before we seek to a new position*/ |
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cache = _lseek_r(&aErrno, iMapMem.fd, 0, SEEK_CUR); |
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if(iMapMem.offset == _lseek_r(&aErrno,iMapMem.fd, iMapMem.offset, SEEK_SET)) |
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{ |
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//sync/async capability, both are treated the same way |
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if((MS_ASYNC == syncflag) || (MS_SYNC == syncflag)) |
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{ |
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int writelen = _write_r(&aErrno,iMapMem.fd, (char*)iMapMem.addr, len); |
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if(-1 == writelen) |
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{ |
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anErrno = aErrno; |
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} |
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else if(len >= writelen) |
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{ |
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retval = 0; |
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} |
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} |
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else |
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{ |
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anErrno = EINVAL; |
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} |
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/*Now seek back to the original position*/ |
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_lseek_r(&aErrno, iMapMem.fd, cache, SEEK_SET); |
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} |
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else |
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{ |
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anErrno = ENOMEM; |
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} |
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} |
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else |
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{ |
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anErrno = ENOMEM; |
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} |
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|
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return retval; |
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} |
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|
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// End of File |