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-- |
0
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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 mmap/munmap/msync. |
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* |
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*/ |
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|
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|
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// INCLUDE FILES |
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|
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#include <e32hal.h> |
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#include <sys/errno.h> |
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#include <sys/mman.h> |
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#include <sys/ipc.h> |
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#include <fcntl.h> |
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#include "mmapcontrollernode.h" |
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#include "sysreent.h" |
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#include "lposix.h" |
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#include "mmap.h" |
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|
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__BEGIN_DECLS |
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static int ComputeMemFlag(int prot); |
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|
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// ----------------------------------------------------------------------------- |
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// Funcation name: _mmap_r |
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// Description: Provides mmap functionality. |
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// Returns: valid address : On success |
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// -1 : On error |
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// In case of error, errno value set |
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// ----------------------------------------------------------------------------- |
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|
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EXPORT_C TAny* _mmap_r(struct _reent *r, size_t len, int prot, int flags, int fildes, off_t offset) |
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{ |
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TInt pageSize = -1; |
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UserHal::PageSizeInBytes(pageSize); |
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size_t lpagesize = pageSize;/*getpagesize();*/ |
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int lshmflg; |
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void* lmapaddr=NULL; |
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int lfileflg; |
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size_t maplen; |
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|
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if((0 == len) || (!(flags & MAP_PRIVATE) && !(flags & MAP_SHARED))) |
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{ |
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r->_errno = EINVAL; |
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return MAP_FAILED; |
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} |
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else |
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{ |
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/*Align len to page boundry*/ |
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size_t ltemp; |
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maplen = len; |
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ltemp = (len / lpagesize); |
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if(len % lpagesize) |
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{ |
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len = (ltemp * lpagesize) + lpagesize; |
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} |
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} |
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/* validate fd */ |
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long anArg = 0L; |
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int aErrno = 0; |
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lfileflg = _fcntl_r(&aErrno, fildes, F_GETFL, anArg); |
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if((-1 == lfileflg) || (-1 == fildes)) |
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{ |
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r->_errno = EBADF; |
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return MAP_FAILED; |
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} |
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/* offset should be page aligned */ |
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if(offset % lpagesize) |
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{ |
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r->_errno = EINVAL; |
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return MAP_FAILED; |
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} |
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/* MAP_FIXED is not supported*/ |
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if(!(MAP_FIXED & flags)) |
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{ |
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if(((O_RDONLY == lfileflg) && (PROT_WRITE & prot) && (MAP_SHARED & flags)) \ |
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|| (O_WRONLY == lfileflg)) |
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{ |
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r->_errno = EACCES; |
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return MAP_FAILED; |
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} |
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lshmflg = ComputeMemFlag(prot); |
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if(lshmflg) |
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{ |
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/* check for any leave */ |
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TRAPD(err, lmapaddr = CMmapControllerNode::AddMmapNodeL(r, len, flags, lshmflg, fildes, offset, maplen)); |
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if(err != KErrNone) |
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{ |
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MapError(err, r->_errno); |
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return MAP_FAILED; |
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} |
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if(((void *)-1) == lmapaddr) |
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{ |
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return MAP_FAILED; |
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} |
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107 |
else |
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108 |
{ |
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return lmapaddr; |
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} |
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} |
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else |
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113 |
{ |
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r->_errno = ENOTSUP; |
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return MAP_FAILED; |
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} |
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} |
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118 |
else |
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119 |
{ |
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r->_errno = ENOTSUP; |
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return MAP_FAILED; |
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} |
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123 |
|
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} |
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125 |
|
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126 |
|
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// ----------------------------------------------------------------------------- |
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// Funcation name: _munmap_r |
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// Description: Provides munmap functionality. |
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// Returns: 0 : On success |
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// -1 : On error |
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// In case of error, errno value set |
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// Remark: support for unmapping part of the mapped pages is not supported |
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// Unmap will remove all mappings those were mapped starting from the offset |
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// to offset + len (refer to mmap signature) |
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// ----------------------------------------------------------------------------- |
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137 |
|
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138 |
EXPORT_C int _munmap_r(struct _reent *r, void *addr, size_t len) |
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{ |
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int retval = -1; |
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if(0 != len) |
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142 |
{ |
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CMmapControllerNode* lmemcontrol = (CMmapControllerNode*)r->_memaddr; |
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if(lmemcontrol) |
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145 |
{ |
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retval = lmemcontrol->DeleteMmapNode(addr, r->_errno); |
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} |
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} |
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149 |
else |
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150 |
{ |
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r->_errno = EINVAL; |
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retval = -1; |
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} |
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return retval; |
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} |
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156 |
|
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157 |
|
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158 |
|
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// ----------------------------------------------------------------------------- |
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// Funcation name: _msync_r |
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// Description: Provides msync functionality. |
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// Returns: 0 : On success |
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// -1 : On error |
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// In case of error, errno value set |
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// ----------------------------------------------------------------------------- |
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166 |
|
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167 |
EXPORT_C int _msync_r(struct _reent *r, void *addr, size_t len, int flags) |
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168 |
{ |
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int retval = -1; |
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CMmapControllerNode* lmemcontrol = (CMmapControllerNode*)r->_memaddr; |
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171 |
|
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if(lmemcontrol) |
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173 |
{ |
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retval = lmemcontrol->SyncMmapNode(addr, len, flags, r->_errno); |
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} |
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else |
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177 |
{ |
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r->_errno = ENOMEM; |
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retval = -1; |
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} |
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return retval; |
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182 |
|
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183 |
} |
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184 |
|
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185 |
|
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// ----------------------------------------------------------------------------- |
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// Funcation name: _mprotect_r |
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// Description: Provides msync functionality. |
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// Returns: 0 : On success |
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// -1 : On error |
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// In case of error, errno value set |
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// Remark: mprotect is only build enabled and not functional |
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// ----------------------------------------------------------------------------- |
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194 |
|
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195 |
EXPORT_C int _mprotect_r(struct _reent *r, const void *addr, size_t len, int prot) |
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{ |
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int retval = -1; |
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CMmapControllerNode* lmemcontrol = (CMmapControllerNode*)r->_memaddr; |
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199 |
|
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if(lmemcontrol) |
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{ |
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retval = lmemcontrol->ChprotMmapNode(addr, len, prot, r->_errno); |
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} |
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else |
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205 |
{ |
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r->_errno = EINVAL; |
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retval = -1; |
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} |
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return retval; |
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} |
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211 |
|
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212 |
|
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/*------------------------------------------------------------------------------ |
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* LOCAL FUNCTIONS |
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*------------------------------------------------------------------------------ |
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*/ |
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|
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static int ComputeMemFlag(int prot) |
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{ |
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int lshmflg = 0; |
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switch(prot) |
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{ |
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/* A read/write/exec here would mean read/write/exec for owner alone, |
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* as "group and others" concept are not supported by the platform |
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* exec-only will not supported since memory execution is not |
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* supported by the platform. Everything else is translated to read/write |
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* since shared memory (used internally by mmap) supports only read/write |
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* mode. |
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*/ |
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case PROT_READ: |
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case PROT_WRITE: |
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case PROT_WRITE | PROT_READ: |
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case PROT_READ | PROT_EXEC: |
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case PROT_WRITE | PROT_EXEC: |
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case PROT_WRITE | PROT_READ | PROT_EXEC: |
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lshmflg = lshmflg | S_IRWXU | IPC_CREAT | IPC_EXCL; |
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break; |
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case PROT_NONE: |
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case PROT_EXEC: |
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default: |
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break; |
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} |
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return lshmflg; |
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} |
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|
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|
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__END_DECLS |
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// End of File |
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