LCOV - code coverage report
Current view: directory - objdir/dist/include/mozilla/ipc - SharedMemorySysV.h (source / functions) Found Hit Coverage
Test: app.info Lines: 45 0 0.0 %
Date: 2012-06-02 Functions: 10 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * vim: sw=2 ts=8 et :
       3                 :  */
       4                 : /* ***** BEGIN LICENSE BLOCK *****
       5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       6                 :  *
       7                 :  * The contents of this file are subject to the Mozilla Public License Version
       8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       9                 :  * the License. You may obtain a copy of the License at
      10                 :  * http://www.mozilla.org/MPL/
      11                 :  *
      12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      14                 :  * for the specific language governing rights and limitations under the
      15                 :  * License.
      16                 :  *
      17                 :  * The Original Code is Mozilla IPC.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  *   The Mozilla Foundation
      21                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      28                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #ifndef mozilla_ipc_SharedMemorySysV_h
      41                 : #define mozilla_ipc_SharedMemorySysV_h
      42                 : 
      43                 : #if defined(OS_LINUX) && !defined(ANDROID)
      44                 : 
      45                 : // SysV shared memory isn't available on Windows, but we define the
      46                 : // following macro so that #ifdefs are clearer (compared to #ifdef
      47                 : // OS_LINUX).
      48                 : #define MOZ_HAVE_SHAREDMEMORYSYSV
      49                 : 
      50                 : #include "SharedMemory.h"
      51                 : 
      52                 : #include "nsDebug.h"
      53                 : 
      54                 : #include <errno.h>
      55                 : #include <fcntl.h>
      56                 : #include <stdio.h>
      57                 : #include <string.h>
      58                 : #include <sys/ipc.h>
      59                 : #include <sys/shm.h>
      60                 : 
      61                 : //
      62                 : // This is a low-level wrapper around platform shared memory.  Don't
      63                 : // use it directly; use Shmem allocated through IPDL interfaces.
      64                 : //
      65                 : 
      66                 : namespace mozilla {
      67                 : namespace ipc {
      68                 : 
      69                 : 
      70                 : class SharedMemorySysV : public SharedMemory
      71                 : {
      72                 : public:
      73                 :   typedef int Handle;
      74                 : 
      75               0 :   SharedMemorySysV() :
      76                 :     mHandle(-1),
      77               0 :     mData(nsnull)
      78                 :   {
      79               0 :   }
      80                 : 
      81                 :   SharedMemorySysV(Handle aHandle) :
      82                 :     mHandle(aHandle),
      83                 :     mData(nsnull)
      84                 :   {
      85                 :   }
      86                 : 
      87               0 :   virtual ~SharedMemorySysV()
      88               0 :   {
      89               0 :     shmdt(mData);
      90               0 :     mHandle = -1;
      91               0 :     mData = nsnull;
      92               0 :   }
      93                 : 
      94                 :   NS_OVERRIDE
      95               0 :   virtual bool Create(size_t aNbytes)
      96                 :   {
      97               0 :     int id = shmget(IPC_PRIVATE, aNbytes, IPC_CREAT | 0600);
      98               0 :     if (id == -1)
      99               0 :       return false;
     100                 : 
     101               0 :     mHandle = id;
     102               0 :     mAllocSize = aNbytes;
     103               0 :     Created(aNbytes);
     104                 : 
     105               0 :     return Map(aNbytes);
     106                 :   }
     107                 : 
     108                 :   NS_OVERRIDE
     109               0 :   virtual bool Map(size_t nBytes)
     110                 :   {
     111                 :     // already mapped
     112               0 :     if (mData)
     113               0 :       return true;
     114                 : 
     115               0 :     if (!IsHandleValid(mHandle))
     116               0 :       return false;
     117                 : 
     118               0 :     void* mem = shmat(mHandle, nsnull, 0);
     119               0 :     if (mem == (void*) -1) {
     120                 :       char warning[256];
     121                 :       snprintf(warning, sizeof(warning)-1,
     122               0 :                "shmat(): %s (%d)\n", strerror(errno), errno);
     123                 : 
     124               0 :       NS_WARNING(warning);
     125                 : 
     126               0 :       return false;
     127                 :     }
     128                 : 
     129                 :     // Mark the handle as deleted so that, should this process go away, the
     130                 :     // segment is cleaned up.
     131               0 :     shmctl(mHandle, IPC_RMID, 0);
     132                 : 
     133               0 :     mData = mem;
     134                 : 
     135                 : #ifdef NS_DEBUG
     136                 :     struct shmid_ds info;
     137               0 :     if (shmctl(mHandle, IPC_STAT, &info) < 0)
     138               0 :       return false;
     139                 : 
     140               0 :     NS_ABORT_IF_FALSE(nBytes <= info.shm_segsz,
     141                 :                       "Segment doesn't have enough space!");
     142                 : #endif
     143                 : 
     144               0 :     Mapped(nBytes);
     145               0 :     return true;
     146                 :   }
     147                 : 
     148                 :   NS_OVERRIDE
     149               0 :   virtual void* memory() const
     150                 :   {
     151               0 :     return mData;
     152                 :   }
     153                 : 
     154                 :   NS_OVERRIDE
     155               0 :   virtual SharedMemoryType Type() const
     156                 :   {
     157               0 :     return TYPE_SYSV;
     158                 :   }
     159                 : 
     160               0 :   Handle GetHandle() const
     161                 :   {
     162               0 :     NS_ABORT_IF_FALSE(IsHandleValid(mHandle), "invalid handle");
     163               0 :     return mHandle;
     164                 :   }
     165                 : 
     166               0 :   static Handle NULLHandle()
     167                 :   {
     168               0 :     return -1;
     169                 :   }
     170                 : 
     171               0 :   static bool IsHandleValid(Handle aHandle)
     172                 :   {
     173               0 :     return aHandle != -1;
     174                 :   }
     175                 : 
     176                 : private:
     177                 :   Handle mHandle;
     178                 :   void* mData;
     179                 : };
     180                 : 
     181                 : } // namespace ipc
     182                 : } // namespace mozilla
     183                 : 
     184                 : #endif // OS_LINUX
     185                 : 
     186                 : #endif // ifndef mozilla_ipc_SharedMemorySysV_h

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