卸载相应的共享内存区域

/******************************************************************************
* 函 数 名：DumpShareMemory
* 函数功能：卸载相应的共享内存
* 输入: iShmKey----共享内存KEY值，唯一标识
        *pAddress--数据的地址
* 返 回 值：0:成功，其他失败
*******************************************************************************/
int DumpShareMemory( key_t iShmKey, void  *pAddress )
{
           int iShmId;

            //获得共享内存区域
           iShmId = shmget(iShmKey,0,0666);
           if  (iShmId < 0)
          {
                      printf("Can't find sharememory!\n");
                      return -1;
            }
 
            int iRet = shmctl( iShmId,IPC_RMID,pAddress );
            if  ( iRet == -1 )
           {
                  printf("Delete memory failed!\n");
                 return -2;
            }

            return  0;
}