subsys/csrss/api/handle.c

   1 /* $Id$
   2  *
   3  * reactos/subsys/csrss/api/handle.c
   4  *
   5  * Console I/O functions
   6  *
   7  * ReactOS Operating System
   8  */
   9
  10 /* INCLUDES ******************************************************************/
  11
  12 #include <ddk/ntddk.h>
  13
  14 #include <csrss/csrss.h>
  15 #include "api.h"
  16 #include <ntdll/rtl.h>
  17
  18 /* FUNCTIONS *****************************************************************/
  19
  20 NTSTATUS STDCALL CsrGetObject( PCSRSS_PROCESS_DATA ProcessData, HANDLE Handle, Object_t **Object )
  21 {
  22    ULONG h = (((ULONG)Handle) >> 2) - 1;
  23   //   DbgPrint( "CsrGetObject, Object: %x, %x, %x\n", Object, Handle, ProcessData->HandleTableSize );
  24    if( h >= ProcessData->HandleTableSize )
  25      {
  26        DbgPrint( "CsrGetObject returning invalid handle\n" );
  27        return STATUS_INVALID_HANDLE;
  28      }
  29    *Object = ProcessData->HandleTable[h];
  30    //   DbgPrint( "CsrGetObject returning\n" );
  31    return *Object ? STATUS_SUCCESS : STATUS_INVALID_HANDLE;
  32 }
  33
  34
  35 NTSTATUS STDCALL CsrReleaseObject(PCSRSS_PROCESS_DATA ProcessData,
  36                           HANDLE Handle)
  37 {
  38    Object_t *Object;
  39    ULONG h = (((ULONG)Handle) >> 2) - 1;
  40    if( h >= ProcessData->HandleTableSize || ProcessData->HandleTable[h] == 0 )
  41       return STATUS_INVALID_HANDLE;
  42    /* dec ref count */
  43    Object = ProcessData->HandleTable[h];
  44    if( InterlockedDecrement( &Object->ReferenceCount ) == 0 )
  45       switch( Object->Type )
  46          {
  47          case CSRSS_CONSOLE_MAGIC: CsrDeleteConsole( (PCSRSS_CONSOLE) Object );
  48             break;
  49          case CSRSS_SCREEN_BUFFER_MAGIC: CsrDeleteScreenBuffer( (PCSRSS_SCREEN_BUFFER) Object );
  50             break;
  51          default: DbgPrint( "CSR: Error: releaseing unknown object type" );
  52          }
  53    ProcessData->HandleTable[h] = 0;
  54    return STATUS_SUCCESS;
  55 }
  56
  57 NTSTATUS STDCALL CsrInsertObject( PCSRSS_PROCESS_DATA ProcessData, PHANDLE Handle, Object_t *Object )
  58 {
  59    ULONG i;
  60    PVOID* NewBlock;
  61
  62    for (i = 0; i < ProcessData->HandleTableSize; i++)
  63      {
  64         if (ProcessData->HandleTable[i] == NULL)
  65           {
  66              ProcessData->HandleTable[i] = Object;
  67              *Handle = (HANDLE)(((i + 1) << 2) | 0x3);
  68              InterlockedIncrement( &Object->ReferenceCount );
  69              return(STATUS_SUCCESS);
  70           }
  71      }
  72    NewBlock = RtlAllocateHeap(CsrssApiHeap,
  73                               HEAP_ZERO_MEMORY,
  74                               (ProcessData->HandleTableSize + 64) *
  75                               sizeof(HANDLE));
  76    if (NewBlock == NULL)
  77      {
  78         return(STATUS_UNSUCCESSFUL);
  79      }
  80    RtlCopyMemory(NewBlock,
  81                  ProcessData->HandleTable,
  82                  ProcessData->HandleTableSize * sizeof(HANDLE));
  83    RtlFreeHeap( CsrssApiHeap, 0, ProcessData->HandleTable );
  84    ProcessData->HandleTable = (Object_t **)NewBlock;
  85    ProcessData->HandleTable[i] = Object;
  86    *Handle = (HANDLE)(((i + 1) << 2) | 0x3);
  87    InterlockedIncrement( &Object->ReferenceCount );
  88    ProcessData->HandleTableSize = ProcessData->HandleTableSize + 64;
  89    return(STATUS_SUCCESS);
  90 }
  91
  92
  93 /* EOF */