reactos/subsys/csrss/api/handle.c

   1 /* $Id: handle.c,v 1.8 2001/01/21 00:11:54 phreak Exp $
   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 CsrGetObject( PCSRSS_PROCESS_DATA ProcessData, HANDLE Handle, Object_t **Object )
  21 {
  22   //   DbgPrint( "CsrGetObject, Object: %x, %x, %x\n", Object, Handle, ProcessData->HandleTableSize );
  23    if( (((ULONG)Handle) >> 2) - 1 > ProcessData->HandleTableSize )
  24      {
  25        DbgPrint( "CsrGetObject returning invalid handle\n" );
  26        return STATUS_INVALID_HANDLE;
  27      }
  28    *Object = ProcessData->HandleTable[(((ULONG)Handle) >> 2) - 1];
  29    //   DbgPrint( "CsrGetObject returning\n" );
  30    return *Object ? STATUS_SUCCESS : STATUS_INVALID_HANDLE;
  31 }
  32
  33
  34 NTSTATUS CsrReleaseObject(PCSRSS_PROCESS_DATA ProcessData,
  35                           HANDLE Handle)
  36 {
  37    Object_t *Object;
  38    if( (((ULONG)Handle) >> 2) - 1 > ProcessData->HandleTableSize || ProcessData->HandleTable[(((ULONG)Handle) >> 2) - 1] == 0 )
  39       return STATUS_INVALID_HANDLE;
  40    /* dec ref count */
  41    Object = ProcessData->HandleTable[(((ULONG)Handle) >> 2) - 1];
  42    if( InterlockedDecrement( &Object->ReferenceCount ) == 0 )
  43       switch( Object->Type )
  44          {
  45          case CSRSS_CONSOLE_MAGIC: CsrDeleteConsole( (PCSRSS_CONSOLE) Object );
  46             break;
  47          case CSRSS_SCREEN_BUFFER_MAGIC: CsrDeleteScreenBuffer( (PCSRSS_SCREEN_BUFFER) Object );
  48             break;
  49          default: DbgPrint( "CSR: Error: releaseing unknown object type" );
  50          }
  51    ProcessData->HandleTable[(((ULONG)Handle) >> 2) - 1] = 0;
  52    return STATUS_SUCCESS;
  53 }
  54
  55 NTSTATUS CsrInsertObject( PCSRSS_PROCESS_DATA ProcessData, PHANDLE Handle, Object_t *Object )
  56 {
  57    ULONG i;
  58    PVOID* NewBlock;
  59
  60    for (i = 0; i < ProcessData->HandleTableSize; i++)
  61      {
  62         if (ProcessData->HandleTable[i] == NULL)
  63           {
  64              ProcessData->HandleTable[i] = Object;
  65              *Handle = (HANDLE)(((i + 1) << 2) | 0x3);
  66              InterlockedIncrement( &Object->ReferenceCount );
  67              return(STATUS_SUCCESS);
  68           }
  69      }
  70    NewBlock = RtlAllocateHeap(CsrssApiHeap,
  71                               HEAP_ZERO_MEMORY,
  72                               (ProcessData->HandleTableSize + 64) *
  73                               sizeof(HANDLE));
  74    if (NewBlock == NULL)
  75      {
  76         return(STATUS_UNSUCCESSFUL);
  77      }
  78    RtlCopyMemory(NewBlock,
  79                  ProcessData->HandleTable,
  80                  ProcessData->HandleTableSize * sizeof(HANDLE));
  81    RtlFreeHeap( CsrssApiHeap, 0, ProcessData->HandleTable );
  82    ProcessData->HandleTable = (Object_t **)NewBlock;
  83    ProcessData->HandleTable[i] = Object;
  84    *Handle = (HANDLE)(((i + 1) << 2) | 0x3);
  85    InterlockedIncrement( &Object->ReferenceCount );
  86    ProcessData->HandleTableSize = ProcessData->HandleTableSize + 64;
  87    return(STATUS_SUCCESS);
  88 }
  89
  90
  91