dll/win32/kernel32/client/resntfy.c

   1 /*
   2  * COPYRIGHT:            See COPYING in the top level directory
   3  * PROJECT:              ReactOS Win32 Base API
   4  * FILE:                 dll/win32/kernel32/client/resnotify.c
   5  * PURPOSE:              Memory Resource Notifications
   6  * PROGRAMMER:           Thomas Weidenmueller <w3seek@reactos.com>
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <k32.h>
  12
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* FUNCTIONS ******************************************************************/
  17
  18 /*
  19  * @implemented
  20  */
  21 HANDLE
  22 WINAPI
  23 CreateMemoryResourceNotification(IN MEMORY_RESOURCE_NOTIFICATION_TYPE NotificationType)
  24 {
  25     UNICODE_STRING EventName;
  26     OBJECT_ATTRIBUTES ObjectAttributes;
  27     HANDLE hEvent;
  28     NTSTATUS Status;
  29
  30     if (NotificationType > HighMemoryResourceNotification)
  31     {
  32         SetLastError(ERROR_INVALID_PARAMETER);
  33         return NULL;
  34     }
  35
  36     RtlInitUnicodeString(&EventName,
  37                          NotificationType ?
  38                          L"\\KernelObjects\\HighMemoryCondition" :
  39                          L"\\KernelObjects\\LowMemoryCondition");
  40
  41     InitializeObjectAttributes(&ObjectAttributes,
  42                                &EventName,
  43                                0,
  44                                NULL,
  45                                NULL);
  46
  47     Status = NtOpenEvent(&hEvent,
  48                          EVENT_QUERY_STATE | SYNCHRONIZE,
  49                          &ObjectAttributes);
  50     if (!NT_SUCCESS(Status))
  51     {
  52         BaseSetLastNTError(Status);
  53         return NULL;
  54     }
  55
  56     return hEvent;
  57 }
  58
  59 /*
  60  * @implemented
  61  */
  62 BOOL
  63 WINAPI
  64 QueryMemoryResourceNotification(IN HANDLE ResourceNotificationHandle,
  65                                 OUT PBOOL ResourceState)
  66 {
  67     EVENT_BASIC_INFORMATION EventInfo;
  68     NTSTATUS Status;
  69
  70     if ((ResourceNotificationHandle) &&
  71         (ResourceNotificationHandle != INVALID_HANDLE_VALUE) &&
  72         (ResourceState))
  73     {
  74         Status = NtQueryEvent(ResourceNotificationHandle,
  75                               EventBasicInformation,
  76                               &EventInfo,
  77                               sizeof(EventInfo),
  78                               NULL);
  79         if (NT_SUCCESS(Status))
  80         {
  81             *ResourceState = (EventInfo.EventState == 1);
  82             return TRUE;
  83         }
  84
  85         BaseSetLastNTError(Status);
  86     }
  87     else
  88     {
  89         SetLastError(ERROR_INVALID_PARAMETER);
  90     }
  91
  92     return FALSE;
  93 }
  94
  95 /* EOF */