subsystems/win/basesrv/sndsntry.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS Base API Server DLL
   4  * FILE:            subsystems/win/basesrv/sndsntry.c
   5  * PURPOSE:         Sound Sentry Notifications
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include "basesrv.h"
  12
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* GLOBALS ********************************************************************/
  17
  18 typedef BOOL (NTAPI *PUSER_SOUND_SENTRY)(VOID);
  19 BOOL NTAPI FirstSoundSentry(VOID);
  20
  21 static PUSER_SOUND_SENTRY _UserSoundSentry = FirstSoundSentry;
  22
  23 /* PRIVATE FUNCTIONS **********************************************************/
  24
  25 BOOL
  26 NTAPI
  27 FailSoundSentry(VOID)
  28 {
  29     /* In case the function can't be found/is unimplemented */
  30     return FALSE;
  31 }
  32
  33 BOOL
  34 NTAPI
  35 FirstSoundSentry(VOID)
  36 {
  37     UNICODE_STRING DllString = RTL_CONSTANT_STRING(L"winsrv");
  38     STRING FuncString = RTL_CONSTANT_STRING("_UserSoundSentry");
  39     HANDLE DllHandle;
  40     NTSTATUS Status;
  41     PUSER_SOUND_SENTRY NewSoundSentry = FailSoundSentry;
  42
  43     /* Load winsrv manually */
  44     Status = LdrGetDllHandle(NULL, NULL, &DllString, &DllHandle);
  45     if (NT_SUCCESS(Status))
  46     {
  47         /* If it was found, get SoundSentry export */
  48         Status = LdrGetProcedureAddress(DllHandle,
  49                                         &FuncString,
  50                                         0,
  51                                         (PVOID*)&NewSoundSentry);
  52     }
  53
  54     /* Set it as the callback for the future, and call it */
  55     _UserSoundSentry = NewSoundSentry;
  56     return _UserSoundSentry();
  57 }
  58
  59 /* PUBLIC SERVER APIS *********************************************************/
  60
  61 CSR_API(BaseSrvSoundSentryNotification)
  62 {
  63     /* Call the API and see if it succeeds */
  64     return (_UserSoundSentry() ? STATUS_SUCCESS : STATUS_ACCESS_DENIED);
  65 }
  66
  67 /* EOF */