reactos/ntoskrnl/io/shutdown.c

   1 /* $Id: shutdown.c,v 1.6 2002/09/07 15:12:53 chorns Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/io/shutdown.c
   6  * PURPOSE:         Implements shutdown notification
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ntoskrnl.h>
  15
  16 #define NDEBUG
  17 #include <internal/debug.h>
  18
  19
  20 /* LOCAL DATA ***************************************************************/
  21
  22 typedef struct _SHUTDOWN_ENTRY
  23 {
  24    LIST_ENTRY ShutdownList;
  25    PDEVICE_OBJECT DeviceObject;
  26 } SHUTDOWN_ENTRY, *PSHUTDOWN_ENTRY;
  27
  28 static LIST_ENTRY ShutdownListHead;
  29 static KSPIN_LOCK ShutdownListLock;
  30
  31 #define TAG_SHUTDOWN_ENTRY    TAG('S', 'H', 'U', 'T')
  32
  33 /* FUNCTIONS *****************************************************************/
  34
  35 VOID IoInitShutdownNotification (VOID)
  36 {
  37    InitializeListHead(&ShutdownListHead);
  38    KeInitializeSpinLock(&ShutdownListLock);
  39 }
  40
  41 VOID IoShutdownRegisteredDevices(VOID)
  42 {
  43    PSHUTDOWN_ENTRY ShutdownEntry;
  44    PLIST_ENTRY Entry;
  45    IO_STATUS_BLOCK StatusBlock;
  46    PIRP Irp;
  47    KEVENT Event;
  48    NTSTATUS Status;
  49
  50    Entry = ShutdownListHead.Flink;
  51    while (Entry != &ShutdownListHead)
  52      {
  53         ShutdownEntry = CONTAINING_RECORD(Entry, SHUTDOWN_ENTRY, ShutdownList);
  54
  55         KeInitializeEvent (&Event,
  56                            NotificationEvent,
  57                            FALSE);
  58
  59         Irp = IoBuildSynchronousFsdRequest (IRP_MJ_SHUTDOWN,
  60                                             ShutdownEntry->DeviceObject,
  61                                             NULL,
  62                                             0,
  63                                             NULL,
  64                                             &Event,
  65                                             &StatusBlock);
  66
  67         Status = IoCallDriver (ShutdownEntry->DeviceObject,
  68                                Irp);
  69         if (Status == STATUS_PENDING)
  70         {
  71                 KeWaitForSingleObject (&Event,
  72                                        Executive,
  73                                        KernelMode,
  74                                        FALSE,
  75                                        NULL);
  76         }
  77
  78         Entry = Entry->Flink;
  79      }
  80 }
  81
  82 NTSTATUS STDCALL IoRegisterShutdownNotification(PDEVICE_OBJECT DeviceObject)
  83 {
  84    PSHUTDOWN_ENTRY Entry;
  85
  86    Entry = ExAllocatePoolWithTag(NonPagedPool, sizeof(SHUTDOWN_ENTRY),
  87                                  TAG_SHUTDOWN_ENTRY);
  88    if (Entry == NULL)
  89      return STATUS_INSUFFICIENT_RESOURCES;
  90
  91    Entry->DeviceObject = DeviceObject;
  92
  93    ExInterlockedInsertHeadList(&ShutdownListHead,
  94                                &Entry->ShutdownList,
  95                                &ShutdownListLock);
  96
  97    DeviceObject->Flags |= DO_SHUTDOWN_REGISTERED;
  98
  99    return STATUS_SUCCESS;
 100 }
 101
 102 VOID STDCALL IoUnregisterShutdownNotification(PDEVICE_OBJECT DeviceObject)
 103 {
 104    PSHUTDOWN_ENTRY ShutdownEntry;
 105    PLIST_ENTRY Entry;
 106    KIRQL oldlvl;
 107
 108    Entry = ShutdownListHead.Flink;
 109    while (Entry != &ShutdownListHead)
 110      {
 111         ShutdownEntry = CONTAINING_RECORD(Entry, SHUTDOWN_ENTRY, ShutdownList);
 112         if (ShutdownEntry->DeviceObject == DeviceObject)
 113           {
 114             DeviceObject->Flags &= ~DO_SHUTDOWN_REGISTERED;
 115
 116             KeAcquireSpinLock(&ShutdownListLock,&oldlvl);
 117             RemoveEntryList(Entry);
 118             KeReleaseSpinLock(&ShutdownListLock,oldlvl);
 119
 120             ExFreePool(Entry);
 121             return;
 122           }
 123
 124         Entry = Entry->Flink;
 125      }
 126 }
 127
 128 /* EOF */