Persistently write to a file from windows kernel driver - windows

Question

Hi I'm new to kernel level programming and trying to build a simple log writing driver. What I'm trying to achieve is to have a persistent driver will write referred text every predefined interval to a file in system path. (I'm not familiar IRQ hooking yet)
I have following globals for timing
// Timer
PKTIMER pTimer = NULL; // Pointer to the timer
PKDPC pDpcObject = NULL; // Pointer to the DPC
#define IDLE_INTERVAL (10000)
I call following code in the DriverEntry (However, problem with following code is its writing feature fails when computer restarted) Could someone suggest a fix ? Should it be called by IRQ Major call ?
while(1)
{
if (pTimer == NULL) // if timer object does not exist:
{
// Allocate memory for the object timer
pTimer = (PKTIMER) ExAllocatePool (NonPagedPool, sizeof (KTIMER));
KeInitializeTimer (pTimer); // Initialize the timer object
// Allocate memory for the DPC object and initialize it
pDpcObject = (PKDPC) ExAllocatePool (NonPagedPool, sizeof (KDPC));
KeInitializeDpc (pDpcObject, MyDeferredRoutine, pTimer);
}
LARGE_INTEGER dueTime;
dueTime.QuadPart = -10000 * IDLE_INTERVAL; // 10000 * 10000 * 1 ns
// "Platoon" timer:
KeSetTimerEx (pTimer,
dueTime, // latency relative interval
(IDLE_INTERVAL / 2), // period of 5 seconds, i.e. 5000 * 1 ms
pDpcObject);
if (KeReadStateTimer (pTimer))
{
//DbgPrint ("- Example- KeReadStateTimer returns TRUE.");
}
else
{
// DbgPrint ("- Example- KeReadStateTimer returns FALSE.");
}
}
Status = KeWaitForSingleObject (pTimer,
Executive, // IN KWAIT_REASON WaitReason,
KernelMode, // IN KPROCESSOR_MODE WaitMode,
FALSE, // IN BOOLEAN Alertable,
NULL); // IN PLARGE_INTEGER Timeout OPTIONAL
RtlInitUnicodeString(&TestName, L"\\??\\C:\\log.txt");
InitializeObjectAttributes(&ObjAttr, &TestName,
OBJ_CASE_INSENSITIVE,
0, NULL);
Status = NtCreateFile(&TestFile,
FILE_WRITE_DATA + SYNCHRONIZE,
&ObjAttr,
&IoStatus, NULL,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_WRITE,
FILE_OVERWRITE_IF,
FILE_SYNCHRONOUS_IO_NONALERT,
NULL, 0);
if(Status == STATUS_SUCCESS)
{
Status = NtWriteFile(TestFile,
0, NULL, NULL,
&IoStatus,
(PCHAR)"OUR LOG STORED TO LOG FILE",
22,
NULL, NULL);
}
NtClose(TestFile);
}