apc.c

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#include <stdio.h>
#include <string.h>
#define WIN32_NO_STATUS
#include <windows.h>
#define NTOS_MODE_USER
#include <ndk/ntndk.h>
 
HANDLE OutputHandle;
HANDLE InputHandle;
 
VOID WINAPI
ApcRoutine(PVOID Context,
       PIO_STATUS_BLOCK IoStatus,
       ULONG Reserved)
{
   printf("(apc.exe) ApcRoutine(Context %p)\n", Context);
}
 
 
int main(int argc, char* argv[])
{
   NTSTATUS Status;
   HANDLE FileHandle;
   OBJECT_ATTRIBUTES ObjectAttributes;
   UNICODE_STRING FileName = RTL_CONSTANT_STRING(L"\\C:\\a.txt");
   IO_STATUS_BLOCK IoStatus;
   CHAR Buffer[256];
   HANDLE EventHandle;
   LARGE_INTEGER off;
 
   AllocConsole();
   InputHandle = GetStdHandle(STD_INPUT_HANDLE);
   OutputHandle =  GetStdHandle(STD_OUTPUT_HANDLE);
 
   printf("APC test program\n");
 
   EventHandle = CreateEventW(NULL,
                  FALSE,
                  FALSE,
                  NULL);
   if (EventHandle == INVALID_HANDLE_VALUE)
     {
    printf("Failed to create event\n");
    return 0;
     }
 
   printf("Opening file\n");
   InitializeObjectAttributes(&ObjectAttributes,
                  &FileName,
                  0,
                  NULL,
                  NULL);
 
   printf("Creating file\n");
   FileHandle = CreateFileW(L"C:\\a.txt",
                FILE_GENERIC_READ | FILE_GENERIC_WRITE,
                0,
                NULL,
                OPEN_EXISTING,
                FILE_FLAG_OVERLAPPED,
                NULL);
 
   if (FileHandle == INVALID_HANDLE_VALUE)
     {
 
  printf("Open failed last err 0x%lx\n",GetLastError());
    return 0;
     }
 
     off.QuadPart = 0;
 
   printf("Reading file\n");
   Status = ZwReadFile(FileHandle,
            NULL,
            (PIO_APC_ROUTINE)ApcRoutine,
            (PVOID) 0xdeadbeef,
            &IoStatus,
            Buffer,
            256,//len
            &off ,//offset must exist if file was opened for asynch. i/o aka. OVERLAPPED
            NULL);
 
   if (!NT_SUCCESS(Status))
     {
    printf("Read failed status 0x%lx\n",Status);
     }
   printf("Waiting\n");
   WaitForSingleObjectEx(EventHandle, INFINITE, TRUE);
   printf("Returned from wait\n");
   ZwClose(FileHandle);
   printf("Program finished\n");
   return 0;
}