From: SMTP%"rick@rdperf.com" 16-OCT-1997 16:58:27.46
To: NTDEV
CC: RICK
Subj: Problem with DeviceIoControl on NT
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From: rick@rdperf.com
Date: Wed, 15 Oct 1997 16:30:23 -0700
Message-Id: <97101516302344@rdperf.com>
To: ntdev@atria.com
Subject: Problem with DeviceIoControl on NT
X-VMS-To: NTDEV
X-VMS-Cc: RICK
Sender: owner-ntdev@atria.com
Precedence: bulk
I have spent quite a lot of time trying to get the program at the end
on this message to work on NT. If someone knows what I have to do
differently, I would appreciate the help.
I besides doing a CreateFile to devices of type "\\.\C:", I have also
tried it with devices like "\\.\PHYSICALDRIVE0".
I always get an #1 (ERROR_INVALID_FUNCTION) from GetLastError()
after the call to DeviceIoControl.
I do the following commands to build/execute it:
cl -c test.c
link test
test c
Basically I want to get disk I/O rates so that I can control the amount
of work that a process does using a disk in order to not monopolize
disk access.
Rick Cadruvi
R&D Performance Group, Inc.
1180 E Patricia #102
Simi Valley, CA 93065
(805)520-4170 (office)
(805)520-4169 (fax)
rick@rdperf.com
------------------------------------------------------------
#include <windows.h>
#include <stdio.h>
#include <winioctl.h>
long main (long arg_cnt, char *arg_str[])
{
DISK_PERFORMANCE
disk_perf;
HANDLE
volume_handle;
unsigned long
out_size,
status;
char
open_devname[32];
memset (&disk_perf, 0, sizeof (disk_perf));
out_size = 0;
strcpy (open_devname, "\\\\.\\");
strcat (open_devname, arg_str[1]);
if (open_devname[strlen (open_devname) - 1] != ':')
strcat (open_devname, ":");
printf ("%s\n", open_devname);
volume_handle = CreateFile (open_devname, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
0, OPEN_EXISTING, 0, 0 );
if (volume_handle == INVALID_HANDLE_VALUE)
{
printf ("Error in CreateFile = %X\n", GetLastError());
return 0;
}
status = DeviceIoControl (volume_handle, IOCTL_DISK_PERFORMANCE, NULL, 0,
&disk_perf, sizeof (DISK_PERFORMANCE),
&out_size, 0);
if (status == 0)
{
printf ("Error in DeviceIOControl = %X (%d)\n",
GetLastError(), out_size);
return 0;
}
printf ("\n");
printf ("Bytes Read : %10d\n", disk_perf.BytesRead);
printf ("Bytes Written: %10d\n", disk_perf.BytesWritten);
printf ("Read Time : %10d\n", disk_perf.ReadTime);
printf ("Write Time : %10d\n", disk_perf.WriteTime);
printf ("Read Count : %10d\n", disk_perf.ReadCount);
printf ("Write Count : %10d\n", disk_perf.WriteCount);
printf ("Queue Depth : %10d\n", disk_perf.QueueDepth);
return (status);
}
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