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From:	"Rick Rankin" <rrankin AT primenet DOT com>
To:	"Serguei DACHIAN" <Serguei DOT Dachian AT univ-lemans DOT fr>,
	<cygwin AT sourceware DOT cygnus DOT com>
Subject:	RE: Again about physical disks.
Date:	Tue, 23 Mar 1999 20:43:44 -0700
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Here's a short code sample for accessing the physical media id on Win9x from
cygwin. The same mechanisms can be used to perform physical I/O. Much of
this was taken from the documentation that comes with VC++ 6. It compiles
and works fine with gcc.

Rick
--
Rick Rankin
rrankin AT primenet DOT com

#include <stdio.h>
#include <ctype.h>
#include <memory.h>
#include <windows.h>

#define VWIN32_DIOC_DOS_IOCTL 1

typedef struct _DEVIOCTL_REGISTERS
{
    DWORD reg_EBX;
    DWORD reg_EDX;
    DWORD reg_ECX;
    DWORD reg_EAX;
    DWORD reg_EDI;
    DWORD reg_ESI;
    DWORD reg_Flags;
} DEVIOCTL_REGISTERS, *PDEVIOCTL_REGISTERS;

typedef struct _MID
{
    WORD  midInfoLevel;
    DWORD midSerialNum;
    BYTE  midVolLabel[11];
    BYTE  midFileSysType[8];
} __attribute__ ((packed)) MID, *PMID;

BOOL DoIOCTL(PDEVIOCTL_REGISTERS preg)
{
    HANDLE hDevice;

    BOOL fResult;
    DWORD cb;

    preg->reg_Flags = 0x8000; // assume error (carry flag set)

    hDevice = CreateFile("\\\\.\\vwin32",
        GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
        (LPSECURITY_ATTRIBUTES) NULL, OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL, (HANDLE) NULL);

    if (hDevice == (HANDLE) INVALID_HANDLE_VALUE)
        return FALSE;
    else
    {
        fResult = DeviceIoControl(hDevice, VWIN32_DIOC_DOS_IOCTL,
            preg, sizeof(*preg), preg, sizeof(*preg), &cb, 0);

        if (!fResult)
            return FALSE;
    }

    CloseHandle(hDevice);

    return TRUE;
}

BOOL GetMediaID(PMID pmid, UINT nDrive)
{
    DEVIOCTL_REGISTERS reg;

    reg.reg_EAX = 0x440D;       // IOCTL for block devices
    reg.reg_EBX = nDrive;       // one-based drive ID
    reg.reg_ECX = 0x0866;       // Get Media ID command
    reg.reg_EDX = (DWORD) pmid; // receives media ID info

    if (!DoIOCTL(&reg))
        return FALSE;

    if (reg.reg_Flags & 0x8000) // error if carry flag set
        return FALSE;

    return TRUE;
}

int main(int argc, char *argv[])
{
	MID mediaId;
	UINT driveId = (UINT) (toupper(argv[1][0]) - '@');

	memset((void *) &mediaId, 0, sizeof(MID));
	if (GetMediaID(&mediaId, driveId)) {
		printf("infoLevel   = %d\n",   mediaId.midInfoLevel);
		printf("serialNum   = %x\n",   mediaId.midSerialNum);
		printf("volLabel    = '%s'\n", mediaId.midVolLabel);
		printf("fileSysType = '%s'\n", mediaId.midFileSysType);
	}

	return 0;
}



> -----Original Message-----
> From: cygwin-owner AT sourceware DOT cygnus DOT com
> [mailto:cygwin-owner AT sourceware DOT cygnus DOT com]On Behalf Of Serguei DACHIAN
> Sent: Tuesday, March 23, 1999 4:24 AM
> To: cygwin AT sourceware DOT cygnus DOT com
> Subject: Again about physical disks.
>
>
> > > I got and installed the DLL, include files (which were with
> DLL) and also
> > > your version of mount utility.  I can't still read my floppy (without
> > > speaking about hard drives).  Here is my bash session:
> > > [...]
> > > P.S.  Your readme say that some feateres are for NT only.
> Does it mean
> > > that i will not be able to read /dev/fd0 and/or /dev/hda ???
> >
> > Sorry, I haven't noticed, you're on a Win9X system. The used
> > methods to access partitions and hard drives are only
> > useful on NT. Thanks to M$ :-(
> >
> So what finally these all means: is there no ANY way to read a physical
> sector from a physical disk under CygWin on a Win9x system ???
>
> I've also tried to use native Windows API call DeviceIOControl, but
> CreateFile (one needs to open disk with this one at first) fails. The
> following code:
> -------------------------------------------------
> HANDLE myDiskHandle;
>    if ( (myDiskHandle = CreateFile (disk,
>                                     GENERIC_READ,
>                                     FILE_SHARE_WRITE,
>                                     NULL,
>                                     OPEN_EXISTING,
>                                     FILE_ATTRIBUTE_NORMAL,
>                                     NULL)
>        ) == INVALID_HANDLE_VALUE )
>   {
>     printf("Error opening disque !!!\n");
>   }
> ------------------------------------------------
> fails (that is prints "Error opening disque !!!") with any of:
> char disk[]="\\\\.\\PHYSICALDRIVE2" ;
> char disk[]="\\\\.\\A:" ;
> char disk[]="\\\\.\\C:" ;
>
> I think this is again Win9x problem, because SDK documentation is
> not clear
> about it.
>
> So finally I state once more my question.  Is there ANY (at least one)
> method to read a physical disk from a physical drive using CygWin
> on a Win9x
> system???
>
> Any help whould be greatly appreciated.
>
> Regards,
>                 Serguei.
> __________________________________________________________________
> _________
> Serguei DACHIAN
> Laboratoire de Statistique et Processus,
> Universite du Maine, Av. Olivier Messiaen
> 72085 Le Mans CEDEX 9, FRANCE
> Tel.   : +33 (0)2 43 83 37 18
> Fax.   : +33 (0)2 43 83 35 79
> E-mail : Serguei DOT Dachian AT univ-lemans DOT fr
> WWW    :
> http://www.univ-lemans.fr/sciences/statist/cvs/thesard.html#dachian
>
>
> --
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> Send a message to cygwin-unsubscribe AT sourceware DOT cygnus DOT com
>


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