On 11/13/12, Corinna Vinschen <vinsc...@redhat.com> wrote:
> On Nov 13 16:32, Ozkan Sezer wrote:
>> On Mon, Nov 12, 2012 at 7:37 PM, Corinna Vinschen <vinsc...@redhat.com>
>> wrote:
>>
>> About the correction made in SYSTEM_BASIC_INFORMATION:
>>
>> [...]
>> > Index: winternl.h
>> > ===================================================================
>> > --- winternl.h (revision 5451)
>> > +++ winternl.h (working copy)
>> > @@ -688,9 +688,9 @@
>> > ULONG LowestPhysicalPage;
>> > ULONG HighestPhysicalPage;
>> > ULONG AllocationGranularity;
>> > - ULONG LowestUserAddress;
>> > - ULONG HighestUserAddress;
>> > - ULONG ActiveProcessors;
>> > + ULONG_PTR LowestUserAddress;
>> > + ULONG_PTR HighestUserAddress;
>> > + ULONG_PTR ActiveProcessors;
>> > CCHAR NumberOfProcessors;
>> > } SYSTEM_BASIC_INFORMATION,*PSYSTEM_BASIC_INFORMATION;
>>
>> If we compare original structure, we have:
>>
>> BYTE Reserved1[24];
>> PVOID Reserved2[4];
>> CCHAR NumberOfProcessors;
>>
>> So, PVOID Reserved2[4] should correspond to 4 ULONG_PTR members
>> in the detailed version: do we not need the following, too?
>>
>> - ULONG AllocationGranularity;
>> + ULONG_PTR AllocationGranularity;
>
> No, the AllocationGranularity is a ULONG value. The size of the
> structure is a result of the automatic 8 byte alignment of 8 byte types.
> Try this:
>
> === SNIP ===
> #include <stdio.h>
> #include <string.h>
> #include <windows.h>
>
> #ifndef NT_SUCCESS
> #define NT_SUCCESS(status) ((NTSTATUS) (status) >= 0)
> #endif
>
> typedef int NTSTATUS;
>
> typedef struct _SYSTEM_BASIC_INFORMATION
> {
> ULONG Unknown;
> ULONG MaximumIncrement;
> ULONG PhysicalPageSize;
> ULONG NumberOfPhysicalPages;
> ULONG LowestPhysicalPage;
> ULONG HighestPhysicalPage;
> ULONG AllocationGranularity;
> #ifdef _WIN64
> ULONG dummy1;
> #endif
> ULONG_PTR LowestUserAddress;
> ULONG_PTR HighestUserAddress;
> ULONG_PTR ActiveProcessors;
> UCHAR NumberProcessors;
> } SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;
>
> NTSTATUS NTAPI NtQuerySystemInformation (ULONG, PVOID, ULONG, PULONG);
>
> int
> main ()
> {
> NTSTATUS status;
> ULONG i, size;
> SYSTEM_BASIC_INFORMATION sbi;
>
> memset (&sbi, 0xbf, sizeof sbi);
> status = NtQuerySystemInformation (0, &sbi, sizeof sbi, &size);
> if (!NT_SUCCESS (status))
> {
> fprintf (stderr, "NtQuerySystemInformation: 0x%lx\n", status);
> return 1;
> }
> printf ("Size: %lu\n", size);
> printf ("AllocationGranularity: %lu\n", sbi.AllocationGranularity);
> #ifdef _WIN64
> printf ("dummy1: 0x%lx\n", sbi.dummy1);
> #endif
> return 0;
> }
> === SNAP ===
>
> $ x86_64-w64-mingw32-gcc -g -o sbi sbi.c -lntdll
> $ ./sbi
> Size: 64
> AllocationGranularity: 65536
> dummy1: 0xbfbfbfbf
>
I see. Thanks.
>
> Corinna
>
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