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The IoIs32bitProcess routine checks whether the originator of the current I/O request is a 32-bit user-mode application.
Syntax
BOOLEAN IoIs32bitProcess(
[in, optional] PIRP Irp
);
Parameters
[in, optional] Irp
Optional pointer to the IRP containing the current I/O request. Note that this must be the original IRP that was issued by the I/O manager. If the caller is a fast I/O dispatch routine (and thus there is no IRP), the caller should set this parameter to NULL.
Return value
IoIs32bitProcess returns TRUE if the originator of the current I/O request is a 32-bit user-mode process. Otherwise, it returns FALSE.
Remarks
Drivers call IoIs32bitProcess to determine whether an I/O request is likely to contain data elements that need to be converted, or "thunked," before they can be used in a 64-bit driver.
If the Irp parameter is NULL, and the caller is running in the context of a user-mode process, IoIs32bitProcess returns TRUE if this process is a 32-bit process.
If the Irp parameter is not NULL, it must point to an IRP that was issued by the I/O manager on behalf of a user-mode process. IoIs32bitProcess cannot be used to check driver-allocated IRPs. Driver-allocated IRPs, as well as kernel-mode drivers, are assumed to be 64-bit-ready.
For more information, see Programming Issues for 64-Bit Drivers.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in 64-bit versions of Microsoft Windows XP and later 64-bit versions of the Windows operating system. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= DISPATCH_LEVEL |