ZwMakeTemporaryObject function (wdm.h)

Article
04/18/2022
2 minutes to read

The ZwMakeTemporaryObject routine changes the attributes of an object to make it temporary.

Syntax

NTSYSAPI NTSTATUS ZwMakeTemporaryObject(
  [in] HANDLE Handle
);

Parameters

[in] Handle

Handle to an object of any type.

Return value

ZwMakeTemporaryObject returns STATUS_SUCCESS on success, or the appropriate NTSTATUS error code on failure.

Remarks

ZwMakeTemporaryObject is a generic routine that operates on any type of object.

An object is permanent if it was created with the OBJ_PERMANENT object attribute specified. (For more information about object attributes, see InitializeObjectAttributes.) A permanent object is created with a reference count of 1, so it is not deleted when a driver dereferences it.

An object is temporary if it is not permanent. ZwMakeTemporaryObject turns the specified object into a temporary object. If the object is already temporary, this routine does nothing.

A temporary object has a name only as long as its handle count is greater than zero. When the handle count reaches zero, the system deletes the object name and appropriately adjusts the object's pointer count.

Note If the call to this function occurs in user mode, you should use the name "NtMakeTemporaryObject" instead of "ZwMakeTemporaryObject".

For calls from kernel-mode drivers, the NtXxx and ZwXxx versions of a Windows Native System Services routine can behave differently in the way that they handle and interpret input parameters. For more information about the relationship between the NtXxx and ZwXxx versions of a routine, see Using Nt and Zw Versions of the Native System Services Routines.

Requirements


Minimum supported client	Available starting with Windows 2000.
Target Platform	Universal
Header	wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe
IRQL	PASSIVE_LEVEL
DDI compliance rules	HwStorPortProhibitedDDIs(storport), PowerIrpDDis(wdm)