ZwOpenSection function (wdm.h)

The ZwOpenSection routine opens a handle for an existing section object.


  [out] PHANDLE            SectionHandle,
  [in]  ACCESS_MASK        DesiredAccess,
  [in]  POBJECT_ATTRIBUTES ObjectAttributes


[out] SectionHandle

Pointer to a HANDLE variable that receives a handle to the section object.

[in] DesiredAccess

Specifies an ACCESS_MASK value that determines the requested access to the object. For more information, see the DesiredAccess parameter of ZwCreateSection.

[in] ObjectAttributes

Pointer to an OBJECT_ATTRIBUTES structure that specifies the object name and other attributes. Use InitializeObjectAttributes to initialize this structure. If the caller is not running in a system thread context, it must set the OBJ_KERNEL_HANDLE attribute when it calls InitializeObjectAttributes.

Return value

ZwOpenSection returns STATUS_SUCCESS on success, or the appropriate error code on failure. Possible return values include:


If the section does not exist or the system did not grant the requested access, the operation fails.

Once the handle pointed to by SectionHandle is no longer in use, the driver must call ZwClose to close it.

If the caller is not running in a system thread context, it must ensure that any handles it creates are private handles. Otherwise, the handle can be accessed by the process in whose context the driver is running. For more information, see Object Handles.

If the call to this function occurs in user mode, you should use the name "NtOpenSection" instead of "ZwOpenSection".

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.


Requirement Value
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
DDI compliance rules HwStorPortProhibitedDDIs(storport), PowerIrpDDis(wdm)

See also



Using Nt and Zw Versions of the Native System Services Routines