NtSetEvent - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtSetEvent routine sets an event object to the signaled state.
 *
 * \param EventHandle A handle to the event object.
 * \param PreviousState A pointer to a variable that receives the previous state of the event object.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtSetEvent(
    _In_ HANDLE EventHandle,
    _Out_opt_ PLONG PreviousState
    );

#endif
#endif

View code on GitHub
#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSetEvent(
    _In_ HANDLE EventHandle,
    _Out_opt_ PLONG PreviousState
    );

#endif

View code on GitHub
// ntifs.h

NTSYSAPI NTSTATUS ZwSetEvent(
  [in]            HANDLE EventHandle,
  [out, optional] PLONG  PreviousState
);
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No description available.

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Windows Driver Kit DDI reference (nf-ntifs-zwsetevent)

ZwSetEvent function

Description

The ZwSetEvent routine sets an event object to a Signaled state and attempts to satisfy as many waits as possible.

Parameters

EventHandle [in]

A handle to an event object.

PreviousState [out, optional]

An optional pointer to a variable where the previous state of the event object is stored on output.

Return value

ZwSetEvent returns STATUS_SUCCESS or an appropriate error status. Possible error status codes include the following:

Return code Description
STATUS_ACCESS_DENIED The caller did not have the required privileges to modify the event specified by the EventHandle parameter.
STATUS_INSUFFICIENT_RESOURCES Resources required by this function could not be allocated.
STATUS_INVALID_HANDLE The supplied EventHandle parameter was invalid.

Remarks

ZwSetEvent sets an event object to a Signaled state and attempts to satisfy as many waits as possible.

Note If the call to the ZwSetEvent function occurs in user mode, you should use the name "NtSetEvent" instead of "ZwSetEvent".

For calls from kernel-mode drivers, the Nt*Xxx* and Zw*Xxx* 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 Nt*Xxx* and Zw*Xxx* versions of a routine, see Using Nt and Zw Versions of the Native System Services Routines.

See also

IoCreateNotificationEvent

IoCreateSynchronizationEvent

KeClearEvent

KeResetEvent

KeSetEvent

KeWaitForSingleObject

Using Nt and Zw Versions of the Native System Services Routines

ZwClose

ZwCreateEvent

ZwWaitForSingleObject

View the official Windows Driver Kit DDI reference

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NTinternals.net (undocumented.ntinternals.net)

This function is documented in Windows Driver Kit.

EventHandle

HANDLE to Event Object opened with EVENT_MODIFY_STATE access.

PreviousState

State of Event Object before function call.

Documented by

See also

Edit description on GitHub