docs/reference/syscalls/event_create.md

# zx_event_create

## NAME

<!-- Updated by update-docs-from-fidl, do not edit. -->

Create an event.

## SYNOPSIS

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```c
#include <zircon/syscalls.h>

zx_status_t zx_event_create(uint32_t options, zx_handle_t* out);
```

## DESCRIPTION

`zx_event_create()` creates an event, which is an object that is signalable. That
is, its **ZX_USER_SIGNAL_n** (where *n* is 0 through 7) signals can be
manipulated using [`zx_object_signal()`].

The newly-created handle will have the [basic
rights](/docs/concepts/kernel/rights.md#zx_rights_basic) plus **ZX_RIGHT_SIGNAL**.

## RIGHTS

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TODO(fxbug.dev/32253)

## RETURN VALUE

`zx_event_create()` returns **ZX_OK** and a valid event handle (via *out*) on success.
On failure, an error value is returned.

## ERRORS

**ZX_ERR_INVALID_ARGS**  *out* is an invalid pointer, or *options* is nonzero.

**ZX_ERR_NO_MEMORY**  Failure due to lack of memory.
There is no good way for userspace to handle this (unlikely) error.
In a future build this error will no longer occur.

## SEE ALSO

 - [`zx_eventpair_create()`]
 - [`zx_handle_close()`]
 - [`zx_handle_duplicate()`]
 - [`zx_handle_replace()`]
 - [`zx_object_signal()`]
 - [`zx_object_wait_async()`]
 - [`zx_object_wait_many()`]
 - [`zx_object_wait_one()`]

<!-- References updated by update-docs-from-fidl, do not edit. -->

[`zx_eventpair_create()`]: eventpair_create.md
[`zx_handle_close()`]: handle_close.md
[`zx_handle_duplicate()`]: handle_duplicate.md
[`zx_handle_replace()`]: handle_replace.md
[`zx_object_signal()`]: object_signal.md
[`zx_object_wait_async()`]: object_wait_async.md
[`zx_object_wait_many()`]: object_wait_many.md
[`zx_object_wait_one()`]: object_wait_one.md