---
name: "io_uring_wait_cqe"
section: "3"
platform: "linux"
package: "liburing"
version: "2.15-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/io_uring_wait_cqe"
---

# io\_uring\_wait\_cqe(3)

wait for one io\_uring completion event

## NAME

io\_uring\_wait\_cqe - wait for one io\_uring completion event

## SYNOPSIS

```
#include <liburing.h>
```

**int io\_uring\_wait\_cqe(struct io\_uring \****ring***,**                       **struct io\_uring\_cqe \*\****cqe\_ptr***);**

## DESCRIPTION

The [**io\_uring\_wait\_cqe**(3)](/io_uring_wait_cqe/3.md) function waits for an IO completion from the queue belonging to the *ring* param, waiting for it if necessary. If an event is already available in the ring when invoked, no waiting will occur. The *cqe\_ptr* param is filled in on success.

After the caller has submitted a request with [**io\_uring\_submit**(3)](/io_uring_submit/3.md), the application can retrieve the completion with [**io\_uring\_wait\_cqe**(3)](/io_uring_wait_cqe/3.md).

## RETURN VALUE

On success [**io\_uring\_wait\_cqe**(3)](/io_uring_wait_cqe/3.md) returns 0 and the cqe\_ptr param is filled in. On failure it returns **-errno**. The return value indicates the result of waiting for a CQE, and it has no relation to the CQE result itself.

## SEE ALSO

[**io\_uring\_submit**(3)](/io_uring_submit/3.md), [**io\_uring\_wait\_cqe\_timeout**(3)](/io_uring_wait_cqe_timeout/3.md), [**io\_uring\_wait\_cqes**(3)](/io_uring_wait_cqes/3.md)