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## nng_aio_cancel
Cancel asynchronous I/O operation.
### Synopsis
```c
#include <nng/nng.h>
void nng_aio_cancel(nng_aio *aio);
```
### Description
The `nng_aio_cancel` function aborts an operation previously started with the handle _aio_.
If the operation is aborted, then the callback for the handle will be called, and the function xref:nng_aio_result.adoc[`nng_aio_result`] will return the error `NNG_ECANCELED`.
This function does not wait for the operation to be fully aborted, but returns immediately.
If no operation is currently in progress (either because it has already finished, or no operation has been started yet), then this function has no effect.
This function is the same as calling
xref:nng_aio_abort.adoc[`nng_aio_abort`] with the error `NNG_ECANCELED`.
## See Also
xref:nng_aio_abort.adoc[nng_aio_abort],
xref:nng_aio_result.adoc[nng_aio_result],
xref:nng_aio_wait.adoc[nng_aio_wait]
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