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# nng_aio_finish
## NAME
nng_aio_finish --- finish asynchronous I/O operation
## SYNOPSIS
```c
#include <nng/nng.h>
void nng_aio_finish(nng_aio *aio, int err);
```
## DESCRIPTION
The `nng_aio_finish()` function marks operation associated with _aio_ as
complete, with the status _err_.
This will be the result returned by [`nng_aio_result()`][nng_aio_result].
This function causes the callback associated with the _aio_ to called.
> [!IMPORTANT]
> It is mandatory that operation providers call this function
> _exactly once_ when they are finished with the operation.
> After calling this function, the provider _must not_ perform any
> further accesses to the _aio_.
> [!TIP]
> This function is only for I/O providers (those actually performing
> the operation such as HTTP handler functions or transport providers); ordinary
> users of the _aio_ should not have any need for this function.
## SEE ALSO
[nng_aio_begin][nng_aio_begin],
[nng_aio_cancel][nng_aio_cancel],
[nng_aio_defer][nng_aio_defer],
[nng_aio_result][nng_aio_result]
{{#include ../refs.md}}
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