---
name: "nng_aio_set_input"
section: "3"
platform: "linux"
package: "libnng-dev"
version: "1.10.1-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/nng_aio_set_input"
---

# nng\_aio\_set\_input(3)

set input parameter

## NAME

nng\_aio\_set\_input - set input parameter

## SYNOPSIS

```
#include <nng/nng.h>
void nng_aio_set_input(nng_aio *aio, unsigned int index, void *param);
```

## DESCRIPTION

The `nng_aio_set_input()` function sets the input parameter at *index* to *param* for the asynchronous operation associated with *aio*.

The type and semantics of input parameters are determined by specific operations; the caller must supply appropriate inputs for the operation to be performed.

The valid values of *index* range from zero (0) to three (3), as no operation currently defined can accept more than four parameters. (This limit could increase in the future.)

**Note**\

If the *index* does not correspond to a defined input for the operation, then this function will have no effect.

**Important**\

It is an error to call this function while the *aio* is currently in use by an active asynchronous operation.

An input parameter set with this function may be retrieved later with the `nng_aio_get_input()` function.

## RETURN VALUES

None.

## ERRORS

None.

## SEE ALSO

[nng\_aio\_alloc(3)](/nng_aio_alloc/3.md), [nng\_aio\_get\_input(3)](/nng_aio_get_input/3.md), [nng\_aio\_get\_output(3)](/nng_aio_get_output/3.md), [nng\_aio\_result(3)](/nng_aio_result/3.md), [nng\_aio(5)](/nng_aio/5.md), [nng(7)](/nng/7.md)