---
title: "args_get()"
description: "The args_get() function is used to read the command-line argument data provided to the WebAssembly module. The sizes of the buffers should match the values returned by the args_sizes_get() function."
url: "https://wasix.org/docs/api-reference/wasi/args_get/"
markdown: "https://wasix.org/docs/api-reference/wasi/args_get.md"
---

# `args_get()`

Read command-line argument data.

## Description

The `args_get()` function is used to read the command-line argument data provided to the WebAssembly module. The sizes of the buffers should match the values returned by the `args_sizes_get()` function.

## Syntax

```ebnf
  ;;; passed to the program by the user.
  ;;; and may even be a fixed string. Subsequent arguments are the arguments
  ;;; program. This need not be a usable filesystem path or even file name,
  ;;; The first argument should be a string containing the "name" of the
  ;;;
  ;;; Each argument is expected to be `\0` terminated.
  ;;;
  ;;; The size of the array should match that returned by `args_sizes_get`.
  ;;;
  ;;; Read command-line argument data.
  (@interface func (export "args_get")
    (param $argv (@witx pointer (@witx pointer u8)))
    (param $argv_buf (@witx pointer u8))
    (result $error (expected (error $errno)))
  )
```

## Parameters

- `ctx`: A mutable reference to the function environment.
- `argv`: A WebAssembly pointer to a buffer where the argument pointers will be written.
- `argv_buf`: A WebAssembly pointer to a buffer where the argument string data will be written.

## Return Value

The function returns an `Errno` value indicating the success or failure of the operation.

## Logging

This function has been instrumented with debug-level logging. It will log the following information:

- `args`: The command-line arguments in the WebAssembly module.

Please make sure the logging configuration is properly set up to capture the desired logs.

## Note

The `args_get()` function reads the command-line argument data provided to the WebAssembly module. The argument pointers and string data are written to the specified buffers. The actual data is retrieved from the WebAssembly module’s state.

---

[Documentation index](https://wasix.org/llms.txt) · [HTML version](https://wasix.org/docs/api-reference/wasi/args_get/)