environ_sizes_get()

Return environment variable data sizes.

Description

The environ_sizes_get() function is used to retrieve the sizes of the environment variable data. It returns the number of environment variables and the size of the environment variable string data.

Syntax

  ;;; Return environment variable data sizes.
  (@interface func (export "environ_sizes_get")
    ;;; Returns the number of environment variable arguments and the size of the
    ;;; environment variable data.
    (result $error (expected (tuple $size $size) (error $errno)))
  )

Parameters

• ctx: A mutable reference to the function environment.
• environ_count: A WebAssembly pointer to a memory location where the number of environment variables will be written.
• environ_buf_size: A WebAssembly pointer to a memory location where the size of the environment variable 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 trace-level logging. It will log the following information:

• %env_var_count: The number of environment variables.
• %env_buf_size: The size of the environment variable string data.

Note

The environ_sizes_get() function returns the sizes of the environment variable data provided to the WebAssembly module. The number of environment variables and the size of the environment variable string data are written to the specified memory locations.