Macro enum_labeled 

macro_rules! enum_labeled {
    (
        $enum_vis:vis $enum_identifier:ident,
        $enum_discriminant_type:ty,
        $enum_label:expr,
        [
            $(
                [
                    $variant_discriminant:expr;
                    $variant_identifier:ident;
                    $variant_type:ty;
                    $variant_const_identifier:ident;
                    $variant_acronym:expr;
                    $variant_description:expr
                ]
            ),* $(,)?
        ]
    ) => { ... };
}

A macro that defines an error type and error handling for syscalls.

This macro generates:

1. An Error enum with the specified variants and their associated discriminant values
2. ErrorTrait implementation for the Error type with proper discriminant mapping
3. An discriminant module with standard Linux error constants
4. Into implementation for the Error type
5. A handle_result function that maps arch errors to syscall errors

Arguments

• $enum_identifier - The name of the error enum (usually Error)
• $variant - The variant name in the crate::result::Error enum (e.g., Open, Read, Write)
• $enum_label - String slice with the syscall name
• A list of error variants with their descriptions, discriminant values and Linux standard constant names [VariantName, discriminant_value, “description”, “LINUX_CONSTANT”]

Example

$enum_identifier:ident,
$variant:ty,
$enum_label:expr,
[
    $(
        [
            $variant_discriminant:expr;
            $variant_identifier:ident;
            $variant_const_identifier:ident;
            $variant_acronym:expr;
            $variant_description:expr
        ]
    ),* $(,)?
]