Struct std::process::ExitCode

pub struct ExitCode(_);

This type represents the status code the current process can return to its parent under normal termination.

ExitCode is intended to be consumed only by the standard library (via Termination::report()), and intentionally does not provide accessors like PartialEq, Eq, or Hash. Instead the standard library provides the canonical SUCCESS and FAILURE exit codes as well as From<u8> for ExitCode for constructing other arbitrary exit codes.

Portability

Numeric values used in this type don’t have portable meanings, and different platforms may mask different amounts of them.

For the platform’s canonical successful and unsuccessful codes, see the SUCCESS and FAILURE associated items.

Differences from ExitStatus

ExitCode is intended for terminating the currently running process, via the Termination trait, in contrast to ExitStatus, which represents the termination of a child process. These APIs are separate due to platform compatibility differences and their expected usage; it is not generally possible to exactly reproduce an ExitStatus from a child for the current process after the fact.

Examples

ExitCode can be returned from the main function of a crate, as it implements Termination:

use std::process::ExitCode;

fn main() -> ExitCode {
    if !check_foo() {
        return ExitCode::from(42);
    }

    ExitCode::SUCCESS
}

Implementations

impl ExitCode

pub const SUCCESS: ExitCode

The canonical ExitCode for successful termination on this platform.

Note that a ()-returning main implicitly results in a successful termination, so there’s no need to return this from main unless you’re also returning other possible codes.

pub const FAILURE: ExitCode

The canonical ExitCode for unsuccessful termination on this platform.

If you’re only returning this and SUCCESS from main, consider instead returning Err(_) and Ok(()) respectively, which will return the same codes (but will also eprintln! the error).

Trait Implementations

impl Clone for ExitCode

fn clone(&self) -> ExitCode

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExitCode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<u8> for ExitCode

fn from(code: u8) -> Self

Construct an ExitCode from an arbitrary u8 value.

impl Termination for ExitCode

fn report(self) -> ExitCode

Is called to get the representation of the value as status code. This status code is returned to the operating system.

impl Copy for ExitCode