Struct snarkvm_wasm::process::ExitStatus

pub struct ExitStatus(_);

Describes the result of a process after it has terminated.

This struct is used to represent the exit status or other termination of a child process. Child processes are created via the Command struct and their exit status is exposed through the status method, or the wait method of a Child process.

An ExitStatus represents every possible disposition of a process. On Unix this is the wait status. It is not simply an exit status (a value passed to exit).

For proper error reporting of failed processes, print the value of ExitStatus or ExitStatusError using their implementations of Display.

Differences from ExitCode

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.

Implementations

impl ExitStatus

pub fn exit_ok(&self) -> Result<(), ExitStatusError>

🔬This is a nightly-only experimental API. (exit_status_error)

Was termination successful? Returns a Result.

Examples

#![feature(exit_status_error)]
use std::process::Command;

let status = Command::new("ls")
                     .arg("/dev/nonexistent")
                     .status()
                     .expect("ls could not be executed");

println!("ls: {status}");
status.exit_ok().expect_err("/dev/nonexistent could be listed!");

pub fn success(&self) -> bool

Was termination successful? Signal termination is not considered a success, and success is defined as a zero exit status.

Examples

use std::process::Command;

let status = Command::new("mkdir")
                     .arg("projects")
                     .status()
                     .expect("failed to execute mkdir");

if status.success() {
    println!("'projects/' directory created");
} else {
    println!("failed to create 'projects/' directory: {status}");
}

pub fn code(&self) -> Option<i32>

Returns the exit code of the process, if any.

In Unix terms the return value is the exit status: the value passed to exit, if the process finished by calling exit. Note that on Unix the exit status is truncated to 8 bits, and that values that didn’t come from a program’s call to exit may be invented by the runtime system (often, for example, 255, 254, 127 or 126).

On Unix, this will return None if the process was terminated by a signal. ExitStatusExt is an extension trait for extracting any such signal, and other details, from the ExitStatus.

Examples

use std::process::Command;

let status = Command::new("mkdir")
                     .arg("projects")
                     .status()
                     .expect("failed to execute mkdir");

match status.code() {
    Some(code) => println!("Exited with status code: {code}"),
    None       => println!("Process terminated by signal")
}

Trait Implementations

impl Clone for ExitStatus

fn clone(&self) -> ExitStatus

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ExitStatus

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

Formats the value using the given formatter.

impl Display for ExitStatus

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

Formats the value using the given formatter.

impl ExitStatusExt for ExitStatus

fn from_raw(raw: i32) -> ExitStatus

Creates a new ExitStatus or ExitStatusError from the raw underlying integer status value from wait

fn signal(&self) -> Option<i32>

If the process was terminated by a signal, returns that signal.

fn core_dumped(&self) -> bool

If the process was terminated by a signal, says whether it dumped core.

fn stopped_signal(&self) -> Option<i32>

If the process was stopped by a signal, returns that signal.

fn continued(&self) -> bool

Whether the process was continued from a stopped status.

fn into_raw(self) -> i32

Returns the underlying raw wait status.

impl Into<ExitStatus> for ExitStatusError

fn into(self) -> ExitStatus

Converts this type into the (usually inferred) input type.

impl PartialEq<ExitStatus> for ExitStatus

fn eq(&self, other: &ExitStatus) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ExitStatus

impl Eq for ExitStatus

impl StructuralEq for ExitStatus

impl StructuralPartialEq for ExitStatus