Waiting for Child Process Completion in Rust

Introduction

In this lab, you can learn how to wait for a process::Child to finish by calling Child::wait, which will return a process::ExitStatus.

Note: If the lab does not specify a file name, you can use any file name you want. For example, you can use main.rs, compile and run it with rustc main.rs && ./main.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL rust(("Rust")) -.-> rust/BasicConceptsGroup(["Basic Concepts"]) rust(("Rust")) -.-> rust/DataTypesGroup(["Data Types"]) rust(("Rust")) -.-> rust/FunctionsandClosuresGroup(["Functions and Closures"]) rust(("Rust")) -.-> rust/DataStructuresandEnumsGroup(["Data Structures and Enums"]) rust/BasicConceptsGroup -.-> rust/variable_declarations("Variable Declarations") rust/BasicConceptsGroup -.-> rust/mutable_variables("Mutable Variables") rust/DataTypesGroup -.-> rust/string_type("String Type") rust/FunctionsandClosuresGroup -.-> rust/function_syntax("Function Syntax") rust/FunctionsandClosuresGroup -.-> rust/expressions_statements("Expressions and Statements") rust/DataStructuresandEnumsGroup -.-> rust/method_syntax("Method Syntax") subgraph Lab Skills rust/variable_declarations -.-> lab-99276{{"Waiting for Child Process Completion"}} rust/mutable_variables -.-> lab-99276{{"Waiting for Child Process Completion"}} rust/string_type -.-> lab-99276{{"Waiting for Child Process Completion"}} rust/function_syntax -.-> lab-99276{{"Waiting for Child Process Completion"}} rust/expressions_statements -.-> lab-99276{{"Waiting for Child Process Completion"}} rust/method_syntax -.-> lab-99276{{"Waiting for Child Process Completion"}} end

Wait

If you'd like to wait for a process::Child to finish, you must call Child::wait, which will return a process::ExitStatus.

use std::process::Command; fn main() { let mut child = Command::new("sleep").arg("5").spawn().unwrap(); let _result = child.wait().unwrap(); println!("reached end of main"); }

$ rustc wait.rs && ./wait ## `wait` keeps running for 5 seconds until the `sleep 5` command finishes reached end of main

Waiting for Child Process Completion

Introduction

Skills Graph

Wait

Summary