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#![allow(clippy::expect_used)]
#![allow(clippy::match_wild_err_arm)]
/// run with `cargo run --example example_touch_pid`
use std::{fs::OpenOptions, process::Command};
use fork::{Fork, daemon};
fn main() {
match daemon(false, false) {
Ok(Fork::Child) => {
// Touch a PID file from the daemon process itself
let file_name = format!("/tmp/{}.pid", std::process::id());
OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open(&file_name)
.expect("failed to open file");
// Do some work
Command::new("sleep")
.arg("300")
.output()
.expect("failed to execute process");
}
// Parent exits inside daemon(); this arm is unreachable.
Ok(Fork::Parent(_)) => unreachable!("daemon exits parent processes"),
Err(err) => eprintln!("daemon failed: {err}"),
}
}
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