feat: add daemonize demo

__misc/daemonize-demo/Cargo.lock

@@ -0,0 +1,32 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "boxfnonce"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5988cb1d626264ac94100be357308f29ff7cbdd3b36bda27f450a4ee3f713426"
+
+[[package]]
+name = "daemonize"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70c24513e34f53b640819f0ac9f705b673fcf4006d7aab8778bee72ebfc89815"
+dependencies = [
+ "boxfnonce",
+ "libc",
+]
+
+[[package]]
+name = "daemonize-demo"
+version = "0.1.0"
+dependencies = [
+ "daemonize",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.139"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"

__misc/daemonize-demo/Cargo.toml

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+[package]
+name = "daemonize-demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+daemonize = "0.4.1"

__misc/daemonize-demo/README.md

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+
+https://github.com/knsd/daemonize
+

__misc/daemonize-demo/src/main.rs

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+use std::fs::File;
+
+use daemonize::Daemonize;
+
+fn main() {
+    let stdout = File::create("/tmp/daemon.out").unwrap();
+    let stderr = File::create("/tmp/daemon.err").unwrap();
+
+    let daemonize = Daemonize::new()
+        .pid_file("/tmp/test.pid") // Every method except `new` and `start`
+        .chown_pid_file(true)      // is optional, see `Daemonize` documentation
+        .working_directory("/tmp") // for default behaviour.
+        .user("nobody")
+        .group("daemon") // Group name
+        .group(2)        // or group id.
+        .umask(0o777)    // Set umask, `0o027` by default.
+        .stdout(stdout)  // Redirect stdout to `/tmp/daemon.out`.
+        .stderr(stderr)  // Redirect stderr to `/tmp/daemon.err`.
+        .privileged_action(|| "Executed before drop privileges");
+
+    match daemonize.start() {
+        Ok(_) => println!("Success, daemonized"),
+        Err(e) => eprintln!("Error, {}", e),
+    }
+}