feat: add daemonize demo

__misc/daemonize-demo/src/main.rs

@@ -0,0 +1,25 @@
+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),
+    }
+}