daemonizr

Small crate which helps with writing daemon applications in Rust.

I am aware about daemonize and daemonize-me crates, but needed some extended functionality like locking PID file and searching for running daemon.

A complete example:

```rust use daemonizr::{Daemonizr, DaemonizrError, Group, Stderr, Stdout, User}; use std::{path::PathBuf, process::exit, thread::sleep, time::Duration};

fn main() { match Daemonizr::new() .workdir(PathBuf::from("/Users/alex/git/private/daemonizr")) .expect("invalid path") .asuser(User::byname("alex").expect("invalid user")) .asgroup(Group::byname("staff").expect("invalid group")) .pidfile(PathBuf::from("dmnzr.pid")) .stdout(Stdout::Redirect(PathBuf::from("dmnzr.out"))) .stderr(Stderr::Redirect(PathBuf::from("dmnzr.err"))) .umask(0o027) .expect("invalid umask") .spawn() { Err(DaemonizrError::AlreadyRunning) => { /* search for the daemon's PID */ match Daemonizr::new() .workdir(PathBuf::from("/Users/alex/git/private/daemonizr")) .unwrap() .pidfile(PathBuf::from("dmnzr.pid")) .search() { Err(x) => eprintln!("error: {}", x), Ok(pid) => { eprintln!("another daemon with pid {} is already running", pid); exit(1); } }; } Err(e) => eprintln!("DaemonizrError: {}", e), Ok(()) => { /* We are in daemon process now */ } };

/* actual daemon work goes here */
println!("write something to stdout");
eprintln!("write something to stderr");
sleep(Duration::from_secs(60));
println!("Daemon exits.")

} ```

Hint:

⚠️ This crate will only work on POSIX compatible systems, where the "nix" and "libc" crates are available.