Switch to real standard, fix daemonization on real standard

schemes/udpd/src/main.rs

@@ -8,7 +8,7 @@ use std::collections::{BTreeMap, VecDeque};
 use std::cell::RefCell;
 use std::fs::File;
 use std::io::{self, Read, Write};
-use std::{mem, slice, str, thread};
+use std::{mem, slice, str};
 use std::os::unix::io::FromRawFd;
 use std::rc::Rc;
 
@@ -319,7 +319,8 @@ impl SchemeMut for Udpd {
 }
 
 fn main() {
-    thread::spawn(move || {
+    // Daemonize
+    if unsafe { syscall::clone(0).unwrap() } == 0 {
         let scheme_fd = syscall::open(":udp", O_RDWR | O_CREAT | O_NONBLOCK).expect("udpd: failed to create :udp");
         let scheme_file = unsafe { File::from_raw_fd(scheme_fd) };
 
@@ -344,5 +345,5 @@ fn main() {
         event_queue.trigger_all(0).expect("udpd: failed to trigger event queue");
 
         event_queue.run().expect("udpd: failed to run event queue");
-    });
+    }
 }