wip: starter and reaper works

Cargo.toml

@@ -6,5 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-nix = {version = "0.27.1", features = ["process"]}
+nix = {version = "0.27.1", features = ["process", "signal"]}
 tokio = { version = "1.34.0", features = ["full"] }

src/init/daemon.rs

@@ -1,19 +1,42 @@
 mod sighandler;
 mod waiter;
+mod starter;
 
 use std::error;
-use tokio::task::{self, JoinHandle};
+use tokio::task::JoinSet;
 use tokio::sync::watch;
 
 pub async fn start() -> Result<(), Box<dyn error::Error>> {
     let (tx, mut _rx) = watch::channel::<i32>(1);
 
-    let sig_handler_fn: JoinHandle<Result<(), Box<dyn error::Error + Send + Sync>>> = task::spawn(async move {
+    let mut set: JoinSet<Result<(), Box<dyn error::Error + Send + Sync>>> = JoinSet::new();
+    set.spawn(async move {
         sighandler::sighandler(tx).await
     });
 
-    if let Err(v) = sig_handler_fn.await? {
-        return Err(v as Box<dyn error::Error>)
+    //TODO: start the process starter
+    starter::start_process(&mut set);
+
+    //TODO: spawn_blocking for waiter
+    set.spawn_blocking(move || {
+        waiter::wait_all();
+        Ok(())
+    });
+
+    //TODO: we can't just return error when we got an error from a task
+    while let Some(res) = set.join_next().await {
+        match res {
+            Ok(v) => {
+                if let Err(ev) = v {
+                    dbg!(&ev);
+                    return Err(ev as Box<dyn error::Error>);
+                }
+            },
+            Err(e) => {
+                dbg!(&e);
+                return Err(e.into());
+            },
+        }
     }
 
     Ok(())

src/init/daemon/starter.rs

@@ -0,0 +1,36 @@
+use tokio::task::JoinSet;
+use tokio::process::Command;
+use std::error;
+
+pub fn start_process(ts: &mut JoinSet<Result<(), Box<dyn error::Error + Send + Sync>>>) {
+    for _j in 0..5 {
+        ts.spawn(async move {
+            for _i in 0..5 {
+                let mut child = Command::new("sleep").arg("1")
+                    .spawn()
+                    .expect("failed to spawn");
+
+                match child.wait().await {
+                    Ok(status) => {
+                        println!("starter: sleep exited: {}", status);
+                    },
+                    Err(e) => {
+                        if let Some(eos) = e.raw_os_error() {
+                            if eos != nix::Error::ECHILD as i32 {
+                                return Err(e.into());
+                            }
+                        } else {
+                            return Err(e.into());
+                        }
+                    },
+                }
+                // let status = child.wait().await?;
+                // println!("starter: sleep exited: {}", status);
+            }
+            println!("starter: task completed");
+            Ok(())
+        });
+
+    }
+    println!("starter: spawning completed");
+}

src/init/daemon/waiter.rs

@@ -1,10 +1,33 @@
-use nix::sys::wait;
+use nix::errno::Errno;
+use nix::sys::wait::{self, WaitStatus};
 use nix::unistd::Pid;
 
-#[allow(dead_code)]
-fn wait_all() {
-    match wait::waitpid(Pid::from_raw(-1), Some(wait::WaitPidFlag::WNOHANG)) {
-        Ok(_x) => {},
-        Err(_err) => {},
+pub fn wait_all() {
+    'wait: loop {
+        match wait::waitpid(Pid::from_raw(-1), None) {
+            Ok(x) => {
+                // dbg!(x);
+                match x {
+                    WaitStatus::Exited(pid, v) => {
+                        println!("wait_all: pid {}: exited with status {}", pid, v);
+                    },
+                    WaitStatus::Signaled(pid, sig, _dumped) => {
+                        println!("wait_all: pid {} killed with signal {}", pid, sig);
+                    },
+                    _ => {}
+                }
+            },
+            Err(err) => {
+                dbg!(err);
+                match err {
+                    Errno::ECHILD => {
+                        break 'wait;
+                    },
+                    _ => {}
+                }
+            },
+        }
+        // dbg!("sanity");
     }
+
 }