package main

import (
	"os"
	"os/signal"

	"golang.org/x/sys/unix"
	"novit.nc/direktil/pkg/log"
)

func handleChildren() {
	// set us as a sub-reaper
	if err := unix.Prctl(unix.PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0); err != nil {
		initLog.Taintf(log.Error, "reaper: failed to set myself a child sub-reaper: %v", err)
	}

	sigchld := make(chan os.Signal, 10)
	signal.Notify(sigchld, unix.SIGCHLD)

	for range sigchld {
		// reap children
		var (
			ws  unix.WaitStatus
			rus unix.Rusage
		)
		for {
			pid, err := unix.Wait4(-1, &ws, unix.WNOHANG, &rus)
			if err != nil {
				if err == unix.ECHILD {
					break
				}
				initLog.Taintf(log.Warning, "reaper: wait4 failed: %v", err)
			}
			if pid <= 0 {
				break
			}
		}
	}
}