Change project layout to make easier debug / tests"

internal/lib/spawn.go

@@ -0,0 +1,59 @@
+package lib
+
+import (
+	"log"
+	"os"
+	"os/exec"
+	"syscall"
+	"time"
+)
+
+// RunChan to this channel we send command and its argv to execute as separate process.
+var RunChan = make(chan []string, 128)
+
+// Spawner forks and execs given program, and also detaches form its control tty.
+func (c MyConfig) Spawner() {
+	for prg := range RunChan {
+		devnullR, _ := os.Open(os.DevNull)
+		devnullW, _ := os.OpenFile(os.DevNull, os.O_WRONLY|os.O_APPEND, 0644)
+
+		spa := syscall.SysProcAttr{
+			Setsid:     true,
+			Foreground: false,
+		}
+
+		pa := syscall.ProcAttr{
+			Dir:   os.Getenv(`HOME`),
+			Env:   os.Environ(),
+			Files: []uintptr{devnullR.Fd(), devnullW.Fd(), devnullW.Fd()},
+			Sys:   &spa,
+		}
+
+		bin, err := exec.LookPath(prg[0])
+
+		if err != nil {
+			log.Printf("Unable to spawn %s: %s", prg[0], err)
+		}
+
+		_, err = syscall.ForkExec(bin, prg, &pa)
+
+		if err != nil {
+			log.Printf("Unable to spawn %s: %s", prg[0], err)
+		}
+
+		// Close file errors we don't handle :) at all.
+		_ = devnullR.Close()
+		_ = devnullW.Close()
+	}
+}
+
+// CleanZombies reaps processes spawned by Spawner() and already exited.
+func (c MyConfig) CleanZombies() {
+	r := syscall.Rusage{}
+
+	for {
+		_, _ = syscall.Wait4(-1, nil, 0, &r)
+
+		time.Sleep(1 * time.Minute)
+	}
+}