Revert ignoring SIGCHLD

Using signal.Ignore causes exec.Command failed with no child process
error.

internal/router/service_ddwrt.go

@@ -159,9 +159,8 @@ func (s *ddwrtSvc) Run() (err error) {
 
 	if interactice, _ := isInteractive(); !interactice {
 		signal.Ignore(syscall.SIGHUP)
-		signal.Ignore(sigCHLD)
 	}
-	var sigChan = make(chan os.Signal, 2)
+	var sigChan = make(chan os.Signal, 1)
 	signal.Notify(sigChan, syscall.SIGTERM, os.Interrupt)
 	<-sigChan
 

internal/router/service_merlin.go

@@ -172,10 +172,9 @@ func (s *merlinSvc) Run() (err error) {
 
 	if interactice, _ := isInteractive(); !interactice {
 		signal.Ignore(syscall.SIGHUP)
-		signal.Ignore(sigCHLD)
 	}
 
-	var sigChan = make(chan os.Signal, 3)
+	var sigChan = make(chan os.Signal, 1)
 	signal.Notify(sigChan, syscall.SIGTERM, os.Interrupt)
 	<-sigChan
 

internal/router/service_ubios.go

@@ -170,7 +170,6 @@ func (s *ubiosSvc) Run() (err error) {
 
 	if interactice, _ := isInteractive(); !interactice {
 		signal.Ignore(syscall.SIGHUP)
-		signal.Ignore(sigCHLD)
 	}
 
 	var sigChan = make(chan os.Signal, 3)

internal/router/signal.go

@@ -1,7 +0,0 @@
-//go:build !windows
-
-package router
-
-import "syscall"
-
-const sigCHLD = syscall.SIGCHLD

internal/router/signal_windows.go

@@ -1,5 +0,0 @@
-package router
-
-import "syscall"
-
-const sigCHLD = syscall.SIGHUP