multi: Move signal to internal package.

cmd/vspd/main.go

@@ -14,6 +14,7 @@ import (
 	"github.com/decred/dcrd/wire"
 	"github.com/decred/vspd/database"
 	"github.com/decred/vspd/internal/config"
+	"github.com/decred/vspd/internal/signal"
 	"github.com/decred/vspd/internal/version"
 	"github.com/decred/vspd/internal/vspd"
 	"github.com/decred/vspd/internal/webapi"
@@ -108,7 +109,7 @@ func run() int {
 
 	// Create a context that is canceled when a shutdown request is received
 	// through an interrupt signal such as SIGINT (Ctrl+C).
-	ctx := shutdownListener(log)
+	ctx := signal.ShutdownListener(log)
 
 	// Start the webapi server.
 	shutdownWg.Add(1)

internal/signal/signal.go

@@ -3,7 +3,7 @@
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
-package main
+package signal
 
 import (
 	"context"
@@ -17,10 +17,10 @@ import (
 // shutdown. This may be modified during init depending on the platform.
 var interruptSignals = []os.Signal{os.Interrupt}
 
-// shutdownListener listens for OS Signals such as SIGINT (Ctrl+C) and shutdown
+// ShutdownListener listens for OS Signals such as SIGINT (Ctrl+C) and shutdown
 // requests from requestShutdown. It returns a context that is canceled when
 // either signal is received.
-func shutdownListener(log slog.Logger) context.Context {
+func ShutdownListener(log slog.Logger) context.Context {
 	ctx, cancel := context.WithCancel(context.Background())
 	go func() {
 		interruptChannel := make(chan os.Signal, 1)

internal/signal/signal_syscall.go

@@ -5,7 +5,7 @@
 
 //go:build windows || aix || android || darwin || dragonfly || freebsd || hurd || illumos || ios || linux || netbsd || openbsd || solaris
 
-package main
+package signal
 
 import (
 	"syscall"