Distinguishable exit codes

0: normal or expected exit
1: error before server finished starting
2: double SIGINT (force quit)
3: error stopping with SIGQUIT
4: shutdown callback(s) returned error(s)

sigtrap.go

@@ -33,7 +33,7 @@ func trapSignalsCrossPlatform() {
 				if PidFile != "" {
 					os.Remove(PidFile)
 				}
-				os.Exit(1)
+				os.Exit(2)
 			}
 
 			log.Println("[INFO] SIGINT: Shutting down")
@@ -62,7 +62,7 @@ func executeShutdownCallbacks(signame string) (exitCode int) {
 			for _, err := range errs {
 				log.Printf("[ERROR] %s shutdown: %v", signame, err)
 			}
-			exitCode = 1
+			exitCode = 4
 		}
 	})
 	return

sigtrap_posix.go

@@ -30,7 +30,7 @@ func trapSignalsPosix() {
 				err := Stop()
 				if err != nil {
 					log.Printf("[ERROR] SIGQUIT stop: %v", err)
-					exitCode = 1
+					exitCode = 3
 				}
 				if PidFile != "" {
 					os.Remove(PidFile)