Add elvish-stub.

elvish-stub/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+// TODO Need to learn the semantics handle of SIGHUP and see if it deserves
+// special treatment.
+func main() {
+	signalChan := make(chan os.Signal)
+	signal.Notify(signalChan)
+	fmt.Println("ok")
+	os.Stdout.Sync()
+	for sig := range signalChan {
+		fmt.Println(int(sig.(syscall.Signal)))
+		os.Stdout.Sync()
+	}
+}

elvish-stub/test.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+fail() {
+	echo "$*; log left at $log"
+	exit 1
+}
+
+log=`mktemp elvishXXXXX`
+
+# Start elvish-stub.
+elvish-stub > $log &
+stub=$!
+
+sleep 0.1
+
+# Wait for startup message.
+test `tail -n1 $log` == ok || {
+	fail "no startup message or startup too slow"
+}
+
+# Send a SIGINT.
+kill -2 $stub
+ps $stub >/dev/null || {
+	fail "stub killed by SIGTERM"
+}
+test `tail -n1 $log` == 2 || {
+	fail "stub didn't record SIGTERM"
+}
+
+# Really kill stub.
+kill -9 $stub
+
+rm $log