tools/zedmon/fake_zedmon/fake_zedmon.go

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package main

import (
	"log"
	"os"
	"os/signal"
	"path/filepath"
)

// This program writes predefined data to stderr and stdout. It expects to find
// the predefined data in two files given by its own path plus the suffixes
// ".stderr.testdata" and ".stdout.testdata".
//
// It will terminate when it has both written its data and received a SIGINT.
func main() {
	// Trap SIGINT. This program will wait to exit until the corresponding channel is notified.
	sigint := make(chan os.Signal)
	signal.Notify(sigint, os.Interrupt)

	myPath, err := filepath.Abs(os.Args[0])
	stderrDataPath := myPath + ".stderr.testdata"
	stdoutDataPath := myPath + ".stdout.testdata"

	stderrData, err := os.ReadFile(stderrDataPath)
	if err != nil {
		log.Fatalf("Failed to read file %s with error %v", stderrDataPath, err)
	}
	stdoutData, err := os.ReadFile(stdoutDataPath)
	if err != nil {
		log.Fatalf("Failed to read file %s with error %v", stdoutDataPath, err)
	}

	os.Stderr.Write(stderrData)
	os.Stdout.Write(stdoutData)

	<-sigint
}