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// run
//go:build !nacl && !js && !wasip1 && !gccgo
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
// Ensure that deadlock detection can still
// run even with an import of "_ os/signal".
package main
import (
"bytes"
"context"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"time"
)
const prog = `
package main
import _ "os/signal"
func main() {
c := make(chan int)
c <- 1
}
`
func main() {
dir, err := ioutil.TempDir("", "21576")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(dir)
file := filepath.Join(dir, "main.go")
if err := ioutil.WriteFile(file, []byte(prog), 0655); err != nil {
log.Fatalf("Write error %v", err)
}
// Using a timeout of 1 minute in case other factors might slow
// down the start of "go run". See https://golang.org/issue/34836.
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
cmd := exec.CommandContext(ctx, "go", "run", file)
output, err := cmd.CombinedOutput()
if err == nil {
log.Fatalf("Passed, expected an error")
}
want := []byte("fatal error: all goroutines are asleep - deadlock!")
if !bytes.Contains(output, want) {
log.Fatalf("Unmatched error message %q:\nin\n%s\nError: %v", want, output, err)
}
}