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// Copyright 2015 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package fileutil
import (
"io/ioutil"
"os"
"path/filepath"
"strconv"
"sync"
"testing"
)
func TestProcessTempDir(t *testing.T) {
for try := 0; try < 10; try++ {
func() {
tmp, err := ioutil.TempDir("", "syz")
if err != nil {
t.Fatalf("failed to create a temp dir: %v", err)
}
defer os.RemoveAll(tmp)
const P = 16
// Pre-create half of the instances with stale pid.
var dirs []string
for i := 0; i < P/2; i++ {
dir, err := ProcessTempDir(tmp)
if err != nil {
t.Fatalf("failed to create process temp dir")
}
dirs = append(dirs, dir)
}
for _, dir := range dirs {
if err := ioutil.WriteFile(filepath.Join(dir, ".pid"), []byte(strconv.Itoa(999999999)), 0600); err != nil {
t.Fatalf("failed to write pid file: %v", err)
}
}
// Now request a bunch of instances concurrently.
done := make(chan bool)
allDirs := make(map[string]bool)
var mu sync.Mutex
for p := 0; p < P; p++ {
go func() {
defer func() {
done <- true
}()
dir, err := ProcessTempDir(tmp)
if err != nil {
t.Fatalf("failed to create process temp dir")
}
mu.Lock()
present := allDirs[dir]
allDirs[dir] = true
mu.Unlock()
if present {
t.Fatalf("duplicate dir %v", dir)
}
}()
}
for p := 0; p < P; p++ {
<-done
}
}()
}
}
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