github.com/fisco-bcos/crypto@v0.0.0-20200202032121-bd8ab0b5d4f1/internal/poll/read_test.go (about) 1 // Copyright 2019 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package poll_test 6 7 import ( 8 "io/ioutil" 9 "os" 10 "runtime" 11 "sync" 12 "testing" 13 "time" 14 ) 15 16 func TestRead(t *testing.T) { 17 t.Run("SpecialFile", func(t *testing.T) { 18 var wg sync.WaitGroup 19 for _, p := range specialFiles() { 20 for i := 0; i < 4; i++ { 21 wg.Add(1) 22 go func(p string) { 23 defer wg.Done() 24 for i := 0; i < 100; i++ { 25 if _, err := ioutil.ReadFile(p); err != nil { 26 t.Error(err) 27 return 28 } 29 time.Sleep(time.Nanosecond) 30 } 31 }(p) 32 } 33 } 34 wg.Wait() 35 }) 36 } 37 38 func specialFiles() []string { 39 var ps []string 40 switch runtime.GOOS { 41 case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd": 42 ps = []string{ 43 "/dev/null", 44 } 45 case "linux": 46 ps = []string{ 47 "/dev/null", 48 "/proc/stat", 49 "/sys/devices/system/cpu/online", 50 } 51 } 52 nps := ps[:0] 53 for _, p := range ps { 54 f, err := os.Open(p) 55 if err != nil { 56 continue 57 } 58 f.Close() 59 nps = append(nps, p) 60 } 61 return nps 62 }