mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 21:15:39 +00:00
52 lines
1008 B
Go
52 lines
1008 B
Go
// Copyright (c) 2021 Tailscale Inc & 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 metrics
|
|
|
|
import (
|
|
"os"
|
|
"runtime"
|
|
"testing"
|
|
)
|
|
|
|
func TestCurrentFileDescriptors(t *testing.T) {
|
|
if runtime.GOOS != "linux" {
|
|
t.Skipf("skipping on %v", runtime.GOOS)
|
|
}
|
|
n := CurrentFDs()
|
|
if n < 3 {
|
|
t.Fatalf("got %v; want >= 3", n)
|
|
}
|
|
|
|
allocs := int(testing.AllocsPerRun(100, func() {
|
|
n = CurrentFDs()
|
|
}))
|
|
if allocs != 0 {
|
|
t.Errorf("allocs = %v; want 0", allocs)
|
|
}
|
|
|
|
// Open some FDs.
|
|
const extra = 10
|
|
for i := 0; i < extra; i++ {
|
|
f, err := os.Open("/proc/self/stat")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer f.Close()
|
|
t.Logf("fds for #%v = %v", i, CurrentFDs())
|
|
}
|
|
|
|
n2 := CurrentFDs()
|
|
if n2 < n+extra {
|
|
t.Errorf("fds changed from %v => %v, want to %v", n, n2, n+extra)
|
|
}
|
|
}
|
|
|
|
func BenchmarkCurrentFileDescriptors(b *testing.B) {
|
|
b.ReportAllocs()
|
|
for i := 0; i < b.N; i++ {
|
|
_ = CurrentFDs()
|
|
}
|
|
}
|