1// Copyright 2018 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
5package syscall_test
6
7import (
8	"syscall"
9	"testing"
10)
11
12// testalias checks for aliasing of error strings returned by sys1 and sys2,
13// which both call the function named fn in package syscall
14func testalias(t *testing.T, fn string, sys1, sys2 func() error) {
15	err := sys1().Error()
16	errcopy := string([]byte(err))
17	sys2()
18	if err != errcopy {
19		t.Errorf("syscall.%s error string changed from %q to %q\n", fn, errcopy, err)
20	}
21}
22
23// issue 13770: errors cannot be nested in Plan 9
24
25func TestPlan9Syserr(t *testing.T) {
26	testalias(t,
27		"Syscall",
28		func() error {
29			return syscall.Mkdir("/", 0)
30		},
31		func() error {
32			return syscall.Mkdir("#", 0)
33		})
34	testalias(t,
35		"Syscall6",
36		func() error {
37			return syscall.Mount(0, 0, "", 0, "")
38		},
39		func() error {
40			return syscall.Mount(-1, 0, "", 0, "")
41		})
42	// originally failed only on plan9_arm
43	testalias(t,
44		"seek",
45		func() error {
46			_, err := syscall.Seek(0, 0, -1)
47			return err
48		},
49		func() error {
50			_, err := syscall.Seek(-1, 0, 0)
51			return err
52		})
53}
54