github.com/etecs-ru/go-sys-wineventlog@v0.0.0-20210227233244-4c3abb794018/unix/dev_linux_test.go (about) 1 // Copyright 2017 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 //go:build go1.7 6 // +build go1.7 7 8 package unix_test 9 10 import ( 11 "fmt" 12 "testing" 13 14 "golang.org/x/sys/unix" 15 ) 16 17 func TestDevices(t *testing.T) { 18 testCases := []struct { 19 path string 20 major uint32 21 minor uint32 22 }{ 23 // well known major/minor numbers according to 24 // https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/devices.txt 25 {"/dev/null", 1, 3}, 26 {"/dev/zero", 1, 5}, 27 {"/dev/random", 1, 8}, 28 {"/dev/full", 1, 7}, 29 {"/dev/urandom", 1, 9}, 30 {"/dev/tty", 5, 0}, 31 } 32 for _, tc := range testCases { 33 t.Run(fmt.Sprintf("%s %v:%v", tc.path, tc.major, tc.minor), func(t *testing.T) { 34 var stat unix.Stat_t 35 err := unix.Stat(tc.path, &stat) 36 if err != nil { 37 if err == unix.EACCES { 38 t.Skip("no permission to stat device, skipping test") 39 } 40 t.Errorf("failed to stat device: %v", err) 41 return 42 } 43 44 dev := uint64(stat.Rdev) 45 if unix.Major(dev) != tc.major { 46 t.Errorf("for %s Major(%#x) == %d, want %d", tc.path, dev, unix.Major(dev), tc.major) 47 } 48 if unix.Minor(dev) != tc.minor { 49 t.Errorf("for %s Minor(%#x) == %d, want %d", tc.path, dev, unix.Minor(dev), tc.minor) 50 } 51 if unix.Mkdev(tc.major, tc.minor) != dev { 52 t.Errorf("for %s Mkdev(%d, %d) == %#x, want %#x", tc.path, tc.major, tc.minor, unix.Mkdev(tc.major, tc.minor), dev) 53 } 54 }) 55 56 } 57 }