golang.org/x/sys@v0.20.1-0.20240517151509-673e0f94c16d/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 package unix_test 6 7 import ( 8 "fmt" 9 "testing" 10 11 "golang.org/x/sys/unix" 12 ) 13 14 func TestDevices(t *testing.T) { 15 testCases := []struct { 16 path string 17 major uint32 18 minor uint32 19 }{ 20 // well known major/minor numbers according to 21 // https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/devices.txt 22 {"/dev/null", 1, 3}, 23 {"/dev/zero", 1, 5}, 24 {"/dev/random", 1, 8}, 25 {"/dev/full", 1, 7}, 26 {"/dev/urandom", 1, 9}, 27 {"/dev/tty", 5, 0}, 28 } 29 for _, tc := range testCases { 30 t.Run(fmt.Sprintf("%s %v:%v", tc.path, tc.major, tc.minor), func(t *testing.T) { 31 var stat unix.Stat_t 32 err := unix.Stat(tc.path, &stat) 33 if err != nil { 34 if err == unix.EACCES { 35 t.Skip("no permission to stat device, skipping test") 36 } 37 t.Errorf("failed to stat device: %v", err) 38 return 39 } 40 41 dev := uint64(stat.Rdev) 42 if unix.Major(dev) != tc.major { 43 t.Errorf("for %s Major(%#x) == %d, want %d", tc.path, dev, unix.Major(dev), tc.major) 44 } 45 if unix.Minor(dev) != tc.minor { 46 t.Errorf("for %s Minor(%#x) == %d, want %d", tc.path, dev, unix.Minor(dev), tc.minor) 47 } 48 if unix.Mkdev(tc.major, tc.minor) != dev { 49 t.Errorf("for %s Mkdev(%d, %d) == %#x, want %#x", tc.path, tc.major, tc.minor, unix.Mkdev(tc.major, tc.minor), dev) 50 } 51 }) 52 53 } 54 }