vendor/golang.org/x/sys/unix/dev_linux_test.go

   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                                 t.Errorf("failed to stat device: %v", err)
  35                                 return
  36                         }
  37
  38                         dev := uint64(stat.Rdev)
  39                         if unix.Major(dev) != tc.major {
  40                                 t.Errorf("for %s Major(%#x) == %d, want %d", tc.path, dev, unix.Major(dev), tc.major)
  41                         }
  42                         if unix.Minor(dev) != tc.minor {
  43                                 t.Errorf("for %s Minor(%#x) == %d, want %d", tc.path, dev, unix.Minor(dev), tc.minor)
  44                         }
  45                         if unix.Mkdev(tc.major, tc.minor) != dev {
  46                                 t.Errorf("for %s Mkdev(%d, %d) == %#x, want %#x", tc.path, tc.major, tc.minor, unix.Mkdev(tc.major, tc.minor), dev)
  47                         }
  48                 })
  49
  50         }
  51 }