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033028a6b4
Add Major, Minor and Mkdev functions for converting devices numbers to their major/minor components and vice versa. The functions follow the behavior of the macros defined in OpenBSD's sys/types.h header. However, the parameter and return types are changed to match the existing implementations of these functions. Test the conversion macros with some well-known device numbers. Updates golang/go#8106 Change-Id: Ia50b7ccab18ff7c7e9dd77ddc7e4aa6cf5c79963 Reviewed-on: https://go-review.googlesource.com/63070 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package unix_test
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import (
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"fmt"
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"testing"
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"golang.org/x/sys/unix"
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)
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func TestDevices(t *testing.T) {
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testCases := []struct {
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path string
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major uint32
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minor uint32
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}{
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// well known major/minor numbers according to /dev/MAKEDEV on
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// OpenBSD 6.0
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{"/dev/null", 2, 2},
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{"/dev/zero", 2, 12},
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{"/dev/ttyp0", 5, 0},
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{"/dev/ttyp1", 5, 1},
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{"/dev/random", 45, 0},
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{"/dev/srandom", 45, 1},
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{"/dev/urandom", 45, 2},
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{"/dev/arandom", 45, 3},
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}
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for _, tc := range testCases {
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t.Run(fmt.Sprintf("%s %v:%v", tc.path, tc.major, tc.minor), func(t *testing.T) {
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var stat unix.Stat_t
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err := unix.Stat(tc.path, &stat)
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if err != nil {
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t.Errorf("failed to stat device: %v", err)
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return
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}
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dev := uint64(stat.Rdev)
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if unix.Major(dev) != tc.major {
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t.Errorf("for %s Major(%#x) == %d, want %d", tc.path, dev, unix.Major(dev), tc.major)
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}
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if unix.Minor(dev) != tc.minor {
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t.Errorf("for %s Minor(%#x) == %d, want %d", tc.path, dev, unix.Minor(dev), tc.minor)
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}
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if unix.Mkdev(tc.major, tc.minor) != dev {
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t.Errorf("for %s Mkdev(%d, %d) == %#x, want %#x", tc.path, tc.major, tc.minor, unix.Mkdev(tc.major, tc.minor), dev)
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}
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})
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}
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}
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