EtherGuard-VPN/device/peer_test.go
Josh Bleecher Snyder c4895658e6 device: avoid copying lock in tests
This doesn't cause any practical problems as it is,
but vet (rightly) flags this code as copying a mutex.
It is easy to fix, so do so.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2020-12-08 14:25:10 -08:00

44 lines
1.1 KiB
Go

/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"reflect"
"testing"
"unsafe"
)
func checkAlignment(t *testing.T, name string, offset uintptr) {
t.Helper()
if offset%8 != 0 {
t.Errorf("offset of %q within struct is %d bytes, which does not align to 64-bit word boundaries (missing %d bytes). Atomic operations will crash on 32-bit systems.", name, offset, 8-(offset%8))
}
}
// TestPeerAlignment checks that atomically-accessed fields are
// aligned to 64-bit boundaries, as required by the atomic package.
//
// Unfortunately, violating this rule on 32-bit platforms results in a
// hard segfault at runtime.
func TestPeerAlignment(t *testing.T) {
var p Peer
typ := reflect.TypeOf(&p).Elem()
t.Logf("Peer type size: %d, with fields:", typ.Size())
for i := 0; i < typ.NumField(); i++ {
field := typ.Field(i)
t.Logf("\t%30s\toffset=%3v\t(type size=%3d, align=%d)",
field.Name,
field.Offset,
field.Type.Size(),
field.Type.Align(),
)
}
checkAlignment(t, "Peer.stats", unsafe.Offsetof(p.stats))
checkAlignment(t, "Peer.isRunning", unsafe.Offsetof(p.isRunning))
}