diff options
Diffstat (limited to 'device/peer_test.go')
-rw-r--r-- | device/peer_test.go | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/device/peer_test.go b/device/peer_test.go new file mode 100644 index 0000000..de87ab6 --- /dev/null +++ b/device/peer_test.go @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved. + */ + +package device + +import ( + "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 + checkAlignment(t, "Peer.stats", unsafe.Offsetof(p.stats)) + checkAlignment(t, "Peer.isRunning", unsafe.Offsetof(p.isRunning)) +} |