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3e7259c5e7
Use 32-bit alignment for versions before the September 2019 ABI changes http://lists.dragonflybsd.org/pipermail/users/2019-September/358280.html Follows CL 201977 which did the same for package syscall. Updates golang/go#34958 Change-Id: I0e13fccf6563e4d34dd4aa7410be044881f220aa Reviewed-on: https://go-review.googlesource.com/c/sys/+/202179 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
39 lines
954 B
Go
39 lines
954 B
Go
// Copyright 2019 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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// +build aix darwin freebsd linux netbsd openbsd solaris
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package unix
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import (
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"runtime"
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)
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// Round the length of a raw sockaddr up to align it properly.
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func cmsgAlignOf(salen int) int {
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salign := SizeofPtr
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// dragonfly needs to check ABI version at runtime, see cmsgAlignOf in
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// sockcmsg_dragonfly.go
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switch runtime.GOOS {
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case "aix":
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// There is no alignment on AIX.
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salign = 1
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case "darwin", "illumos", "solaris":
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// NOTE: It seems like 64-bit Darwin, Illumos and Solaris
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// kernels still require 32-bit aligned access to network
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// subsystem.
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if SizeofPtr == 8 {
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salign = 4
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}
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case "netbsd", "openbsd":
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// NetBSD and OpenBSD armv7 require 64-bit alignment.
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if runtime.GOARCH == "arm" {
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salign = 8
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}
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}
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return (salen + salign - 1) & ^(salign - 1)
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}
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