Source: sockcmsg_unix_other.go in package golang.org/x/sys/unix

Source File
	sockcmsg_unix_other.go

Belonging Package
	golang.org/x/sys/unix

+build aix darwin freebsd linux netbsd openbsd solaris


package unix

import (
	"runtime"
)

Round the length of a raw sockaddr up to align it properly.

func cmsgAlignOf(salen int) int {
	salign := SizeofPtr

dragonfly needs to check ABI version at runtime, see cmsgAlignOf in sockcmsg_dragonfly.go

	switch runtime.GOOS {

There is no alignment on AIX.

		salign = 1

NOTE: It seems like 64-bit Darwin, Illumos and Solaris kernels still require 32-bit aligned access to network subsystem.

		if SizeofPtr == 8 {
			salign = 4
		}

NetBSD and OpenBSD armv7 require 64-bit alignment.

		if runtime.GOARCH == "arm" {
			salign = 8

NetBSD aarch64 requires 128-bit alignment.

		if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm64" {
			salign = 16
		}
	}

	return (salen + salign - 1) & ^(salign - 1)


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