// Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build aix || darwin || freebsd || linux || netbsd || openbsd || solaris package syscall 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 { case "aix": // There is no alignment on AIX. salign = 1 case "darwin", "ios", "illumos", "solaris": // 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 } case "netbsd", "openbsd": // 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) }