golang.org/x/sys@v0.20.1-0.20240517151509-673e0f94c16d/unix/sockcmsg_unix_other.go (about) 1 // Copyright 2019 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 //go:build aix || darwin || freebsd || linux || netbsd || openbsd || solaris || zos 6 7 package unix 8 9 import ( 10 "runtime" 11 ) 12 13 // Round the length of a raw sockaddr up to align it properly. 14 func cmsgAlignOf(salen int) int { 15 salign := SizeofPtr 16 17 // dragonfly needs to check ABI version at runtime, see cmsgAlignOf in 18 // sockcmsg_dragonfly.go 19 switch runtime.GOOS { 20 case "aix": 21 // There is no alignment on AIX. 22 salign = 1 23 case "darwin", "ios", "illumos", "solaris": 24 // NOTE: It seems like 64-bit Darwin, Illumos and Solaris 25 // kernels still require 32-bit aligned access to network 26 // subsystem. 27 if SizeofPtr == 8 { 28 salign = 4 29 } 30 case "netbsd", "openbsd": 31 // NetBSD and OpenBSD armv7 require 64-bit alignment. 32 if runtime.GOARCH == "arm" { 33 salign = 8 34 } 35 // NetBSD aarch64 requires 128-bit alignment. 36 if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm64" { 37 salign = 16 38 } 39 case "zos": 40 // z/OS socket macros use [32-bit] sizeof(int) alignment, 41 // not pointer width. 42 salign = SizeofInt 43 } 44 45 return (salen + salign - 1) & ^(salign - 1) 46 }