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sockcmsg_unix_other.go (1233B)

      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 }