Source file src/vendor/golang.org/x/net/route/sys.go

     1	// Copyright 2016 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	// +build darwin dragonfly freebsd netbsd openbsd
     6	
     7	package route
     8	
     9	import "unsafe"
    10	
    11	var (
    12		nativeEndian binaryByteOrder
    13		kernelAlign  int
    14		wireFormats  map[int]*wireFormat
    15	)
    16	
    17	func init() {
    18		i := uint32(1)
    19		b := (*[4]byte)(unsafe.Pointer(&i))
    20		if b[0] == 1 {
    21			nativeEndian = littleEndian
    22		} else {
    23			nativeEndian = bigEndian
    24		}
    25		kernelAlign, wireFormats = probeRoutingStack()
    26	}
    27	
    28	func roundup(l int) int {
    29		if l == 0 {
    30			return kernelAlign
    31		}
    32		return (l + kernelAlign - 1) &^ (kernelAlign - 1)
    33	}
    34	
    35	type wireFormat struct {
    36		extOff  int // offset of header extension
    37		bodyOff int // offset of message body
    38		parse   func(RIBType, []byte) (Message, error)
    39	}
    40	

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