golang cgo_bsd 代码
文件路径：/src/net/cgo_bsd.go
/ Copyright 2011 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 cgo && !netgo && (darwin || dragonfly || freebsd)
package net
/*
#include <netdb.h>
*/
import "C"
const cgoAddrInfoFlags = (C.AI_CANONNAME | C.AI_V4MAPPED | C.AI_ALL) & C.AI_MASK