golang freebsd 代码
文件路径：/src/runtime/cgo/freebsd.go
/ Copyright 2010 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 freebsd
package cgo
import _ "unsafe" / for go:linkname
/ Supply environ and __progname, because we don't
/ link against the standard FreeBSD crt0.o and the
/ libc dynamic library needs them.
/go:linkname _environ environ
/go:linkname _progname __progname
/go:cgo_export_dynamic environ
/go:cgo_export_dynamic __progname
var _environ uintptr
var _progname uintptr