// Copyright 2019 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.// +build darwin dragonfly freebsd linux netbsd openbsdpackageruntime_testimport"syscall"funcfcntl(fduintptr,cmdint,arguintptr)(uintptr,syscall.Errno){res,_,err:=syscall.Syscall(syscall.SYS_FCNTL,fd,uintptr(cmd),arg)returnres,err}