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// Copyright 2013 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.
// This file implements sysSocket and accept for platforms that
// provide a fast path for setting SetNonblock and CloseOnExec.
// +build dragonfly freebsd linux netbsd openbsd
package net
import (
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
// introduced in 2.6.27 kernel and on FreeBSD both flags were
// introduced in 10 kernel. If we get an EINVAL error on Linux
// or EPROTONOSUPPORT error on FreeBSD, fall back to using
// socket without them.
switch err {
case nil:
return s, nil
return -1, os.NewSyscallError("socket", err)
case syscall.EPROTONOSUPPORT, syscall.EINVAL:
// See ../syscall/exec_unix.go for description of ForkLock.
s, err = socketFunc(family, sotype, proto)
if err == nil {
if err != nil {
return -1, os.NewSyscallError("socket", err)
if err = syscall.SetNonblock(s, true); err != nil {
return -1, os.NewSyscallError("setnonblock", err)
return s, nil