// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file implements sysSocket and accept for platforms that
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// provide a fast path for setting SetNonblock and CloseOnExec.
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// +build dragonfly freebsd linux netbsd openbsd
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package net
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import (
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"internal/poll"
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"os"
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"syscall"
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)
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// Wrapper around the socket system call that marks the returned file
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// descriptor as nonblocking and close-on-exec.
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func sysSocket(family, sotype, proto int) (int, error) {
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s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
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// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
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// introduced in 2.6.27 kernel and on FreeBSD both flags were
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// introduced in 10 kernel. If we get an EINVAL error on Linux
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// or EPROTONOSUPPORT error on FreeBSD, fall back to using
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// socket without them.
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switch err {
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case nil:
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return s, nil
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default:
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return -1, os.NewSyscallError("socket", err)
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case syscall.EPROTONOSUPPORT, syscall.EINVAL:
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}
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// See ../syscall/exec_unix.go for description of ForkLock.
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syscall.ForkLock.RLock()
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s, err = socketFunc(family, sotype, proto)
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if err == nil {
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syscall.CloseOnExec(s)
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}
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syscall.ForkLock.RUnlock()
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if err != nil {
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return -1, os.NewSyscallError("socket", err)
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}
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if err = syscall.SetNonblock(s, true); err != nil {
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poll.CloseFunc(s)
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return -1, os.NewSyscallError("setnonblock", err)
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}
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return s, nil
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}
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