75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// Copyright 2009 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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// +build darwin freebsd linux netbsd openbsd windows
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// Sockets
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package net
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import (
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"syscall"
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"time"
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)
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var listenerBacklog = maxListenerBacklog()
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// Generic socket creation.
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func socket(net string, f, t, p int, ipv6only bool, ulsa, ursa syscall.Sockaddr, deadline time.Time, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err error) {
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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 := syscall.Socket(f, t, p)
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if err != nil {
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syscall.ForkLock.RUnlock()
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return nil, err
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}
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syscall.CloseOnExec(s)
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syscall.ForkLock.RUnlock()
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if err = setDefaultSockopts(s, f, t, ipv6only); err != nil {
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closesocket(s)
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return nil, err
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}
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if ulsa != nil {
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// We provide a socket that listens to a wildcard
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// address with reusable UDP port when the given ulsa
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// is an appropriate UDP multicast address prefix.
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// This makes it possible for a single UDP listener
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// to join multiple different group addresses, for
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// multiple UDP listeners that listen on the same UDP
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// port to join the same group address.
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if ulsa, err = listenerSockaddr(s, f, ulsa, toAddr); err != nil {
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closesocket(s)
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return nil, err
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}
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if err = syscall.Bind(s, ulsa); err != nil {
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closesocket(s)
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return nil, err
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}
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}
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if fd, err = newFD(s, f, t, net); err != nil {
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closesocket(s)
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return nil, err
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}
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if ursa != nil {
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fd.wdeadline.setTime(deadline)
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if err = fd.connect(ursa); err != nil {
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closesocket(s)
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return nil, err
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}
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fd.isConnected = true
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fd.wdeadline.set(0)
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}
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lsa, _ := syscall.Getsockname(s)
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laddr := toAddr(lsa)
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rsa, _ := syscall.Getpeername(s)
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raddr := toAddr(rsa)
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fd.setAddr(laddr, raddr)
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return fd, nil
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}
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