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// Copyright 2009 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 freebsd linux netbsd openbsd windows
package net
import (
"syscall"
"time"
)
var listenerBacklog = maxListenerBacklog()
// Generic POSIX socket creation.
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) {
s, err := sysSocket(f, t, p)
if err != nil {
return nil, err
}
if err = setDefaultSockopts(s, f, t, ipv6only); err != nil {
closesocket(s)
return nil, err
}
// This socket is used by a listener.
if ulsa != nil && ursa == nil {
// We provide a socket that listens to a wildcard
// address with reusable UDP port when the given ulsa
// is an appropriate UDP multicast address prefix.
// This makes it possible for a single UDP listener
// to join multiple different group addresses, for
// multiple UDP listeners that listen on the same UDP
// port to join the same group address.
if ulsa, err = listenerSockaddr(s, f, ulsa, toAddr); err != nil {
closesocket(s)
return nil, err
}
}
if ulsa != nil {
if err = syscall.Bind(s, ulsa); err != nil {
closesocket(s)
return nil, err
}
}
if fd, err = newFD(s, f, t, net); err != nil {
closesocket(s)
return nil, err
}
// This socket is used by a dialer.
if ursa != nil {
if !deadline.IsZero() {
setWriteDeadline(fd, deadline)
}
if err = fd.connect(ulsa, ursa); err != nil {
fd.Close()
return nil, err
}
fd.isConnected = true
if !deadline.IsZero() {
setWriteDeadline(fd, time.Time{})
}
}
lsa, _ := syscall.Getsockname(s)
laddr := toAddr(lsa)
rsa, _ := syscall.Getpeername(s)
if rsa == nil {
rsa = ursa
}
raddr := toAddr(rsa)
fd.setAddr(laddr, raddr)
return fd, nil
}
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