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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 netbsd openbsd
// Sockets for BSD variants
package net
import (
"runtime"
"syscall"
)
func maxListenerBacklog() int {
var (
n uint32
err error
)
switch runtime.GOOS {
case "darwin", "freebsd":
n, err = syscall.SysctlUint32("kern.ipc.somaxconn")
case "netbsd":
// NOTE: NetBSD has no somaxconn-like kernel state so far
case "openbsd":
n, err = syscall.SysctlUint32("kern.somaxconn")
}
if n == 0 || err != nil {
return syscall.SOMAXCONN
}
return int(n)
}
func listenerSockaddr(s, f int, la syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (syscall.Sockaddr, error) {
a := toAddr(la)
if a == nil {
return la, nil
}
switch v := a.(type) {
case *TCPAddr, *UnixAddr:
err := setDefaultListenerSockopts(s)
if err != nil {
return nil, err
}
case *UDPAddr:
if v.IP.IsMulticast() {
err := setDefaultMulticastSockopts(s)
if err != nil {
return nil, err
}
switch f {
case syscall.AF_INET:
v.IP = IPv4zero
case syscall.AF_INET6:
v.IP = IPv6unspecified
}
return v.sockaddr(f)
}
}
return la, nil
}
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