| // 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 *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 |
| } |