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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.
// Sockets for Linux
package net
import "syscall"
func maxListenerBacklog() int {
fd, err := open("/proc/sys/net/core/somaxconn")
if err != nil {
return syscall.SOMAXCONN
}
defer fd.close()
l, ok := fd.readLine()
if !ok {
return syscall.SOMAXCONN
}
f := getFields(l)
n, _, ok := dtoi(f[0], 0)
if n == 0 || !ok {
return syscall.SOMAXCONN
}
return 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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