57 lines
1.1 KiB
Go
57 lines
1.1 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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// Sockets for Linux
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package net
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import "syscall"
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func maxListenerBacklog() int {
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fd, err := open("/proc/sys/net/core/somaxconn")
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if err != nil {
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return syscall.SOMAXCONN
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}
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defer fd.close()
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l, ok := fd.readLine()
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if !ok {
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return syscall.SOMAXCONN
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}
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f := getFields(l)
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n, _, ok := dtoi(f[0], 0)
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if n == 0 || !ok {
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return syscall.SOMAXCONN
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}
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return n
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}
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func listenerSockaddr(s, f int, la syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (syscall.Sockaddr, error) {
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a := toAddr(la)
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if a == nil {
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return la, nil
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}
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switch v := a.(type) {
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case *TCPAddr, *UnixAddr:
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err := setDefaultListenerSockopts(s)
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if err != nil {
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return nil, err
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}
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case *UDPAddr:
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if v.IP.IsMulticast() {
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err := setDefaultMulticastSockopts(s)
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if err != nil {
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return nil, err
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}
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switch f {
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case syscall.AF_INET:
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v.IP = IPv4zero
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case syscall.AF_INET6:
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v.IP = IPv6unspecified
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}
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return v.sockaddr(f)
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}
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}
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return la, nil
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}
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